Martinez Weather
Town • San Francisco Bay Area
Martinez, the Contra Costa County seat, sits right on the south shore of the Carquinez Strait where the strait widens into Suisun Bay, facing Benicia across the water. Its compact downtown runs down to the Amtrak station, the city marina, and the Ted and Kathy Radke Martinez Regional Shoreline. The John Muir National Historic Site lies a short drive south on Alhambra Avenue. Of the central Contra Costa cities, it is the only one built directly on the wind gap that feeds the Delta.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Martinez weather today and through the year
It's 55°F at Martinez right now (feels like 52°F), with 6 mph wind and a comfort score of 79. Monday's forecast high at Martinez is 57°F, 8°F below the mid November normal of 65°F. The best window today is 9 AM to noon, at about 54°F with a 7 mph wind (comfort 59).
August is the warmest month at Martinez, with an average high of 84°F. January is the coldest, with an average low of 40°F. December is the wettest month (4.3 in.), out of about 20.9 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Martinez are June, September, and August. The best hours are usually 10 AM to 1 PM in June, 10 AM to 1 PM in September, and 10 AM to 1 PM in August.
The Carquinez Strait is the only sea-level gap between San Francisco Bay and the Central Valley, and Martinez sits on it. When the Central Valley heats up, cool marine air is drawn east through the strait. The Air District notes that strong afternoon gusts are common in this northern part of the county. Downtown and the waterfront feel that wind at full strength, mostly from late afternoon into the evening.
Forecast updated November 15, 2026 at 4:00 AM PST. Climate figures come from NOAA 1991-2020 normals. Hourly patterns come from NOAA's HRRR hourly analysis from September 2014 to April 2026.
What to expect at Martinez in the next few days
No active National Weather Service alerts for this location.
Best time to go
The best window today is 9 AM to noon, at about 54°F with a 7 mph wind (comfort 59).
Best day this week
Of the next 7 days, Friday looks best for Martinez, with a 62°F high and midday comfort near 81. Today looks weakest (55).
Rain
Next good chance of rain: today (71%, about 0.21 in.).
Live weather map
Weather around Martinez right now
Overcast and 55° at Martinez right now.
About the live weather map for Martinez
The map centers on Martinez and stacks fog, satellite clouds, and precipitation radar on one view. Clouds come from the GOES-West satellite and rain from NOAA radar, and both show current conditions. Fog comes from our HRRR-based fog model, and the slider steps through its forecast for the next 12 hours.
Dots mark nearby places with their current temperature, colored by comfort score. Use the layer buttons to turn any layer off, or open the full map for every destination in the region.
Nearby Temperature Comparison
Conditions at nearby San Francisco Bay Area destinations
Tip: Bay Area temperatures can change by 20 to 30°F over a short distance because of microclimates.
Martinez vs nearby places
Typical summer conditions compared with Martinez, from the same NOAA HRRR hourly record. The list shows the closest places, then nearby places whose climate differs the most.
| Place | Distance | Summer afternoons | Morning fog | Afternoon wind | Compared with Martinez |
|---|---|---|---|---|---|
| Benicia | 2.5 mi | +1°F | 11% | 12 mph | a very similar climate |
| Alhambra Valley | 3.5 mi | same | 14% | 11 mph | a very similar climate |
| Briones Regional Park | 6.1 mi | -4°F | 23% | 11 mph | about 33% more rain a year and more summer morning fog (23% vs 10% of morning hours) |
| Crissy Field | 23.3 mi | -24°F | 40% | 18 mph | about 24°F cooler on summer afternoons and more summer morning fog (40% vs 10% of morning hours) |
| Presidio of San Francisco | 23.7 mi | -24°F | 40% | 18 mph | about 24°F cooler on summer afternoons and more summer morning fog (40% vs 10% of morning hours) |
| Baker Beach | 24.6 mi | -24°F | 45% | 16 mph | about 24°F cooler on summer afternoons and more summer morning fog (45% vs 10% of morning hours) |
Places with a climate like Martinez's
- Willow Glen (51 mi away): nearly the same temperatures every month
- Santa Clara (47 mi away): nearly the same temperatures every month
- Dublin (24 mi away): nearly the same temperatures every month
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Martinez climate comparisons mean
These cards compare recent conditions at Martinez with the available local baseline. Temperature and year-to-date rainfall use long-term normals when available. Fog, sunshine, wind, and comfort use the matching recent or modeled baseline identified on each card.
Positive and negative differences describe how Martinez departs from its own usual pattern. They should not be read as a direct comparison with another city or as a forecast beyond the period shown.
Martinez weather by month
August is the warmest month at Martinez, with an average high of 84°F. January is the coldest, with an average low of 40°F. December is the wettest month (4.3 in.), out of about 20.9 in. a year. Morning fog peaks in December, when fog or low cloud covers 27% of the hours from 6 to 10 AM. July has the clearest middays, with clouds covering about 6% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Martinez are June, September, and August. The best hours are usually 10 AM to 1 PM in June, 10 AM to 1 PM in September, and 10 AM to 1 PM in August.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 56°F | 40°F | 4.1 in | 8 | 22% | 36% | 6 mph | 9.8 h | 55 |
| Feb | 61°F | 42°F | 4.2 in | 8 | 10% | 25% | 8 mph | 10.7 h | 62 |
| Mar | 65°F | 44°F | 3.0 in | 7 | 5% | 27% | 9 mph | 11.9 h | 68 |
| Apr | 69°F | 46°F | 1.4 in | 5 | 4% | 20% | 10 mph | 13.2 h | 78 |
| May | 75°F | 50°F | 0.6 in | 3 | 7% | 16% | 12 mph | 14.2 h | 79 |
| Jun | 81°F | 54°F | 0.1 in | 2 | 9% | 6% | 12 mph | 14.8 h | 86 |
| Jul | 84°F | 55°F | 0.0 in | 0 | 14% | 6% | 12 mph | 14.5 h | 83 |
| Aug | 84°F | 56°F | 0.0 in | 1 | 8% | 7% | 12 mph | 13.6 h | 84 |
| Sep | 82°F | 54°F | 0.1 in | 1 | 7% | 10% | 10 mph | 12.3 h | 86 |
| Oct | 76°F | 50°F | 0.9 in | 4 | 6% | 14% | 8 mph | 11.1 h | 84 |
| Nov | 65°F | 44°F | 2.0 in | 6 | 11% | 24% | 7 mph | 10.0 h | 76 |
| Dec | 57°F | 40°F | 4.3 in | 9 | 27% | 40% | 6 mph | 9.5 h | 53 |
Morning fog is the share of hours from 6 to 10 AM with fog or low cloud. Midday cloud is the average from 11 AM to 3 PM, and afternoon wind is the average from 1 to 5 PM. The highlighted rows are the most comfortable months.
What makes Martinez's weather different
When the fog burns off
28%of 9 AM hours foggy in December
Fog or low cloud covers Martinez in 28% of 9 AM hours in December, the foggiest month. It thins slowly and often lasts into the early afternoon. April mornings are the least foggy (4%).
When the wind picks up
3 PMwhen afternoon wind builds, March–October
From March through October, wind at Martinez typically builds after 3 PM. In June it peaks around 6 PM, averaging 15 mph with 47% of those hours windy, while mornings average 10 mph.
Elevation
−4°Fsummer afternoons at Briones Regional Park, 1,015 ft up
Briones Regional Park sits 1,015 ft higher, 6.1 miles away. Its summer highs average 4°F cooler and its winter lows 1°F milder than Martinez.
Daylight
9.5–14.8 hof daylight, Dec to Jun
Days at Martinez range from about 9.5 hours in December to 14.8 hours in June. In mid-June the sun sets around 8:33 PM, and in mid-December around 4:54 PM.
Seasons at Martinez
- Warm seasonJun 28 – Sep 23 · highs 82°F+
The warm season lasts about 2.9 months, from Jun 28 to Sep 23, when the average high is 82°F or warmer. Highs peak around Aug 8 at about 84°F.
- Cool seasonNov 27 – Feb 27 · highs 63°F or lower
The cool season runs from Nov 27 to Feb 27, when the average high is 63°F or lower. The coldest nights come around Jan 8, with an average low near 40°F.
- Rainy seasonNov 19 – Mar 31 · 79% of the year's rain
The rainy season runs from Nov 19 to Mar 31, when a day has at least a 20% chance of measurable rain. That stretch brings 79% of the year's rain.
The dark line marks today. Season dates come from the smoothed daily NOAA 1991-2020 normals. Counting from Oct. 1, a typical year has its first inch of rain by Nov 1 and half of its annual total by Jan 25.
Days per year and extremes (Nov 1, 2024 to Oct 31, 2026)
This record runs from Nov 1, 2024 to Oct 31, 2026. Over this record, Martinez averaged 25 days a year at 90°F or hotter and no freezing nights. It averaged 14 days a year with at least half an inch of rain and 4 afternoons with wind of 20 mph or more at 2 PM. About 73 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Sep 9, 2026 (99°F) and the coldest night was Feb 10, 2025 (34°F). The wettest day was Nov 23, 2024 (2.26 in.), and the strongest 2 PM gust was 41 mph on Feb 13, 2025.
- 25days at 90°F or hotter
- 0nights at or below freezing
- 14days with ½ in. of rain or more
- 4afternoons with 20+ mph wind
- 73mornings with 3+ hours of fog or low cloud
- Hottest day99°FSep 9, 2026
- Coldest night34°FFeb 10, 2025
- Wettest day2.26 inNov 23, 2024
- Strongest 2 PM gust41 mphFeb 13, 2025
What shapes Martinez's weather
Being on the water keeps Martinez more temperate than Concord or Pleasant Hill, which sit behind hills a few miles south. Summer afternoons on the shoreline are usually a few degrees cooler and breezier, and winter nights rarely get as cold as on the valley floor. The hill neighborhoods and the Alhambra Valley just south of downtown are more sheltered and heat up faster.
The westerly flow of sea air through the Carquinez Strait sometimes reverses. When east winds set up, air from the Central Valley pushes west past Martinez instead, which can bring haze in summer and fine-particle pollution in winter. On calm winter nights, fog that forms over the marshes and Suisun Bay can settle along the waterfront until late morning or longer.
Tips for visiting Martinez
Arrive by train
The Amtrak station at 601 Marina Vista Avenue is about a three-minute walk from downtown and the waterfront park. The main lot often fills by about 8 a.m.
Bring a windbreaker to the waterfront
Strong afternoon gusts are common along the Carquinez Strait, even on hot days inland.
Leave dogs out of the marsh
At the Radke Martinez Regional Shoreline, dogs are not allowed in the marsh or duck pond areas and must be leashed in parking areas.
Climb Franklin Ridge for the view
Carquinez Strait Regional Shoreline's ridge trails look west to Mount Tamalpais and east to Mount Diablo. Carquinez Scenic Drive has no through traffic.
Visit John Muir's home Tuesday to Saturday
The John Muir National Historic Site is open Tuesday through Saturday, 10 a.m. to 5 p.m., and closed Sundays and Mondays.
Martinez through the seasons
- Spring (March–May)
- The hills above the strait are green, and the afternoon west wind starts building again as inland valleys warm.
- Summer (June–August)
- Summer brings warm, breezy afternoons on the waterfront, with marine air pushing through the strait almost every day.
- Fall (September–October)
- The wind usually eases, so a warm September day can feel as hot on the shore as midsummer. Prevailing west winds can occasionally reverse to east winds that carry Central Valley haze.
- Winter (November–February)
- Winter is the rainy season, with mild days and foggy mornings, especially in December and January. Fine-particle pollution can drift west through the strait from the Central Valley on calm days.
Activities and the weather that matters
- Boating from the marina: Mornings are calmer. Afternoon westerlies through the strait can kick up chop, especially in summer.
- Shoreline walks and birding: The shoreline is good year-round. Fog can sit over the marsh on winter mornings, and summer afternoons are windy.
- Hiking Franklin Ridge: The views are clearest after winter storms and in spring. The ridge is exposed and hot on summer afternoons, away from the water's cooling.
Official sources and current conditions
- East Bay Regional Park District: Radke Martinez Regional Shoreline
- NPS: John Muir National Historic Site
- Capitol Corridor: Martinez station
- East Bay Regional Park District: Carquinez Strait Regional Shoreline
Numbers on this page come from NOAA data. The text draws on the official sources linked above.
Historical Climate Data
Long-term weather patterns and climate data
Data sources: Recent temperatures come from NOAA URMA and recent precipitation from NOAA Stage IV. Fog, cloud, wind, humidity, and sunshine come from NOAA HRRR, and long-term baselines from NOAA 1991-2020 climate normals.
Climate Overview
Based on NOAA 30-year temperature/rain normals (1991-2020) with recent fog/sun baseline
🌟 Best Months to Visit
⚠️ Challenging Months
Monthly Breakdown
| Month | Comfort | High/Low | ☀️ Sun | 🌫️ Fog | 💧 Rain | Perfect |
|---|---|---|---|---|---|---|
| November 2024 | 81 | 62.8° / 46.9° | 6.4h | 2d | 3.62" | 19 |
| December 2024 | 67 | 57.3° / 45.7° | 4.1h | 11d | 5.08" | 9 |
| January 2025 | 82 | 59° / 41.6° | 6.8h | 5d | 0.14" | 22 |
| February 2025 | 78 | 61.2° / 44.6° | 6.9h | 4d | 6.6" | 19 |
| March 2025 | 85 | 62.8° / 46.4° | 8.7h | 0d | 2.01" | 23 |
| April 2025 | 93 | 69.1° / 49.5° | 10h | 0d | 0.2" | 28 |
| May 2025 | 94 | 76.6° / 53.7° | 12.4h | 2d | 0.14" | 31 |
| June 2025 | 93 | 77.9° / 54.7° | 12.8h | 3d | 0" | 30 |
| July 2025 | 91 | 77.8° / 56.6° | 12.3h | 7d | 0" | 31 |
| August 2025 | 91 | 85.6° / 59.4° | 11.5h | 1d | 0" | 31 |
| September 2025 | 91 | 81.3° / 61.3° | 9.8h | 1d | 0.12" | 28 |
| October 2025 | 89 | 72.9° / 54.5° | 8.1h | 4d | 1.54" | 29 |
| November 2025 | 77 | 63.3° / 50.7° | 5.3h | 10d | 1.94" | 17 |
| December 2025 | 57 | 53.5° / 45.4° | 2.4h | 22d | 4.21" | 3 |
| January 2026 | 70 | 58.2° / 44.4° | 5.9h | 16d | 3.44" | 8 |
| February 2026 | 77 | 63.6° / 46.6° | 6.5h | 7d | 3.81" | 16 |
| March 2026 | 94 | 77.5° / 52.9° | 9.7h | 0d | 0.02" | 30 |
| April 2026 | 88 | 68.9° / 50.6° | 9.4h | 1d | 3.48" | 23 |
| May 2026 | 92 | 74.2° / 54.1° | 11.8h | 2d | 0.66" | 30 |
| June 2026 | 91 | 79° / 57.1° | 12.6h | 5d | 0" | 28 |
| July 2026 | 92 | 82.9° / 58.9° | 11.7h | 3d | 0.01" | 31 |
| August 2026 | 92 | 83.3° / 58.7° | 11.2h | 0d | 0" | 31 |
| September 2026 | 93 | 80.4° / 58° | 10.4h | 0d | 0.39" | 29 |
| October 2026 | 90 | 77.9° / 54.6° | 8.3h | 1d | 0.46" | 29 |
Climate Trends
Average Temperature by Month
About the Martinez climate charts
The temperature chart compares average monthly highs and lows at Martinez, showing both the seasonal cycle and the typical day-to-night range. The comfort chart summarizes how often the combined weather pattern is favorable rather than judging temperature alone.
Precipitation shows the total recorded or modeled rainfall for each month at Martinez. Sunshine compares average bright-sky hours with the daylight available, while fog shows the average number of morning fog or low-cloud hours per day. Switch between the chart tabs to compare the same months across each measure.
Hourly Temperature, Fog, Wind, Cloud Cover, and Solar Radiation Patterns
Average local hour by month from 2014-09-30 to 2026-04-30
- Temperature: At Martinez, the warmest typical hour is 3 PM in August (84°F). The coldest is 7 AM in December (44°F).
- Fog: Fog or low cloud covers Martinez in 28% of 9 AM hours in December, the foggiest month. It thins slowly and often lasts into the early afternoon. April mornings are the least foggy (4%).
- Wind: From March through October, wind at Martinez typically builds after 3 PM. In June it peaks around 6 PM, averaging 15 mph with 47% of those hours windy, while mornings average 10 mph.
- Cloud Cover: July middays are the clearest at Martinez (6% average cloud cover), and December middays are the cloudiest (40%).
- Solar Radiation: The strongest typical sun at Martinez comes at 1 PM in June, averaging 998 W/m².
How to read the hourly heatmaps for Martinez
This heatmap shows how average temperature at Martinez changes by hour and month. Read left to right for the seasons and top to bottom for the time of day. Warmer colors mark the usual afternoon peaks, and cooler colors show overnight and winter lows.
This heatmap shows when fog or low cloud is most likely at Martinez. Darker cells mark the months and hours when fog has been most common. They help separate overnight or morning fog from cloud that tends to linger into the afternoon.
This heatmap shows the typical hourly wind pattern at Martinez through the year. It makes recurring afternoon wind, calmer overnight periods, and seasonal changes easier to compare than a single daily wind value.
This heatmap shows average cloud cover at Martinez for every month and hour. Use it to see whether cloudiness is mainly an overnight and morning pattern or commonly persists during the part of the day you plan to visit.
This heatmap shows the average solar radiation reaching Martinez by month and hour. Brighter cells indicate the strongest typical sun, while muted cells can reflect nighttime, shorter winter days, cloud cover, smoke, or terrain shading.
Each cell combines one month with one local hour. Hover over or focus on a cell for its value and sample coverage. The red marker shows the current month and hour.
How recent months compared at Martinez
- October 2026 recap: October 2026 at Martinez averaged a high of 78°F, 5°F warmer than October 2025 (73°F).
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 19.5 in. of rain to Martinez, 93% of the 20.9 in. normal.
Location Details
Martinez weather questions
Everything you need to know about weather and visiting Martinez
What is the weather like at Martinez today?
It's 55°F at Martinez right now, with a comfort score of 79 (great). Monday's forecast high at Martinez is 57°F, 8°F below the mid November normal of 65°F. The best window today is 9 AM to noon, at about 54°F with a 7 mph wind (comfort 59).
What is the best month to visit Martinez?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Martinez are June, September, and August. The best hours are usually 10 AM to 1 PM in June, 10 AM to 1 PM in September, and 10 AM to 1 PM in August. The warm season lasts about 2.9 months, from Jun 28 to Sep 23, when the average high is 82°F or warmer. Highs peak around Aug 8 at about 84°F.
What are the warmest and coldest months at Martinez?
August is the warmest month at Martinez, with an average high of 84°F. January is the coldest, with an average low of 40°F.
When does the fog burn off at Martinez?
Fog or low cloud covers Martinez in 28% of 9 AM hours in December, the foggiest month. It thins slowly and often lasts into the early afternoon. April mornings are the least foggy (4%).
When is it windiest at Martinez?
From March through October, wind at Martinez typically builds after 3 PM. In June it peaks around 6 PM, averaging 15 mph with 47% of those hours windy, while mornings average 10 mph.
How much rain does Martinez get?
December is the wettest month (4.3 in.), out of about 20.9 in. a year. The rainy season runs from Nov 19 to Mar 31, when a day has at least a 20% chance of measurable rain. That stretch brings 79% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 19.5 in. of rain to Martinez, 93% of the 20.9 in. normal.
How does Martinez weather compare with Briones Regional Park?
Briones Regional Park sits 1,015 ft higher, 6.1 miles away. Its summer highs average 4°F cooler and its winter lows 1°F milder than Martinez.
What kind of place is Martinez?
Martinez, the Contra Costa County seat, sits right on the south shore of the Carquinez Strait where the strait widens into Suisun Bay, facing Benicia across the water. Its compact downtown runs down to the Amtrak station, the city marina, and the Ted and Kathy Radke Martinez Regional Shoreline. The John Muir National Historic Site lies a short drive south on Alhambra Avenue. Of the central Contra Costa cities, it is the only one built directly on the wind gap that feeds the Delta.
What is Martinez weather like in November?
November at Martinez averages a high of 65°F and a low of 44°F, with 2.0 in. of rain over about 6 rainy days. About 11% of morning hours are foggy. Afternoon wind averages 7 mph.
More about Martinez weather
Guides that explain the weather here and nearby
Data sources and methods
- Monthly temperatures and precipitation: NOAA 1991-2020 normals.
- Fog, cloud, wind, sun, and comfort by hour and month: NOAA's HRRR hourly analysis from September 2014 to April 2026.
- Daily records and recent months: NOAA URMA and HRRR analyses, plus NOAA Stage IV precipitation.
- Nearby comparisons and regional rankings use the same hourly HRRR summaries for every destination in the region.
- Alerts: National Weather Service. Tides and ocean temperature: NOAA CO-OPS, where shown.
- All statements on this page are computed from these datasets, apart from the “What shapes the weather” guide, which cites its sources inline.
- Bay Area Air Quality Management District, Contra Costa County community page (updated Apr 21, 2017) (accessed 2026-10-27)
- California State Lands Commission, Georgia Pacific Gypsum Antioch Wharf Upgrade Project MND, Section 3.3 Air Quality (Aug 2015) (accessed 2026-10-27)
- Capitol Corridor, Martinez (MTZ) station (accessed 2026-10-27)
- East Bay Regional Park District, Ted and Kathy Radke Martinez Regional Shoreline (accessed 2026-10-27)
- East Bay Regional Park District, Carquinez Strait Regional Shoreline (accessed 2026-10-27)
- National Park Service, John Muir National Historic Site basic information (accessed 2026-10-27)
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