Antioch Weather
Town • San Francisco Bay Area
Antioch stretches south from the San Joaquin River up into the grassy foothills on the north side of Mount Diablo. Its shoreline sits near where the San Joaquin meets the Sacramento River at the western edge of the Delta. Its old Rivertown district sits on the river, while newer neighborhoods spread toward Contra Loma Regional Park and Black Diamond Mines on the city's southern edge. BART ends here, and the city is the gateway to East County. There the Bay Area's cool marine air runs thin and the Central Valley's summer heat takes over.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Antioch weather today and through the year
It's 53°F at Antioch right now (feels like 51°F), with 5 mph wind and a comfort score of 77. Monday's forecast high at Antioch is 57°F, 8°F below the mid November normal of 65°F. The best window today is 9 AM to noon, at about 55°F with a 7 mph wind (comfort 64).
July is the warmest month at Antioch, with an average high of 90°F. December is the coldest, with an average low of 39°F. January is the wettest month (3.1 in.), out of about 14.5 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Antioch are May, September, and October. The best hours are usually 10 AM to 1 PM in May, 9 AM to noon in September, and 11 AM to 2 PM in October.
Antioch lies at the inland end of the Carquinez Strait wind corridor, where the usual summer and fall wind blows from the west. By the time that ocean air has crossed the strait and Suisun Bay and reached Antioch, it has warmed considerably. The regional air district notes that summer afternoons in eastern Contra Costa often approach triple digits, much hotter than Martinez or Benicia.
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 Antioch 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 55°F with a 7 mph wind (comfort 64).
Best day this week
Of the next 7 days, Friday looks best for Antioch, with a 62°F high and midday comfort near 80. Wednesday looks weakest (32).
Rain
Next good chance of rain: today (83%, about 0.05 in.).
Live weather map
Weather around Antioch right now
Overcast and 53° at Antioch right now.
About the live weather map for Antioch
The map centers on Antioch 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.
Antioch vs nearby places
Typical summer conditions compared with Antioch, 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 Antioch |
|---|---|---|---|---|---|
| Black Diamond Mines Regional Preserve | 4.5 mi | -5°F | 2% | 14 mph | about 5°F cooler on summer afternoons and windier summer afternoons (14 vs 10 mph) |
| Pittsburg | 4.6 mi | -1°F | 2% | 10 mph | a very similar climate |
| Brentwood | 7.8 mi | +3°F | 0% | 8 mph | a very similar climate |
| Moraga | 21.2 mi | -10°F | 43% | 9 mph | more summer morning fog (43% vs 1% of morning hours) and about 88% more rain a year |
| Redwood Regional Park | 23.6 mi | -18°F | 53% | 10 mph | more summer morning fog (53% vs 1% of morning hours) and about 18°F cooler on summer afternoons |
| Grizzly Peak | 24.8 mi | -19°F | 49% | 10 mph | more summer morning fog (49% vs 1% of morning hours) and about 19°F cooler on summer afternoons |
Places with a climate like Antioch's
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Antioch climate comparisons mean
These cards compare recent conditions at Antioch 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 Antioch 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.
Antioch weather by month
July is the warmest month at Antioch, with an average high of 90°F. December is the coldest, with an average low of 39°F. January is the wettest month (3.1 in.), out of about 14.5 in. a year. Morning fog peaks in December, when fog or low cloud covers 24% of the hours from 6 to 10 AM. July has the clearest middays, with clouds covering about 3% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Antioch are May, September, and October. The best hours are usually 10 AM to 1 PM in May, 9 AM to noon in September, and 11 AM to 2 PM in October.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 56°F | 40°F | 3.1 in | 7 | 21% | 34% | 6 mph | 9.8 h | 57 |
| Feb | 62°F | 43°F | 2.6 in | 7 | 8% | 23% | 7 mph | 10.7 h | 63 |
| Mar | 67°F | 45°F | 2.2 in | 6 | 4% | 26% | 8 mph | 11.9 h | 71 |
| Apr | 72°F | 48°F | 1.0 in | 4 | 2% | 18% | 9 mph | 13.2 h | 82 |
| May | 79°F | 52°F | 0.5 in | 3 | 1% | 12% | 10 mph | 14.2 h | 86 |
| Jun | 86°F | 57°F | 0.1 in | 2 | 1% | 4% | 10 mph | 14.8 h | 83 |
| Jul | 90°F | 59°F | 0.0 in | 0 | 2% | 3% | 11 mph | 14.5 h | 79 |
| Aug | 90°F | 58°F | 0.0 in | 1 | 1% | 3% | 10 mph | 13.6 h | 80 |
| Sep | 87°F | 56°F | 0.1 in | 1 | 1% | 7% | 8 mph | 12.3 h | 85 |
| Oct | 78°F | 52°F | 0.7 in | 3 | 2% | 11% | 7 mph | 11.1 h | 85 |
| Nov | 65°F | 45°F | 1.5 in | 5 | 9% | 22% | 5 mph | 10.0 h | 77 |
| Dec | 57°F | 39°F | 2.7 in | 7 | 24% | 37% | 5 mph | 9.5 h | 54 |
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 Antioch's weather different
When the fog burns off
2 PMwhen December fog usually thins (28% foggy at 8 AM)
Fog or low cloud covers Antioch in 28% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 2 PM. June mornings are the least foggy (1%).
When the wind picks up
1 PMwhen afternoon wind builds, March–September
From March through September, wind at Antioch typically builds after 1 PM. In May it peaks around 6 PM, averaging 12 mph with 10% of those hours windy, while mornings average 7 mph.
Hot hours
6 habove 85°F on a typical July afternoon
In July, the average temperature stays at or above 85°F for 6 hours a day.
Microclimate
−5°FBlack Diamond Mines Regional Preserve, 4.5 mi away, on summer afternoons
Black Diamond Mines Regional Preserve, 4.5 miles away, runs about 5°F cooler than Antioch on summer afternoons.
Daylight
9.5–14.8 hof daylight, Dec to Jun
Days at Antioch range from about 9.5 hours in December to 14.8 hours in June. In mid-June the sun sets around 8:31 PM, and in mid-December around 4:52 PM.
Seasons at Antioch
- Warm seasonJun 25 – Sep 24 · highs 86°F+
The warm season lasts about 3 months, from Jun 25 to Sep 24, when the average high is 86°F or warmer. Highs peak around Jul 8 at about 90°F.
- Hot afternoonsJun 7 – Sep 25 · highs 85°F+
Average highs reach 85°F or more from Jun 7 to Sep 25.
- Cool seasonNov 26 – Feb 27 · highs 64°F or lower
The cool season runs from Nov 26 to Feb 27, when the average high is 64°F or lower. The coldest nights come around Dec 8, with an average low near 39°F.
- Rainy seasonDec 4 – Mar 16 · 64% of the year's rain
The rainy season runs from Dec 4 to Mar 16, when a day has at least a 20% chance of measurable rain. That stretch brings 64% 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 7 and half of its annual total by Jan 24.
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, Antioch averaged 45 days a year at 90°F or hotter and no freezing nights. It averaged 8 days a year with at least half an inch of rain and 1 afternoon with wind of 20 mph or more at 2 PM. About 45 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Aug 3, 2026 (101°F) and the coldest night was Jan 21, 2025 (35°F). The wettest day was Feb 18, 2026 (1.32 in.), and the strongest 2 PM gust was 40 mph on Dec 14, 2024.
- 45days at 90°F or hotter
- 0nights at or below freezing
- 8days with ½ in. of rain or more
- 1afternoon with 20+ mph wind
- 45mornings with 3+ hours of fog or low cloud
- Hottest day101°FAug 3, 2026
- Coldest night35°FJan 21, 2025
- Wettest day1.32 inFeb 18, 2026
- Strongest 2 PM gust40 mphDec 14, 2024
What shapes Antioch's weather
Antioch's relief from summer heat usually comes late in the day. On hot days the pressure difference between the ocean and the Central Valley strengthens through the afternoon, and a west wind off the river picks up toward evening. Neighborhoods along the river and the flats north of Highway 4 tend to feel it first. The southern neighborhoods near Contra Loma, farther from the river, feel it later.
Sometimes the flow reverses and east winds bring Central Valley air, which carries more pollution than the clean west wind. In winter that can mean haze from fine soot and dust particles. On calm winter nights, tule fog, a thick ground fog that forms over the cold, damp Delta, can settle over the riverfront and lower parts of town.
Tips for visiting Antioch
Don't plan on swimming at Contra Loma
The Contra Loma swim lagoon has closed for long stretches over water quality and maintenance problems, so check the park page before planning a swim. The 80-acre reservoir is open year-round for fishing, hiking, and biking.
Ride BART to the end of the line
Antioch Station, at 1600 Slatten Ranch Road, is the eastern terminal of BART's yellow line and is served by Tri Delta Transit buses.
Save outdoor plans for morning on hot days
Summer afternoons in eastern Contra Costa frequently approach triple digits and push ozone above health standards.
Book a mine tour at Black Diamond
The Coal Mine Experience at Black Diamond Mines runs on weekends year-round, and advance reservations are highly recommended.
Antioch through the seasons
- Spring (March–May)
- The foothills south of town are green and full of wildflowers, and days are warm without the summer heat.
- Summer (June–August)
- Summer brings hot afternoons and high-ozone days, with a west breeze off the river that usually builds by evening.
- Fall (September–October)
- West winds still prevail through fall, but occasionally the flow reverses and east winds carry more polluted Central Valley air.
- Winter (November–February)
- Winter is cool and damp, with tule fog on calm nights and particle pollution that can drift west from the Central Valley.
Activities and the weather that matters
- Fishing at Contra Loma Reservoir: Fishing is open year round, and calm early mornings are best. Summer afternoons are hot and breezy. A district fishing permit is required.
- Hiking the foothills south of town: Hike from late fall through spring. Grassland trails have little shade in summer heat.
- Riverfront walks in Rivertown: Evenings are the pleasant time in summer, once the west wind arrives off the river.
Official sources and current conditions
- East Bay Regional Park District: Contra Loma Regional Park
- BART: Antioch Station
- East Bay Regional Park District: Alerts and closures
- Bay Area Air Quality Management District: Contra Costa County
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 | 83 | 63.3° / 47° | 6.2h | 1d | 1.33" | 22 |
| December 2024 | 72 | 58° / 45.3° | 4.3h | 10d | 2.64" | 11 |
| January 2025 | 84 | 59.5° / 41.1° | 6.9h | 1d | 0.05" | 23 |
| February 2025 | 81 | 62.2° / 46.3° | 6.9h | 2d | 3.42" | 18 |
| March 2025 | 89 | 64.5° / 48° | 8.6h | 0d | 0.8" | 25 |
| April 2025 | 94 | 71.9° / 52.2° | 10h | 0d | 0.37" | 28 |
| May 2025 | 94 | 80.1° / 57.9° | 12.5h | 0d | 0.14" | 30 |
| June 2025 | 93 | 84.3° / 60.4° | 12.9h | 0d | 0" | 30 |
| July 2025 | 93 | 84.8° / 60.7° | 12.5h | 0d | 0" | 31 |
| August 2025 | 91 | 90.3° / 64.7° | 11.5h | 0d | 0" | 29 |
| September 2025 | 91 | 84.8° / 64.7° | 9.8h | 0d | 0.12" | 27 |
| October 2025 | 91 | 73.9° / 56.2° | 8h | 1d | 1.39" | 27 |
| November 2025 | 77 | 63.3° / 50.6° | 5.4h | 10d | 1.96" | 17 |
| December 2025 | 59 | 52.6° / 44.7° | 3.2h | 18d | 2.08" | 3 |
| January 2026 | 72 | 57.5° / 42.4° | 6h | 16d | 2.3" | 11 |
| February 2026 | 80 | 63.6° / 46.2° | 6.6h | 6d | 3.32" | 18 |
| March 2026 | 95 | 78.3° / 56° | 9.8h | 0d | 0" | 31 |
| April 2026 | 89 | 71° / 52.6° | 9.1h | 0d | 2.4" | 25 |
| May 2026 | 94 | 77.9° / 57.3° | 11.8h | 0d | 0.29" | 31 |
| June 2026 | 93 | 84.9° / 61.7° | 12.7h | 0d | 0" | 29 |
| July 2026 | 91 | 88.4° / 63.9° | 12.2h | 0d | 0" | 29 |
| August 2026 | 91 | 88.6° / 63.3° | 11.2h | 0d | 0" | 29 |
| September 2026 | 93 | 83.3° / 61.2° | 10.4h | 0d | 0.01" | 28 |
| October 2026 | 90 | 79.1° / 57.4° | 8.3h | 2d | 0.38" | 29 |
Climate Trends
Average Temperature by Month
About the Antioch climate charts
The temperature chart compares average monthly highs and lows at Antioch, 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 Antioch. 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 Antioch, the warmest typical hour is 4 PM in July (90°F). The coldest is 7 AM in January (44°F).
- Fog: Fog or low cloud covers Antioch in 28% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 2 PM. June mornings are the least foggy (1%).
- Wind: From March through September, wind at Antioch typically builds after 1 PM. In May it peaks around 6 PM, averaging 12 mph with 10% of those hours windy, while mornings average 7 mph.
- Cloud Cover: July middays are the clearest at Antioch (3% average cloud cover), and December middays are the cloudiest (37%).
- Solar Radiation: The strongest typical sun at Antioch comes at 1 PM in June, averaging 986 W/m².
How to read the hourly heatmaps for Antioch
This heatmap shows how average temperature at Antioch 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 Antioch. 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 Antioch 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 Antioch 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 Antioch 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 Antioch
- October 2026 recap: October 2026 at Antioch averaged a high of 79°F, 5°F warmer than October 2025 (74°F).
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 13.7 in. of rain to Antioch, 95% of the 14.5 in. normal.
Location Details
Antioch weather questions
Everything you need to know about weather and visiting Antioch
What is the weather like at Antioch today?
It's 53°F at Antioch right now, with a comfort score of 77 (great). Monday's forecast high at Antioch is 57°F, 8°F below the mid November normal of 65°F. The best window today is 9 AM to noon, at about 55°F with a 7 mph wind (comfort 64).
What is the best month to visit Antioch?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Antioch are May, September, and October. The best hours are usually 10 AM to 1 PM in May, 9 AM to noon in September, and 11 AM to 2 PM in October. The warm season lasts about 3 months, from Jun 25 to Sep 24, when the average high is 86°F or warmer. Highs peak around Jul 8 at about 90°F.
What are the warmest and coldest months at Antioch?
July is the warmest month at Antioch, with an average high of 90°F. December is the coldest, with an average low of 39°F.
When does the fog burn off at Antioch?
Fog or low cloud covers Antioch in 28% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 2 PM. June mornings are the least foggy (1%).
When is it windiest at Antioch?
From March through September, wind at Antioch typically builds after 1 PM. In May it peaks around 6 PM, averaging 12 mph with 10% of those hours windy, while mornings average 7 mph.
How much rain does Antioch get?
January is the wettest month (3.1 in.), out of about 14.5 in. a year. The rainy season runs from Dec 4 to Mar 16, when a day has at least a 20% chance of measurable rain. That stretch brings 64% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 13.7 in. of rain to Antioch, 95% of the 14.5 in. normal.
How does Antioch weather compare with Black Diamond Mines Regional Preserve?
Black Diamond Mines Regional Preserve, 4.5 miles away, runs about 5°F cooler than Antioch on summer afternoons.
What kind of place is Antioch?
Antioch stretches south from the San Joaquin River up into the grassy foothills on the north side of Mount Diablo. Its shoreline sits near where the San Joaquin meets the Sacramento River at the western edge of the Delta. Its old Rivertown district sits on the river, while newer neighborhoods spread toward Contra Loma Regional Park and Black Diamond Mines on the city's southern edge. BART ends here, and the city is the gateway to East County. There the Bay Area's cool marine air runs thin and the Central Valley's summer heat takes over.
What is Antioch weather like in November?
November at Antioch averages a high of 65°F and a low of 45°F, with 1.5 in. of rain over about 5 rainy days. Afternoon wind averages 5 mph.
More about Antioch weather
Guides that explain the weather here and nearby
- What Is Tule Fog? California's Densest Fog Explained
- What Is the Delta Breeze? The Cool Air Current That Saves the Bay Area from Summer Heat
- Bay Area Ozone: Why Summer Smog Peaks in the Inland Valleys
- Bay Area Coastal vs. Inland: 30-Degree Temperature Differences
- Bay Area Microclimates and Rainfall Distribution
- Marine Layer vs. Tule Fog: What's the Difference?
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)
- East Bay Regional Park District, Contra Loma Regional Park (accessed 2026-10-27)
- BART, Antioch Station (accessed 2026-10-27)
- East Bay Regional Park District, Black Diamond Mines Regional Preserve (accessed 2026-10-27)
Rendered 2026-11-15T12:04:15.720Z.