Downtown San Jose Weather
Town • San Francisco Bay Area
Downtown San Jose is the high-rise core of the Bay Area's largest city. It sits on the flat valley floor between the Guadalupe River on its west side and Coyote Creek to the east. Guadalupe River Park threads 2.6 miles of trails through the urban core, with the Heritage Rose Garden in its Guadalupe Gardens. Both the Blue and Green light rail lines run through the center. Of the South Bay places nearby, it is the densest, most paved, and most built-up.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Downtown San Jose weather today and through the year
It's 53°F at Downtown San Jose right now (feels like 51°F), with 4 mph wind and a comfort score of 77. Monday's forecast high at Downtown San Jose is 56°F, 11°F below the mid November normal of 67°F. The best window today is 11 AM to 2 PM, at about 54°F with a 4 mph wind (comfort 60).
August is the warmest month at Downtown San Jose, with an average high of 84°F. December is the coldest, with an average low of 40°F. February is the wettest month (3.0 in.), out of about 14.8 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Downtown San Jose are September, June, and May. The best hours are usually 10 AM to 1 PM in September, 9 AM to noon in June, and 11 AM to 2 PM in May.
Buildings and pavement set downtown apart. Concrete and asphalt soak up summer sun and give it back after dark, so downtown evenings stay warmer than in leafy Willow Glen or Almaden Valley. The core is also slow to cool during heat waves.
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 Downtown San Jose in the next few days
No active National Weather Service alerts for this location.
Best time to go
The best window today is 11 AM to 2 PM, at about 54°F with a 4 mph wind (comfort 60).
Best day this week
Of the next 7 days, Friday looks best for Downtown San Jose, with a 61°F high and midday comfort near 74. Wednesday looks weakest (50).
Rain
Next good chance of rain: today (88%, about 0.33 in.).
Live weather map
Weather around Downtown San Jose right now
Overcast and 53° at Downtown San Jose right now.
About the live weather map for Downtown San Jose
The map centers on Downtown San Jose 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.
Downtown San Jose vs nearby places
Typical summer conditions compared with Downtown San Jose, 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 Downtown San Jose |
|---|---|---|---|---|---|
| Willow Glen | 2.2 mi | same | 9% | 10 mph | a very similar climate |
| Santa Clara | 3.9 mi | -3°F | 11% | 10 mph | a very similar climate |
| Campbell | 5 mi | +2°F | 8% | 9 mph | about 28% more rain a year |
| Don Edwards Wildlife Refuge | 15.2 mi | -20°F | 18% | 16 mph | about 20°F cooler on summer afternoons and windier summer afternoons (16 vs 10 mph) |
| Coyote Hills Regional Park | 18.6 mi | -20°F | 21% | 14 mph | about 20°F cooler on summer afternoons and windier summer afternoons (14 vs 10 mph) |
| Bonny Doon | 25 mi | -12°F | 56% | 8 mph | about 3 times as much rain a year and more summer morning fog (56% vs 8% of morning hours) |
Places with a climate like Downtown San Jose's
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Downtown San Jose climate comparisons mean
These cards compare recent conditions at Downtown San Jose 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 Downtown San Jose 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.
Downtown San Jose weather by month
August is the warmest month at Downtown San Jose, with an average high of 84°F. December is the coldest, with an average low of 40°F. February is the wettest month (3.0 in.), out of about 14.8 in. a year. Morning fog peaks in December, when fog or low cloud covers 17% of the hours from 6 to 10 AM. July has the clearest middays, with clouds covering about 5% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Downtown San Jose are September, June, and May. The best hours are usually 10 AM to 1 PM in September, 9 AM to noon in June, and 11 AM to 2 PM in May.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 60°F | 40°F | 2.9 in | 7 | 12% | 29% | 5 mph | 9.9 h | 62 |
| Feb | 63°F | 43°F | 3.0 in | 7 | 9% | 24% | 7 mph | 10.8 h | 66 |
| Mar | 67°F | 44°F | 2.4 in | 7 | 8% | 29% | 8 mph | 11.9 h | 69 |
| Apr | 71°F | 46°F | 1.1 in | 5 | 5% | 22% | 9 mph | 13.2 h | 80 |
| May | 76°F | 50°F | 0.5 in | 3 | 5% | 17% | 10 mph | 14.2 h | 87 |
| Jun | 81°F | 54°F | 0.1 in | 1 | 5% | 7% | 10 mph | 14.7 h | 88 |
| Jul | 84°F | 56°F | 0.0 in | 0 | 9% | 5% | 10 mph | 14.5 h | 87 |
| Aug | 84°F | 56°F | 0.0 in | 1 | 8% | 6% | 9 mph | 13.5 h | 87 |
| Sep | 83°F | 54°F | 0.1 in | 1 | 6% | 10% | 9 mph | 12.3 h | 89 |
| Oct | 77°F | 50°F | 0.7 in | 3 | 8% | 13% | 7 mph | 11.1 h | 85 |
| Nov | 67°F | 44°F | 1.4 in | 5 | 10% | 20% | 6 mph | 10.1 h | 80 |
| Dec | 59°F | 40°F | 2.6 in | 7 | 17% | 31% | 5 mph | 9.6 h | 60 |
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 Downtown San Jose's weather different
When the fog burns off
noonwhen December fog usually thins (20% foggy at 8 AM)
Fog or low cloud covers Downtown San Jose in 20% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by noon. April mornings are the least foggy (5%).
When the wind picks up
2 PMwhen afternoon wind builds, February–October
From February through October, wind at Downtown San Jose typically builds after 2 PM. In June it peaks around 5 PM, averaging 11 mph with 4% of those hours windy, while mornings average 3 mph.
Daylight
9.6–14.7 hof daylight, Dec to Jun
Days at Downtown San Jose range from about 9.6 hours in December to 14.7 hours in June. In mid-June the sun sets around 8:29 PM, and in mid-December around 4:56 PM.
Seasons at Downtown San Jose
- Warm seasonJun 27 – Sep 25 · highs 82°F+
The warm season lasts about 3 months, from Jun 27 to Sep 25, when the average high is 82°F or warmer. Highs peak around Aug 8 at about 84°F.
- Cool seasonNov 27 – Feb 27 · highs 65°F or lower
The cool season runs from Nov 27 to Feb 27, when the average high is 65°F or lower. The coldest nights come around Dec 8, with an average low near 40°F.
- Rainy seasonDec 4 – Mar 21 · 67% of the year's rain
The rainy season runs from Dec 4 to Mar 21, when a day has at least a 20% chance of measurable rain. That stretch brings 67% 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 8 and half of its annual total by Jan 29.
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, Downtown San Jose averaged 20 days a year at 90°F or hotter and 8 nights a year at or below freezing. It averaged 10 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 50 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Jun 11, 2026 (100°F) and the coldest night was Jan 27, 2025 (28°F). The wettest day was Feb 5, 2025 (1.22 in.), and the strongest 2 PM gust was 39 mph on Feb 4, 2025.
- 20days at 90°F or hotter
- 8nights at or below freezing
- 10days with ½ in. of rain or more
- 1afternoon with 20+ mph wind
- 50mornings with 3+ hours of fog or low cloud
- Hottest day100°FJun 11, 2026
- Coldest night28°FJan 27, 2025
- Wettest day1.22 inFeb 5, 2025
- Strongest 2 PM gust39 mphFeb 4, 2025
What shapes Downtown San Jose's weather
Downtown sits several miles south of the bay's tip at Alviso, with the Santa Cruz Mountains blocking the ocean to the southwest. Marine air arrives the long way, as a northwest breeze running down the bay in the afternoon. It reaches downtown later than it reaches Santa Clara, which stays a few degrees cooler. Summer days are reliably sunny. Low clouds reach downtown only on some mornings and rarely last.
The Santa Cruz Mountains wring out much of the rain from winter storms, so downtown stays drier than the foothill towns. Floods come from upstream instead. Heavy rain in the hills can send the Guadalupe River and Coyote Creek over their banks, as Coyote Creek did east of downtown in February 2017.
Tips for visiting Downtown San Jose
Ride light rail through the center
VTA's Blue and Green lines both serve downtown, linking it to North San Jose, South San Jose, Diridon Station, and Campbell.
Walk the river park
Guadalupe River Park has 2.6 miles of trails through downtown. The visitor center hands out maps and runs classes.
See the roses in bloom
The Heritage Rose Garden in the Guadalupe Gardens grows about 3,700 rose varieties.
Stay off creek trails in big storms
On February 21, 2017, Coyote Creek overtopped its banks between Montague Expressway and Tully Road, and thousands of residents were evacuated.
Downtown San Jose through the seasons
- Spring (March–May)
- Spring is mild, and the rain tapers off after March. It is the season for the rose garden and river trails before summer heat builds.
- Summer (June–August)
- Summer afternoons are sunny and warm, with a light northwest breeze. Evenings in the core stay warm long after sunset.
- Fall (September–October)
- September stays nearly as hot as August. Heat waves come when the bay breeze fails, and downtown then holds the heat overnight. Wildfire smoke can drift in on fire days elsewhere in the state.
- Winter (November–February)
- Winter is the rainy season, with the most rain from December through February. Morning fog or low cloud is most common in December, and calm, clear nights turn cold.
Activities and the weather that matters
- Walking and biking Guadalupe River Park: The river trails are best on spring mornings and mild fall days. Summer afternoons on the open trail are hot.
- Outdoor dining and events: Downtown's warm summer and fall evenings suit patios and street events. Winter nights cool quickly.
- Garden visits: The Heritage Rose Garden and historic orchard are at their best on calm spring days.
Official sources and current conditions
- Guadalupe River Park Conservancy
- VTA light rail
- Valley Water: Coyote Creek flood protection project
- Bay Area Air District: Spare the Air alerts
- National Weather Service, San Francisco Bay Area forecast office
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 | 86 | 65.2° / 43° | 6.5h | 1d | 1.54" | 23 |
| December 2024 | 79 | 63.5° / 42.9° | 5.3h | 6d | 2.46" | 14 |
| January 2025 | 88 | 63° / 37.4° | 7.1h | 1d | 0.06" | 26 |
| February 2025 | 81 | 64.1° / 42.4° | 6.6h | 3d | 3.79" | 17 |
| March 2025 | 86 | 64.8° / 44.8° | 8.1h | 4d | 1.76" | 25 |
| April 2025 | 93 | 70.9° / 47.9° | 9.6h | 1d | 0.4" | 28 |
| May 2025 | 96 | 77.1° / 51.1° | 12h | 0d | 0.06" | 31 |
| June 2025 | 96 | 78.2° / 54.3° | 12.6h | 1d | 0" | 30 |
| July 2025 | 94 | 80.2° / 58° | 11.8h | 0d | 0" | 31 |
| August 2025 | 92 | 83.6° / 58.9° | 10.9h | 4d | 0" | 30 |
| September 2025 | 93 | 81.8° / 61.5° | 9.6h | 1d | 0.17" | 30 |
| October 2025 | 89 | 74.5° / 52° | 8h | 2d | 1.57" | 27 |
| November 2025 | 80 | 66.6° / 47.3° | 6.3h | 10d | 2.58" | 16 |
| December 2025 | 72 | 60.5° / 43.7° | 4.7h | 13d | 2.14" | 8 |
| January 2026 | 83 | 64.1° / 40.4° | 6.6h | 4d | 2.52" | 22 |
| February 2026 | 81 | 66.4° / 45° | 6.7h | 4d | 3.09" | 19 |
| March 2026 | 95 | 78.5° / 49° | 9.8h | 0d | 0" | 30 |
| April 2026 | 90 | 71.2° / 49.8° | 9.1h | 1d | 1.86" | 25 |
| May 2026 | 94 | 75.2° / 53.4° | 11.5h | 2d | 0.2" | 31 |
| June 2026 | 94 | 80.9° / 57.3° | 12.1h | 0d | 0" | 29 |
| July 2026 | 94 | 81.5° / 58.6° | 11.6h | 0d | 0" | 30 |
| August 2026 | 93 | 82.8° / 59.9° | 10.7h | 3d | 0.02" | 31 |
| September 2026 | 94 | 81.2° / 56.2° | 10h | 1d | 0.05" | 29 |
| October 2026 | 91 | 78.7° / 51.8° | 8.1h | 1d | 0.13" | 28 |
Climate Trends
Average Temperature by Month
About the Downtown San Jose climate charts
The temperature chart compares average monthly highs and lows at Downtown San Jose, 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 Downtown San Jose. 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 Downtown San Jose, 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 Downtown San Jose in 20% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by noon. April mornings are the least foggy (5%).
- Wind: From February through October, wind at Downtown San Jose typically builds after 2 PM. In June it peaks around 5 PM, averaging 11 mph with 4% of those hours windy, while mornings average 3 mph.
- Cloud Cover: July middays are the clearest at Downtown San Jose (5% average cloud cover), and December middays are the cloudiest (31%).
- Solar Radiation: The strongest typical sun at Downtown San Jose comes at 1 PM in July, averaging 988 W/m².
How to read the hourly heatmaps for Downtown San Jose
This heatmap shows how average temperature at Downtown San Jose 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 Downtown San Jose. 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 Downtown San Jose 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 Downtown San Jose 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 Downtown San Jose 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 Downtown San Jose
- October 2026 recap: October 2026 at Downtown San Jose averaged a high of 79°F, 2°F warmer than the 1991-2020 normal of 77°F. It brought 0.13 in. of rain, compared with a normal of 0.66 in.
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 14.0 in. of rain to Downtown San Jose, 95% of the 14.8 in. normal.
Location Details
Downtown San Jose weather questions
Everything you need to know about weather and visiting Downtown San Jose
What is the weather like at Downtown San Jose today?
It's 53°F at Downtown San Jose right now, with a comfort score of 77 (great). Monday's forecast high at Downtown San Jose is 56°F, 11°F below the mid November normal of 67°F. The best window today is 11 AM to 2 PM, at about 54°F with a 4 mph wind (comfort 60).
What is the best month to visit Downtown San Jose?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Downtown San Jose are September, June, and May. The best hours are usually 10 AM to 1 PM in September, 9 AM to noon in June, and 11 AM to 2 PM in May. The warm season lasts about 3 months, from Jun 27 to Sep 25, 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 Downtown San Jose?
August is the warmest month at Downtown San Jose, with an average high of 84°F. December is the coldest, with an average low of 40°F.
When does the fog burn off at Downtown San Jose?
Fog or low cloud covers Downtown San Jose in 20% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by noon. April mornings are the least foggy (5%).
When is it windiest at Downtown San Jose?
From February through October, wind at Downtown San Jose typically builds after 2 PM. In June it peaks around 5 PM, averaging 11 mph with 4% of those hours windy, while mornings average 3 mph.
How much rain does Downtown San Jose get?
February is the wettest month (3.0 in.), out of about 14.8 in. a year. The rainy season runs from Dec 4 to Mar 21, when a day has at least a 20% chance of measurable rain. That stretch brings 67% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 14.0 in. of rain to Downtown San Jose, 95% of the 14.8 in. normal.
What kind of place is Downtown San Jose?
Downtown San Jose is the high-rise core of the Bay Area's largest city. It sits on the flat valley floor between the Guadalupe River on its west side and Coyote Creek to the east. Guadalupe River Park threads 2.6 miles of trails through the urban core, with the Heritage Rose Garden in its Guadalupe Gardens. Both the Blue and Green light rail lines run through the center. Of the South Bay places nearby, it is the densest, most paved, and most built-up.
What is Downtown San Jose weather like in November?
November at Downtown San Jose averages a high of 67°F and a low of 44°F, with 1.4 in. of rain over about 5 rainy days. About 10% of morning hours are foggy. Afternoon wind averages 6 mph.
More about Downtown San Jose weather
Guides that explain the weather here and nearby
- Bay Area Rainfall Totals by City: Who Gets the Most Rain?
- Flood Advisory vs. Flood Warning in the Bay Area: How to Know When to Act
- Bay Area Tornado Watch vs. Warning: Can Tornadoes Actually Hit the Bay?
- Fremont Weather Guide: Summer, Winter, Mission Peak and Nearby Cities
- Urban Heat Island Effect in San Francisco and the Bay Area
- Why the East Bay Gets More Rain Than the Peninsula
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.
- VTA, Light Rail Travel Information (accessed 2026-10-27)
- Guadalupe River Park Conservancy (accessed 2026-10-27)
- Valley Water, E1: Coyote Creek Flood Protection (accessed 2026-10-27)
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