San Jose, CA Climate & Monthly Averages
San Jose has a Mediterranean climate. August is the hottest month, averaging 84° by day; December is the coldest at 58°.
Sunshine is a defining feature of San Jose's climate
San Jose runs on a dry-summer rhythm: the warmest months are also the driest. August averages less than 1 mm while the wet season peaks in January at 4.5 inches (115 mm). Highs range from 58°F (15°C) to 84°F (29°C).
How sun, temperature and rain fit together
5 months average under 20 mm of rain, the longest unbroken stretch running May through September. Warmth peaks in August: highs of 84°F (29°C), lows of 60°F (16°C). December sits at the other end of the year: 58°F (15°C) by day, 44°F (7°C) at night. The gridded 2015-2024 daily record for this location tops out at 116°F (47°C) and bottoms at 30°F (-1°C) - decade extremes, not all-time station records.
Relative humidity averages 66% across the year, drier than about 77% of the cities we track.
Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is April through May.
More climate facts for San Jose
- Hottest month: August - highs near 84°F (29°C)
- Coldest month: December - highs near 58°F (15°C)
- Decade extremes (2015-2024): 116°F (47°C) high · 30°F (-1°C) low
- Wettest month: January (10 rainy days) · Sunniest: July (13.8 h sun/day)
- Climate type: Mediterranean
- Annual swing: 11°C between the average warmest and coolest month · day to night: 11°C
- Average humidity: 66%
The most comfortable sunny-weather window
Best time to visit San Jose
The best time to visit San Jose is generally April to July and February, when the dry season is running but the afternoons are still bearable. Daytime temperatures in that window sit near 76°F (24°C), with rain on about 3 days a month. For the same question asked the other way round, see where else is warm in April.
What to pack
Pack for San Jose with light clothing for the warm months and rain gear if you travel around January. Note the gap between afternoon and night: August pairs 84°F (29°C) with 60°F (16°C).
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 59° | 44° | 10 | 4.5 in | 7.2 h/day | 9.9 h | 32% | 77% |
| February | 62° | 44° | 8 | 3.3 in | 8.9 h/day | 10.8 h | 27% | 70% |
| March | 64° | 46° | 10 | 3.7 in | 9.5 h/day | 11.9 h | 33% | 72% |
| April | 69° | 49° | 5 | 1.4 in | 11.3 h/day | 13.1 h | 15% | 67% |
| May | 74° | 53° | 3 | 0.6 in | 12.8 h/day | 14.2 h | 9% | 62% |
| June | 82° | 57° | 0 | 0.0 in | 13.7 h/day | 14.7 h | 1% | 57% |
| July | 84° | 59° | 0 | 0.1 in | 13.8 h/day | 14.5 h | 2% | 59% |
| August | 84° | 60° | 0 | 0.0 in | 12.9 h/day | 13.6 h | 0% | 62% |
| September | 83° | 60° | 1 | 0.2 in | 11.6 h/day | 12.4 h | 2% | 60% |
| October | 78° | 56° | 3 | 1.2 in | 10.2 h/day | 11.2 h | 9% | 59% |
| November | 65° | 48° | 6 | 2.1 in | 8.6 h/day | 10.1 h | 21% | 68% |
| December | 58° | 44° | 9 | 4.4 in | 7.3 h/day | 9.6 h | 30% | 76% |
San Jose month by month
Each card shows the average high and low. The bar places that month between San Jose's coldest night and warmest afternoon.
January
- Rain
- 10 days
- Sunshine
- 7.2 h
- Daylight
- 9.9 h
February
- Rain
- 8 days
- Sunshine
- 8.9 h
- Daylight
- 10.8 h
March
- Rain
- 10 days
- Sunshine
- 9.5 h
- Daylight
- 11.9 h
April
- Rain
- 5 days
- Sunshine
- 11.3 h
- Daylight
- 13.1 h
May
- Rain
- 3 days
- Sunshine
- 12.8 h
- Daylight
- 14.2 h
June
- Rain
- 0 days
- Sunshine
- 13.7 h
- Daylight
- 14.7 h
July
- Rain
- 0 days
- Sunshine
- 13.8 h
- Daylight
- 14.5 h
August
- Rain
- 0 days
- Sunshine
- 12.9 h
- Daylight
- 13.6 h
September
- Rain
- 1 day
- Sunshine
- 11.6 h
- Daylight
- 12.4 h
October
- Rain
- 3 days
- Sunshine
- 10.2 h
- Daylight
- 11.2 h
November
- Rain
- 6 days
- Sunshine
- 8.6 h
- Daylight
- 10.1 h
December
- Rain
- 9 days
- Sunshine
- 7.3 h
- Daylight
- 9.6 h
Looking for warmer alternatives? Browse warm places by month, or compare San Jose's coolest part of the year: December, January, February.
Seasonal weather under San Jose's sunnier skies
Spring (March through May)
Spring in San Jose settles into easy warmth, with daytime highs averaging 69°F (21°C) and nights around 49°F (10°C); rain comes on about 18 days over the three months. Daylight is generous - around 11.2 hours of sun a day.
Summer (June through August)
Summer is hot here - highs near 83°F (29°C), nights near 59°F (15°C), and precipitation is essentially absent. Daylight is generous - around 13.5 hours of sun a day.
Fall (September through November)
Through fall, San Jose settles into easy warmth: 75°F (24°C) by day, 54°F (12°C) after dark, and rain comes on about 10 days over the three months. Daylight is generous - around 10.1 hours of sun a day.
Winter (December through February)
Through winter, San Jose stays on the cool side of mild: 60°F (16°C) by day, 44°F (7°C) after dark, and expect showers on roughly 27 days across the season.
How unusual is San Jose?
- Rain or snow reaches the ground on 55 days a year - fewer wet days than all but 10% of the 3496 cities we track.
- The city sees 10.7 hours of sunshine on an average day - sunnier than 88% of the 3496 cities we track.
These comparisons use the same ten-year window for every city in the dataset.
San Jose temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.