San Jose, CA Climate & Monthly Averages
The climate of San Jose
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).
Climate quick facts
- 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%
Temperatures through the year
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.
Rain, sun and snow
Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is April through May.
How San Jose compares
- 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.
Ranked against every city in our dataset, each measured on the same ten-year window.
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
Average high and low for each month, with the bar showing where it sits in San Jose's year (left is the coldest night, right is the 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
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
Seasons in San Jose
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.
Climate questions, answered
How warm is San Jose on average?
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Is San Jose cold in winter?
Which months are driest in San Jose?
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.
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).
San Jose temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.