San Jose, CA Climate & Monthly Averages
The climate of San Jose
Weather in San Jose is shaped by its Mediterranean climate - expect hot, dry summers and mild, wetter winters. August afternoons typically reach 84°F (29°C), while December highs hover near 58°F (15°C). Annual precipitation averages 21.5 inches (547 mm) over about 55 rainy days.
Climate quick facts
- Hottest month: August - highs near 84°F (29°C)
- Coldest month: December - highs near 58°F (15°C)
- Record high: 116°F (47°C) · Record low: 30°F (-1°C) (2015–2024)
- Wettest month: January (10 rainy days) · Sunniest: July (13.8 h sun/day)
- Climate type: Mediterranean - hot, dry summers and mild, wetter winters
Temperatures through the year
The warmest stretch of the year centers on August. Highs average 84°F (29°C) and overnight lows stay near 60°F (16°C). The coolest month is December, with typical highs of 58°F (15°C) and lows around 44°F (7°C). Based on 2015–2024 weather data, temperatures have reached as high as 116°F (47°C) and dropped as low as 30°F (-1°C).
Rain, sun and snow
January is usually the wettest month. It brings about 4.5 inches (115 mm) of rain over 10 days, while August is the driest. July brings the most sunshine, averaging 13.8 hours of sun a day.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 59° | 44° | 10 | 4.5 in | 7.2 h/day | 77% |
| February | 62° | 44° | 8 | 3.3 in | 8.9 h/day | 70% |
| March | 64° | 46° | 10 | 3.7 in | 9.5 h/day | 72% |
| April | 69° | 49° | 5 | 1.4 in | 11.3 h/day | 67% |
| May | 74° | 53° | 3 | 0.6 in | 12.8 h/day | 62% |
| June | 82° | 57° | 0 | 0.0 in | 13.7 h/day | 57% |
| July | 84° | 59° | 0 | 0.1 in | 13.8 h/day | 59% |
| August | 84° | 60° | 0 | 0.0 in | 12.9 h/day | 62% |
| September | 83° | 60° | 1 | 0.2 in | 11.6 h/day | 60% |
| October | 78° | 56° | 3 | 1.2 in | 10.2 h/day | 59% |
| November | 65° | 48° | 6 | 2.1 in | 8.6 h/day | 68% |
| December | 58° | 44° | 9 | 4.4 in | 7.3 h/day | 76% |
San Jose month by month
San Jose weather in January
January brings highs around 59°F (15°C), lows near 44°F (7°C), about 10 wet days - typically the wettest month of the year in San Jose.
San Jose weather in February
February brings highs around 62°F (17°C), lows near 44°F (7°C), about 8 wet days.
San Jose weather in March
March brings highs around 64°F (18°C), lows near 46°F (8°C), about 10 wet days.
San Jose weather in April
April brings highs around 69°F (20°C), lows near 49°F (10°C), about 5 wet days.
San Jose weather in May
May brings highs around 74°F (23°C), lows near 53°F (12°C), about 3 wet days.
San Jose weather in June
June brings highs around 82°F (28°C), lows near 57°F (14°C), about 0 wet days.
San Jose weather in July
July brings highs around 84°F (29°C), lows near 59°F (15°C), about 0 wet days - typically the sunniest month of the year in San Jose.
San Jose weather in August
August brings highs around 84°F (29°C), lows near 60°F (16°C), about 0 wet days - typically the hottest month and the driest month of the year in San Jose.
San Jose weather in September
September brings highs around 83°F (28°C), lows near 60°F (15°C), about 1 wet days.
San Jose weather in October
October brings highs around 78°F (25°C), lows near 56°F (13°C), about 3 wet days.
San Jose weather in November
November brings highs around 65°F (18°C), lows near 48°F (9°C), about 6 wet days.
San Jose weather in December
December brings highs around 58°F (15°C), lows near 44°F (7°C), about 9 wet days - typically the coldest month of the year in San Jose.
Seasons in San Jose
Spring (March through May)
Spring in San Jose is pleasantly warm, with daytime highs averaging 69°F (21°C) and nights around 49°F (10°C); rain falls on about 18 days over the three months.
Summer (June through August)
Summer in San Jose brings hot afternoons, with daytime highs averaging 83°F (29°C) and nights around 59°F (15°C); precipitation is infrequent.
Fall (September through November)
Fall in San Jose brings comfortable warmth, with daytime highs averaging 75°F (24°C) and nights around 54°F (12°C); rain falls on about 10 days over the three months.
Winter (December through February)
Winter in San Jose stays on the cool side of mild, with daytime highs averaging 60°F (16°C) and nights around 44°F (7°C); expect showers on roughly 27 days across the season.
Climate questions, answered
What is the average temperature in San Jose?
Is San Jose hot in summer?
Is San Jose cold in winter?
How many rainy days does San Jose get in a year?
Best time to visit San Jose
The best time to visit San Jose is generally April to July and February, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 76°F (24°C).
Pack for San Jose with rain gear if you travel around January. Evenings can feel noticeably cooler than afternoons - August nights average 60°F (16°C).
San Jose temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.