Summer temperatures · California
How hot does San Jose get in summer?
In a typical summer, June to August, San Jose averages highs around 81°F and lows around 57°F.
About 16 days a year reach 90°F or hotter, and about one reaches 100°F. About 80 days a year get to 80°F or warmer. That makes it the 24th coolest summer of the 129 US cities we track.
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The hottest high in the forecast for the next 48 hours is about 63°F.
San Jose averages summer highs around 81°F and lows around 57°F, which is warm enough to make San Francisco’s fog look like a lifestyle choice.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer at a glance
| Average summer high | 81°F |
|---|---|
| Average summer low | 57°F |
| Days a year at 80°F or warmer | 80 |
| Days a year at 90°F or hotter | 16 |
| Days a year at 100°F or hotter | 1 |
| Average winter high, for comparison | 61°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Los Angeles, California: highs around 75°F, lows around 63°F
- Fargo, North Dakota: highs around 80°F, lows around 57°F
- Bismarck, North Dakota: highs around 82°F, lows around 56°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00023293.