Weather in San Jose: December
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Average day temperature: | 62.4°F |
| Average night temperature: | 51.8°F | |
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Sea water temperature: | 62.0°F |
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Number of sunny days: | 24 days |
| Day length: | 9.6 - 9.8 hours | |
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Number of rainy days: | 1 day |
| Precipitation totals: | 0.5 in. | |
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forecast
| San Jose |
temperature
| San Jose |
Air temperature in December, °F
The highest day temperature during December of 2025 was 66°F. At the same time the lowest night temperature was 48°F. Daily and nightly averages during December were 59.2°F and 52.6°F.
Sea water temperature in San Jose in December, °F
The average sea water temperature in December of 2025 was 62.7°F. The highest and lowest sea temperatures during the month were 64.2°F and 61.5°F.
Mostly all days in December are sunny but cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in San Jose in December is 0.6 in. Other months of the year show relatively similar values.
The average wind speed value in December is 7.2 mph It makes December lest windy month of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 7.5.
Best time for vacation in San Jose
San Jose on a weather map
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