Weather in San Jose: September
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Average day temperature: | 74.5°F |
| Average night temperature: | 60.6°F | |
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Sea water temperature: | 83.9°F |
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Number of sunny days: | 1 day |
| Day length: | 12.0 - 12.3 hours | |
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Number of rainy days: | 24 days |
| Precipitation totals: | 21.3 in. | |
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| San Jose |
temperature
| San Jose |
Air temperature in September, °F
The highest day temperature during September of 2026 was 72°F. At the same time the lowest night temperature was 59°F. Daily and nightly averages during September were 69.5°F and 60.5°F.
Sea water temperature in San Jose in September, °F
The average sea water temperature in September of 2026 was 86.5°F. The highest and lowest sea temperatures during the month were 87.4°F and 85.6°F.
Mostly all days in September are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in San Jose in September is 18.5 in. It makes september one of the most rainy months of the year.
The average wind speed value in September is 2.4 mph It makes September one of the least windy months 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 September is: 3.6.
Best time for vacation in San Jose
San Jose on a weather map
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