Weather in San Francisco: August
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Average day temperature: | 65.5°F |
| Average night temperature: | 56.9°F | |
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Sea water temperature: | 61.7°F |
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Number of sunny days: | 14 days |
| Day length: | 13.0 - 14.1 hours | |
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Number of rainy days: | 0 days |
| Precipitation totals: | 0.2 in. | |
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forecast
| San Francisco |
temperature
| San Francisco |
Air temperature in August, °F
The highest day temperature during August of 2025 was 64°F. At the same time the lowest night temperature was 54°F. Daily and nightly averages during August were 60.5°F and 56.3°F.
Sea water temperature in San Francisco in August, °F
The average sea water temperature in August of 2025 was 63.8°F. The highest and lowest sea temperatures during the month were 65.1°F and 62.4°F.
Mostly all days in August are sunny but cloudy days are also possible.
Precipitation total in August, in.
Precipitation total value in San Francisco in August is 0.1 in. Other months of the year show relatively similar values.
The average wind speed value in August is 8.2 mph
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 August is: 8.5.
Best time for vacation in San Francisco
San Francisco on a weather map
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