Weather in San Diego: January
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Average day temperature: | 63.6°F |
| Average night temperature: | 53.2°F | |
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Sea water temperature: | 59.1°F |
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Number of sunny days: | 19 days |
| Day length: | 10.0 - 10.6 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 0.9 in. | |
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forecast
| San Diego |
temperature
| San Diego |
Air temperature in January, °F
The highest day temperature during January of 2026 was 82°F. At the same time the lowest night temperature was 47°F. Daily and nightly averages during January were 69.8°F and 54.3°F.
Sea water temperature in San Diego in January, °F
The average sea water temperature in January of 2026 was 61.5°F. The highest and lowest sea temperatures during the month were 62.8°F and 60.6°F.
Mostly all days in January are sunny but cloudy days are also possible.
Precipitation total in January, in.
Precipitation total value in San Diego in January is 1.2 in. Other months of the year show relatively similar values.
The average wind speed value in January is 5.5 mph It makes January 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 January is: 6.8.
Best time for vacation in San Diego
San Diego on a weather map
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