San Diego
California, USA
Long-term weather forecast
Long-term weather forecast
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January weather forecast and Climate
San Diego, CA

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The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
January is the wettest month with 2.1" (53.3mm) of rainfall in San Diego as the mild winter continues its peaceful march. The average low temperature is around 49°F (9.4°C), but it is rare to see the nights touch 40°F (4.4°C). The days are on the shorter side at 10 hours, but the temperatures lie in the comfortable range of 60°F (15.6°C) to 70°F (21.1°C).
Though it is a little wet, the conditions around New Year are pleasant with the humidity at 63%, the lowest of the year. With the daily sunshine around 8 hours and a rain jacket for protection, San Diego is charming for outdoor activities.
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  • The average high temperature in January: 65.1°F

The warmest month (with the highest average high temperature) is August (76.4°F).
The month with the lowest average high temperature is December (64.7°F).

  • The average low temperature in January: 49°F

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is December (48.4°F).

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  • The average humidity in January: 63.1%

The month with the highest relative humidity is July (74.6%).
The month with the lowest relative humidity is January (63.1%).

  • The average rainfall in January: 2.1"

The wettest month (with the highest rainfall) is January (2.1").
The driest month (with the lowest rainfall) is July (0").

  • The average rainfall days in January: 6.7 days

The month with the highest number of rainy days is February (7.1 days).
The month with the lowest number of rainy days is August (0.4 days).

  • The average sea temperature in January: 59.2°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).

  • The average daylight in January: 10h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The average sunshine in January: 7.7h

The month with most sunshine is July (Average sunshine: 9.8h).
The month with least sunshine is December (Average sunshine: 7.5h).

  • The average UV index in January: 3

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).

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