Temperatures Precipitation Sun/ Daylight Humidity Graphs Map Comparisons Forecast Hotels January February March April May June July August September October November December Weather in January in San Diego, California

• The average temperature in San Diego, California in January is mild at 14.1 °C (57.38 °F).
• Afternoons can be somewhat warm with average high temperatures reaching 18.8 °C (65.8 °F).
• Overnight temperatures are generally a little cool with an average low of 9.4 °C (48.9 °F).
• In January the mean diurnal temperature range/ variation is 9.4 °C (16.9 °F).
• The weather in January is a little parched with sporadic rain. A mere 45.7mm (1.8in) of liquid precipitates across on average 7 days.
• In January the heavens above San Diego, California are fine having on balance a measurable 6:50 of splendid sunshine daily.
• The shortest day is 10:01 long and the longest day is 10:32 long with an average length of 10:14.
• There are approximately 3:15 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
• It is sunny approximately 67.7% of daylight hours and cloudy 32.3% of daylight hours.

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Weather Trend Graph for January in San Diego, California, Usa

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