The highest day temperature in January 2025 was 96°F. The lowest night temperature was 77°F. The average values for day and night temperatures during January were 92.7°F и 79.9°F respectivly.

The average sea surface temperature in January 2025 for San Diego was 85.1°F. The maximum and minimum values were 83.4°F and 86.8°F respectively.

Most of the days in January are sunny but you can also expect cloudy and gloomy days.

Precipitation total in January for San Diego is 0.0 in. It makes january the least rainy month of the year.

The average wind speed in January is 12.7 mph. It makes January one of the most windy months of the year for San Diego.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for San Diego in January is 9.6 hours.