The highest day temperature in January 2025 was 68°F. The lowest night temperature was 44°F. The average values for day and night temperatures during January were 61.3°F и 51.8°F respectivly.

The average sea surface temperature in January 2025 for San Jose was 61.1°F. The maximum and minimum values were 59.6°F and 63.0°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 Jose is 0.7 in. It makes january the most rainy month of the year.

The average wind speed in January is 7.8 mph. This value is relatively stable throughout the year.

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 Jose in January is 8.0 hours.