The highest day temperature in January 2025 was 82°F. The lowest night temperature was 52°F. The average values for day and night temperatures during January were 77.2°F и 55.6°F respectivly.

The average sea surface temperature in January 2025 for San Jose was 87.7°F. The maximum and minimum values were 85.6°F and 89.2°F respectively.

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

Precipitation total in January for San Jose is 1.7 in. It makes january one of the least rainy months of the year.

The average wind speed in January is 6.1 mph. It makes January one of the most windy months of the year for San Jose.

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 7.3 hours.