The highest day temperature in January 2024 was 68°F. The lowest night temperature was 37°F. The average values for day and night temperatures during January were 56.5°F и 48.4°F respectivly.

You can expect various weather conditions during January. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in January for Napa is 1.5 in. It makes january one of the most rainy months of the year.

The average wind speed in January is 4.1 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 Napa in January is 5.7 hours.