The highest day temperature in January 2025 was 41°F. The lowest night temperature was 5°F. The average values for day and night temperatures during January were 30.9°F и 20.5°F respectivly.

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

Precipitation total in January for Boise is 0.8 in.

The average wind speed in January is 5.5 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 Boise in January is 4.1 hours.