Climate in Boise

Boise, United States has a humid continental climate. The annual average temperature is about 12.3°C and the city receives roughly 801 mm of precipitation across 91 rainy days a year, with around 1751 hours of sunshine. The warmest month is Jul (highs near 27°C) and the coldest is Jan (lows near -2.5°C). These are deterministic, latitude- and region-based planning estimates — not a forecast or measured station data; check current conditions with an official meteorological service before travel.

Data year 2025; last updated 2026-05-16.

Boise is classified as Humid Continental. This reflects its annual temperature range and the seasonal pattern of its rainfall.

Boise receives about 801 mm of precipitation a year over roughly 91 rainy days. The wettest month is Jun and the driest is Jan.

Boise sees an estimated 1751 hours of sunshine a year, concentrated in the warmer months around Jul.

By temperature and rainfall, the most comfortable months in Boise are Sep, May, Aug. Conditions vary year to year — verify with a current forecast before booking.

Boise has a climate comfort score of 72/100, a comfortable year-round climate by this measure. The score weights mild temperatures most, then rainfall balance, sunshine, low seasonality, and the absence of extreme winter cold or summer heat.