Historical Weather in Boise, ID
See 55+ years of weather history for any date in Boise going back to 1970.
Part of Idaho weather history · Idaho temperature records
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Monthly Climate Averages
Historical temperature and precipitation averages for Boise, ID, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Boise, ID Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Boise, ID Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Boise, ID Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Growing Season & Frost in Boise, ID
Based on the dates the average overnight low reaches freezing (32°F / 0°C), from 50+ years of NOAA station data.
Boise, ID also averages 42 days a year at or above 90°F.
Hours of Daylight in Boise, ID
Day length across the year at 43.6°N latitude. Computed from solar geometry.
Best Time to Visit Boise, ID
Most pleasant months in Boise, ID: May, June, September, October.
What to expect on any date in Boise
Forecasts run out after about two weeks. For any date beyond that, see the range Boise actually delivers — typical high and low, how often it stays dry, and how the date has shifted since the 1970s.
Boise Temperature Records
- Record High: The hottest temperature ever recorded in Boise, ID is 113°F, set on July 12, 2002.
- Record Low: The coldest temperature ever recorded in Boise, ID is -25°F, set on December 22, 1990.
- Data Coverage: Based on 57 years of data from NOAA weather station: BOISE AIR TERMINAL.
All-Time Record High
All-Time Record Low
Monthly Temperature Records in Boise
| Month | Record High | Record Low |
|---|---|---|
| January | 66°F(2024) | -14°F(1977) |
| February | 72°F(1977) | -17°F(1989) |
| March | 81°F(2025) | 2°F(2022) |
| April | 93°F(1987) | 13°F(2011) |
| May | 103°F(2003) | 18°F(2022) |
| June | 110°F(2015) | 26°F(2002) |
| July | 113°F(2002) | 33°F(2000) |
| August | 110°F(2018) | 33°F(2010) |
| September | 105°F(2007) | 23°F(1970) |
| October | 95°F(1992) | 5°F(2002) |
| November | 80°F(1988) | -9°F(2010) |
| December | 65°F(1987) | -25°F(1990) |