Idaho local data guide
Average Temperatures in Boise, Idaho
Boise, Idaho, features a semi-arid climate characterized by distinct seasonal variations. Based on 1991–2020 climate normals, temperatures typically fluctuate between a winter low of 24°F and a summer high of 93°F, providing residents with four clear, recognizable seasons.
Updated with grounded research as of 2026-07-21.
The short answer
In Boise, the average temperature typically ranges from 24°F in the winter to 93°F in the peak of summer. As a city with a semi-arid climate, Boise experiences hot, dry summers and cold, snowy winters. Because the area is influenced by the surrounding Boise Foothills and the Treasure Valley's unique geography, residents can expect significant seasonal shifts throughout the year.
Key facts
- Climate Standard Period
- 1991–2020 (Latest 30-year climatological normals provided by NOAA)
- Typical Annual Temperature Range
- Approximately 24°F to 93°F throughout the year
Seasonal Climate Overview
Boise’s climate is defined by its inland location and protective mountain ranges, which help create a semi-arid environment. The city experiences four distinct seasons, each offering a different rhythm to local life. While winters are generally cold and bring moderate snowfall, summers are characteristically hot and dry, with low humidity levels that many residents find more comfortable than more humid regions.
Temperature Extremes and Trends
While 24°F and 93°F represent standard monthly averages, actual weather can deviate. Summer months occasionally produce triple-digit days, though these are typically balanced by cooler nights. Similarly, winter cold snaps can drop temperatures below the seasonal average, but prolonged extreme weather is relatively uncommon due to the moderating influence of the surrounding valley geography.
Topography and Local Microclimates
The Boise Foothills and the city's position within the Treasure Valley create local variations in temperature. Neighborhoods closer to the foothills or at higher elevations may experience slightly different temperatures compared to the valley floor. If you are planning a move or a building project, it is helpful to note that these elevation changes can influence the length of the growing season and the duration of snow cover.
Common questions
Is Boise's weather extreme?
Generally, no. Boise does not typically experience extreme events like hurricanes, blizzards, or tornadoes. The weather is widely considered moderate, though residents should prepare for distinct changes between the hot, dry summers and the cold, snowy winters.
How does the elevation of the Boise Foothills affect temperatures?
The Boise Foothills act as a boundary to the northeast, which can influence wind patterns and create subtle microclimates. Areas closer to these slopes may experience different temperature cooling or warming patterns compared to the lower-lying areas of the Treasure Valley.
Related Idaho questions
- What is the average annual snowfall in Boise, Idaho?
- How does the current Boise weather forecast compare to historical monthly averages?
- What are the hottest and coldest months on record for Boise?