Boise and the Treasure Valley's climate is dominated by clear skies and sunny days. All four seasons are experienced in Boise, with the turning of Fall colors, a warm sunny Summer, beautiful Spring time and a cool but usually not too cold Winter.
Boise's coldest month is January with an average temperature of 24° F
The warmest month in Boise is July where temperatures average 89° F
Driest month is August with under .5 inches of rain
Wettest month is March where you can expect about 1.5 inches of rain.