Current Weather and Forecast in Boise, ID
Idaho, United States 🇺🇸
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Explore Boise's typical temperatures and climate below - Live data returns shortly.
About the weather in Boise
Boise has a semi-arid climate. July is the warmest month, with average highs of 94°, and December the coldest, when nights fall to around 25°. December brings the most rain, on about 12 days, while July is the sunniest, with 14.0 hours of sunshine a day. Over a whole year it rains on roughly 77 days.
Boise climate guide: monthly averages, seasons and the best time to visit
Common questions
Does it snow in Boise?
Yes - about 18 days a year carry measurable snowfall, concentrated November through April.
What is the rainiest month in Boise?
December, at 2.2 inches (56 mm) over about 12 days. July is the driest month, at 2 mm (0.1 in).
What is the best time to visit Boise?
September to October and April is the sweet spot for Boise - temperatures sit either side of the peak heat rather than in it. Expect 72°F (22°C) in the afternoon and around 4 days of rain in a typical month of it. For the same question asked the other way round, see where else is warm in September.
What is the coldest month in Boise?
December, with highs of 38°F (4°C) and lows near 25°F (-4°C). The coldest day in the 2015-2024 record fell to -10°F (-23°C).
When is Boise at its hottest?
July, averaging 94°F (34°C) by day and 65°F (18°C) overnight. The hottest single day in our 2015-2024 record for this location reached 107°F (42°C).
Is Boise humid?
Relative humidity averages 52% across the year, which reads as dry. The most comfortable stretch falls in the drier half of the year.