Boise in September
Great time to visit
September offers some of Boise's most pleasant weather with summer's warmth but autumn's comfortable temperatures. Crowds thin slightly from peak summer, but smart visitors know this is prime time.
Weather
September brings relief from summer's intensity with pleasantly warm days and noticeably cooler evenings. Afternoon temperatures settle into the comfortable mid-20s while mornings can dip into single digits. The first light rains return, but sunny days still dominate.
26°C high9°C low4 rain days
Crowds & Cost
high crowds
~$165/day average
Events & Festivals
- •Hyde Park Street Fair
- •Boise River Festival
- •Oktoberfest celebrations
September Tips
- •Perfect hiking weather returns - trails that were too hot in summer become pleasant again
- •Bring layers for temperature swings between day and night
- •Restaurant patios extend their seasons - great time for outdoor dining
All Months
May through October gives you the best of Boise's outdoor scene. Summer temperatures hit the mid-80s, perfect for floating the Boise River or hiking in the Foothills. But here's what locals know: September and early October are magic. Crowds thin out, temperatures drop to the comfortable 70s, and fall colors light up the cottonwoods along the river.
Winter brings snow to the mountains but not much to the city itself. Boise sits in a high desert, so you get cold, clear days perfect for exploring downtown or hitting up Bogus Basin ski area, just 16 miles from downtown. Hotel rates drop significantly December through March.
Avoid late July and August if you don't handle heat well. The high desert sun is intense, and afternoon temperatures can push into the 90s. Spring comes early here — by April you're seeing wildflowers in the Foothills and comfortable hiking weather returns.
Boise Scores
Solo
6/10
Couples
5/10
Families
8/10
Adventure
8/10
Budget
7/10
Luxury
4/10
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