Considering a Move? Here’s the Real Story on Boise, Idaho Weather
If you’re thinking about moving to Boise, Idaho, you’re probably wondering:
“What is the weather like in Boise year-round?“
The short answer: Boise experiences four true seasons, but with a high desert climate that keeps things mild, dry, and sunny most of the year. Whether you’re relocating from Seattle, Phoenix, or the East Coast, this guide breaks down Boise’s weather by season, with practical tips and local insights to help you prepare.
Boise’s Climate: Dry, Sunny, and Surprisingly Mild
Located in the high desert of the Treasure Valley, Boise sees:
- Over 200 sunny days per year
- Just 11.5 inches of annual rainfall
- Low humidity, even in summer
What you won’t get much of: muggy air or constant rain. But expect wind, especially in spring and fall, and a dryness that’ll have you reaching for lotion.
Spring Weather in Boise (Mid-March to Late June)
Spring in Boise, Idaho is a colorful, transitional season. Local Foothills turn green, flowers bloom, and robins return. You’ll also get occasional spring snow or a surprise thunderstorm.
Average temperatures:
- Morning lows: 30s to 40s
- Afternoon highs: 50s to 70s
Thunderstorms arrive quickly, sometimes with high winds, especially in May and June. It’s the kind of season where layering is essential.
Pro tip: Dress in layers. Spring in Boise is moody, but in a charming way.
Check out the Boise Foothills Guide here
Summer in Boise (Late June through August)
If you’re moving from a humid state, Boise summers will feel hot—but manageable. The dry heat means that even 100°F+ doesn’t feel as sticky or stifling.
Boise summer stats:
- Highs: Low 90s to 100+
- Lows: Low 60s
- Daylight: Sunset around 10:00 p.m.
Evenings cool off nicely—great for Boise River walks, patio dining, or mountain biking in the Foothills.
Wildfire Smoke: A Late-Summer Issue
Boise’s valley location means it can trap smoke from nearby wildfires, affecting air quality in late July and August. It’s not every year, but it’s common enough to note.
Fall in Boise (September to Late October)
If you love crisp air, cozy clothes, and color-changing leaves, you’ll fall hard for Boise’s autumn.
Fall is Boise at its most beautiful. Known as the City of Trees, Boise bursts with color in September and October.
Boise fall weather:
- Lows: 30s to upper 40s
- Highs: 50s to low 80s
Take a scenic drive to the mountains for more color, or enjoy a walk under bright red and orange leaves downtown. October is the heart of sweater weather—and you’ll definitely want your camera.
Insider tip: Don’t pack up the patio furniture too early. Some fall afternoons are warm enough for one last outdoor dinner.
Winter in Boise (December through March)
Winter in Boise, Idaho is the shortest season of the year—and also the most unpredictable.
Average temps:
- Highs: 40s
- Lows: 20s
- Snowfall: ~20 inches per year
You might get light dustings of snow, a few icy mornings, or a surprise 8-inch snowfall. But more often, Boise winters are mild and manageable.
What’s an Inversion?
Inversions—where cold air gets trapped under warm air—are common in January. They create gray skies and chilly air in the valley. But if you’re craving sunlight, drive 30 minutes up to Bogus Basin for skiing, snowboarding, or just clear skies above the fog.
Does Boise Get a Lot of Snow?
Boise’s snowfall is light compared to other U.S. cities.
- Annual average: ~20 inches
- Snow days: Rare
- Major disruptions: Uncommon
Do you need AWD or 4WD?
- In town? No, most roads are quickly cleared.
- Heading to the mountains? Yes—especially if you visit Bogus Basin or go hiking in the winter.
A Quick Recap of Boise Weather by Season
| Season | Avg. Highs (°F) | Avg. Lows (°F) | Notables |
| Spring | 50s–70s | 30s–40s | Green hills, cool mornings, surprise storms |
| Summer | 90s+ (100°F+ at peak) | 60s | Dry heat, long days, wildfire smoke risk |
| Fall | 50s–80s | 30s–40s | Bright foliage, cool air, teaser warm days |
| Winter | 40s | 20s | Variable snow, short days, winter inversions |
Why Boise’s Weather Works for So Many People
Boise offers:
- Four true seasons without the extremes
- Lots of sunshine
- Manageable winters and warm, dry summers
- A rhythm that keeps outdoor lovers active year-round
Whether you’re skiing in January or paddleboarding in July, the Boise climate supports an active, outdoor lifestyle nearly 12 months a year.
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