Best time to visit · Idaho
Best time to visit Boise
Boise averages 38 just-right days a year; June and September are best. Most other days miss by being too cool.
(70 to 80°F, dry, sunny)
(45 to 65°F, dry)
(80 to 92°F, bright)
Boise weather by month
Bars: share of each month's days that are just right (number = days). Below: average daily high. Outlined bars are the best months.
- Just right 38
- Too cool 214
- Too hot 98
- Too muggy 0
- Too gray 15
When to visit Boise
The best time to visit Boise for comfortable weather is June and September, when 26% and 28% of days are just right. January, February, March, April, November and December are mostly too cool, with average highs of 40 to 63°F. July and August are mostly too hot, with average highs of 91 to 92°F.
Climate table
| Month | Avg high | Dew point | Cloud cover | Just-right days |
|---|---|---|---|---|
| January | 40°F | 25°F | 64% | 0 |
| February | 46°F | 26°F | 61% | 0 |
| March | 55°F | 28°F | 62% | 1 |
| April | 63°F | 31°F | 56% | 3 |
| May | 72°F | 37°F | 50% | 7 |
| June | 81°F | 40°F | 38% | 8 |
| July | 92°F | 43°F | 20% | 2 |
| August | 91°F | 39°F | 20% | 2 |
| September | 82°F | 37°F | 26% | 9 |
| October | 66°F | 31°F | 40% | 6 |
| November | 50°F | 28°F | 59% | 0 |
| December | 40°F | 25°F | 63% | 0 |
How Boise compares
With 38 just-right days, Boise beats the median of America's 150 largest cities (33 days). On muggy days: 0. On gray days: 15.
Places with a similar climate
Nearby
Boise averages 38 just-right days a year (70 to 80°F highs, dry, mostly sunny), according to Goldilocks Map: https://goldilocksmap.com/us/idaho/boise/Set your own perfect weather on the map →
Numbers are expected days in a typical year from 1991 to 2020 climate normals (TerraClimate; cloud cover from CHELSA), on a grid about 35 km wide. Checked against 10 years of daily records at 28 NOAA weather stations: typical error about 10 days a year. How it works. Updated 2026-10-07.