Boise weather by month & the best time to visit
🇺🇸 United States · regional city · Mediterranean climate
The best time to visit Boise is September — its sunniest month (Sunshine Score 94/100), with June and May close behind. Boise averages about 2,989 hours of sunshine a year. Daytime highs around 27°C / 81°F and roughly 14 mm of rain in September.
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- Sun hours / year
- 2,989
- Sunniest month
- September
- Peak score
- 94/100
- Rain / year
- 390 mm
- Snow / year
- ≈91 cm
- Midday UV at peak
- 9 (very high)
- Population
- 338k
- Elevation
- 867 m
When is the best time to visit Boise?
For sunshine, the best time to visit Boise is September, then June and May. The dullest month is January (0/100, 51 mm of rain). The full month-by-month picture is in the table below.
How sunny is Boise?
Boise gets a lot of sun: around 2,989 hours a year. 94 Sunshine Score points separate September (94) from January (0), so the month you pick matters. It ranks #89 of 580 destinations in United States for annual sunshine, above the national median of 2,279 hours. Rain has a clear season: the wettest stretch, around December, carries about 40% of the annual 390 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV |
|---|---|---|---|---|---|
| January | 0 | 3° / 37°F | -4° / 25°F | 51 mm | 1 |
| February | 0 | 6° / 43°F | -2° / 28°F | 36 mm | 2 |
| March | 29 | 12° / 54°F | 1° / 34°F | 47 mm | 4 |
| April | 60 | 16° / 61°F | 4° / 39°F | 35 mm | 5 |
| May | 90 | 22° / 72°F | 9° / 48°F | 38 mm | 7 |
| June | 92 | 28° / 82°F | 13° / 55°F | 23 mm | 8 |
| July | 67 | 35° / 95°F | 19° / 66°F | 7 mm | 9 |
| August | 76 | 34° / 93°F | 18° / 64°F | 7 mm | 8 |
| September | 94 | 27° / 81°F | 13° / 55°F | 14 mm | 6 |
| October | 76 | 18° / 64°F | 6° / 43°F | 27 mm | 4 |
| November | 7 | 9° / 48°F | 0° / 32°F | 40 mm | 2 |
| December | 0 | 3° / 37°F | -4° / 25°F | 65 mm | 1 |
See Boise on the interactive sunshine globe →
Nearby places for sunshine
- Idaho Falls United States · 335 km · best in Jul · 2,995 h sun/yr
- Pasco United States · 377 km · best in Sep · 2,745 h sun/yr
- Redmond United States · 402 km · best in Jul · 2,712 h sun/yr
- Missoula United States · 408 km · best in Jul · 2,308 h sun/yr
- Jackson Hole United States · 442 km · best in Jul · 2,836 h sun/yr
- Spokane United States · 462 km · best in Jul · 2,367 h sun/yr
Nearest destinations
- McCall United States · 148 km · 2,837 h sun/yr · best in Jul
- Hailey United States · 155 km · 3,068 h sun/yr · best in Jul
- Twin Falls United States · 185 km · 3,018 h sun/yr · best in Jun
- Salmon United States · 254 km · 2,775 h sun/yr · best in Jul
- Pocatello United States · 303 km · 2,918 h sun/yr · best in Aug
Head-to-head
How Boise compares month by month: Boise vs Pasco · Boise vs Redmond · Boise vs Idaho Falls · all comparisons
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