Great Falls weather by month & the best time to visit
🇺🇸 United States · alpine / mountain town · hot-summer continental climate
The best time to visit Great Falls is July — its sunniest month (Sunshine Score 89/100), with August and September close behind. Great Falls averages about 2,659 hours of sunshine a year. Daytime highs around 30°C / 86°F and roughly 32 mm of rain in July.
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- Sun hours / year
- 2,659
- Sunniest month
- July
- Peak score
- 89/100
- Rain / year
- 473 mm
- Snow / year
- ≈1.6 m
- Midday UV at peak
- 8 (very high)
- Population
- 60k
- Elevation
- 1,116 m
When is the best time to visit Great Falls?
For sunshine, the best time to visit Great Falls is July, then August and September. The dullest month is January (0/100, 24 mm of rain). The full month-by-month picture is in the table below.
How sunny is Great Falls?
Great Falls gets a lot of sun: around 2,659 hours a year. 89 Sunshine Score points separate July (89) from January (0), so the month you pick matters. It ranks #155 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 May, carries about 43% of the annual 473 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV |
|---|---|---|---|---|---|
| January | 0 | 0° / 32°F | -8° / 18°F | 24 mm | 1 |
| February | 0 | 1° / 34°F | -9° / 16°F | 25 mm | 2 |
| March | 0 | 7° / 45°F | -4° / 25°F | 28 mm | 3 |
| April | 28 | 12° / 54°F | 0° / 32°F | 54 mm | 4 |
| May | 68 | 18° / 64°F | 5° / 41°F | 69 mm | 6 |
| June | 80 | 23° / 73°F | 10° / 50°F | 80 mm | 7 |
| July | 89 | 30° / 86°F | 14° / 57°F | 32 mm | 8 |
| August | 88 | 28° / 82°F | 13° / 55°F | 35 mm | 7 |
| September | 87 | 21° / 70°F | 7° / 45°F | 41 mm | 5 |
| October | 37 | 13° / 55°F | 1° / 34°F | 36 mm | 3 |
| November | 0 | 5° / 41°F | -4° / 25°F | 25 mm | 1 |
| December | 0 | 0° / 32°F | -8° / 18°F | 24 mm | 1 |
See Great Falls on the interactive sunshine globe →
Nearby places for sunshine
- Bozeman United States · 190 km · best in Jul · 2,641 h sun/yr
- Missoula United States · 215 km · best in Jul · 2,308 h sun/yr
- Kalispell United States · 234 km · best in Jul · 2,199 h sun/yr
- Billings United States · 285 km · best in Jul · 2,701 h sun/yr
- Jackson Hole United States · 434 km · best in Jul · 2,836 h sun/yr
- Idaho Falls United States · 445 km · best in Jul · 2,995 h sun/yr
Nearest destinations
- Helena United States · 108 km · 2,679 h sun/yr · best in Jul
- Havre United States · 168 km · 2,758 h sun/yr · best in Jul
- Butte United States · 190 km · 2,777 h sun/yr · best in Jul
Head-to-head
How Great Falls compares month by month: Great Falls vs Billings · Great Falls vs Missoula · Great Falls vs Bozeman · Great Falls vs Kalispell · all comparisons
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