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.
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 |
Nearest destinations
Head-to-head
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Great Falls: questions and answers
What kind of destination is Great Falls?
Great Falls is a alpine / mountain town in United States at 1,116 m elevation with a hot-summer continental climate.
How many hours of sunshine does Great Falls get a year?
Great Falls gets about 2,659 hours of sunshine a year, at its best around July.
When is the best time to visit Great Falls?
The sunniest time to visit Great Falls is July, when the Sunshine Score peaks at 89/100 (with August and September close behind). Expect daytime highs around 30°C / 86°F.
What is the least sunny month in Great Falls?
January is the least sunny month in Great Falls, scoring 0/100 with about 24 mm of rain.
How strong is the sun in Great Falls?
The typical midday UV index in Great Falls peaks around 8 (very high) in July, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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