Great Falls Weather Year-Round — Best Time to Visit
Great Falls, United States has cool weather year-round. The best time to visit is August (score: 94/100). Annual average high: 13.6°C, total rainfall: 397mm.
When is the best time to visit Great Falls?
94
August is the best month to visit Great Falls with a travel score of 94/100 (Excellent).
Expect highs of 28°C, 4 rain days, and 12.5 hours of daily sunshine.
View August weather details →Travel Score by Month
50
Jan
53
Feb
63
Mar
68
Apr
74
May
81
Jun
94
Jul
94
Aug
86
Sep
71
Oct
59
Nov
50
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Great Falls each month?
13.6°C
Avg High
2.5°C
Avg Low
397mm
Annual Rain
How much rain does Great Falls get?
Great Falls receives 397mm of rain annually. The wettest month is typically June with 69mm, while July is the driest.
What is the weather like each month in Great Falls?
January
50
1°C
Low: -8°C
5 rain days
Mixed
February
53
2°C
Low: -8°C
6 rain days
Mixed
March
63
7°C
Low: -4°C
6 rain days
Good
April
68
12°C
Low: 1°C
9 rain days
Good
May
74
18°C
Low: 6°C
10 rain days
Good
June
81
23°C
Low: 10°C
10 rain days
Excellent
July
94
29°C
Low: 15°C
4 rain days
Excellent
August
Best time to visit94
28°C
Low: 14°C
4 rain days
Excellent
September
86
22°C
Low: 10°C
6 rain days
Excellent
October
71
14°C
Low: 3°C
6 rain days
Good
November
59
6°C
Low: -2°C
5 rain days
Mixed
December
50
1°C
Low: -7°C
5 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31