September

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Great Falls Weather September

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August

October

Temperatures trend during September in Great Falls

See the weather trend as well as the moving average line

September weather in Great Falls day by day

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August October

Date	Weather	Temperatures	Rain	UV
Sept. 1	Sunny	32° /11°	0 mm	6
Sept. 2	Overcast	33° /14°	0.1 mm	5
Sept. 3	Sunny	27° /12°	0 mm	6
Sept. 4	Overcast	22° /12°	0.2 mm	6
Sept. 5	Sunny	23° /7°	0 mm	6.3
Sept. 6	Sunny	24° /8°	0.9 mm	4
Sept. 7	Thundery outbreaks possible	22° /10°	118.4 mm	4
Sept. 8	Thundery outbreaks possible	23° /13°	0.3 mm	5
Sept. 9	Patchy rain possible	26° /10°	1.9 mm	5.9
Sept. 10	Thundery outbreaks possible	28° /13°	0 mm	5
Sept. 11	Moderate rain	20° /10°	24.4 mm	3
Sept. 12	Light rain	19° /9°	3 mm	3
Sept. 13	Patchy rain possible	22° /8°	1.2 mm	5
Sept. 14	Patchy rain possible	21° /8°	2 mm	4
Sept. 15	Patchy rain possible	18° /11°	2.2 mm	2
Sept. 16	Cloudy	20° /10°	0 mm	5
Sept. 17	Sunny	24° /9°	0 mm	5
Sept. 18	Sunny	25° /9°	0 mm	4
Sept. 19	Overcast	22° /11°	0 mm	3
Sept. 20	Sunny	26° /9°	0.1 mm	4.9
Sept. 21	Patchy rain possible	27° /10°	1.2 mm	4.8
Sept. 22	Moderate rain	23° /11°	10.9 mm	3
Sept. 23	Sunny	26° /8°	0 mm	4
Sept. 24	Sunny	29° /10°	0 mm	4
Sept. 25	Sunny	30° /11°	0.1 mm	4
Sept. 26	Sunny	20° /8°	0 mm	4
Sept. 27	Sunny	22° /5°	0 mm	3
Sept. 28	Sunny	25° /7°	0 mm	4
Sept. 29	Sunny	26° /10°	0 mm	2
Sept. 30	Patchy rain possible	20° /11°	1.5 mm	3
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Important Notice

Our weather forecast for Great Falls in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Great Falls forecast closer to your planned date for the most up-to-date weather information.

Change Month

Great Falls in September - FAQ

What are the expected maximum and minimum temperatures in Great Falls during September?

Enjoy moderate daytime temperatures of up to 24° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Great Falls during September?

Significant rainfall exceeding 168.3 mm is expected in Great Falls during September, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Great Falls during September?

The average wind speed in Great Falls during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Great Falls

Explore the daily rainfall trends and prepare for Great Fallss September weather 💧

Typically, Great Falls has 6 rainy days in September with a total of 168.3 mm of rainfall.

UV exposure in Great Falls during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
			1 32°	2 33°	3 27°	4 22°
5 23°	6 24°	7 22°	8 23°	9 26°	10 28°	11 20°
12 19°	13 22°	14 21°	15 18°	16 20°	17 24°	18 25°
19 22°	20 26°	21 27°	22 23°	23 26°	24 29°	25 30°
26 20°	27 22°	28 25°	29 26°	30 20°