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Weather in Great Falls, Montana for September 2026

Your guide to Great Falls weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Great Falls during September is quite rare, with fewer than 2 snowy days on average.
    According to Great Falls snow forecast for September 2026, 1 snowy day is expected in the next 2 weeks at Sunday, September 13.

    • Temperatures

  • Until now, September 2026 in Great Falls is slightly cooler than the historical average by 1.8 °F.

  • The forecast for the next days in Great Falls predicts a temperature of 20.9 °F, which is cooler than the historical average.

  • In general, the average temperature in Great Falls at the beginning of September is 26.1 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 26.9 °F by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Great Falls experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/9°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
50 %
Avg humidity

Great Falls Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
32°
2
Overcast
33°
3
Sunny
27°
4
Overcast
22°
5
Sunny
23°
6
Sunny
24°
7
Thundery outbreaks possible
22°
8
Thundery outbreaks possible
23°
9
Overcast
27°
10
Overcast
28°
11
Patchy rain possible
14°
12
Overcast
11°
13
Overcast
14°
14
Sunny
16°
15
Sunny
21°
16
Overcast
14°
17
Sunny
23°
18
Sunny
25°
19
Sunny
30°
20
Overcast
28°
21
Sunny
28°
22
Sunny
20°
23
Sunny
26°
24
Sunny
29°
25
Sunny
29°
26
Sunny
23°
27
Sunny
27°
28
Sunny
27°
29
Sunny
30°
30
Overcast
23°

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

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Sunny
Sunny
 32° /10° 0 mm 0 cm
Sept. 2 Overcast
Overcast
 33° /13° 0.1 mm 0 cm
Sept. 3 Sunny
Sunny
 27° /12° 0 mm 0 cm
Sept. 4 Overcast
Overcast
 22° /11° 0.2 mm 0 cm
Sept. 5 Sunny
Sunny
 23° /6° 0 mm 0 cm
Sept. 6 Sunny
Sunny
 24° /8° 0.9 mm 0 cm
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
 22° /10° 118.4 mm 0 cm
Sept. 8 Thundery outbreaks possible
Thundery outbreaks possible
 23° /12° 0.3 mm 0 cm
Sept. 9 Overcast
Overcast
 27° /10° 3.8 mm 0 cm
Sept. 10 Overcast
Overcast
 28° /14° 0.1 mm 0 cm
Sept. 11 Patchy rain possible
Patchy rain possible
 14° /9° 9.1 mm 0 cm
Sept. 12 Overcast
Overcast
 11° /9° 0.5 mm 0 cm
Sept. 13 Overcast
Overcast
 14° /3° 16.9 mm 0.7 cm
Sept. 14 Sunny
Sunny
 16° /4° 3.5 mm 0 cm
Sept. 15 Sunny
Sunny
 21° /7° 0 mm 0 cm
Sept. 16 Overcast
Overcast
 14° /9° 11 mm 0 cm
Sept. 17 Sunny
Sunny
 23° /6° 0 mm 0 cm
Sept. 18 Sunny
Sunny
 25° /11° 0 mm 0 cm
Sept. 19 Sunny
Sunny
 30° /14° 0 mm 0 cm
Sept. 20 Overcast
Overcast
 28° /19° 0 mm 0 cm
Sept. 21 Sunny
Sunny
 28° /15° 0 mm 0 cm
Sept. 22 Sunny
Sunny
 20° /12° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 26° /3° 0 mm 0 cm
Sept. 24 Sunny
Sunny
 29° /6° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 29° /8° 0 mm 0 cm
Sept. 26 Sunny
Sunny
 23° /8° 0 mm 0 cm
Sept. 27 Sunny
Sunny
 27° /5° 0 mm 0 cm
Sept. 28 Sunny
Sunny
 27° /5° 0 mm 0 cm
Sept. 29 Sunny
Sunny
 30° /7° 0 mm 0 cm
Sept. 30 Overcast
Overcast
 23° /12° 0 mm 0 cm
Next
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
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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 26° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Great Falls during September?
In September, Great Falls can expect light to moderate rainfall, totaling 38.4 mm across approximately 5 days. Occasional showers are possible, and planning ahead for them could be helpful.

What are the typical wind conditions in Great Falls during September?
The average wind speed in Great Falls during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

Great Falls snow forecast September 2026

Track daily snowfall levels and discover Great Falls’s snowy potential this September ❄️

September rainfall patterns in Great Falls

Explore the daily rainfall trends and prepare for Great Fallss September weather 💧
Typically, Great Falls has 5 rainy days in September with a total of 38.4 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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Location coordinates Where is Great Falls?

Get accurate weather forecasts for Great Falls, located at latitude 47.5 and longitude -111.301. Stay updated with localized weather information tailored for Great Falls.

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