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Cascade County (Great Falls)
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Weather in Cascade County, Montana for September 2026

Your guide to Cascade County weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Cascade County during September is quite rare, with fewer than 2 snowy days on average.
    According to Cascade County 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 Cascade County is slightly cooler than the historical average by 1.8 °F.

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

  • In general, the average temperature in Cascade County 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, Cascade County 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

Cascade County 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 Cascade County

See the weather trend as well as the moving average line

September weather in Cascade County 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 Cascade County 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 Cascade County forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Cascade County in September - FAQ

What are the expected maximum and minimum temperatures in Cascade County 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 Cascade County during September?
In September, Cascade County 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 Cascade County during September?
The average wind speed in Cascade County during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

Cascade County snow forecast September 2026

Track daily snowfall levels and discover Cascade County’s snowy potential this September ❄️

September rainfall patterns in Cascade County

Explore the daily rainfall trends and prepare for Cascade Countys September weather 💧
Typically, Cascade County has 5 rainy days in September with a total of 38.4 mm of rainfall.

UV exposure in Cascade County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Cascade County
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Great Falls
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Location coordinates Where is Cascade County?

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

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