Cascade County (Great Falls)
September
Weather in Cascade County, Montana for September 2026
Your guide to Cascade County weather in September - trends and predictions
In general, the average temperature in Cascade County at the beginning of September is 26.9 °F. As the month progressed, temperatures tended to remain steady, reaching an average of 26.9 °F by the end of September.
With an average of 5 rainy days, Cascade County experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
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25
Dry days
5
Rainy days
0
Snow days
26°/9°
Temperatures
22 km/h
Avg max wind
50 %
Avg humidity
Cascade County Weather September
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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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 32° /12° | 0 mm | 7 | |
| Sept. 2 |  Overcast | 33° /13° | 0 mm | 7 | |
| Sept. 3 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 4 | Overcast | 19° /12° | 0 mm | 6 | |
| Sept. 5 | Sunny | 21° /4° | 0 mm | 6 | |
| Sept. 6 | Sunny | 26° /4° | 0 mm | 6 | |
| Sept. 7 |  Thundery outbreaks possible | 29° /9° | 0 mm | 6 | |
| Sept. 8 | Thundery outbreaks possible | 29° /14° | 0 mm | 6 | |
| Sept. 9 | Overcast | 27° /10° | 3.8 mm | 6 | |
| Sept. 10 | Thundery outbreaks possible | 28° /11° | 0 mm | 6 | |
| Sept. 11 |  Fog | 27° /11° | 0 mm | 5 | |
| Sept. 12 |  Light rain shower | 23° /12° | 6 mm | 4 | |
| Sept. 13 | Mist | 24° /10° | 0 mm | 5 | |
| Sept. 14 | Mist | 27° /8° | 0 mm | 5 | |
| Sept. 15 | Overcast | 17° /14° | 4.4 mm | 2 | |
| Sept. 16 |  Cloudy | 23° /12° | 0 mm | 5 | |
| Sept. 17 | Sunny | 26° /9° | 0 mm | 5 | |
| Sept. 18 | Sunny | 26° /7° | 0 mm | 5 | |
| Sept. 19 | Overcast | 25° /9° | 0 mm | 5 | |
| Sept. 20 | Sunny | 30° /8° | 0 mm | 4 | |
| Sept. 21 | Cloudy | 27° /9° | 2.4 mm | 5 | |
| Sept. 22 | Patchy rain possible | 18° /10° | 21.8 mm | 2 | |
| Sept. 23 | Sunny | 26° /3° | 0 mm | 4 | |
| Sept. 24 | Sunny | 29° /6° | 0 mm | 4 | |
| Sept. 25 | Sunny | 29° /8° | 0 mm | 4 | |
| Sept. 26 | Sunny | 23° /8° | 0 mm | 4 | |
| Sept. 27 | Sunny | 27° /5° | 0 mm | 4 | |
| Sept. 28 | Sunny | 27° /5° | 0 mm | 4 | |
| Sept. 29 | Sunny | 30° /7° | 0 mm | 3 | |
| Sept. 30 | Overcast | 23° /12° | 0 mm | 3 | |
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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.
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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.
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 ☀️
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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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