Montana (Billings)
September
Weather in Montana for September 2025
Your guide to Montana weather in September - trends and predictions
In general, the average temperature in Montana at the beginning of September is 31.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.6 °F by the end of September.
With an average of 2 rainy days, Montana experiences minimal rainfall in September.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
27°/13°
Temperatures
21 km/h
Avg max wind
41 %
Avg humidity
Montana Weather September
Move between months or click on a day
What’s the Weather Like in Montana This September?
Discover the average temperatures and weather trends across Montana’s cities this September.
Temperatures trend during September in Montana
See the weather trend as well as the moving average line
September weather in Montana day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 33° /14° | 0 mm | 8 | |
| Sept. 2 | Sunny | 36° /18° | 0 mm | 9 | |
| Sept. 3 |  Overcast | 31° /20° | 0 mm | 7 | |
| Sept. 4 |  Cloudy | 28° /14° | 0 mm | 6 | |
| Sept. 5 | Sunny | 30° /13° | 0 mm | 8 | |
| Sept. 6 | Sunny | 32° /13° | 0 mm | 8 | |
| Sept. 7 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 8 | Sunny | 36° /15° | 0 mm | 9 | |
| Sept. 9 |  Partly cloudy | 33° /19° | 0 mm | 8 | |
| Sept. 10 | Overcast | 29° /16° | 0 mm | 6 | |
| Sept. 11 |  Patchy rain possible | 30° /15° | 0.2 mm | 7 | |
| Sept. 12 |  Heavy rain at times | 19° /14° | 9 mm | 4 | |
| Sept. 13 | Cloudy | 21° /12° | 0 mm | 5 | |
| Sept. 14 | Overcast | 27° /11° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 29° /12° | 0 mm | 7 | |
| Sept. 16 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 17 | Patchy rain possible | 27° /13° | 0.2 mm | 6 | |
| Sept. 18 |  Moderate or heavy rain shower | 14° /11° | 58.9 mm | 3 | |
| Sept. 19 | Partly cloudy | 24° /12° | 0 mm | 6 | |
| Sept. 20 | Sunny | 25° /10° | 0 mm | 7 | |
| Sept. 21 | Sunny | 17° /6° | 0 mm | 5 | |
| Sept. 22 | Sunny | 24° /4° | 0 mm | 6 | |
| Sept. 23 | Overcast | 23° /10° | 0 mm | 5 | |
| Sept. 24 | Sunny | 26° /10° | 0 mm | 7 | |
| Sept. 25 | Sunny | 32° /13° | 0 mm | 8 | |
| Sept. 26 | Sunny | 29° /15° | 0 mm | 7 | |
| Sept. 27 | Sunny | 29° /10° | 0 mm | 7 | |
| Sept. 28 | Sunny | 28° /11° | 0 mm | 7 | |
| Sept. 29 | Sunny | 33° /11° | 0 mm | 8 | |
| Sept. 30 | Sunny | 16° /6° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Montana 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 Montana forecast closer to your planned date for the most up-to-date weather information.
Change Month
Montana in September - FAQ
What are the expected maximum and minimum temperatures in Montana during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Montana during September?
Moderate rainfall is anticipated in Montana during September, with a total of 68.4 mm spread over approximately 2 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Montana during September?
The average wind speed in Montana during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Montana
Explore the daily rainfall trends and prepare for Montanas September weather 💧
UV exposure in Montana during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Counties in Montana
Select a county for an accurate weather forecast
Top locations in Montana
Select a location for an accurate weather forecast
More Locations Quick links
More Montana weather pages
You are here
Where is Montana?Get accurate weather forecasts for Montana, located at latitude 45.783 and longitude -108.501. Stay updated with localized weather information tailored for Montana.
Found a mistake?
We appreciate your attention to details. Tell us here.