Montana (Glacier National Park)
September
Weather in Montana for September 2025
Your guide to Montana weather in September - trends and predictions
Wind Advisory - See hour by hour.
Expect cooler weather in the next days in Montana with the forecast suggesting a temperature of 21.1 °F, lower than the historical average.
In general, the average temperature in Montana at the beginning of September is 26.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.3 °F by the end of September.
With an average of 5 rainy days, Montana experiences minimal rainfall in September.
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Official Weather Alert ⚠️
Temperatures
Rain 🌧️
More
25
Dry days
5
Rainy days
0
Snow days
22°/9°
Temperatures
12 km/h
Avg max wind
54 %
Avg humidity
Montana Weather September
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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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 32° /13° | 0 mm | 8 | |
| Sept. 2 |  Partly cloudy | 31° /13° | 0 mm | 8 | |
| Sept. 3 | Overcast | 28° /13° | 0 mm | 7 | |
| Sept. 4 | Partly cloudy | 19° /14° | 0 mm | 1.1 | |
| Sept. 5 |  Sunny | 23° /6° | 0 mm | 1.3 | |
| Sept. 6 | Sunny | 24° /6° | 0 mm | 1.4 | |
| Sept. 7 |  Patchy rain possible | 27° /7° | 0.1 mm | 1 | |
| Sept. 8 | Patchy rain possible | 24° /7° | 0.6 mm | 0 | |
| Sept. 9 |  Cloudy | 21° /4° | 0 mm | 3 | |
| Sept. 10 |  Moderate rain | 16° /8° | 6.2 mm | 3 | |
| Sept. 11 | Patchy rain possible | 14° /5° | 1 mm | 3 | |
| Sept. 12 | Overcast | 17° /4° | 0 mm | 2 | |
| Sept. 13 | Sunny | 24° /3° | 0 mm | 4 | |
| Sept. 14 | Patchy rain possible | 15° /6° | 3.3 mm | 3 | |
| Sept. 15 | Partly cloudy | 22° /4° | 0 mm | 4 | |
| Sept. 16 | Sunny | 24° /5° | 0 mm | 4 | |
| Sept. 17 | Sunny | 26° /6° | 0 mm | 5 | |
| Sept. 18 | Overcast | 17° /11° | 20.5 mm | 4 | |
| Sept. 19 | Patchy rain possible | 21° /9° | 0.1 mm | 5 | |
| Sept. 20 | Patchy rain possible | 16° /9° | 0.3 mm | 4 | |
| Sept. 21 | Overcast | 16° /4° | 0 mm | 4 | |
| Sept. 22 | Overcast | 18° /6° | 0 mm | 4 | |
| Sept. 23 | Partly cloudy | 21° /9° | 0 mm | 6 | |
| Sept. 24 | Sunny | 23° /10° | 0 mm | 6 | |
| Sept. 25 | Patchy rain possible | 27° /13° | 0.9 mm | 6 | |
| Sept. 26 | Cloudy | 18° /11° | 1.8 mm | 4 | |
| Sept. 27 | Cloudy | 20° /7° | 0 mm | 5 | |
| Sept. 28 | Partly cloudy | 25° /8° | 0 mm | 6 | |
| Sept. 29 | Patchy rain possible | 16° /8° | 0.4 mm | 4 | |
| Sept. 30 | Sunny | 13° /3° | 0 mm | 4 | |
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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.
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Montana in September - FAQ
What are the expected maximum and minimum temperatures in Montana during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Montana during September?
In September, Montana can expect light to moderate rainfall, totaling 45.5 mm across approximately 5 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Montana during September?
The average wind speed in Montana during September is 12 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 ☀️
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