Glacier National Park (MT)
September
Weather in Glacier National Park, Montana for September 2026
Your guide to Glacier National Park weather in September - trends and predictions
In general, the average temperature in Glacier National Park at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.3 °F by the end of September.
With an average of 5 rainy days, Glacier National Park experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
25
Dry days
5
Rainy days
0
Snow days
22°/9°
Temperatures
12 km/h
Avg max wind
54 %
Avg humidity
Glacier National Park Weather September
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Temperatures trend during September in Glacier National Park
See the weather trend as well as the moving average line
September weather in Glacier National Park 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 |  Sunny | 25° /12° | 0 mm | 7 | |
| Sept. 5 | Sunny | 27° /9° | 0 mm | 7 | |
| Sept. 6 | Sunny | 29° /10° | 0 mm | 8 | |
| Sept. 7 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 8 | Sunny | 28° /11° | 0 mm | 7 | |
| Sept. 9 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 10 | Sunny | 26° /10° | 1.8 mm | 7 | |
| Sept. 11 |  Patchy rain possible | 23° /12° | 3.9 mm | 6 | |
| Sept. 12 |  Heavy rain at times | 17° /11° | 7.4 mm | 4 | |
| Sept. 13 | Patchy rain possible | 21° /7° | 1.5 mm | 5 | |
| Sept. 14 | Patchy rain possible | 21° /9° | 0.1 mm | 5 | |
| Sept. 15 | Patchy rain possible | 17° /9° | 7.2 mm | 4 | |
| Sept. 16 | Sunny | 23° /8° | 0 mm | 6 | |
| Sept. 17 |  Moderate or heavy rain shower | 23° /12° | 1.2 mm | 6 | |
| Sept. 18 | Overcast | 22° /11° | 10.3 mm | 6 | |
| Sept. 19 | Patchy rain possible | 24° /10° | 0.1 mm | 6 | |
| Sept. 20 | Patchy rain possible | 21° /11° | 0.2 mm | 6 | |
| Sept. 21 | Overcast | 16° /8° | 4.1 mm | 4 | |
| Sept. 22 | Overcast | 18° /6° | 0 mm | 4 | |
| Sept. 23 | Partly cloudy | 23° /8° | 0 mm | 6 | |
| Sept. 24 | Sunny | 24° /10° | 0 mm | 7 | |
| Sept. 25 | Patchy rain possible | 27° /12° | 0.4 mm | 7 | |
| Sept. 26 |  Cloudy | 19° /11° | 0.9 mm | 5 | |
| Sept. 27 | Cloudy | 20° /6° | 0 mm | 6 | |
| Sept. 28 | Partly cloudy | 24° /9° | 0 mm | 6 | |
| Sept. 29 | Patchy rain possible | 20° /10° | 0.2 mm | 5 | |
| Sept. 30 | Sunny | 15° /7° | 11.4 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Glacier National Park 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 Glacier National Park forecast closer to your planned date for the most up-to-date weather information.
Change Month
Glacier National Park in September - FAQ
What are the expected maximum and minimum temperatures in Glacier National Park 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 Glacier National Park during September?
In September, Glacier National Park 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 Glacier National Park during September?
The average wind speed in Glacier National Park during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Glacier National Park
Explore the daily rainfall trends and prepare for Glacier National Parks September weather 💧
Typically, Glacier National Park has 5 rainy days in September with a total of 45.5 mm of rainfall.
UV exposure in Glacier National Park during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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