Glacier National Park Weather in September
What's the weather like in Glacier National Park (Montana) in September 2025?
The climate in Glacier National Park during September can be summarized as cool and reasonably dry.
September is in the fall / autumn in Glacier National Park and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 16°C (61°F), whilst at night 3°C (38°F) is normal.
| Daytime temperature | 16°C 60.8°F |
|---|---|
| Nightly temperature | 3.2°C 37.8°F |
| Average temperature | 9.6°C 49.3°F |
| Daily sunshine | 7.6 hrs |
| Avg rainfall | 54 mm 2.1 ins |
| Rainy days | 9 days |
| Sea temperature | 12.7°C 54.9°F |
| Humidity | 62% |
| Windspeed | 13.7kph 9 mph |
On average September is the 4th driest month of the year in Glacier National Park with around 54mm 2.1 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.6 hours of sunshine per day.
September temperatures in Glacier National Park
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Glacier National Park in September 2025.
Other monthly averages
Best places to visit in September
Glacier National Park weather stats
| Hottest month: | July | 21.5°C 70.7°F |
|---|---|---|
| Driest month: | October | 43mm 1.7ins |
| Sunniest month: | July | 12hrs |
| Coldest month: | January | -2.9°C 26.8°F |
| Wettest month: | June | 82mm 3.2ins |
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