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Glacier National Park (MT)
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Weather in Glacier National Park, Montana for September 2026

Your guide to Glacier National Park weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Glacier National Park has been significantly cooler than historical averages by 7.2 °F, with average temperature of 15.8 °F.

  • The forecast for the next days in Glacier National Park predicts a temperature of 17.3 °F, which is cooler than the historical average.

  • In general, the average temperature in Glacier National Park at the beginning of September is 25 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.4 °F by the end of September.

    • Rain 🌧️

  • Glacier National Park experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 50.6 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
21
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/10°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
53 %
Avg humidity

Glacier National Park Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
30°
2
Partly cloudy
29°
3
Overcast
23°
4
Sunny
21°
5
Sunny
24°
6
Sunny
25°
7
Sunny
23°
8
Sunny
22°
9
Sunny
24°
10
Sunny
24°
11
Patchy rain possible
20°
12
Overcast
17°
13
Patchy rain possible
18°
14
Patchy rain possible
16°
15
Overcast
14°
16
Sunny
19°
17
Sunny
24°
18
Sunny
23°
19
Sunny
21°
20
Sunny
21°
21
Overcast
20°
22
Patchy rain possible
12°
23
Mist
15°
24
Overcast
18°
25
Sunny
9°
26
Sunny
13°
27
Sunny
15°
28
Sunny
18°
29
Patchy rain possible
20°
30
Sunny
15°

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

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Overcast
Overcast
 30° /12° 0 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 29° /10° 4.9 mm 6
Sept. 3 Overcast
Overcast
 23° /10° 0.4 mm 5
Sept. 4 Sunny
Sunny
 21° /10° 25.3 mm 5
Sept. 5 Sunny
Sunny
 24° /8° 17.9 mm 5
Sept. 6 Sunny
Sunny
 25° /9° 30.4 mm 5
Sept. 7 Sunny
Sunny
 23° /10° 107.6 mm 5
Sept. 8 Sunny
Sunny
 22° /9° 46.1 mm 5
Sept. 9 Sunny
Sunny
 24° /10° 0 mm 6
Sept. 10 Sunny
Sunny
 24° /10° 1.5 mm 6
Sept. 11 Patchy rain possible
Patchy rain possible
 20° /10° 31.2 mm 4
Sept. 12 Overcast
Overcast
 17° /9° 5 mm 3
Sept. 13 Patchy rain possible
Patchy rain possible
 18° /6° 2.1 mm 4
Sept. 14 Patchy rain possible
Patchy rain possible
 16° /7° 0.9 mm 3
Sept. 15 Overcast
Overcast
 14° /3° 0.7 mm 2.8
Sept. 16 Sunny
Sunny
 19° /3° 0 mm 4.5
Sept. 17 Sunny
Sunny
 24° /4° 0 mm 4.7
Sept. 18 Sunny
Sunny
 23° /7° 0 mm 4.4
Sept. 19 Sunny
Sunny
 21° /7° 0 mm 5.1
Sept. 20 Sunny
Sunny
 21° /7° 0 mm 6
Sept. 21 Overcast
Overcast
 20° /8° 0 mm 4
Sept. 22 Patchy rain possible
Patchy rain possible
 12° /4° 2.1 mm 3
Sept. 23 Mist
Mist
 15° /2° 0 mm 4
Sept. 24 Overcast
Overcast
 18° /4° 0 mm 4
Sept. 25 Sunny
Sunny
 9° /-1° 4.1 mm 3
Sept. 26 Sunny
Sunny
 13° /-3° 0 mm 4
Sept. 27 Sunny
Sunny
 15° /0° 0 mm 5
Sept. 28 Sunny
Sunny
 18° /2° 0 mm 5
Sept. 29 Patchy rain possible
Patchy rain possible
 20° /10° 0.2 mm 5
Sept. 30 Sunny
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.
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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 23° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Glacier National Park during September?
Moderate rainfall is anticipated in Glacier National Park during September, with a total of 50.6 mm spread over approximately 9 days. Considering plans for rainy days is advisable.

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 9 rainy days in September with a total of 50.6 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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Location coordinates Where is Glacier National Park?

Get accurate weather forecasts for Glacier National Park, located at latitude 48.683 and longitude -113.8. Stay updated with localized weather information tailored for Glacier National Park.

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