Montana in september: average Weather, Temperature and Climate
Weather in Montana in september 2025
The weather in Montana in september comes from statistical datas on the last years. You can view the weather statistics for the whole month, but also by clicking on the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
tolerable weather 220.9cm
Weather at 6am
43°F
Clear/Sunny
53% of time
21%
9%
7%
Weather at 12pm
63°F
Clear/Sunny
53% of time
26%
8%
6%
Weather at 6pm
61°F
Clear/Sunny
54% of time
22%
9%
6%
Weather at 3am
45°F
55%
23%
11%
7%
Evolution of daily average temperature and precipitation in Montana in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Montana in september.
The climate of Montana in september is tolerable
The climate in september in Montana is relatively dry (with 3.2in of precipitation over 4 days). This is better than the previous month since in august it receives an average of 4.4in of rainfall over 7 days.
The climate is rather cold in that locality this month, but it is tolerable by dressing warm. The high seasonal norm is 65°F. The minimum is 43°F. Thus, the mean temperature average on this month of september in Montana is 54°F. Note that these seasonal averages are in contrast with those observed in Montana in the month of september with a maximum record of 86°F in 2013 and a minimum record of 11°F in 2019. You can hope to have about 17 days with temperatures over 65°F, or 57% of the month.
On this month of september, day length in Montana is generally 12:32. Sunrise is at 06:00 and sets at 18:32.
With a good weather, the month of september is a good month to go in that area in United States.
Montana: another month?
If you can push the dates of your trip to Montana forward, the month of october has a better weather forecast than september. more information
September: another location in the United States (USA)?
If you want to go to the United States (USA) in september, there are destinations with better weather than Montana:
In september, Grand Canyon, Hawaii (Honolulu), Las Vegas, Seattle, Denver and Minneapolis (Minnesota) have perfect weather.
Furthermore, California, Louisiana, Washington D. C., Atlanta, Boston and Chicago have good weather.
Seasonal average climate and temperature of Montana in september
Check below seasonal norms These statistics are set from the weather statements earlier years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 54°F | ||||
| Highest temperature | 65°F | ||||
| Lowest temperature | 43°F | ||||
| Highest record temperature | 86°F (2013) | ||||
| Lowest record temperature | 11°F (2019) | ||||
| Number of days at +86°F | 0 day(s) (0%) | ||||
| Number of days at +65°F | 17 day(s) (57%) | ||||
| Number of days at -32°F | 3 day(s) (10%) | ||||
| Wind | |||||
| Wind speed | 18km/h | ||||
| Wind temperature | 40°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.2in | ||||
| Number of days with rainfall | 4 day(s) (15%) | ||||
| Record daily rainfall | 1.8in (2017) | ||||
| Snowfall | 220.9cm | ||||
| Other climate data | |||||
| Humidity | 71% | ||||
| Visibility | 9.3km | ||||
| Cloud cover | 24% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:00 | ||||
| Time of sunset | 18:32 | ||||
| Length of day | 12:32 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | tolerable | ||||
How was the weather last september?
Here is the day by day recorded weather in Montana in september 2024:
50°F to 85°F
59°F to 85°F
58°F to 76°F
52°F to 68°F
47°F to 79°F
52°F to 83°F
56°F to 85°F
56°F to 85°F
58°F to 79°F
56°F to 77°F
54°F to 70°F
50°F to 58°F
45°F to 58°F
49°F to 70°F
49°F to 74°F
52°F to 76°F
54°F to 68°F
45°F to 49°F
41°F to 67°F
43°F to 65°F
31°F to 54°F
36°F to 67°F
47°F to 63°F
45°F to 74°F
49°F to 81°F
47°F to 70°F
45°F to 76°F
50°F to 72°F
49°F to 76°F
34°F to 50°F
Map: other cities in the United States (USA) in september
Cities near Montana:
| Helena (Montana) in september | tolerable weather |
| Yellowstone National Park in september | very bad weather |
| Cody (Wyoming) in september | tolerable weather |
| Glacier National Park (Montana) in september | very bad weather |
| Grand Teton National Park (Wyoming) in september | very bad weather |
| Jackson Hole in september | very bad weather |
| Wyoming in september | good weather |
| Boise (Idaho) in september | perfect weather |
| Mount Rushmore in september | good weather |
| Salt Lake City in september | good weather |
| North Dakota in september | good weather |
| Utah in september | perfect weather |
Click over cities on the map for information about the weather in september.
Montana
perfect weather
good
tolerable
bad
very bad
Weather data for Montana in september:
Weather data for Montana for september are derived from an average of the weather forecast since 2009 in Montana. There is a margin of error and these forecasts are to be considered as general information only. The weather in Montana can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Montana.