Helena (Montana) in september: average Weather, Temperature and Climate
Weather in Helena (Montana) in september 2025
The weather in Helena (Montana) in september comes from statistical datas on the past years. You can view the weather statistics the entire 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 53.8cm
Weather at 6am
45°F
Clear/Sunny
59% of time
23%
7%
4%
Weather at 12pm
65°F
Clear/Sunny
64% of time
24%
8%
3%
Weather at 6pm
68°F
Clear/Sunny
61% of time
23%
8%
4%
Weather at 3am
50°F
62%
20%
8%
5%
Evolution of daily average temperature and precipitation in Helena (Montana) in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Helena (Montana) in september.
The climate of Helena (Montana) in september is tolerable
The climate in september in Helena (Montana) is rather dry (with 1.8in of rainfall over 3 days). The weather is better from the previous month since in august it receives an average of 2in of rainfall over 3 days.
The climate quite nice in this location september. The high seasonal norm is 70°F. The minimum is 45°F. Thus, the mean temperature average in september in Helena (Montana) is 58°F. Note that seasonal normals in contrast with those observed in Helena (Montana) in the month of september with a maximum record of 94°F in 2020 and a minimum record of 14°F in 2019. You can expect to have about 3 days with temperatures under 32°F, or 10% of time.
Day length in Helena (Montana) in september is 12:33. Sunrise is at 06:06 and sets at 18:39.
With a correct weather, the month of september is okay (but not the best) to go in this locality in United States.
Helena (Montana): another month?
If you can push the dates of your trip to Helena (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 Helena (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 Helena (Montana) in september
Check below seasonal norms These datas are generated from the weather statements earlier years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 58°F | ||||
| Highest temperature | 70°F | ||||
| Lowest temperature | 45°F | ||||
| Highest record temperature | 94°F (2020) | ||||
| Lowest record temperature | 14°F (2019) | ||||
| Number of days at +86°F | 1 day(s) (3%) | ||||
| Number of days at +65°F | 22 day(s) (73%) | ||||
| Number of days at -32°F | 3 day(s) (10%) | ||||
| Wind | |||||
| Wind speed | 15km/h | ||||
| Wind temperature | 41°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 1.8in | ||||
| Number of days with rainfall | 3 day(s) (10%) | ||||
| Record daily rainfall | 1in (2017) | ||||
| Snowfall | 53.8cm | ||||
| Other climate data | |||||
| Humidity | 68% | ||||
| Visibility | 9.61km | ||||
| Cloud cover | 20% | ||||
| UV index | 5 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:06 | ||||
| Time of sunset | 18:39 | ||||
| Length of day | 12:33 | ||||
| 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 Helena (Montana) in september 2024:
54°F to 88°F
58°F to 88°F
54°F to 74°F
47°F to 76°F
49°F to 83°F
54°F to 85°F
56°F to 86°F
56°F to 88°F
52°F to 81°F
50°F to 77°F
50°F to 68°F
49°F to 50°F
45°F to 59°F
45°F to 70°F
47°F to 70°F
47°F to 72°F
49°F to 61°F
45°F to 50°F
47°F to 65°F
49°F to 63°F
41°F to 56°F
43°F to 65°F
47°F to 63°F
49°F to 74°F
56°F to 79°F
52°F to 67°F
49°F to 72°F
52°F to 76°F
56°F to 65°F
34°F to 50°F
Map: other cities in the United States (USA) in september
Cities near Helena (Montana):
| Montana in september | tolerable weather |
| Yellowstone National Park in september | very bad weather |
| Glacier National Park (Montana) in september | very bad weather |
| Cody (Wyoming) in september | tolerable weather |
| Grand Teton National Park (Wyoming) in september | very bad weather |
| Jackson Hole in september | very bad weather |
| Boise (Idaho) in september | perfect weather |
| Wyoming in september | good weather |
| Salt Lake City in september | good weather |
| Mount Rushmore in september | good weather |
| Mount Rainier National Park (Washington) in september | tolerable weather |
| Seattle in september | perfect weather |
Click over cities on the map for information about the weather in september.
Helena (Montana)
perfect weather
good
tolerable
bad
very bad
Weather data for Helena (Montana) in september:
Weather data for Helena (Montana) for september are derived from an average of the weather forecast since 2009 in Helena (Montana). There is a margin of error and these forecasts are to be considered as general information only. The weather in Helena (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 Helena (Montana).