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

Partly Cloudy

23%

Moderate rain at times

7%

Heavy rain

4%

Weather at 12pm
65°F

Partly Cloudy

24%

Moderate rain at times

8%

Moderate or heavy rain in area with thunder

3%

Weather at 6pm
68°F

Partly Cloudy

23%

Moderate rain at times

8%

Heavy rain

4%

Weather at 3am
50°F

Clear/Sunny

62%

Partly Cloudy

20%

Moderate rain at times

8%

Heavy rain

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.

more information about United States's weather in september


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:

01-09-2024
Clear/Sunny
54°F to 88°F
02-09-2024
Clear/Sunny
58°F to 88°F
03-09-2024
Clear/Sunny
54°F to 74°F
04-09-2024
Clear/Sunny
47°F to 76°F
05-09-2024
Clear/Sunny
49°F to 83°F
06-09-2024
Clear/Sunny
54°F to 85°F
07-09-2024
Clear/Sunny
56°F to 86°F
08-09-2024
Clear/Sunny
56°F to 88°F
09-09-2024
Clear/Sunny
52°F to 81°F
10-09-2024
Overcast
50°F to 77°F
11-09-2024
Clear/Sunny
50°F to 68°F
12-09-2024
Light rain shower
49°F to 50°F
13-09-2024
Patchy rain nearby
45°F to 59°F
14-09-2024
Clear/Sunny
45°F to 70°F
15-09-2024
Partly Cloudy
47°F to 70°F
16-09-2024
Clear/Sunny
47°F to 72°F
17-09-2024
Clear/Sunny
49°F to 61°F
18-09-2024
Moderate rain
45°F to 50°F
19-09-2024
Clear/Sunny
47°F to 65°F
20-09-2024
Clear/Sunny
49°F to 63°F
21-09-2024
Clear/Sunny
41°F to 56°F
22-09-2024
Clear/Sunny
43°F to 65°F
23-09-2024
Clear/Sunny
47°F to 63°F
24-09-2024
Clear/Sunny
49°F to 74°F
25-09-2024
Clear/Sunny
56°F to 79°F
26-09-2024
Clear/Sunny
52°F to 67°F
27-09-2024
Clear/Sunny
49°F to 72°F
28-09-2024
Clear/Sunny
52°F to 76°F
29-09-2024
Clear/Sunny
56°F to 65°F
30-09-2024
Clear/Sunny
34°F to 50°F

Map: other cities in the United States (USA) in september

Cities near Helena (Montana):

Montana in septembertolerable weather
Yellowstone National Park in septembervery bad weather
Glacier National Park (Montana) in septembervery bad weather
Cody (Wyoming) in septembertolerable weather
Grand Teton National Park (Wyoming) in septembervery bad weather
Jackson Hole in septembervery bad weather
Boise (Idaho) in septemberperfect weather
Wyoming in septembergood weather
Salt Lake City in septembergood weather
Mount Rushmore in septembergood weather
Mount Rainier National Park (Washington) in septembertolerable weather
Seattle in septemberperfect weather
United States in september: See full list of cities

Click over cities on the map for information about the weather in september.

Legend: 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).


Weather in august in Helena (Montana)
Weather in october in Helena (Montana)
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