Weather in September 2025

Helena weather in September 2025

The temperatures in Helena in September are quite cold with temperatures between 6°C and 21°C, warm clothes are a must.

You can expect about 3 to 8 days of rain in Helena during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.

Please note that Helena can expect a few days of snow in September.

Our weather forecast can give you a great sense of what weather to expect in Helena in September 2025.

If you’re planning to visit Helena in the near future, we highly recommend that you review the 14 day weather forecast for Helena before you arrive.

Temperatures
Temperatures
21° / 6°
Rainy Days
Rainy Days
3
Snowy Days
Snowy Days
1
Dry Days
Dry Days
26
Rainfall
Rainfall
44
mm
9.6
Sun Hours
9.6
Hrs

Helena annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January -2° / -9° 6 10 16 39 mm
Awful
February -2° / -10° 6 5 18 47 mm
Awful
March 4° / -5° 8 10 15 62 mm
Awful
April 9° / -3° 8 10 12 86 mm
Awful
May 15° / 2° 9 19 3 106 mm
Bad
June 21° / 6° 8 22 0 105 mm
Ok
July 28° / 9° 3 28 0 45 mm
Perfect
August 26° / 10° 3 28 0 49 mm
Perfect
September 21° / 6° 3 26 1 44 mm
Good
October 11° / 0° 4 22 6 51 mm
Bad
November 3° / -6° 3 15 12 38 mm
Awful
December -3° / -10° 6 8 17 37 mm
Awful
Temperatures in Helena in September
Rain in Helena in September

Weather in Helena in September - FAQ

What is the average temperature in Helena in September?
The average temperature in Helena in September is 6/21° C.
What is the chance of rain in Helena in September?
On average, there are 3 rainy days in Helena during September.
Weather wise, is September a good time to visit Helena?
The weather in Helena in September is good.
Can it snow in Helena in September?
On average, there are 1 snowy days in Helena in September.
More about the weather in Helena