The temperatures in Butte in September are quite cold with temperatures between 5°C and 19°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Butte 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 Butte can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Butte in September 2025.
If you’re planning to visit Butte in the near future, we highly recommend that you review the 14 day weather forecast for Butte before you arrive.
Temperatures
19° / 5°
Rainy Days
3
Snowy Days
1
Dry Days
26
Rainfall
48
mm
Sun Hours
9.4
Hrs
