Weather in Great Falls in September
The weather in Great Falls in September is cold, when degrees are between 6 and 24 and there are 9 days of rain and 1 days of snow in average. Therefore, if you are planning a trip to Great Falls in September, warm clothes and gloves are highly recommended.
Avg Temp
6° - 24°
Avg Rainy Days
9
Avg Dry Days
21
Avg Snow Days
1
Weather Facts - Great Falls in September
* The warmest temperature recorded in in September is 37°C
* The coldest temperature recorded in Great Falls in September is (-9°C)
* The average rainfall in Great Falls in September is 32 mm