The temperatures in Great Falls in May are quite cold with temperatures between 5°C and 17°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Great Falls during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Please note that Great Falls can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Great Falls in May 2025.
If you’re planning to visit Great Falls in the near future, we highly recommend that you review the 14 day weather forecast for Great Falls before you arrive.
Temperatures
17° / 5°
Rainy Days
5
Snowy Days
2
Dry Days
24
Rainfall
53
mm
Sun Hours
7.2
Hrs
