Overall on the next 14 days there will be 1 days with snow in Great Falls and a total of 7.6 cm of snow.
It will be snowy on the following days:
Great Falls weather in May 2026
Click on a day for an hourly weather forecast
Friday
May 15
0 mm
17° / 8°
Saturday
May 16
1.5 mm
14° / 5°
Sunday
May 17
7.6 cm
8° / 1°
Monday
May 18
0 mm
12° / -2°
Tuesday
May 19
0 mm
16° / 2°
Wednesday
May 20
0 mm
18° / 5°
Thursday
May 21
0 mm
23° / 7°
Friday
May 22
0 mm
24° / 9°
Saturday
May 23
0 mm
25° / 10°
Sunday
May 24
0 mm
28° / 12°
Monday
May 25
0 mm
26° / 13°
Tuesday
May 26
0 mm
23° / 10°
Wednesday
May 27
0 mm
18° / 5°
Thursday
May 28
0 mm
27° / 7°
🌨️ Snowy days in Great Falls 2026 (May)
The average weather in Great Falls in May
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 2026.
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
Historic average weather for May
Click on a day for an hourly weather forecast
Explore the weather in Great Falls in other months
Great Falls annual weather
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 0° / -7° | 3 | 16 | 12 | 19 mm | Awful | Great Falls in January |
| February | 0° / -8° | 3 | 11 | 15 | 23 mm | Awful | Great Falls in February |
| March | 7° / -3° | 3 | 17 | 11 | 25 mm | Bad | Great Falls in March |
| April | 11° / 1° | 4 | 19 | 7 | 46 mm | Bad | Great Falls in April |
| May | 17° / 5° | 5 | 24 | 2 | 53 mm | Ok | Great Falls in May |
| June | 23° / 9° | 4 | 26 | 0 | 49 mm | Perfect | Great Falls in June |
| July | 29° / 14° | 1 | 30 | 0 | 16 mm | Good | Great Falls in July |
| August | 28° / 14° | 1 | 30 | 0 | 27 mm | Perfect | Great Falls in August |
| September | 23° / 10° | 2 | 28 | 1 | 20 mm | Perfect | Great Falls in September |
| October | 13° / 3° | 3 | 24 | 4 | 30 mm | Bad | Great Falls in October |
| November | 6° / -2° | 3 | 19 | 9 | 20 mm | Awful | Great Falls in November |
| December | -1° / -8° | 2 | 15 | 13 | 18 mm | Awful | Great Falls in December |
Temperatures in Great Falls in May
Rain in Great Falls in May
Weather in Great Falls in May - FAQ
What is the average temperature in Great Falls in May?
The average temperature in Great Falls in May is 5/17° C.
What is the chance of rain in Great Falls in May?
On average, there are 5 rainy days in Great Falls during May.
Weather wise, is May a good time to visit Great Falls?
The weather in Great Falls in May is ok.
Can it snow in Great Falls in May?
On average, there are 2 snowy days in Great Falls in May.
More about the weather in Great Falls