Great Falls weather live forecast

Today's maximum temperature in Great Falls is expected to be 6°C. Select a day from the live weather forecast for Great Falls, Montana, USA for more weather parameters.

Sunday
17th May
6

0

1

3
Monday
18th May
12

0

9

5
Tuesday
19th May
17

0

5

6
Wednesday
20th May
15

4

3

5
Thursday
21st May
17

3

5

5

5-day weather forecast updated at 04:00 on Monday 18th May 2026 GMT

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The 5-day weather forecast for Montana (Great Falls) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Great Falls weather forecast by day

Below are the detailed weather forecasts for Great Falls for the next 5 days.

Great Falls weather for Sunday 17th May 2026

Expect cloudy with sleet or snow in Great Falls, Montana with a maximum temperature of 6°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 10-20 mm of sleet/snow expected with 71% chance of some sleet or snow and a fresh breeze of 31 kph from the north-west.

6
°C maximum temperature
0
°C minimum temperature
cloudy with sleet or snow
1
hour of sunshine
3
UV index (Moderate)
71
% chance of some sleet or snow
<20
mm of sleet/snow expected
1
°C wind chill
31
kph wind from NW

Great Falls weather for Monday 18th May 2026

Expect sunshine and showers in Great Falls, Montana with a maximum temperature of 12°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 5% chance of some rain and a gentle breeze of 13 kph from the north.

12
°C maximum temperature
0
°C minimum temperature
sunshine and showers
9
hours of sunshine
5
UV index (Moderate)
5
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
13
kph wind from N

Great Falls weather for Tuesday 19th May 2026

Expect broken clouds in Great Falls, Montana with a maximum temperature of 17°C, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the south-west.

17
°C maximum temperature
0
°C minimum temperature
broken clouds
5
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
24
kph wind from SW

Great Falls weather for Wednesday 20th May 2026

Expect mostly cloudy with light rain in Great Falls, Montana with a maximum temperature of 15°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 56% chance of some rain and a moderate breeze of 20 kph from the north-west.

15
°C maximum temperature
4
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
5
UV index (Moderate)
56
% chance of some rain
<5
mm of rainfall expected
15
°C wind chill
20
kph wind from NW

Great Falls weather for Thursday 21st May 2026

Expect mostly cloudy with light rain in Great Falls, Montana with a maximum temperature of 17°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 15% chance of some rain and a gentle breeze of 17 kph from the north-west.