Great Falls weather live forecast

Today's maximum temperature in Great Falls is expected to be 18°C. Select a day from the live weather forecast for Great Falls, Montana, USA for more weather parameters.

Saturday
19th Sep
18

11

1

4
Sunday
20th Sep
23

8

12

5
Monday
21st Sep
25

8

12

5
Tuesday
22nd Sep
25

9

9

5
Wednesday
23rd Sep
26

10

9

5

5-day weather forecast updated at 04:00 on Saturday 19th September 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 Saturday 19th September 2026

Expect broken clouds in Great Falls, Montana with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the north-east.

18
°C maximum temperature
11
°C minimum temperature
broken clouds
1
hour of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
13
kph wind from NE

Great Falls weather for Sunday 20th September 2026

Expect scattered clouds in Great Falls, Montana with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the south.

23
°C maximum temperature
8
°C minimum temperature
scattered clouds
12
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
23
°C wind chill
12
kph wind from S

Great Falls weather for Monday 21st September 2026

Expect clear skies in Great Falls, Montana with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south.

25
°C maximum temperature
8
°C minimum temperature
clear skies
12
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
14
kph wind from S

Great Falls weather for Tuesday 22nd September 2026

Expect scattered clouds in Great Falls, Montana with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-west.

25
°C maximum temperature
9
°C minimum temperature
scattered clouds
9
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
13
kph wind from SW

Great Falls weather for Wednesday 23rd September 2026

Expect scattered clouds in Great Falls, Montana with a maximum temperature of 26°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the south-west.