Great Falls weather live forecast

Today's maximum temperature in Great Falls is expected to be 15°C. Select a day from the live weather forecast for Great Falls, Montana, USA for more weather parameters.

Monday
7th Sep
15

10

0

1
Tuesday
8th Sep
17

9

3

1
Wednesday
9th Sep
23

7

13

6
Thursday
10th Sep
25

11

12

5
Friday
11th Sep
21

9

11

5

5-day weather forecast updated at 04:00 on Sunday 6th 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 Monday 7th September 2026

Expect isolated thunderstorms in Great Falls, Montana with a maximum temperature of 15°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 20-30 mm of rainfall expected with 93% chance of some rain and a fresh breeze of 35 kph from the south-west.

15
°C maximum temperature
10
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
1
UV index (Low)
93
% chance of some rain
<30
mm of rainfall expected
15
°C wind chill
35
kph wind from SW

Great Falls weather for Tuesday 8th September 2026

Expect mostly cloudy with rain in Great Falls, Montana with a maximum temperature of 17°C, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 52% chance of some rain and a moderate breeze of 28 kph from the south-west.

17
°C maximum temperature
9
°C minimum temperature
mostly cloudy with rain
3
hours of sunshine
1
UV index (Low)
52
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
28
kph wind from SW

Great Falls weather for Wednesday 9th September 2026

Expect clear skies in Great Falls, Montana with a maximum temperature of 23°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 27 kph from the south-west.

23
°C maximum temperature
7
°C minimum temperature
clear skies
13
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
27
kph wind from SW

Great Falls weather for Thursday 10th September 2026

Expect scattered clouds 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 fresh breeze of 33 kph from the south-west.

25
°C maximum temperature
11
°C minimum temperature
scattered clouds
12
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
33
kph wind from SW

Great Falls weather for Friday 11th September 2026

Expect sunshine and showers in Great Falls, Montana with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 35% chance of some rain and a moderate breeze of 20 kph from the north.