Great Falls weather live forecast

Today's maximum temperature in Great Falls is expected to be 12°C. Select a day from the live weather forecast for Great Falls, Montana, USA for more weather parameters.

Sunday
13th Sep
12

5

1

5
Monday
14th Sep
15

5

4

5
Tuesday
15th Sep
19

3

11

5

5-day weather forecast updated at 04:00 on Thursday 10th 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 Sunday 13th September 2026

Expect mostly cloudy with rain in Great Falls, Montana with a maximum temperature of 12°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 84% chance of some rain and a moderate breeze of 23 kph from the north-east.

12
°C maximum temperature
5
°C minimum temperature
mostly cloudy with rain
1
hour of sunshine
5
UV index (Moderate)
84
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
23
kph wind from NE

Great Falls weather for Monday 14th September 2026

Expect mostly cloudy with light rain in Great Falls, Montana with a maximum temperature of 15°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 17% chance of some rain and a moderate breeze of 21 kph from the south-west.

15
°C maximum temperature
5
°C minimum temperature
mostly cloudy with light rain
4
hours of sunshine
5
UV index (Moderate)
17
% chance of some rain
<2
mm of rainfall expected
15
°C wind chill
21
kph wind from SW

Great Falls weather for Tuesday 15th September 2026

Expect scattered clouds in Great Falls, Montana with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south.