Great Falls 7-day weather forecast

Written by:
March 23, 2026
ESOlex // Shutterstock

Great Falls 7-day weather forecast

Stacker created the forecast for Great Falls, Montana using data from OpenWeather. This week's high is 76 °F on Saturday, while the low is 32 °F on Monday. There are expected to be 0 sunny days and rain on 2 days this week.

There are currently no weather alerts.

Monday, May 18

- High of 54 °F, low of 32 °F (50% humidity)
- Overcast with a 0% chance of rain
- High risk of harm from sun exposure (5 UV index)
- Gentle breeze (9 mph wind)
- Sunrise at 5:44 AM, sunset at 8:58 PM
1 / 6
Canva

Tuesday, May 19

- High of 63 °F, low of 37 °F (32% humidity)
- Overcast with a 0% chance of rain
- High risk of harm from sun exposure (6 UV index)
- Fresh breeze (19 mph wind)
- Sunrise at 5:43 AM, sunset at 9:00 PM
2 / 6
alisalipa // Shutterstock

Wednesday, May 20

- High of 56 °F, low of 42 °F (69% humidity)
- Overcast with a 100% chance of rain (6 mm of rain)
- Moderate risk of harm from sun exposure (4 UV index)
- Gentle breeze (11 mph wind)
- Sunrise at 5:42 AM, sunset at 9:01 PM
3 / 6
LeManna // Shutterstock

Thursday, May 21

- High of 61 °F, low of 44 °F (45% humidity)
- Overcast with a 100% chance of rain (1 mm of rain)
- High risk of harm from sun exposure (7 UV index)
- Gentle breeze (9 mph wind)
- Sunrise at 5:41 AM, sunset at 9:02 PM
4 / 6
Cari Rubin Photography // Shutterstock

Friday, May 22

- High of 69 °F, low of 42 °F (32% humidity)
- Mostly cloudy with a 0% chance of rain
- High risk of harm from sun exposure (7 UV index)
- Gentle breeze (12 mph wind)
- Sunrise at 5:40 AM, sunset at 9:03 PM
5 / 6
Valeriy Boyarskiy // Shutterstock

Saturday, May 23

- High of 76 °F, low of 49 °F (30% humidity)
- Mostly cloudy with a 0% chance of rain
- High risk of harm from sun exposure (7 UV index)
- Fresh breeze (24 mph wind)
- Sunrise at 5:39 AM, sunset at 9:04 PM
- First quarter moon
6 / 6
STILLFX // Shutterstock

Sunday, May 24

- High of 75 °F, low of 55 °F (25% humidity)
- Overcast with a 0% chance of rain
- High risk of harm from sun exposure (7 UV index)
- Strong breeze (25 mph wind)
- Sunrise at 5:38 AM, sunset at 9:06 PM

Trending Now