❮
Today Hourly 7 days 30 days September
❯

September 2026 Weather | Great Falls, Montana

Today 9/1
Sunny Weather
Day 84°
Night 61°
0
Wed 9/2
Rainy Weather
Day 81°
Night 52°
92
Thu 9/3
Partly Sunny with Showers
Day 75°
Night 48°
60
Fri 9/4
Partly Sunny with Showers
Day 73°
Night 45°
80
Sat 9/5
Cloudy Weather
Day 70°
Night 46°
55
Sun 9/6
Rainy Weather
Day 75°
Night 50°
74
Mon 9/7
Sunny with a Chance of Thunderstorms
Day 75°
Night 50°
70
Tue 9/8
Cloudy Weather
Day 75°
Night 48°
7
Wed 9/9
Sunny Weather
Day 73°
Night 52°
1
Thu 9/10
Cloudy Weather
Day 73°
Night 52°
3
Fri 9/11
Sunny Weather
Day 75°
Night 50°
2
Sat 9/12
Cloudy Weather
Day 73°
Night 45°
2
Sun 9/13
Cloudy Weather
Day 72°
Night 46°
10
Mon 9/14
Sunny Weather
Day 68°
Night 37°
5
Tue 9/15
Sunny Weather
Day 79°
Night 50°
5
Wed 9/16
Sunny Weather
Day 79°
Night 48°
Thu 9/17
Sunny Weather
Day 66°
Night 46°
Fri 9/18
Cloudy Weather
Day 64°
Night 46°
Sat 9/19
Cloudy Weather
Day 73°
Night 46°
Sun 9/20
Cloudy Weather
Day 75°
Night 48°
Mon 9/21
Sunny Weather
Day 66°
Night 45°
Tue 9/22
Cloudy Weather
Day 72°
Night 45°
0
Wed 9/23
Cloudy Weather
Day 75°
Night 48°
0
Thu 9/24
Cloudy Weather
Day 73°
Night 46°
0
Fri 9/25
Cloudy Weather
Day 61°
Night 45°
Sat 9/26
Cloudy Weather
Day 72°
Night 46°
0
Sun 9/27
Cloudy Weather
Day 73°
Night 46°
0
Mon 9/28
Sunny Weather
Day 72°
Night 46°
1
Tue 9/29
Sunny Weather
Day 70°
Night 45°
2
Wed 9/30
Sunny Weather
Day 72°
Night 45°
49

Explore U.S. Weather Trends

❄️ Coldest Cities in the U.S. – Live Temperature Rankings 🔥 Hottest Cities Today – Real-Time Heat Observations ⚠️ Active Weather Alerts – Warnings, Watches & Advisories 🌪️ Windiest Cities – Highest Sustained Wind Speeds 🌫️ Worst Air Quality – Cities with the Highest AQI 🍃 Best Air Quality – Cities with the Lowest AQI