Summer temperatures · Montana
How hot does Great Falls get in summer?
In a typical summer, June to August, Great Falls averages highs around 80°F and lows around 49°F.
About 22 days a year reach 90°F or hotter, and about one reaches 100°F. About 64 days a year get to 80°F or warmer. That makes it the 8th coolest summer of the 129 US cities we track.
Last updated
The hottest high in the forecast for the next 48 hours is about 60°F.
Great Falls averages summer highs around 80°F and lows around 49°F, which means warm afternoons and evenings that remember this is Montana.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer at a glance
| Average summer high | 80°F |
|---|---|
| Average summer low | 49°F |
| Days a year at 80°F or warmer | 64 |
| Days a year at 90°F or hotter | 22 |
| Days a year at 100°F or hotter | 1 |
| Average winter high, for comparison | 36°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Duluth, Minnesota: highs around 75°F, lows around 54°F
- Flagstaff, Arizona: highs around 80°F, lows around 48°F
- Missoula, Montana: highs around 81°F, lows around 49°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00024143.