Great Falls Weather Forecast
- 43
- 69
Rain Showers Likely
- 50
- 76
Chance Rain
- 43
- 68
Chance Rain
- 52
- 81
Partly Sunny
- 47
- 78
Partly Sunny
- 48
- 76
Partly Sunny
Today 7 May Cascade County below 5000ft
Mostly cloudy. Chance of rain Showers until late Afternoon, then chance of Thunderstorms late in the afternoon. Highs 64 to 70. West Winds 5 to 15 Mph. Chance of precipitation 50 percent.
Tonight 7 May Cascade County below 5000ft
Mostly cloudy with chance of rain Showers and slight chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the lower 40s. West Winds 5 to 10 Mph shifting to the southwest after midnight. Chance of precipitation 40 percent.
Great Falls Temperature Statistics
May Temperature
Great Falls, Great Falls International Airport (3.7 miles)
Lowest 1 May, 2026
34.6 °FAverage May
53.1 °FHighest 3 May, 2026
76.6 °F
Climate (2021–Present)
Great Falls, Great Falls International Airport (3.7 miles)
Average Low 2021–2026
34.4 °FAverage 2021–2026
47 °FAverage High 2021–2026
59.1 °F