Great Falls Weather Forecast
- 48
- 71
Chance Rain Showers
- 43
- 69
Rain Showers Likely
- 49
- 76
Chance Rain
- 43
- 65
Chance Rain
- 52
- 81
Partly Sunny
- 47
- 78
Partly Sunny
- 48
- 76
Partly Sunny
Today 6 May Cascade County below 5000ft
Warmer, sunny. Highs in the upper 60s. West Winds 10 to 15 Mph with Gusts to around 30 Mph.
Tonight 6 May Cascade County below 5000ft
Not as cool. Mostly cloudy. Slight chance of Thunderstorms in the Evening, then chance of rain Showers and slight chance of Thunderstorms after midnight. Lows in the upper 40s. West Winds 5 to 15 Mph. Gusts up to 30 Mph in the evening. Chance of precipitation 50 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