Great Falls Weather Forecast
- 71
- 90
Severe Tstms
- 63
- 84
Chance Thunderstorms
- 61
- 79
Mostly Sunny
- 64
- 81
Partly Sunny
- 66
- 82
Partly Sunny
- 69
- 86
Slight Chance Thunderstorms
Today 21 Jul Central and Southeast Montgomery
Mostly cloudy. A chance of Showers and Thunderstorms in the Morning, then Showers and Thunderstorms in the afternoon. Some Thunderstorms may be severe with damaging Winds and large hail in the afternoon. Highs around 90. South Winds 10 to 15 Mph. Chance of rain 80 percent.
Tonight 21 Jul Central and Southeast Montgomery
Showers and Thunderstorms likely. Some Thunderstorms may produce damaging Winds and large hail in the evening. Lows in the lower 70s. Southwest Winds 10 to 15 Mph. Chance of rain 70 percent.
Great Falls Temperature Statistics
July Temperature
Washington/Dulles International Airport, DC (9.3 miles)
Lowest 13 July, 2026
62.7 °FAverage July
81.4 °FHighest 4 July, 2026
99.6 °F
Climate (2021–2026)
Washington/Dulles International Airport, DC (9.3 miles)
Average Low 2021–2026
47.6 °FAverage 2021–2026
58.2 °FAverage High 2021–2026
68.6 °F