Great Falls Weather Forecast
- 62
- 84
Rain Showers Likely
- 69
- 87
Mostly Sunny
- 59
- 88
Rain Showers Likely
- 53
- 72
Partly Sunny
- 51
- 72
Partly Sunny
- 53
- 75
Mostly Cloudy
Today 4 Sep Central and Southeast Montgomery
Sunny. A chance of Showers and Thunderstorms this afternoon. Highs in the mid 80s. South Winds 10 to 15 Mph. Chance of rain 50 percent.
Tonight 4 Sep Central and Southeast Montgomery
Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the lower 60s. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent.
Great Falls Temperature Statistics
September Temperature
Washington/Dulles International Airport, DC (9.3 miles)
Lowest 1 September, 2025
50 °FAverage September
66.2 °FHighest 1 September, 2025
80.1 °F
Climate (2020–Present)
Washington/Dulles International Airport, DC (9.3 miles)
Average Low 2020–2025
47.8 °FAverage 2020–2025
58.2 °FAverage High 2020–2025
68.5 °F