Gaithersburg Weather Forecast
- 58
- 82
Sunny
- 60
- 86
Mostly Sunny
- 62
- 77
Mostly Cloudy
- 61
- 75
Mostly Cloudy
- 63
- 79
Partly Sunny
- 64
- 84
Mostly Cloudy
- 62
- 81
Slight Chance Rain Showers
Today 18 Sep Central and Southeast Montgomery
Sunny. Highs in the lower 80s. West Winds around 5 Mph.
Tonight 18 Sep Central and Southeast Montgomery
Clear. Lows in the upper 50s. Southwest Winds around 5 Mph.
Gaithersburg Temperature Statistics
September Temperature
Gaithersburg - Montgomery County Airport (2.5 miles)
Lowest 9 September, 2025
48.2 °FAverage September
67.4 °FHighest 6 September, 2025
89.1 °F
Climate (2020–Present)
Gaithersburg - Montgomery County Airport (2.5 miles)
Average Low 2020–2025
46.3 °FAverage 2020–2025
56 °FAverage High 2020–2025
65.9 °F