Gaithersburg Weather Forecast

    • 70
    • 89

    Rain Showers Likely

    • 63
    • 82

    Chance Rain Showers

    • 60
    • 80

    Mostly Sunny

    • 60
    • 80

    Mostly Sunny

    • 63
    • 83

    Partly Sunny

    • 69
    • 86

    Partly Sunny

Today 4 Sep Central and Southeast Montgomery

Mostly sunny. A chance of Showers and Thunderstorms in the afternoon. Highs in the upper 80s. Northwest Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 4 Sep Central and Southeast Montgomery

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows around 70. Northwest Winds around 5 Mph. Chance of rain 50 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Gaithersburg Temperature Statistics

September Temperature

Gaithersburg - Montgomery County Airport (2.5 miles)

  • Lowest 1 September, 2026

    73.4 °F

  • Average September

    82.3 °F

  • Highest 1 September, 2026

    93.9 °F

Climate (2021–2026)

Gaithersburg - Montgomery County Airport (2.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    46.2 °F

  • Average 2021–2026

    56 °F

  • Average High 2021–2026

    65.9 °F
Get WillyWeather+ to remove ads