Gaithersburg Weather Forecast

    • 70
    • 88

    Chance Thunderstorms

    • 61
    • 83

    Partly Sunny

    • 64
    • 79

    Mostly Cloudy

    • 64
    • 83

    Rain Showers Likely

    • 62
    • 75

    Chance Rain Showers

    • 60
    • 73

    Chance Rain Showers

Today 17 Sep Central and Southeast Montgomery

Mostly sunny. A slight chance of Showers in the Morning, then a chance of Showers with a slight chance of Thunderstorms in the afternoon. Highs in the upper 80s. South Winds around 5 Mph. Chance of rain 50 percent.

Tonight 17 Sep Central and Southeast Montgomery

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Lows around 70. West Winds around 5 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Gaithersburg Temperature Statistics

September Temperature

Gaithersburg - Montgomery County Airport (2.5 miles)

  • Lowest 8 September, 2026

    55.4 °F

  • Average September

    74.2 °F

  • Highest 1 September, 2026

    93.9 °F

Climate (2021–2026)

Gaithersburg - Montgomery County Airport (2.5 miles)

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  • Average Low 2021–2026

    46.2 °F

  • Average 2021–2026

    56 °F

  • Average High 2021–2026

    65.9 °F
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