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.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Gaithersburg Temperature Statistics

September Temperature

Gaithersburg - Montgomery County Airport (2.5 miles)

  • Lowest 9 September, 2025

    48.2 °F

  • Average September

    67.4 °F

  • Highest 6 September, 2025

    89.1 °F

Climate (2020–Present)

Gaithersburg - Montgomery County Airport (2.5 miles)

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  • Average Low 2020–2025

    46.3 °F

  • Average 2020–2025

    56 °F

  • Average High 2020–2025

    65.9 °F
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