Potomac Weather Forecast

    • 57
    • 75

    Slight Chance Rain Showers

    • 57
    • 72

    Chance Rain Showers

    • 57
    • 80

    Partly Sunny

    • 58
    • 81

    Mostly Sunny

    • 59
    • 80

    Partly Sunny

    • 61
    • 83

    Partly Sunny

    • 59
    • 81

    Partly Sunny

Today 9 Sep Central and Southeast Montgomery

Mostly sunny. Highs in the mid 70s. East Winds around 10 Mph.

Tonight 9 Sep Central and Southeast Montgomery

Partly cloudy in the Evening, then mostly cloudy with a slight chance of Showers after midnight. Lows in the upper 50s. Northeast Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Potomac Temperature Statistics

September Temperature

Gaithersburg - Montgomery County Airport (10.6 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    68.9 °F

  • Highest 6 September, 2025

    89.1 °F

Climate (2020–Present)

Gaithersburg - Montgomery County Airport (10.6 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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