Potomac Weather Forecast

    • 71
    • 86

    Chance Thunderstorms

    • 71
    • 88

    Partly Sunny

    • 68
    • 84

    Rain Showers Likely

    • 69
    • 85

    Slight Chance Thunderstorms

    • 72
    • 87

    Chance Thunderstorms

    • 69
    • 87

    Chance Rain Showers

    • 68
    • 86

    Mostly Sunny

Today 12 Aug Central and Southeast Montgomery

Partly sunny. Highs in the mid 80s. Northwest Winds around 5 Mph.

Tonight 12 Aug Central and Southeast Montgomery

Mostly cloudy with a chance of Showers and Thunderstorms. Lows around 70. Southwest Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Potomac Temperature Statistics

August Temperature

Gaithersburg - Montgomery County Airport (10.6 miles)

  • Lowest 1 August, 2026

    64.4 °F

  • Average August

    77.9 °F

  • Highest 6 August, 2026

    91.9 °F

Climate (2021–2026)

Gaithersburg - Montgomery County Airport (10.6 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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