Colonial Beach Weather Forecast

    • 75
    • 81

    Rain Showers

    • 74
    • 83

    Chance Rain Showers

    • 64
    • 78

    Partly Sunny

    • 67
    • 77

    Mostly Sunny

    • 69
    • 78

    Mostly Sunny

    • 71
    • 81

    Mostly Sunny

    • 72
    • 82

    Slight Chance Rain Showers

Today 12 Sep Westmoreland

Mostly cloudy with a chance of Showers and Thunderstorms. Highs in the lower 80s. Southeast Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 12 Sep Westmoreland

Showers with a chance of Thunderstorms early this Evening, then Showers likely with a slight chance of Thunderstorms. Lows around 70. Southeast Winds 5 to 10 Mph, becoming south. Chance of rain 80 percent.

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Colonial Beach Temperature Statistics

September Temperature

St Marys County Airport (22.4 miles)

  • Lowest 8 September, 2026

    59.5 °F

  • Average September

    76.3 °F

  • Highest 1 September, 2026

    93.9 °F

Climate (2021–2026)

St Marys County Airport (22.4 miles)

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  • Average Low 2021–2026

    49.5 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    67 °F
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