Lake Manassas Weather Forecast

    • 59
    • 70

    Chance Rain Showers

    • 61
    • 67

    Rain Showers Likely

    • 59
    • 82

    Partly Sunny

    • 59
    • 88

    Mostly Sunny

    • 59
    • 81

    Partly Sunny

    • 58
    • 78

    Partly Sunny

Today 16 Sep Southern Fauquier

Cloudy with a 50 percent chance of Showers. Highs in the upper 60s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 16 Sep Southern Fauquier

A slight chance of Thunderstorms in the evening. Cloudy with a chance of Showers. Lows in the upper 50s. North Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

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Lake Manassas Temperature Statistics

September Temperature

Manassas, Manassas Regional Airport/Harry P. Davis Field (7.5 miles)

  • Lowest 8 September, 2025

    44.1 °F

  • Average September

    67.4 °F

  • Highest 6 September, 2025

    91 °F

Climate (2020–Present)

Manassas, Manassas Regional Airport/Harry P. Davis Field (7.5 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57 °F

  • Average High 2020–2025

    68 °F
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