Loch Lomond Weather Forecast

    • 68
    • 90

    Chance Thunderstorms

    • 66
    • 82

    Chance Rain Showers

    • 68
    • 84

    Rain Showers Likely

    • 67
    • 87

    Slight Chance Thunderstorms

    • 59
    • 83

    Partly Sunny

    • 63
    • 82

    Partly Sunny

    • 64
    • 87

    Chance Rain Showers

Today 10 Sep Northwest Prince William

Partly sunny. Highs in the upper 80s. West Winds around 5 Mph.

Tonight 10 Sep Northwest Prince William

Mostly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the upper 60s. Northwest Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Loch Lomond Temperature Statistics

September Temperature

Manassas, Manassas Regional Airport/Harry P. Davis Field (5 miles)

  • Lowest 8 September, 2026

    55 °F

  • Average September

    75.6 °F

  • Highest 1 September, 2026

    96.1 °F

Climate (2021–2026)

Manassas, Manassas Regional Airport/Harry P. Davis Field (5 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    57.1 °F

  • Average High 2021–2026

    68.1 °F
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