Blackwater Lake Weather Forecast

    • 43
    • 72

    Decreasing Clouds

    • 41
    • 64

    Mostly Cloudy

    • 44
    • 65

    Mostly Cloudy

    • 40
    • 69

    Slight Chance Rain Showers

    • 40
    • 66

    Partly Sunny

    • 41
    • 70

    Slight Chance Rain Showers

Today 11 Sep Western McLean

Mostly sunny. Cooler. Highs around 70. North Winds 10 to 20 Mph with Gusts up to 30 Mph.

Tonight 11 Sep Western McLean

Partly cloudy. Lows in the mid 50s. North Winds around 10 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Blackwater Lake Temperature Statistics

September Temperature

Garrison (17.4 miles)

  • Lowest 1 September, 2026

    50.6 °F

  • Average September

    70.9 °F

  • Highest 4 September, 2026

    91.7 °F

Climate (2021–2026)

Garrison (17.4 miles)

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  • Average Low 2021–2026

    31.3 °F

  • Average 2021–2026

    42.6 °F

  • Average High 2021–2026

    54.1 °F
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