Washington Lake Weather Forecast

    • 37
    • 53

    Mostly Cloudy

    • 37
    • 57

    Partly Sunny

    • 45
    • 62

    Partly Sunny

    • 54
    • 72

    Partly Sunny

    • 49
    • 72

    Partly Sunny

    • 47
    • 68

    Partly Sunny

Today 5 Sep Mahnomen

Mostly cloudy with a 20 percent chance of Showers. Highs in the mid 50s. Breezy. Northwest Winds 15 to 25 Mph.

Tonight 5 Sep Mahnomen

Mostly cloudy. Lows in the mid 30s. Northwest Winds 5 to 15 Mph.

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Washington Lake Temperature Statistics

September Temperature

Fosston, Fosston Municipal Airport (14.9 miles)

  • Lowest 3 September, 2025

    41 °F

  • Average September

    57.9 °F

  • Highest 1 September, 2025

    75.2 °F

Climate (2020–Present)

Fosston, Fosston Municipal Airport (14.9 miles)

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  • Average Low 2020–2025

    30.1 °F

  • Average 2020–2025

    40 °F

  • Average High 2020–2025

    49.3 °F
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