Washington Lake Weather Forecast

    • 48
    • 69

    Decreasing Clouds

    • 41
    • 65

    Mostly Cloudy

    • 38
    • 65

    Mostly Sunny

    • 41
    • 65

    Mostly Sunny

    • 46
    • 67

    Partly Sunny

    • 50
    • 69

    Partly Sunny

Today 19 Sep Mahnomen

Mostly cloudy. Highs 65 to 70. Northeast Winds 5 to 15 Mph.

Tonight 19 Sep Mahnomen

Mostly cloudy. Lows 45 to 50. Northeast Winds 5 to 15 Mph.

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Washington Lake Temperature Statistics

September Temperature

Fosston, Fosston Municipal Airport (14.9 miles)

  • Lowest 13 September, 2026

    37.9 °F

  • Average September

    59.2 °F

  • Highest 10 September, 2026

    81.5 °F

Climate (2021–2026)

Fosston, Fosston Municipal Airport (14.9 miles)

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  • Average Low 2021–2026

    29.6 °F

  • Average 2021–2026

    39.4 °F

  • Average High 2021–2026

    48.7 °F
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