Island Lake Weather Forecast

    • 35
    • 54

    Partly Sunny

    • 40
    • 52

    Rain Showers

    • 39
    • 55

    Mostly Cloudy

    • 37
    • 58

    Partly Sunny

    • 45
    • 62

    Partly Sunny

    • 51
    • 70

    Slight Chance Thunderstorms

    • 53
    • 72

    Partly Sunny

Today 3 Sep Mahnomen

Partly sunny with isolated Showers. Highs in the mid 50s. North Winds around 15 Mph. Chance of rain 20 percent.

Tonight 3 Sep Mahnomen

Mostly cloudy. Patchy frost after midnight. Lows in the mid 30s. Northwest Winds 5 to 15 Mph.

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Island Lake Temperature Statistics

September Temperature

Fosston, Fosston Municipal Airport (11.2 miles)

  • Lowest 1 September, 2025

    55.4 °F

  • Average September

    65.7 °F

  • Highest 1 September, 2025

    75.2 °F

Climate (2020–Present)

Fosston, Fosston Municipal Airport (11.2 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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