Fish Lake Weather Forecast

    • 56
    • 65

    Rain Showers Likely

    • 56
    • 64

    Rain Showers

    • 55
    • 66

    Chance Rain Showers

    • 55
    • 73

    Slight Chance Thunderstorms

    • 50
    • 72

    Partly Sunny

    • 50
    • 70

    Mostly Sunny

Today 18 Sep Mahnomen

Showers and a slight chance of Thunderstorms in the Morning, then a chance of Showers and Thunderstorms in the afternoon. Highs in the mid 60s. East Winds 10 to 20 Mph. Chance of rain 80 percent.

Tonight 18 Sep Mahnomen

Cloudy with a 40 percent chance of Showers. Lows in the mid 50s. Northeast Winds around 10 Mph.

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Fish Lake Temperature Statistics

September Temperature

Mahnomen County Airport (3.7 miles)

  • Lowest 7 September, 2025

    34 °F

  • Average September

    59.5 °F

  • Highest 14 September, 2025

    82.4 °F

Climate (2020–Present)

Mahnomen County Airport (3.7 miles)

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  • Average Low 2020–2025

    32.2 °F

  • Average 2020–2025

    41.9 °F

  • Average High 2020–2025

    51.1 °F
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