Decker Lake Weather Forecast

    • 59
    • 80

    Decreasing Clouds

    • 54
    • 79

    Mostly Sunny

    • 60
    • 78

    Sunny

    • 62
    • 82

    Chance Thunderstorms

    • 51
    • 73

    Partly Sunny

    • 52
    • 65

    Rain Showers Likely

    • 52
    • 66

    Chance Thunderstorms

Today 8 Sep Le Sueur

Mostly cloudy with a 20 percent chance of Thunderstorms. Near steady temperature in the upper 70s. Southwest Winds 10 to 15 Mph.

Tonight 8 Sep Le Sueur

Mostly clear. Patchy fog early in the morning. Lows in the upper 50s. Southwest Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Decker Lake Temperature Statistics

September Temperature

Mankato, Mankato Regional Airport (10.6 miles)

  • Lowest 1 September, 2026

    62.1 °F

  • Average September

    75 °F

  • Highest 4 September, 2026

    90 °F

Climate (2021–2026)

Mankato, Mankato Regional Airport (10.6 miles)

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  • Average Low 2021–2026

    39.4 °F

  • Average 2021–2026

    48.3 °F

  • Average High 2021–2026

    57.2 °F
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