Decker Lake Weather Forecast

    • 66
    • 87

    Mostly Sunny

    • 64
    • 89

    Mostly Sunny

    • 62
    • 84

    Rain Showers Likely

    • 61
    • 76

    Chance Thunderstorms

    • 58
    • 73

    Chance Thunderstorms

    • 57
    • 72

    Chance Rain Showers

    • 58
    • 75

    Slight Chance Rain Showers

Today 15 Sep Le Sueur

Sunny. Highs in the mid 80s. South Winds 10 to 15 Mph.

Tonight 15 Sep Le Sueur

Increasing Clouds. Lows in the mid 60s. South Winds 5 to 15 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 4 September, 2025

    41 °F

  • Average September

    61.8 °F

  • Highest 13 September, 2025

    90 °F

Climate (2020–Present)

Mankato, Mankato Regional Airport (10.6 miles)

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  • Average Low 2020–2025

    39.2 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    56.8 °F
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