Decker Lake Weather Forecast

    • 60
    • 79

    Isolated Thunderstorms

    • 62
    • 82

    Mostly Sunny

    • 65
    • 85

    Chance Thunderstorms

    • 72
    • 85

    Slight Chance Thunderstorms

    • 71
    • 88

    Rain Showers

    • 64
    • 82

    Rain Showers Likely

    • 61
    • 80

    Slight Chance Thunderstorms

Today 30 Jun Le Sueur

Mostly sunny. A 20 percent chance of Thunderstorms late in the afternoon. Near steady temperature in the mid 70s. West Winds 10 to 15 Mph.

Tonight 30 Jun Le Sueur

Decreasing Clouds. Isolated Thunderstorms early in the evening. Lows around 60. West Winds 5 to 15 Mph. Chance of Thunderstorms 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Decker Lake Temperature Statistics

June Temperature

Mankato, Mankato Regional Airport (10.6 miles)

  • Lowest 9 June, 2025

    50 °F

  • Average June

    69.4 °F

  • Highest 21 June, 2025

    95 °F

Climate (2020–Present)

Mankato, Mankato Regional Airport (10.6 miles)

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  • Average Low 2020–2025

    39.1 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    56.9 °F
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