Decker Lake Weather Forecast

    • 10
    • 15

    Increasing Clouds

    • 8
    • 30

    Chance Snow

    • -5
    • 17

    Chance Snow

    • -5
    • 7

    Slight Chance Snow

    • 15
    • 24

    Chance Snow

    • 20
    • 30

    Chance Snow

Today 4 Dec Le Sueur

Mostly sunny. Highs around 17. South Winds up to 10 Mph increasing to 10 to 15 Mph with Gusts to around 30 Mph in the afternoon.

Tonight 4 Dec Le Sueur

Not as cold. Mostly cloudy. Lows around 11. South Winds 15 to 20 Mph shifting to the southwest 5 to 15 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Decker Lake Temperature Statistics

December Temperature

Mankato, Mankato Regional Airport (10.6 miles)

  • Lowest 1 December, 2025

    1.9 °F

  • Average December

    10.7 °F

  • Highest 1 December, 2025

    19 °F

Climate (2020–Present)

Mankato, Mankato Regional Airport (10.6 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    48.3 °F

  • Average High 2020–2025

    57.1 °F
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