Decker Lake Weather Forecast

    • -3
    • 36

    Snow Likely

    • 17
    • 26

    Mostly Cloudy

    • 1
    • 28

    Mostly Sunny

    • 14
    • 24

    Mostly Cloudy

    • 24
    • 36

    Mostly Cloudy

    • 18
    • 31

    Mostly Cloudy

Today 18 Dec Le Sueur

Windy, cloudy. Chance of rain early in the Morning, then chance of snow in the late morning and afternoon. Patchy blowing snow late in the afternoon. Highs in the mid 30s. Southwest Winds 10 to 15 Mph shifting to the west 15 to 25 Mph in the Morning, then shifting to the northwest 25 to 30 Mph with Gusts to around 45 Mph in the afternoon. Chance of precipitation 50 percent.

Tonight 18 Dec Le Sueur

Windy. Much Colder. Mostly cloudy in the evening then clearing. Lows around 3 below. Northwest Winds 20 to 30 Mph with Gusts to around 45 Mph decreasing to 10 to 15 Mph with Gusts to around 30 Mph after midnight.

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Decker Lake Temperature Statistics

December Temperature

Mankato, Mankato Regional Airport (10.6 miles)

  • Lowest 4 December, 2025

    -9.9 °F
  • Average December

    13.4 °F
  • Highest 9 December, 2025

    37.9 °F

Climate (2020–Present)

Mankato, Mankato Regional Airport (10.6 miles)

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  • Average Low 2020–2025

    39.3 °F
  • Average 2020–2025

    48.2 °F
  • Average High 2020–2025

    57 °F
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