Decker Lake Weather Forecast

    • 66
    • 83

    Partly Sunny

    • 66
    • 83

    Slight Chance Thunderstorms

    • 63
    • 79

    Slight Chance Rain Showers

    • 64
    • 76

    Rain Showers Likely

    • 63
    • 77

    Chance Thunderstorms

    • 58
    • 75

    Partly Sunny

    • 61
    • 77

    Chance Rain Showers

Today 11 Aug Le Sueur

Mostly sunny. Highs in the lower 80s. East Winds up to 5 Mph.

Tonight 11 Aug Le Sueur

Partly cloudy with a 20 percent chance of Thunderstorms early in the Evening, then mostly cloudy in the late evening and overnight. Patchy fog late in the night. Lows in the mid 60s. North Winds up to 5 Mph shifting to the east after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Decker Lake Temperature Statistics

August Temperature

Mankato, Mankato Regional Airport (10.6 miles)

  • Lowest 8 August, 2026

    55 °F

  • Average August

    69.6 °F

  • Highest 9 August, 2026

    82.9 °F

Climate (2021–2026)

Mankato, Mankato Regional Airport (10.6 miles)

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  • Average Low 2021–2026

    39.3 °F

  • Average 2021–2026

    48.3 °F

  • Average High 2021–2026

    57.1 °F
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