Decker Lake Weather Forecast

    • 63
    • 89

    Chance Thunderstorms

    • 58
    • 89

    Slight Chance Thunderstorms

    • 56
    • 83

    Mostly Sunny

    • 57
    • 85

    Partly Sunny

    • 55
    • 81

    Partly Sunny

    • 55
    • 80

    Mostly Sunny

Today 26 May Le Sueur

Mostly sunny. Chance of Thunderstorms late in the Morning, then slight chance of Thunderstorms in the afternoon. Highs in the upper 80s. Southwest Winds 5 to 15 Mph. Chance of Thunderstorms 40 percent.

Tonight 26 May Le Sueur

Increasing Clouds. A 40 percent chance of Thunderstorms. Lows in the lower 60s. Southeast Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Decker Lake Temperature Statistics

May Temperature

Mankato, Mankato Regional Airport (10.6 miles)

  • Lowest 6 May, 2026

    30 °F

  • Average May

    56.8 °F

  • Highest 15 May, 2026

    89.1 °F

Climate (2021–Present)

Mankato, Mankato Regional Airport (10.6 miles)

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  • Average Low 2021–2026

    39.3 °F

  • Average 2021–2026

    48.2 °F

  • Average High 2021–2026

    57.2 °F
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