Lake Jefferson Weather Forecast

    • 67
    • 85

    Increasing Clouds

    • 67
    • 87

    Slight Chance Thunderstorms

    • 66
    • 85

    Mostly Sunny

    • 64
    • 87

    Chance Rain Showers

    • 61
    • 79

    Chance Thunderstorms

    • 58
    • 76

    Chance Rain Showers

    • 53
    • 72

    Chance Rain Showers

Today 13 Sep Le Sueur

Mostly sunny. Highs in the mid 80s. Southeast Winds 5 to 10 Mph.

Tonight 13 Sep Le Sueur

Increasing Clouds. Lows in the upper 60s. Southeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Jefferson Temperature Statistics

September Temperature

Mankato, Mankato Regional Airport (7.5 miles)

  • Lowest 4 September, 2025

    41 °F

  • Average September

    59.9 °F

  • Highest 8 September, 2025

    78.1 °F

Climate (2020–Present)

Mankato, Mankato Regional Airport (7.5 miles)

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  • Average Low 2020–2025

    39.2 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    56.8 °F
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