Armstrong Lake Weather Forecast

    • 67
    • 86

    Decreasing Clouds

    • 66
    • 82

    Rain Showers Likely

    • 69
    • 82

    Chance Thunderstorms

    • 62
    • 86

    Chance Thunderstorms

    • 56
    • 79

    Mostly Sunny

    • 60
    • 81

    Mostly Sunny

Today 5 Sep Blue Earth

Partly sunny. Highs in the mid 80s. East Winds 5 to 10 Mph.

Tonight 5 Sep Blue Earth

Partly cloudy. A 20 percent chance of Thunderstorms after midnight. Lows in the upper 60s. Southeast Winds 5 to 10 Mph.

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Armstrong Lake Temperature Statistics

September Temperature

New Ulm Municipal Airport (13.7 miles)

  • Lowest 1 September, 2026

    60.8 °F

  • Average September

    76 °F

  • Highest 3 September, 2026

    89.6 °F

Climate (2021–2026)

New Ulm Municipal Airport (13.7 miles)

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  • Average Low 2021–2026

    37.6 °F

  • Average 2021–2026

    47.4 °F

  • Average High 2021–2026

    57 °F
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