Glenn Weather Forecast

    • 60
    • 75

    Mostly Sunny

    • 59
    • 79

    Slight Chance Thunderstorms

    • 60
    • 76

    Chance Rain Showers

    • 61
    • 75

    Rain Showers Likely

    • 61
    • 74

    Chance Rain Showers

    • 58
    • 71

    Chance Rain Showers

Today 18 Sep Allegan

Sunny. Highs in the upper 70s near lake Michigan in the mid 80s inland. Light Winds becoming northwest 10 Mph in the afternoon.

Tonight 18 Sep Allegan

Mostly clear. Patchy fog after midnight. Lows in the upper 50s. Light Winds becoming east 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Glenn Temperature Statistics

September Temperature

South Haven, South Haven Area Regional Airport (11.2 miles)

  • Lowest 8 September, 2025

    41 °F

  • Average September

    62.7 °F

  • Highest 14 September, 2025

    86 °F

Climate (2020–Present)

South Haven, South Haven Area Regional Airport (11.2 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    51.1 °F

  • Average High 2020–2025

    59.2 °F
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