Osterhout Lake Weather Forecast

    • 58
    • 84

    Mostly Sunny

    • 58
    • 85

    Partly Sunny

    • 57
    • 82

    Slight Chance Rain Showers

    • 59
    • 82

    Chance Rain Showers

    • 59
    • 79

    Chance Thunderstorms

    • 55
    • 75

    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 5 to 10 Mph in the afternoon.

Tonight 18 Sep Allegan

Mostly clear. Lows in the mid 50s. Light Winds.

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Osterhout Lake Temperature Statistics

September Temperature

South Haven, South Haven Area Regional Airport (12.4 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 (12.4 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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