Sweet Marsh State Wildlife Management Area Weather Forecast

    • 69
    • 82

    Chance Thunderstorms

    • 65
    • 82

    Partly Sunny

    • 58
    • 80

    Mostly Sunny

    • 59
    • 78

    Mostly Sunny

    • 57
    • 79

    Partly Sunny

    • 51
    • 74

    Mostly Sunny

Today 18 Aug Bremer

Mostly cloudy with a chance of Showers and Thunderstorms. Highs in the lower 80s. Southwest Winds around 10 Mph. Chance of rain 40 percent.

Tonight 18 Aug Bremer

Mostly Cloudy, then becoming partly cloudy this Evening, then becoming mostly cloudy. A chance of Showers and Thunderstorms early. Patchy fog after midnight. Humid with Lows in the upper 60s. Southwest Winds 5 to 10 Mph, becoming northwest. Chance of rain 30 percent.

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Sweet Marsh State Wildlife Management Area Temperature Statistics

August Temperature

Oelwein Municipal Airport (16.2 miles)

  • Lowest 1 August, 2025

    53.6 °F

  • Average August

    71 °F

  • Highest 16 August, 2025

    89.6 °F

Climate (2020–Present)

Oelwein Municipal Airport (16.2 miles)

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  • Average Low 2020–2025

    38.3 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    57.7 °F
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