Guernsey Weather Forecast

    • 67
    • 80

    Chance Thunderstorms

    • 66
    • 80

    Chance Thunderstorms

    • 63
    • 82

    Slight Chance Thunderstorms

    • 62
    • 81

    Mostly Sunny

    • 67
    • 83

    Mostly Sunny

    • 70
    • 87

    Slight Chance Thunderstorms

Today 10 Aug Poweshiek

Mostly cloudy with a chance of Showers and Thunderstorms. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the upper 70s. West Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 10 Aug Poweshiek

Mostly cloudy. A chance of Showers and Thunderstorms, mainly in the evening. Patchy fog after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Humid with Lows in the upper 60s. West Winds 5 to 10 Mph. Chance of rain 40 percent.

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Guernsey Temperature Statistics

August Temperature

Oskaloosa, Oskaloosa Municipal Airport (29.8 miles)

  • Lowest 1 August, 2025

    57.4 °F

  • Average August

    73 °F

  • Highest 8 August, 2025

    91 °F

Climate (2020–Present)

Oskaloosa, Oskaloosa Municipal Airport (29.8 miles)

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  • Average Low 2020–2025

    43.4 °F

  • Average 2020–2025

    53.7 °F

  • Average High 2020–2025

    64.5 °F
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