Lake Keomah State Park Weather Forecast

    • 55
    • 83

    Rain Showers Likely

    • 51
    • 72

    Mostly Sunny

    • 56
    • 76

    Mostly Sunny

    • 58
    • 79

    Chance Thunderstorms

    • 60
    • 82

    Rain Showers Likely

    • 58
    • 81

    Slight Chance Thunderstorms

Today 13 Jun Mahaska

Mostly sunny. Showers likely with a chance of Thunderstorms in the afternoon. Highs in the lower 80s. South Winds 5 to 10 Mph, becoming northwest in the afternoon. Chance of rain 70 percent.

Tonight 13 Jun Mahaska

Mostly cloudy with Showers likely with a chance of Thunderstorms in the Evening, then partly cloudy with a slight chance of Showers after midnight. Lows in the mid 50s. North Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

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Lake Keomah State Park Temperature Statistics

June Temperature

Oskaloosa, Oskaloosa Municipal Airport (5 miles)

  • Lowest 2 June, 2026

    57.4 °F

  • Average June

    77.2 °F

  • Highest 9 June, 2026

    93.9 °F

Climate (2021–Present)

Oskaloosa, Oskaloosa Municipal Airport (5 miles)

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  • Average Low 2021–2026

    43.9 °F

  • Average 2021–2026

    54.3 °F

  • Average High 2021–2026

    65.2 °F
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