Lake Keomah State Park Weather Forecast

    • 59
    • 82

    Decreasing Clouds

    • 56
    • 72

    Rain Showers Likely

    • 68
    • 81

    Rain Showers

    • 61
    • 79

    Rain Showers

    • 63
    • 77

    Rain Showers Likely

    • 59
    • 77

    Chance Thunderstorms

Today 12 Sep Mahaska

Mostly sunny. Highs in the lower 80s. West Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming north this afternoon.

Tonight 12 Sep Mahaska

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 50s. North Winds around 5 Mph.

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  • Temperature Real-Time

Lake Keomah State Park Temperature Statistics

September Temperature

Oskaloosa, Oskaloosa Municipal Airport (5 miles)

  • Lowest 10 September, 2026

    64.6 °F

  • Average September

    79.6 °F

  • Highest 3 September, 2026

    96.8 °F

Climate (2021–2026)

Oskaloosa, Oskaloosa Municipal Airport (5 miles)

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  • Average Low 2021–2026

    43.9 °F

  • Average 2021–2026

    54.4 °F

  • Average High 2021–2026

    65.3 °F
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