Lake Keomah State Park Weather Forecast

    • 43
    • 62

    Decreasing Clouds

    • 42
    • 60

    Partly Sunny

    • 49
    • 68

    Mostly Cloudy

    • 50
    • 65

    Rain Showers Likely

    • 47
    • 63

    Chance Rain Showers

    • 47
    • 65

    Chance Rain Showers

    • 48
    • 70

    Slight Chance Thunderstorms

Today 21 May Mahaska

Mostly cloudy. Near steady temperature in the upper 50s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 21 May Mahaska

Mostly cloudy this Evening, then clearing. Lows in the lower 40s. Northwest Winds 15 to 20 Mph, Diminishing to 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Keomah State Park Temperature Statistics

May Temperature

Oskaloosa, Oskaloosa Municipal Airport (5 miles)

  • Lowest 4 May, 2025

    42.1 °F

  • Average May

    65 °F

  • Highest 14 May, 2025

    88.7 °F

Climate (2020–Present)

Oskaloosa, Oskaloosa Municipal Airport (5 miles)

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  • Average Low 2020–2025

    43.5 °F

  • Average 2020–2025

    53.7 °F

  • Average High 2020–2025

    64.6 °F
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