Lake Keomah State Park Weather Forecast

    • 4
    • 26

    Increasing Clouds

    • 20
    • 30

    Mostly Cloudy

    • 27
    • 41

    Mostly Cloudy

    • 17
    • 34

    Chance Snow

    • 3
    • 25

    Slight Chance Snow

    • -4
    • 11

    Mostly Cloudy

Today 7 Dec Mahaska

Mostly sunny. Highs in the mid 20s. Temperature falling to around 15 this afternoon. North Winds 10 to 15 Mph.

Tonight 7 Dec Mahaska

Mostly cloudy. Lows around 4 above. North Winds 5 to 10 Mph, becoming east after midnight.

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Lake Keomah State Park Temperature Statistics

December Temperature

Oskaloosa, Oskaloosa Municipal Airport (5 miles)

  • Lowest 4 December, 2025

    -2.9 °F

  • Average December

    22.2 °F

  • Highest 5 December, 2025

    36.9 °F

Climate (2020–Present)

Oskaloosa, Oskaloosa Municipal Airport (5 miles)

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  • Average Low 2020–2025

    43.7 °F

  • Average 2020–2025

    54 °F

  • Average High 2020–2025

    64.7 °F
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