Riverside Weather Forecast

    • 16
    • 39

    Becoming Sunny

    • 25
    • 32

    Partly Sunny

    • 34
    • 43

    Mostly Cloudy

    • 32
    • 47

    Mostly Cloudy

    • 42
    • 51

    Mostly Cloudy

    • 35
    • 60

    Mostly Cloudy

Today 20 Dec Washington

Mostly sunny. Not as cool with Highs around 40. Temperature falling into the mid 30s in the afternoon. West Winds 10 to 15 Mph, becoming northwest in the afternoon.

Tonight 20 Dec Washington

Mostly clear. Lows around 17. Northwest Winds 5 to 10 Mph.

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Riverside Temperature Statistics

December Temperature

Iowa City Municipal Airport (10.6 miles)

  • Lowest 14 December, 2025

    -7.1 °F

  • Average December

    20.9 °F

  • Highest 9 December, 2025

    43 °F

Climate (2020–Present)

Iowa City Municipal Airport (10.6 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    62.8 °F
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