Williamstown Weather Forecast

    • 28
    • 30

    Chance Snow

    • 10
    • 36

    Slight Chance Snow

    • 2
    • 15

    Mostly Cloudy

    • 5
    • 20

    Mostly Cloudy

    • 4
    • 14

    Mostly Sunny

    • 12
    • 23

    Mostly Cloudy

Today 15 Jan Johnson

Sunny early this Morning, then mostly cloudy with a chance of snow this afternoon. Highs around 30. Northwest Winds 5 to 10 Mph, becoming south 10 to 15 Mph this afternoon. Chance of snow 30 percent.

Tonight 15 Jan Johnson

Mostly cloudy. A chance of snow with a slight chance of freezing rain in the evening. Little or no snow accumulation. Not as cool. Near steady temperature in the upper 20s. Southwest Winds around 10 Mph, becoming west after midnight. Chance of precipitation 40 percent.

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Williamstown Temperature Statistics

January Temperature

Iowa City Municipal Airport (10.6 miles)

  • Lowest 1 January, 2026

    15.1 °F

  • Average January

    32.2 °F

  • Highest 8 January, 2026

    57.9 °F

Climate (2021–Present)

Iowa City Municipal Airport (10.6 miles)

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  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    52.7 °F

  • Average High 2021–2026

    62.9 °F
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