Williamstown Weather Forecast

    • 67
    • 86

    Chance Rain Showers

    • 67
    • 88

    Rain Showers

    • 63
    • 80

    Thunderstorms Likely

    • 64
    • 83

    Mostly Sunny

    • 72
    • 87

    Mostly Sunny

    • 74
    • 92

    Mostly Sunny

Today 16 Jun Johnson

Partly cloudy. A chance of Showers and Thunderstorms after Midnight, then a slight chance of Showers and Thunderstorms. Humid with Highs in the mid 80s. South Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 16 Jun Johnson

Mostly clear in the Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Humid with Lows in the upper 60s. South Winds around 5 Mph. Chance of rain 40 percent.

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Williamstown Temperature Statistics

June Temperature

Iowa City Municipal Airport (10.6 miles)

  • Lowest 10 June, 2025

    49.6 °F

  • Average June

    69.6 °F

  • Highest 11 June, 2025

    93.7 °F

Climate (2020–Present)

Iowa City Municipal Airport (10.6 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    62.5 °F
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