Johnstown Center Weather Forecast

    • 57
    • 81

    Mostly Sunny

    • 62
    • 82

    Mostly Cloudy

    • 57
    • 76

    Rain Showers Likely

    • 57
    • 78

    Partly Sunny

    • 61
    • 81

    Partly Sunny

    • 64
    • 82

    Slight Chance Thunderstorms

Today 3 Aug Rock

Sunny. Highs in the lower 80s. East Winds up to 5 Mph.

Tonight 3 Aug Rock

Clear after midnight then becoming partly cloudy. Patchy fog early in the morning. Lows in the mid 50s. Calm Winds.

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Johnstown Center Temperature Statistics

August Temperature

Janesville-Rock County (11.2 miles)

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  • Average August

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Climate (2021–2026)

Janesville-Rock County (11.2 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.4 °F
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