Johnstown Weather Forecast

    • 35
    • 52

    Rain Showers

    • 33
    • 53

    Mostly Sunny

    • 31
    • 48

    Partly Sunny

    • 35
    • 56

    Sunny

    • 47
    • 62

    Rain Showers Likely

    • 32
    • 59

    Chance Rain Showers

    • 33
    • 53

    Partly Sunny

Today 18 Apr Rock

Rain Showers. North Winds around 5 Mph. Chance of Showers 90 percent.

Tonight 18 Apr Rock

Cloudy with light rain Showers likely in the Evening, then mostly clear in the late evening and overnight. Patchy frost early in the morning. Lows in the mid 30s. Northwest Winds 5 to 10 Mph. Chance of Showers 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnstown Temperature Statistics

April Temperature

Janesville-Rock County (13 miles)

  • Lowest 6 April, 2024

    28.4 °F

  • Average April

    47.6 °F

  • Highest 14 April, 2024

    82.4 °F

Climate (2019–Present)

Janesville-Rock County (13 miles)

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  • Average Low 2019–2024

    40.7 °F

  • Average 2019–2024

    48.8 °F

  • Average High 2019–2024

    60 °F
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