Blackhawk Park Weather Forecast

    • 61
    • 85

    Partly Sunny

    • 61
    • 82

    Chance Rain Showers

    • 61
    • 78

    Chance Rain Showers

    • 61
    • 76

    Chance Thunderstorms

    • 59
    • 77

    Chance Rain Showers

    • 55
    • 75

    Slight Chance Thunderstorms

Today 18 Sep Rock

Sunny. Highs in the mid 80s. Southeast Winds up to 10 Mph.

Tonight 18 Sep Rock

Partly cloudy until early morning then becoming mostly cloudy. A 20 percent chance of light Showers after midnight. Lows in the lower 60s. East Winds up to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Blackhawk Park Temperature Statistics

September Temperature

Janesville-Rock County (3.7 miles)

  • Lowest 7 September, 2025

    39.2 °F

  • Average September

    59.4 °F

  • Highest 14 September, 2025

    84.2 °F

Climate (2020–Present)

Janesville-Rock County (3.7 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.3 °F
Get WillyWeather+ to remove ads