Blackhawk Park Weather Forecast

    • 60
    • 70

    Rain Showers

    • 60
    • 73

    Rain Showers

    • 53
    • 66

    Chance Rain Showers

    • 48
    • 63

    Chance Rain Showers

    • 46
    • 61

    Mostly Cloudy

    • 48
    • 64

    Mostly Cloudy

    • 49
    • 66

    Partly Sunny

Today 18 Sep Rock

Mostly cloudy with a 40 percent chance of light Showers. Near steady temperature in the upper 60s. East Winds 10 to 15 Mph.

Tonight 18 Sep Rock

Cloudy. Chance of light Showers and slight chance of Thunderstorms through around Midnight, then Showers and chance of Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall after midnight. Locally heavy rainfall possible after midnight. Lows around 60. East Winds 10 to 15 Mph. Chance of precipitation 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Blackhawk Park Temperature Statistics

September Temperature

Janesville-Rock County (3.7 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    67.8 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (3.7 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.2 °F
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