Rock River Park Weather Forecast

    • 57
    • 81

    Rain Showers Likely

    • 52
    • 75

    Partly Sunny

    • 61
    • 79

    Mostly Sunny

    • 56
    • 80

    Chance Thunderstorms

    • 62
    • 77

    Chance Rain Showers

    • 62
    • 82

    Rain Showers Likely

Today 9 Sep Jefferson

Mostly cloudy. A 50 percent chance of light Showers in the morning. Highs in the lower 80s. West Winds 5 to 10 Mph.

Tonight 9 Sep Jefferson

Cooler. Partly cloudy. Lows in the upper 50s. Northwest Winds up to 5 Mph.

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Rock River Park Temperature Statistics

September Temperature

Watertown (17.4 miles)

  • Lowest 7 September, 2026

    54.9 °F

  • Average September

    72.5 °F

  • Highest 1 September, 2026

    87.3 °F

Climate (2021–2026)

Watertown (17.4 miles)

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  • Average Low 2021–2026

    35.2 °F

  • Average 2021–2026

    44.9 °F

  • Average High 2021–2026

    53.9 °F
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