Rock Lake Weather Forecast

    • 60
    • 67

    Rain Showers

    • 54
    • 66

    Chance Rain Showers

    • 48
    • 63

    Chance Rain Showers

    • 47
    • 61

    Mostly Cloudy

    • 49
    • 64

    Mostly Cloudy

    • 51
    • 67

    Mostly Cloudy

    • 50
    • 71

    Partly Sunny

Today 19 Sep Jefferson

Partly sunny. Highs in the lower 70s.

Tonight 19 Sep Jefferson

Showers and chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Lows around 60. Northeast Winds 5 to 10 Mph. Chance of precipitation 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Lake Temperature Statistics

September Temperature

Watertown (11.8 miles)

  • Lowest 14 September, 2026

    40.8 °F

  • Average September

    68 °F

  • Highest 1 September, 2026

    87.3 °F

Climate (2021–2026)

Watertown (11.8 miles)

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  • Average Low 2021–2026

    35.3 °F

  • Average 2021–2026

    44.9 °F

  • Average High 2021–2026

    53.9 °F
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