Jefferson County Fairgrounds Weather Forecast

    • 47
    • 68

    Mostly Cloudy

    • 47
    • 68

    Mostly Cloudy

    • 50
    • 68

    Partly Sunny

    • 53
    • 71

    Partly Sunny

    • 59
    • 70

    Rain Showers Likely

    • 57
    • 67

    Chance Rain Showers

Today 25 Sep Jefferson

Mostly cloudy until late afternoon then clearing. Highs in the upper 60s. East Winds up to 5 Mph.

Tonight 25 Sep Jefferson

Mostly clear. Lows in the upper 40s. East Winds up to 5 Mph.

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Jefferson County Fairgrounds Temperature Statistics

September Temperature

Watertown (11.8 miles)

  • Lowest 14 September, 2026

    40.8 °F

  • Average September

    65.9 °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

    53.8 °F
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