Jefferson County Fairgrounds Weather Forecast

    • 56
    • 71

    Rain Showers

    • 55
    • 69

    Rain Showers

    • 48
    • 66

    Chance Rain Showers

    • 49
    • 61

    Chance Rain Showers

    • 49
    • 62

    Partly Sunny

    • 51
    • 67

    Mostly Cloudy

Today 18 Sep Jefferson

Mostly cloudy. A 30 percent chance of light rain Showers late in the afternoon. Highs around 70. East Winds 5 to 15 Mph.

Tonight 18 Sep Jefferson

Showers likely through around midnight. Chance of Thunderstorms through the night. Showers after midnight. Locally heavy rainfall possible after midnight. Lows in the mid 50s. East Winds 10 to 15 Mph. Chance of precipitation near 100 percent.

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Jefferson County Fairgrounds Temperature Statistics

September Temperature

Watertown (11.8 miles)

  • Lowest 14 September, 2026

    40.8 °F

  • Average September

    68.7 °F

  • Highest 1 September, 2026

    87.3 °F

Climate (2021–2026)

Watertown (11.8 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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