Watertown Weather Forecast

    • 52
    • 65

    Rain Showers Likely

    • 48
    • 65

    Rain Showers Likely

    • 46
    • 66

    Mostly Sunny

    • 54
    • 74

    Mostly Sunny

    • 54
    • 75

    Partly Sunny

    • 44
    • 69

    Mostly Sunny

Today 6 Sep Jefferson

Showers through early afternoon. Highs Ranging from the upper 50s on the tug hill to the mid 60s across the lower Elevations. Southwest Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 6 Sep Jefferson

Mostly cloudy. A chance of Showers in the Evening, then Showers likely overnight. Lows Ranging from around 50 across the tug hill to the mid 50s along the lake Ontario shore. Southwest Winds 5 to 10 Mph, becoming light. Chance of rain 70 percent.

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Watertown Temperature Statistics

September Temperature

Watertown, Watertown International Airport (5.6 miles)

  • Lowest 1 September, 2025

    45 °F

  • Average September

    64.5 °F

  • Highest 4 September, 2025

    80.1 °F

Climate (2020–Present)

Watertown, Watertown International Airport (5.6 miles)

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  • Average Low 2020–2025

    38.9 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    57.7 °F
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