Wellesley Island State Park Weather Forecast

    • 68
    • 80

    Mostly Sunny

    • 71
    • 87

    Partly Sunny

    • 64
    • 79

    Rain Showers Likely

    • 66
    • 83

    Partly Sunny

    • 67
    • 85

    Chance Rain Showers

    • 67
    • 87

    Mostly Sunny

Today 23 Jul Jefferson

Sunny. Highs Ranging from the upper 70s on the tug hill to the lower 80s across the lower Elevations. Southwest Winds 10 Mph or less.

Tonight 23 Jul Jefferson

Partly cloudy. Near steady Temperatures Ranging from the mid 50s across the tug hill to the upper 50s along the lake Ontario shore. Light southeast Winds.

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Wellesley Island State Park Temperature Statistics

July Temperature

Watertown, Watertown International Airport (21.1 miles)

  • Lowest 4 July, 2025

    49.6 °F

  • Average July

    72.4 °F

  • Highest 16 July, 2025

    91.7 °F

Climate (2020–Present)

Watertown, Watertown International Airport (21.1 miles)

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  • Average Low 2020–2025

    39 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    57.6 °F
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