Wellesley Island State Park Weather Forecast

    • 55
    • 75

    Becoming Sunny

    • 61
    • 76

    Partly Sunny

    • 65
    • 76

    Chance Rain Showers

    • 65
    • 79

    Rain Showers Likely

    • 61
    • 75

    Rain Showers Likely

    • 58
    • 72

    Chance Rain Showers

Today 15 Jun Jefferson

Partly to mostly sunny. Highs Ranging from the upper 60s on the tug hill to the mid 70s across the lower Elevations. Light north Winds.

Tonight 15 Jun Jefferson

Becoming mainly clear. Lows in the mid 50s. Light Winds.

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Wellesley Island State Park Temperature Statistics

June Temperature

Watertown, Watertown International Airport (21.1 miles)

  • Lowest 3 June, 2025

    43.6 °F

  • Average June

    64.1 °F

  • Highest 4 June, 2025

    88.6 °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

    57.7 °F
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