Wellesley Island State Park Weather Forecast

    • 57
    • 74

    Rain Showers Likely

    • 54
    • 75

    Mostly Cloudy

    • 55
    • 79

    Mostly Sunny

    • 62
    • 85

    Partly Sunny

    • 63
    • 82

    Chance Rain Showers

    • 65
    • 83

    Partly Sunny

Today 6 Jun Jefferson

Mostly cloudy with a chance of Showers and Thunderstorms Early, then Showers likely with a chance of Thunderstorms late. Breezy with Highs Ranging from around 70 on the tug hill to the mid 70s across the lower Elevations. Southwest Winds 10 to 15 Mph with Gusts up to 40 Mph. Chance of rain 70 percent.

Tonight 6 Jun Jefferson

Mostly cloudy. Showers likely with a chance of Thunderstorms in the evening. Some patchy fog developing overnight. Breezy with Lows in the mid 50s. West Winds 10 to 15 Mph with Gusts up to 40 Mph in the Evening, becoming light. Chance of rain 70 percent.

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Wellesley Island State Park Temperature Statistics

June Temperature

Watertown, Watertown International Airport (21.1 miles)

  • Lowest 2 June, 2026

    36.6 °F

  • Average June

    57.8 °F

  • Highest 4 June, 2026

    78.1 °F

Climate (2021–Present)

Watertown, Watertown International Airport (21.1 miles)

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  • Average Low 2021–2026

    38.3 °F

  • Average 2021–2026

    48.3 °F

  • Average High 2021–2026

    57.5 °F
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