Round Island Weather Forecast

    • 63
    • 85

    Slight Chance Thunderstorms

    • 56
    • 75

    Mostly Cloudy

    • 54
    • 77

    Mostly Sunny

    • 62
    • 80

    Mostly Sunny

    • 63
    • 83

    Mostly Sunny

    • 63
    • 85

    Partly Sunny

    • 65
    • 86

    Partly Sunny

Today 30 Jul Jefferson

Mostly sunny. Highs Ranging from around 80 on the tug hill to the mid 80s across the lower Elevations. Light west Winds.

Tonight 30 Jul Jefferson

Mostly cloudy. Lows in the lower 60s. Light Winds, becoming northeast 5 to 10 Mph.

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Round Island Temperature Statistics

July Temperature

Watertown, Watertown International Airport (18 miles)

  • Lowest 22 July, 2025

    46.7 °F

  • Average July

    72.3 °F

  • Highest 16 July, 2025

    91.7 °F

Climate (2020–Present)

Watertown, Watertown International Airport (18 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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