Round Island Weather Forecast

    • 38
    • 51

    Decreasing Clouds

    • 43
    • 61

    Mostly Cloudy

    • 38
    • 54

    Partly Sunny

    • 37
    • 54

    Slight Chance Rain Showers

    • 38
    • 54

    Partly Sunny

    • 40
    • 56

    Mostly Cloudy

Today 8 May Jefferson

Partly to mostly sunny. Cool with Highs Ranging from the upper 40s on the tug hill to the lower 50s across the lower Elevations. Light Winds, becoming southwest 10 to 15 Mph.

Tonight 8 May Jefferson

Mostly cloudy with patchy frost. Lows Ranging from the lower 30s on the tug hill to the mid 30s across the lower Elevations. Light southwest Winds.

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Round Island Temperature Statistics

May Temperature

Watertown, Watertown International Airport (18 miles)

  • Lowest 1 May, 2026

    29.6 °F

  • Average May

    49 °F

  • Highest 4 May, 2026

    70.6 °F

Climate (2021–Present)

Watertown, Watertown International Airport (18 miles)

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  • Average Low 2021–2026

    38.4 °F

  • Average 2021–2026

    48.3 °F

  • Average High 2021–2026

    57.6 °F
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