Sumac Island Weather Forecast

    • 54
    • 70

    Decreasing Clouds

    • 49
    • 70

    Mostly Sunny

    • 51
    • 67

    Mostly Cloudy

    • 48
    • 57

    Rain Showers

    • 47
    • 54

    Rain Showers

    • 50
    • 59

    Chance Rain Showers

    • 50
    • 63

    Chance Rain Showers

Today 18 May Southern New Haven

Partly sunny late this Morning, then mostly cloudy with a slight chance of Showers this afternoon. Highs in the lower 70s. West Winds 10 to 15 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

Tonight 18 May Southern New Haven

Mostly cloudy this Evening, then clearing. Lows in the lower 50s. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumac Island Temperature Statistics

May Temperature

New Haven, Tweed-New Haven Airport (3.7 miles)

  • Lowest 1 May, 2025

    43.6 °F

  • Average May

    62.9 °F

  • Highest 8 May, 2025

    77.6 °F

Climate (2020–Present)

New Haven, Tweed-New Haven Airport (3.7 miles)

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  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    55.8 °F

  • Average High 2020–2025

    63.7 °F
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