Sumac Island Weather Forecast

    • 71
    • 90

    Slight Chance Thunderstorms

    • 68
    • 87

    Smoke

    • 68
    • 84

    Rain Showers Likely

    • 69
    • 82

    Rain Showers Likely

    • 65
    • 80

    Slight Chance Thunderstorms

    • 68
    • 78

    Slight Chance Thunderstorms

    • 68
    • 79

    Chance Thunderstorms

Today 15 Jul Southern New Haven

Partly sunny with a slight chance of Showers and Thunderstorms. Areas of smoke. Highs in the lower 90s. Northwest Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent. Heat index Values in the upper 90s.

Tonight 15 Jul Southern New Haven

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly cloudy after midnight. Areas of smoke in the Evening, then patchy smoke after midnight. Lows around 70. Northwest Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

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Sumac Island Temperature Statistics

July Temperature

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

  • Lowest 7 July, 2026

    60.1 °F

  • Average July

    75.2 °F

  • Highest 3 July, 2026

    93.9 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    63.4 °F
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