Great South Bay Weather Forecast

    • 47
    • 52

    Increasing Clouds

    • 46
    • 56

    Rain Showers

    • 44
    • 54

    Partly Sunny

    • 43
    • 55

    Partly Sunny

    • 45
    • 56

    Partly Sunny

    • 46
    • 57

    Partly Sunny

Today 29 Apr Southwest Suffolk

Mostly sunny this Morning, then becoming mostly cloudy. Highs in the upper 50s. East Winds 5 to 10 Mph, becoming south this afternoon.

Tonight 29 Apr Southwest Suffolk

A chance of Showers in the Evening, then Showers after midnight. Patchy fog. Lows in the upper 40s. Southeast Winds 5 to 10 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

April Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 9 April, 2026

    27.6 °F

  • Average April

    52.5 °F

  • Highest 16 April, 2026

    82.7 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63 °F
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