Great South Bay Weather Forecast

    • 45
    • 49

    Rain Showers Likely

    • 46
    • 59

    Partly Sunny

    • 43
    • 52

    Mostly Cloudy

    • 44
    • 47

    Chance Rain Showers

    • 45
    • 50

    Slight Chance Rain Showers

    • 47
    • 52

    Chance Rain Showers

Today 22 Apr Southwest Suffolk

Mostly cloudy. Showers Likely, mainly this morning. Highs in the lower 50s. Southeast Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 60 percent.

Tonight 22 Apr Southwest Suffolk

Mostly cloudy. Lows in the lower 40s. Northeast Winds 5 to 10 Mph, becoming north after midnight.

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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

    55.1 °F

  • Average High 2021–2026

    63 °F
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