Great River Weather Forecast

    • 38
    • 52

    Rain

    • 31
    • 46

    Rain

    • 34
    • 44

    Partly Sunny

    • 38
    • 48

    Mostly Cloudy

    • 42
    • 51

    Rain Likely

    • 27
    • 53

    Slight Chance Snow

    • 31
    • 41

    Partly Sunny

Today 22 Mar Southwest Suffolk

Mostly cloudy. A chance of rain this afternoon. Highs in the lower 50s. South Winds 10 to 15 Mph. Chance of rain 40 percent.

Tonight 22 Mar Southwest Suffolk

Rain. Lows in the upper 30s. South Winds 5 to 10 Mph, becoming northeast after midnight. Chance of rain 90 percent.

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Great River Temperature Statistics

March Temperature

Islip, Long Island Mac Arthur Airport (5 miles)

  • Lowest 3 March, 2026

    18.6 °F

  • Average March

    40.4 °F

  • Highest 9 March, 2026

    68.6 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (5 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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