Mastic Weather Forecast

    • 62
    • 68

    Rain

    • 57
    • 67

    Chance Rain

    • 54
    • 65

    Chance Rain Showers

    • 54
    • 66

    Mostly Cloudy

    • 52
    • 66

    Chance Rain Showers

    • 53
    • 66

    Chance Rain Showers

Today 20 Sep Southeast Suffolk

Rain. Highs in the upper 60s. Southeast Winds 10 to 15 Mph. Chance of rain 90 percent.

Tonight 20 Sep Southeast Suffolk

Periods of rain with a slight chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Lows in the lower 60s. Southeast Winds 10 to 15 Mph, becoming east after midnight. Chance of rain near 100 percent.

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Mastic Temperature Statistics

September Temperature

Shirley, Brookhaven Airport (1.9 miles)

  • Lowest 15 September, 2026

    48.9 °F

  • Average September

    69 °F

  • Highest 10 September, 2026

    84.9 °F

Climate (2021–2026)

Shirley, Brookhaven Airport (1.9 miles)

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    62.5 °F
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