Old Mastic Weather Forecast

    • 59
    • 76

    Sunny

    • 61
    • 79

    Mostly Sunny

    • 69
    • 78

    Rain Showers Likely

    • 69
    • 78

    Rain Showers Likely

    • 68
    • 78

    Chance Rain Showers

    • 68
    • 79

    Partly Sunny

    • 70
    • 80

    Partly Sunny

Today 25 Jul Southeast Suffolk

Sunny. Near steady temperature in the mid 70s. East Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 25 Jul Southeast Suffolk

Mostly clear. Lows around 60. East Winds 5 to 10 Mph.

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Old Mastic Temperature Statistics

July Temperature

Shirley, Brookhaven Airport (3.1 miles)

  • Lowest 20 July, 2026

    57.9 °F

  • Average July

    74.8 °F

  • Highest 3 July, 2026

    98.1 °F

Climate (2021–2026)

Shirley, Brookhaven Airport (3.1 miles)

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    62.5 °F
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