Old Mastic Weather Forecast

    • 73
    • 79

    Chance Thunderstorms

    • 70
    • 82

    Chance Thunderstorms

    • 66
    • 80

    Mostly Sunny

    • 67
    • 76

    Mostly Sunny

    • 71
    • 80

    Partly Sunny

    • 73
    • 82

    Partly Sunny

    • 74
    • 84

    Slight Chance Rain Showers

Today 19 Jul Southeast Suffolk

Mostly sunny. Near steady temperature in the upper 70s. South Winds around 10 Mph.

Tonight 19 Jul Southeast Suffolk

Partly cloudy this Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows in the lower 70s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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Old Mastic Temperature Statistics

July Temperature

Shirley, Brookhaven Airport (3.1 miles)

  • Lowest 5 July, 2025

    59.6 °F

  • Average July

    77.2 °F

  • Highest 8 July, 2025

    90.6 °F

Climate (2020–Present)

Shirley, Brookhaven Airport (3.1 miles)

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  • Average Low 2020–2025

    46.8 °F

  • Average 2020–2025

    55 °F

  • Average High 2020–2025

    63 °F
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