Mastic Beach Weather Forecast

    • 63
    • 74

    Rain Showers Likely

    • 61
    • 74

    Chance Rain Showers

    • 64
    • 79

    Mostly Sunny

    • 66
    • 78

    Partly Sunny

    • 67
    • 78

    Chance Rain Showers

    • 63
    • 79

    Chance Rain Showers

Today 20 Aug Southeast Suffolk

Partly sunny with a chance of Showers in the Morning, then mostly cloudy with Showers likely with a slight chance of Thunderstorms in the afternoon. Highs in the lower 70s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 20 Aug Southeast Suffolk

Showers likely with a chance of Thunderstorms in the Evening, then Showers likely with a slight chance of Thunderstorms after midnight. Lows in the mid 60s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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Mastic Beach Temperature Statistics

August Temperature

Shirley, Brookhaven Airport (3.7 miles)

  • Lowest 9 August, 2025

    51.7 °F

  • Average August

    71.9 °F

  • Highest 4 August, 2025

    86.6 °F

Climate (2020–Present)

Shirley, Brookhaven Airport (3.7 miles)

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  • Average Low 2020–2025

    46.7 °F

  • Average 2020–2025

    55 °F

  • Average High 2020–2025

    63 °F
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