Mount Sinai Harbor Weather Forecast

    • 59
    • 70

    Rain Showers

    • 62
    • 75

    Mostly Cloudy

    • 63
    • 80

    Mostly Cloudy

    • 58
    • 73

    Slight Chance Rain Showers

    • 58
    • 71

    Partly Sunny

    • 57
    • 71

    Partly Sunny

Today 25 May Northwest Suffolk

Areas of fog this morning. Showers with a slight chance of Thunderstorms this Morning, then Showers likely this afternoon. Highs in the lower 70s. Southwest Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 25 May Northwest Suffolk

Mostly cloudy. Lows around 60. Southwest Winds around 5 Mph, becoming northwest after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Sinai Harbor Temperature Statistics

May Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 1 May, 2026

    40.6 °F

  • Average May

    60.2 °F

  • Highest 20 May, 2026

    93.7 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
Get WillyWeather+ to remove ads