National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

27°C

80°F

Humidity 71%
Wind Speed NE 6 km/h
Barometer 1019.6 mb (30.11 in)
Dewpoint 21°C (70°F)
Visibility 16 km
Heat Index28°C (83°F)
Last update 13 Jul 10:56 am EDT
Extended Forecast for

Islip Terrace NY

  • Today

    Today: Partly sunny, with a high near 26. Southeast wind around 14 km/h.

    High: 26 °C

    Partly Sunny

  • Tonight

    Tonight: Patchy drizzle and fog after 10pm. Mostly cloudy, with a low around 22. Southeast wind 5 to 13 km/h.

    Low: 22 °C

    Patchy
    Drizzle and
    Patchy Fog

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 28. Southeast wind 8 to 14 km/h.

    High: 28 °C

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 23. Southwest wind 5 to 10 km/h.

    Low: 23 °C

    Chance
    T-storms and
    Patchy Fog

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly before 2pm. Partly sunny, with a high near 29. Light southwest wind becoming south 6 to 11 km/h in the morning.

    High: 29 °C

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 23.

    Low: 23 °C

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 31.

    High: 31 °C

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 23.

    Low: 23 °C

    Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 31.

    High: 31 °C

    Partly Sunny
    then Chance
    T-storms

Detailed Forecast

Today
Partly sunny, with a high near 26. Southeast wind around 14 km/h.
Tonight
Patchy drizzle and fog after 10pm. Mostly cloudy, with a low around 22. Southeast wind 5 to 13 km/h.
Monday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 28. Southeast wind 8 to 14 km/h.
Monday Night
A 40 percent chance of showers and thunderstorms. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 23. Southwest wind 5 to 10 km/h.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly before 2pm. Partly sunny, with a high near 29. Light southwest wind becoming south 6 to 11 km/h in the morning.
Tuesday Night
Partly cloudy, with a low around 23.
Wednesday
Mostly sunny, with a high near 31.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 23.
Thursday
A 40 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 31.
Thursday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 40%.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 31.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 23.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 m)
Last Update:
6:52 am EDT Jul 13, 2025
Forecast Valid:
11am EDT Jul 13, 2025-6pm EDT Jul 19, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation