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

83°F

28°C

Humidity 57%
Wind Speed S 9 mph
Barometer 29.95 in (1014.1 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 10 Aug 2:56 pm EDT
Extended Forecast for

Islip NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a steady temperature around 85. South wind around 9 mph.

    High: 85 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 8pm and 2am. Mostly cloudy, with a low around 73. West wind around 7 mph.

    Low: 73 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. West wind 7 to 9 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 70. Southwest wind around 6 mph becoming light and variable in the evening.

    Low: 70 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 86. North wind 5 to 7 mph becoming west in the afternoon.

    High: 86 °F

    Chance
    Showers then
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a steady temperature around 85. South wind around 9 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between 8pm and 2am. Mostly cloudy, with a low around 73. West wind around 7 mph.
Tuesday
Mostly sunny, with a high near 89. West wind 7 to 9 mph.
Tuesday Night
A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 70. Southwest wind around 6 mph becoming light and variable in the evening.
Wednesday
A 30 percent chance of showers before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 86. North wind 5 to 7 mph becoming west in the afternoon.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 86.
Thursday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 69.
Friday
Mostly sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 79.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
A 30 percent chance of showers. Mostly sunny, with a high near 79.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 67.
Monday
A chance of showers. Partly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:38 pm EDT Aug 10, 2026
Forecast Valid:
3pm EDT Aug 10, 2026-6pm EDT Aug 17, 2026
 
Forecast Discussion
 
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Additional Resources

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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