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

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Light Rain Fog/Mist

41°F

5°C

Humidity 93%
Wind Speed E 9 mph
Barometer 30.06 in
Dewpoint 39°F (4°C)
Visibility 6.00 mi
Wind Chill35°F (2°C)
Last update 10 Jan 4:56 pm EST
Extended Forecast for

Islip NYSimilar City Names

  • This Afternoon

    This Afternoon: Rain. Steady temperature around 41. East wind around 9 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.

    High: 41 °F

    Rain

  • Tonight

    Tonight: Rain, mainly before 4am. Patchy fog after 1am. Low around 41. East wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 41 °F

    Rain then
    Rain Likely
    and Patchy
    Fog

  • Sunday

    Sunday: A chance of rain before 10am, then a slight chance of showers after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 45. West wind 6 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 45 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 29. Wind chill values between 20 and 25. West wind around 16 mph, with gusts as high as 33 mph.

    Low: 29 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 41. West wind 10 to 13 mph, with gusts as high as 26 mph.

    High: 41 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 45.

    High: 45 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 46.

    High: 46 °F

    Cloudy

Detailed Forecast

This Afternoon
Rain. Steady temperature around 41. East wind around 9 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain, mainly before 4am. Patchy fog after 1am. Low around 41. East wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
A chance of rain before 10am, then a slight chance of showers after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 45. West wind 6 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 29. Wind chill values between 20 and 25. West wind around 16 mph, with gusts as high as 33 mph.
Monday
Sunny, with a high near 41. West wind 10 to 13 mph, with gusts as high as 26 mph.
Monday Night
Mostly clear, with a low around 31.
Tuesday
Sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Cloudy, with a high near 46.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 25.
Saturday
Mostly sunny, with a high near 39.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NYSimilar City Names
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:33 pm EST Jan 10, 2026
Forecast Valid:
5pm EST Jan 10, 2026-6pm EST Jan 17, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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