Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79° N Lon: 73.1° W Elev: 98 ft.

A Few Clouds

74°F

23°C

Humidity 67%
Wind Speed N 9 mph
Barometer 29.88 in (1011.7 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 11 Sep 12:56 am EDT
Detailed forecast for

Northwest Suffolk

Tonight
Partly cloudy late this evening, then becoming mostly cloudy. Lows in the mid 60s. Northwest winds around 5 mph.
Friday
Mostly sunny. Highs in the upper 70s. Northwest winds around 5 mph.
Friday Night
Mostly clear. Lows in the lower 60s. North winds around 5 mph.
Saturday
Mostly sunny. Highs in the upper 70s. East winds around 5 mph, becoming southeast in the afternoon.
Saturday Night
Mostly cloudy. Showers with a slight chance of thunderstorms after midnight. Lows in the upper 60s. South winds 5 to 10 mph. Chance of rain 80 percent.
Sunday
Showers likely. Highs in the upper 70s. Chance of rain 70 percent.
Sunday Night
Partly cloudy. Lows in the mid 60s.
Monday
Mostly sunny. Highs in the mid 70s.
Monday Night
Partly cloudy. Lows in the upper 50s.
Tuesday
Sunny. Highs in the lower 70s.
Tuesday Night
Partly cloudy. Lows in the lower 60s.
Wednesday
Sunny. Highs in the upper 70s.
Wednesday Night
Partly cloudy. Lows in the mid 60s.
Thursday
Partly sunny. A chance of showers in the afternoon. Highs in the upper 70s. Chance of rain 30 percent.



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950 PM EDT Thu Sep 10 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database