Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

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

Mostly Cloudy

85°F

29°C

Humidity 65%
Wind Speed SW 12 mph
Barometer 29.71 in (1006.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 11 Jun 4:56 pm EDT
Detailed forecast for

Northwest Suffolk

This Afternoon
Mostly cloudy with a chance of showers and thunderstorms. Warmer. Near steady temperature around 90. West winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 102.
Tonight
Mostly cloudy. A chance of showers and thunderstorms in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Humid with lows in the lower 70s. West winds 5 to 10 mph. Chance of rain 50 percent.
Friday
Mostly sunny. Humid with highs in the lower 90s. West winds 5 to 10 mph. Heat index values up to 100.
Friday Night
Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers after midnight. Humid with lows in the upper 60s. West winds 5 to 10 mph, becoming northwest after midnight. Chance of rain 40 percent.
Saturday
Sunny. Highs in the upper 80s. Northwest winds 5 to 10 mph.
Saturday Night
Mostly clear. Lows in the upper 60s.
Sunday
Mostly sunny. Highs in the upper 80s.
Sunday Night
Showers. Lows in the lower 60s. Chance of rain 80 percent.
Monday
Partly sunny. A chance of showers in the morning. Highs in the lower 80s. Chance of rain 50 percent.
Monday Night
Partly cloudy. Lows in the lower 60s.
Tuesday
Mostly sunny. Highs in the lower 80s.
Tuesday Night
Partly cloudy. Lows in the lower 60s.
Wednesday
Mostly sunny. Highs in the lower 80s.
Wednesday Night
Partly cloudy. Lows in the lower 60s.
Thursday
Partly sunny. A chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 30 percent.



Basemap Options
Click map to change the forecast location
Loading map...
213 PM EDT Thu Jun 11 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database