Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

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

Partly Cloudy

59°F

15°C

Humidity 58%
Wind Speed S 9 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 26 Mar 1:56 pm EDT
Detailed forecast for

Southwest Suffolk

This Afternoon
Mostly sunny. Highs in the upper 50s. Southwest winds 15 to 20 mph with gusts up to 30 mph.
Tonight
A slight chance of showers in the evening, then showers after midnight. Breezy with lows in the upper 40s. Southwest winds 15 to 25 mph, becoming west 20 to 25 mph after midnight. Gusts up to 35 mph. Chance of rain 90 percent.
Friday
Mostly cloudy. Showers, mainly in the morning. Highs in the lower 50s. North winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 90 percent.
Friday Night
Mostly cloudy. Cooler with lows in the lower 30s. North winds 5 to 10 mph. Gusts up to 20 mph after midnight.
Saturday
Mostly sunny. Highs in the lower 40s. Northwest winds 10 to 15 mph with gusts up to 25 mph.
Saturday Night
Mostly clear in the evening, then becoming partly cloudy. Lows around 30.
Sunday
Mostly sunny. Highs in the mid 40s.
Sunday Night
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 40s.
Monday
Partly sunny in the morning, then becoming mostly cloudy. Highs in the lower 50s.
Monday Night
Mostly cloudy. Lows in the mid 40s.
Tuesday
Mostly cloudy with a 30 percent chance of rain. Highs in the lower 50s.
Tuesday Night
Mostly cloudy with a 40 percent chance of rain. Lows in the mid 40s.
Wednesday
Mostly cloudy in the morning, then becoming partly sunny. A 40 percent chance of rain. Highs in the upper 50s.
Wednesday Night
Mostly cloudy with a 40 percent chance of rain. Lows in the mid 40s.
Thursday
Mostly cloudy. A chance of rain in the morning. Highs in the upper 50s. Chance of rain 30 percent.



Basemap Options
Click map to change the forecast location
Loading map...
241 PM EDT Thu Mar 26 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database