Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

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

A Few Clouds

68°F

20°C

Humidity 47%
Wind Speed E 6 mph
Barometer 30.40 in (1029.3 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 15 Sep 11:56 am EDT
Detailed forecast for

Southwest Suffolk

Today
Sunny. Highs around 70. Northeast winds 5 to 10 mph, becoming southeast this afternoon.
Tonight
Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 50s. Southeast winds 5 to 10 mph, becoming south after midnight.
Wednesday
Mostly sunny. Highs in the mid 70s. Southwest winds 5 to 10 mph.
Wednesday Night
Partly cloudy. Lows in the mid 60s. Southwest winds 5 to 10 mph.
Thursday
Mostly sunny. Highs in the upper 70s. Southwest winds 10 to 15 mph.
Thursday Night
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 60s.
Friday
Mostly sunny. Highs in the upper 70s.
Friday Night
Partly cloudy. Lows in the upper 50s.
Saturday
Mostly sunny. Highs in the lower 70s.
Saturday Night
Mostly cloudy. Lows in the lower 60s.
Sunday
Mostly cloudy in the morning, then becoming partly sunny. A 50 percent chance of showers. Highs in the upper 70s.
Sunday Night
Mostly cloudy with a 50 percent chance of showers. Lows in the lower 60s.
Monday
Mostly cloudy with a 50 percent chance of showers. Highs in the lower 70s.



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208 AM EDT Tue Sep 15 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database