Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

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

Mostly Cloudy

68°F

20°C

Humidity 55%
Wind Speed NE 16 G 29 mph
Barometer 30.29 in (1025.6 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 22 Sep 1:56 pm EDT
Detailed forecast for

Southwest Suffolk

This Afternoon
Mostly cloudy. Highs in the upper 60s. Northeast winds 15 to 20 mph with gusts up to 30 mph.
Tonight
Mostly cloudy and breezy. Lows in the mid 50s. Northeast winds 15 to 25 mph with gusts up to 35 mph.
Wednesday
Partly sunny and windy. Highs in the upper 60s. Northeast winds 20 to 30 mph with gusts up to 40 mph.
Wednesday Night
Partly cloudy and breezy. Lows in the mid 50s. Northeast winds 15 to 25 mph with gusts up to 35 mph.
Thursday
Mostly sunny and breezy. Highs in the upper 60s. Northeast winds 15 to 25 mph with gusts up to 35 mph.
Thursday Night
Mostly cloudy and breezy. Lows in the mid 50s.
Friday
Partly sunny in the morning, then mostly cloudy with a chance of showers in the afternoon. Breezy with highs in the upper 60s. Chance of rain 40 percent.
Friday Night
Mostly cloudy with a 40 percent chance of showers. Windy with lows in the mid 50s.
Saturday
Mostly cloudy with a 50 percent chance of showers. Windy with highs in the mid 60s.
Saturday Night
Mostly cloudy with a chance of showers. Windy with lows in the mid 50s. Chance of rain 50 percent.
Sunday
Mostly cloudy with a 50 percent chance of showers. Breezy with highs in the upper 60s.
Sunday Night
Mostly cloudy with a 50 percent chance of showers. Lows in the mid 50s.
Monday
Mostly cloudy with a chance of showers in the morning, then partly sunny in the afternoon. Highs in the upper 60s. Chance of rain 30 percent.
Monday Night
Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 50s.
Tuesday
Mostly sunny. Highs in the upper 60s.



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255 PM EDT Tue Sep 22 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database