Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

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

Mostly Cloudy

65°F

18°C

Humidity 84%
Wind Speed Calm
Barometer 30.07 in (1018.3 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 12 Jul 2:56 am EDT
Detailed forecast for

Southwest Suffolk

Today
Sunny. Highs in the lower 80s. Northeast winds around 5 mph, becoming southeast this afternoon.
Tonight
Clear. Lows in the upper 60s. South winds 5 to 10 mph.
Monday
Sunny. Highs in the lower 80s. Southwest winds around 5 mph, increasing to south 10 to 15 mph in the afternoon.
Monday Night
Mostly clear. Lows around 70. Southwest winds 10 to 15 mph.
Tuesday
Sunny. Highs in the upper 80s. Southwest winds 15 to 20 mph. Gusts up to 30 mph in the afternoon. Heat index values in the mid 90s.
Tuesday Night
Mostly clear. Lows in the mid 70s.
Wednesday
Sunny. Highs in the lower 90s. Heat index values up to 105.
Wednesday Night
Partly cloudy. Lows in the lower 70s.
Thursday
Mostly sunny. Highs in the mid 80s.
Thursday Night
Partly cloudy. Lows in the lower 70s.
Friday
Mostly sunny. Highs in the mid 80s.
Friday Night
Partly cloudy. Lows in the lower 70s.
Saturday
Mostly sunny. Highs in the mid 80s.



Basemap Options
Click map to change the forecast location
Loading map...
234 AM EDT Sun Jul 12 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database