Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

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

Mostly Cloudy

36°F

2°C

Humidity 82%
Wind Speed N 3 mph
Barometer 30.24 in (1024.0 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 20 Nov 5:56 am EST
Detailed forecast for

Northwest Suffolk

Today
Mostly sunny. Highs in the upper 40s. Northeast winds around 5 mph.
Tonight
Mostly clear in the evening, then becoming mostly cloudy. Lows in the mid 30s. Light and variable winds, becoming southwest around 5 mph after midnight.
Friday
Mostly cloudy. Highs in the mid 50s. Southwest winds 5 to 10 mph.
Friday Night
Cloudy with a 50 percent chance of rain. Lows in the lower 40s. Southwest winds 5 to 10 mph, becoming west after midnight.
Saturday
Mostly cloudy with a slight chance of rain in the morning, then mostly sunny in the afternoon. Highs around 50. North winds 10 to 15 mph. Chance of rain 20 percent.
Saturday Night
Partly cloudy. Lows in the lower 30s.
Sunday
Mostly sunny. Highs in the upper 40s.
Sunday Night
Partly cloudy. Lows in the upper 30s.
Monday
Mostly sunny. Highs in the lower 50s.
Monday Night
Mostly cloudy. Lows in the upper 30s.
Tuesday
Mostly cloudy. A chance of rain in the afternoon. Highs in the mid 50s. Chance of rain 30 percent.
Tuesday Night
Cloudy. A chance of rain in the evening, then rain likely after midnight. Near steady temperature in the upper 40s. Chance of rain 60 percent.
Wednesday
Partly sunny. A chance of rain in the morning. Highs in the upper 50s. Chance of rain 40 percent.



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1236 AM EST Thu Nov 20 2025
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database