Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

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

A Few Clouds

50°F

10°C

Humidity 66%
Wind Speed Calm
Barometer 30.27 in (1025.0 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 27 Apr 9:56 pm EDT
Detailed forecast for

Southwest Suffolk

Tonight
Mostly clear. Lows in the mid 40s. East winds around 5 mph, becoming north after midnight.
Tuesday
Sunny in the morning, then becoming partly sunny. Highs in the lower 60s. Northeast winds around 5 mph, becoming southeast in the afternoon.
Tuesday Night
Mostly cloudy. Lows in the mid 40s. Southeast winds around 5 mph.
Wednesday
Partly sunny in the morning, then becoming mostly cloudy. Highs in the upper 50s. Southeast winds 5 to 10 mph.
Wednesday Night
Showers. Lows in the mid 40s. Southeast winds 5 to 10 mph. Chance of rain near 100 percent.
Thursday
Showers. Highs in the mid 50s. Chance of rain near 100 percent.
Thursday Night
Mostly cloudy with a chance of showers in the evening, then partly cloudy after midnight. Lows in the mid 40s. Chance of rain 30 percent.
Friday
Sunny. Highs in the upper 50s.
Friday Night
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 40s.
Saturday
Partly sunny. A chance of showers in the afternoon. Highs in the mid 50s. Chance of rain 30 percent.
Saturday Night
Mostly cloudy with a chance of showers in the evening, then partly cloudy after midnight. Lows in the lower 40s. Chance of rain 30 percent.
Sunday
Mostly sunny. Highs in the upper 50s.
Sunday Night
Partly cloudy. Lows in the mid 40s.
Monday
Mostly sunny. Highs in the lower 60s.



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542 PM EDT Mon Apr 27 2026
 
 

Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database