Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
49°F
9°C
| Humidity | 97% |
| Wind Speed | NE 5 mph |
| Barometer | 30.04 in (1017.1 mb) |
| Dewpoint | 48°F (9°C) |
| Visibility | 10.00 mi |
| Wind Chill | 47°F (8°C) |
| Last update | 18 Apr 4:56 am EDT |
Extended Forecast for
Islip, Long Island Mac Arthur Airport NY
Today

High: 58 °F
Partly Sunny
Tonight
Low: 46 °F
Patchy Fog
then Chance
Showers and
Patchy FogSunday

High: 58 °F
Showers
Sunday Night

Low: 39 °F
Gradual
ClearingMonday
High: 52 °F
Mostly Sunny
then Slight
Chance
ShowersMonday Night

Low: 34 °F
Mostly Clear
Tuesday

High: 51 °F
Sunny
Tuesday Night

Low: 41 °F
Partly Cloudy
Wednesday

High: 60 °F
Partly Sunny
Detailed Forecast
Today
Partly sunny, with a high near 58. Light northeast wind becoming east 5 to 9 mph in the morning.
Tonight
A 30 percent chance of showers, mainly after 5am. Patchy fog after 11pm. Otherwise, cloudy, with a low around 46. Southeast wind around 5 mph becoming calm in the evening.
Sunday
A chance of showers and thunderstorms before 8am, then showers and possibly a thunderstorm between 8am and 2pm, then showers after 2pm. High near 58. South wind 5 to 14 mph becoming northwest in the morning. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind around 6 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 52. West wind 6 to 9 mph.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 60.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Sunny, with a high near 62.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Partly sunny, with a high near 62.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
40.78°N 73.09°W (Elev. 49 ft)
40.78°N 73.09°W (Elev. 49 ft)
2:16 am EDT Apr 18, 2026
5am EDT Apr 18, 2026-6pm EDT Apr 24, 2026



