Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fog/Mist
29°F
-2°C
| Humidity | 96% |
| Wind Speed | Calm |
| Barometer | 30.08 in (1018.7 mb) |
| Dewpoint | 28°F (-2°C) |
| Visibility | 3.00 mi |
| Last update | 18 Jan 1:56 am EST |
Extended Forecast for
Islip, Long Island Mac Arthur Airport NY
Winter Weather Advisory January 18, 10:00am until January 19, 04:00am
Overnight

Low: 30 °F
Chance Snow
and Areas
Freezing FogSunday

High: 37 °F
Rain/Snow
Sunday Night
Low: 21 °F
Snow then
Chance SnowM.L.King Day

High: 32 °F
Mostly Sunny
Monday Night

Low: 15 °F
Partly Cloudy
Tuesday

High: 24 °F
Mostly Sunny
Tuesday Night

Low: 12 °F
Mostly Clear
Wednesday

High: 37 °F
Mostly Sunny
Wednesday Night

Low: 28 °F
Mostly Cloudy
Detailed Forecast
Overnight
A 40 percent chance of snow after 4am. Areas of freezing fog. Mostly cloudy, with a low around 30. Calm wind.
Sunday
Snow, possibly mixed with rain, becoming all snow after 4pm. High near 37. Calm wind becoming northeast around 6 mph in the afternoon. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Sunday Night
Snow, mainly before 10pm. Low around 21. Light and variable wind becoming northwest around 6 mph in the evening. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.
M.L.King Day
Mostly sunny, with a high near 32. Wind chill values between 15 and 20. West wind 6 to 15 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 15. West wind 10 to 13 mph, with gusts as high as 26 mph.
Tuesday
Mostly sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 12.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 25.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
40.8°N 73.09°W (Elev. 98 ft)
40.8°N 73.09°W (Elev. 98 ft)
1:04 am EST Jan 18, 2026
2am EST Jan 18, 2026-6pm EST Jan 24, 2026



