Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fog/Mist
28°F
-2°C
| Humidity | 96% |
| Wind Speed | Calm |
| Barometer | 30.09 in (1019.1 mb) |
| Dewpoint | 27°F (-3°C) |
| Visibility | 3.00 mi |
| Last update | 18 Jan 12:56 am EST |
Extended Forecast for
Stony Brook NY
Winter Weather Advisory January 18, 10:00am until January 18, 10:00pm
Overnight

Low: 31 °F
Chance Snow
and Areas
Freezing FogSunday

High: 36 °F
Rain/Snow
Sunday Night
Low: 23 °F
Snow then
Chance SnowM.L.King Day
High: 32 °F
Mostly Sunny
then Mostly
Sunny and
BreezyMonday Night

Low: 17 °F
Partly Cloudy
Tuesday

High: 24 °F
Mostly Sunny
and BreezyTuesday Night

Low: 14 °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 31. Calm wind.
Sunday
Snow, possibly mixed with rain, becoming all snow after 4pm. High near 36. Calm wind becoming northeast around 6 mph in the afternoon. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Sunday Night
Snow, mainly before 10pm. Low around 23. Wind chill values between 15 and 20. North wind 6 to 8 mph becoming west after midnight. 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. Breezy, with a southwest wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 17. West wind 15 to 18 mph.
Tuesday
Mostly sunny, with a high near 24. Breezy.
Tuesday Night
Mostly clear, with a low around 14.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Partly sunny, with a high near 37.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 34.
Friday Night
Mostly cloudy, with a low around 26.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 36. Chance of precipitation is 30%.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Stony Brook NY
40.92°N 73.15°W (Elev. 36 ft)
40.92°N 73.15°W (Elev. 36 ft)
1:04 am EST Jan 18, 2026
1am EST Jan 18, 2026-6pm EST Jan 24, 2026



