Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Light Snow
37°F
3°C
| Humidity | 76% |
| Wind Speed | SW 10 G 20 mph |
| Barometer | 30.01 in (1016.3 mb) |
| Dewpoint | 30°F (-1°C) |
| Visibility | 3.00 mi |
| Wind Chill | 30°F (-1°C) |
| Last update | 17 Jan 1:56 pm EST |
Extended Forecast for
Port Jefferson NY
Winter Weather Advisory January 18, 10:00am until January 18, 10:00pm
This Afternoon

High: 37 °F
Rain/Snow
Tonight

Low: 33 °F
Chance Snow
Sunday

High: 34 °F
Snow
Sunday Night

Low: 27 °F
Chance Snow
M.L.King Day
High: 33 °F
Mostly Sunny
then Mostly
Sunny and
BreezyMonday Night

Low: 21 °F
Partly Cloudy
and BreezyTuesday

High: 24 °F
Mostly Sunny
Tuesday Night

Low: 18 °F
Mostly Clear
Wednesday

High: 37 °F
Mostly Sunny
Detailed Forecast
This Afternoon
Rain before 3pm, then rain and snow. Steady temperature around 37. Southwest wind 11 to 13 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tonight
A chance of snow before 7pm, then a chance of snow after 1am. Mostly cloudy, with a low around 33. West wind 5 to 11 mph. Chance of precipitation is 40%.
Sunday
Periods of snow, mainly after 7am. High near 34. West wind 5 to 7 mph becoming northeast in the afternoon. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Sunday Night
A 40 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 27. Wind chill values between 20 and 25. North wind 8 to 10 mph becoming northwest after midnight.
M.L.King Day
Mostly sunny, with a high near 33. Breezy, with a west wind 13 to 22 mph.
Monday Night
Partly cloudy, with a low around 21. Breezy.
Tuesday
Mostly sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 18.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 32.
Thursday
Mostly cloudy, with a high near 37.
Thursday Night
Partly cloudy, with a low around 23.
Friday
Mostly sunny, with a high near 32.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Port Jefferson NY
40.96°N 73.08°W (Elev. 3 ft)
40.96°N 73.08°W (Elev. 3 ft)
1:04 pm EST Jan 17, 2026
2pm EST Jan 17, 2026-6pm EST Jan 23, 2026



