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Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Overcast
25°F
-4°C
| Humidity | 63% |
| Wind Speed | W 5 mph |
| Barometer | 30.15 in (1021.0 mb) |
| Dewpoint | 14°F (-10°C) |
| Visibility | 10.00 mi |
| Wind Chill | 19°F (-7°C) |
| Last update | 4 Feb 2:56 am EST |
Extended Forecast for
Port Jefferson NY
Overnight

Low: 20 °F
Mostly Cloudy
Wednesday

High: 31 °F
Gradual
ClearingWednesday Night

Low: 15 °F
Partly Cloudy
Thursday

High: 31 °F
Sunny
Thursday Night

Low: 15 °F
Partly Cloudy
Friday

High: 28 °F
Partly Sunny
Friday Night
Low: 17 °F
Chance Snow
Showers then
Snow Showers
LikelySaturday
High: 25 °F
Blustery.
Chance Snow
Showers then
Partly SunnySaturday Night

Low: 5 °F
Mostly Clear
and Blustery
Detailed Forecast
Overnight
Mostly cloudy, with a low around 20. West wind around 5 mph.
Wednesday
Cloudy through mid morning, then gradual clearing, with a high near 31. Wind chill values between 15 and 20. Northwest wind 6 to 13 mph.
Wednesday Night
Partly cloudy, with a low around 15. North wind 3 to 7 mph.
Thursday
Sunny, with a high near 31. Wind chill values between 10 and 20. North wind around 6 mph.
Thursday Night
Partly cloudy, with a low around 15. Light north wind.
Friday
Partly sunny, with a high near 28.
Friday Night
Snow showers likely, mainly after 1am. Mostly cloudy, with a low around 17. Chance of precipitation is 60%.
Saturday
A 30 percent chance of snow showers before noon. Partly sunny, with a high near 25. Blustery.
Saturday Night
Mostly clear, with a low around 5. Blustery.
Sunday
Mostly sunny and cold, with a high near 18.
Sunday Night
Partly cloudy, with a low around 8.
Monday
Mostly sunny, with a high near 24.
Monday Night
Partly cloudy, with a low around 14.
Tuesday
Mostly sunny, with a high near 30.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Port Jefferson NY
40.93°N 73.06°W (Elev. 161 ft)
40.93°N 73.06°W (Elev. 161 ft)
2:42 am EST Feb 4, 2026
3am EST Feb 4, 2026-6pm EST Feb 10, 2026



