Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Light Snow Fog/Mist
33°F
1°C
| Humidity | 96% |
| Wind Speed | SW 14 G 24 mph |
| Barometer | 29.71 in (1006.3 mb) |
| Dewpoint | 32°F (0°C) |
| Visibility | 5.00 mi |
| Wind Chill | 23°F (-5°C) |
| Last update | 25 Feb 10:56 am EST |
Extended Forecast for
Port Jefferson NY
Today

High: 38 °F
Chance Snow
Tonight

Low: 32 °F
Partly Cloudy
Thursday
High: 33 °F
Mostly Sunny
then Chance
SnowThursday Night

Low: 28 °F
Slight Chance
SnowFriday

High: 35 °F
Mostly Sunny
Friday Night

Low: 30 °F
Partly Cloudy
Saturday

High: 42 °F
Mostly Sunny
Saturday Night

Low: 30 °F
Partly Cloudy
Sunday

High: 36 °F
Partly Sunny
Detailed Forecast
Today
A 30 percent chance of snow before noon. Cloudy, then gradually becoming mostly sunny, with a high near 38. Wind chill values between 25 and 30. Southwest wind 15 to 18 mph.
Tonight
Partly cloudy, with a low around 32. Southwest wind around 14 mph.
Thursday
A 30 percent chance of snow after 1pm. Partly sunny, with a steady temperature around 33. Wind chill values between 25 and 30. West wind 7 to 10 mph.
Thursday Night
A 20 percent chance of snow before 1am. Mostly cloudy, with a low around 28. North wind around 6 mph.
Friday
Mostly sunny, with a high near 35. North wind around 6 mph becoming southwest in the afternoon.
Friday Night
Partly cloudy, with a low around 30.
Saturday
Mostly sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Partly sunny, with a high near 36.
Sunday Night
Partly cloudy, with a low around 22.
Monday
A 40 percent chance of snow. Mostly cloudy, with a high near 28.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 22.
Tuesday
A 30 percent chance of snow. Partly sunny, with a high near 33.
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)
9:51 am EST Feb 25, 2026
11am EST Feb 25, 2026-6pm EST Mar 3, 2026


