Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fog/Mist
43°F
6°C
| Humidity | 97% |
| Wind Speed | S 7 mph |
| Barometer | 30.17 in (1021.8 mb) |
| Dewpoint | 42°F (6°C) |
| Visibility | 1.50 mi |
| Wind Chill | 39°F (4°C) |
| Last update | 7 Mar 11:56 am EST |
Extended Forecast for
Port Jefferson NY
This Afternoon

High: 45 °F
Areas Drizzle
and Patchy
FogTonight

Low: 43 °F⇑
Chance
Showers and
Areas FogSunday

High: 55 °F
Chance Rain
Sunday Night

Low: 39 °F
Mostly Clear
Monday

High: 53 °F
Sunny
Monday Night

Low: 43 °F
Partly Cloudy
Tuesday

High: 56 °F
Mostly Sunny
Tuesday Night

Low: 43 °F
Mostly Cloudy
Wednesday

High: 53 °F
Chance Rain
Detailed Forecast
This Afternoon
Areas of drizzle before 1pm. Patchy fog. Otherwise, cloudy, with a high near 45. South wind around 8 mph.
Tonight
A 50 percent chance of showers after 10pm. Areas of fog before 1am. Otherwise, cloudy, with a temperature rising to around 49 by 5am. Southwest wind 9 to 13 mph.
Sunday
A 40 percent chance of rain, mainly before 1pm. Mostly cloudy, with a high near 55. Southwest wind 10 to 13 mph.
Sunday Night
Mostly clear, with a low around 39. West wind 6 to 9 mph.
Monday
Sunny, with a high near 53. Southwest wind 6 to 13 mph.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Mostly sunny, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 43.
Wednesday
A 40 percent chance of rain. Cloudy, with a high near 53.
Wednesday Night
Rain likely, mainly after 1am. Cloudy, with a low around 45. Breezy. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 50. Breezy.
Thursday Night
Partly cloudy, with a low around 32. Breezy.
Friday
Partly sunny, with a high near 41.
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)
11:59 am EST Mar 7, 2026
12pm EST Mar 7, 2026-6pm EDT Mar 13, 2026


