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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Overcast
39°F
4°C
| Humidity | 65% |
| Wind Speed | S 9 mph |
| Barometer | 30.21 in (1023.0 mb) |
| Dewpoint | 28°F (-2°C) |
| Visibility | 10.00 mi |
| Wind Chill | 33°F (1°C) |
| Last update | 19 Mar 3:56 pm EDT |
Extended Forecast for
Port Jefferson NY
Tonight

Low: 34 °F
Mostly Cloudy
Friday
High: 51 °F
Mostly Sunny
then Chance
RainFriday Night

Low: 41 °F
Rain Likely
Saturday

High: 54 °F
Mostly Sunny
Saturday Night

Low: 38 °F
Mostly Cloudy
Sunday

High: 53 °F
Mostly Cloudy
Sunday Night

Low: 40 °F
Rain Likely
Monday
High: 53 °F
Rain Likely
then Chance
RainMonday Night

Low: 29 °F
Mostly Clear
Detailed Forecast
Tonight
Mostly cloudy, with a low around 34. South wind around 5 mph.
Friday
A 40 percent chance of rain after 2pm. Mostly sunny, with a high near 51. Light and variable wind becoming south 5 to 10 mph in the afternoon. Winds could gust as high as 22 mph.
Friday Night
Rain likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 41. South wind 7 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Mostly sunny, with a high near 54. Northwest wind 6 to 8 mph.
Saturday Night
Mostly cloudy, with a low around 38. Northwest wind around 5 mph becoming light and variable after midnight.
Sunday
Mostly cloudy, with a high near 53.
Sunday Night
Rain likely, mainly after 2am. Mostly cloudy, with a low around 40. Chance of precipitation is 60%.
Monday
Rain likely, mainly before 8am. Partly sunny, with a high near 53. Chance of precipitation is 60%.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Partly sunny, with a high near 46.
Wednesday Night
Mostly cloudy, with a low around 32.
Thursday
Partly sunny, with a high near 49.
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)
2:27 pm EDT Mar 19, 2026
4pm EDT Mar 19, 2026-6pm EDT Mar 26, 2026


