Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Partly Cloudy
40°F
4°C
| Humidity | 86% |
| Wind Speed | S 7 mph |
| Barometer | 30.47 in (1031.9 mb) |
| Dewpoint | 36°F (2°C) |
| Visibility | 10.00 mi |
| Wind Chill | 35°F (2°C) |
| Last update | 9 Apr 10:56 pm EDT |
Extended Forecast for
Port Jefferson NY
Tonight
Low: 37 °F
Patchy Fog
Friday
High: 57 °F
Patchy Fog
then Mostly
SunnyFriday Night
Low: 44 °F
Mostly Cloudy
Saturday
High: 58 °F
Sunny
Saturday Night
Low: 40 °F
Clear
Sunday
High: 55 °F
Mostly Sunny
Sunday Night
Low: 45 °F
Mostly Cloudy
Monday
High: 65 °F
Mostly Cloudy
Monday Night
Low: 54 °F
Mostly Cloudy
Detailed Forecast
Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 37. Light south wind.
Friday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 57. Light south wind increasing to 5 to 10 mph in the morning.
Friday Night
Mostly cloudy, with a low around 44. South wind 8 to 14 mph.
Saturday
Sunny, with a high near 58. Northwest wind around 13 mph.
Saturday Night
Clear, with a low around 40. North wind around 6 mph.
Sunday
Mostly sunny, with a high near 55.
Sunday Night
Mostly cloudy, with a low around 45.
Monday
Mostly cloudy, with a high near 65.
Monday Night
Mostly cloudy, with a low around 54.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
Mostly cloudy, with a low around 56.
Wednesday
Partly sunny, with a high near 71.
Wednesday Night
Mostly cloudy, with a low around 51.
Thursday
Partly sunny, with a high near 65.
Additional Forecasts and Information
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Forecast AreaABOUT 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)
2:47 pm EDT Apr 9, 2026
11pm EDT Apr 9, 2026-6pm EDT Apr 16, 2026
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