Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
28°F
-2°C
| Humidity | 88% |
| Wind Speed | Calm |
| Barometer | 30.59 in (1036.0 mb) |
| Dewpoint | 25°F (-4°C) |
| Visibility | 10.00 mi |
| Last update | 9 Apr 4:56 am EDT |
Extended Forecast for
Port Jefferson NY
Today
High: 50 °F
Areas Frost
then SunnyTonight
Low: 38 °F
Mostly Clear
then Patchy
FogFriday
High: 57 °F
Patchy Fog
then Mostly
SunnyFriday Night
Low: 43 °F
Mostly Cloudy
Saturday
High: 58 °F
Sunny
Saturday Night
Low: 41 °F
Mostly Clear
Sunday
High: 55 °F
Mostly Sunny
Sunday Night
Low: 45 °F
Mostly Cloudy
Monday
High: 64 °F
Mostly Cloudy
Detailed Forecast
Today
Areas of frost before 9am. Otherwise, sunny, with a high near 50. Light south wind increasing to 8 to 13 mph in the morning.
Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 38. Southwest wind 3 to 8 mph.
Friday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 57. Light southwest wind becoming south 6 to 11 mph in the morning.
Friday Night
Mostly cloudy, with a low around 43. South wind 8 to 10 mph.
Saturday
Sunny, with a high near 58. Northwest wind 9 to 11 mph.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Mostly sunny, with a high near 55.
Sunday Night
Mostly cloudy, with a low around 45.
Monday
Mostly cloudy, with a high near 64.
Monday Night
Mostly cloudy, with a low around 54.
Tuesday
Partly sunny, with a high near 71.
Tuesday Night
Mostly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 71.
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)
3:30 am EDT Apr 9, 2026
5am EDT Apr 9, 2026-6pm EDT Apr 15, 2026
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