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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
35°F
2°C
| Humidity | 85% |
| Wind Speed | E 8 mph |
| Barometer | 29.95 in (1014.4 mb) |
| Dewpoint | 31°F (-1°C) |
| Visibility | 10.00 mi |
| Wind Chill | 28°F (-2°C) |
| Last update | 20 Feb 3:56 am EST |
Extended Forecast for
Port Jefferson NY
Today
High: 39 °F
Rain
Tonight
Low: 30 °F
Rain Likely
then Mostly
CloudySaturday
High: 42 °F
Partly Sunny
Saturday Night
Low: 29 °F
Slight Chance
Rain/SnowSunday
High: 36 °F
Chance Snow
Sunday Night
Low: 29 °F
Snow Likely
Monday
High: 34 °F
Chance Snow
and BreezyMonday Night
Low: 24 °F
Mostly Cloudy
Tuesday
High: 35 °F
Mostly Sunny
Detailed Forecast
Today
Rain, mainly after 7am. High near 39. East wind 6 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
Rain likely, mainly before 7pm. Mostly cloudy, with a low around 30. East wind around 6 mph becoming light and variable. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Partly sunny, with a high near 42. West wind around 6 mph.
Saturday Night
A slight chance of rain and snow before 1am, then a slight chance of snow. Cloudy, with a low around 29. East wind 3 to 6 mph. Chance of precipitation is 20%.
Sunday
A 50 percent chance of snow. Cloudy, with a high near 36. East wind 9 to 14 mph, with gusts as high as 24 mph.
Sunday Night
Snow likely. Cloudy, with a low around 29. Chance of precipitation is 70%. New snow accumulation of 2 to 4 inches possible.
Monday
A 40 percent chance of snow before 1pm. Cloudy, with a high near 34. Breezy.
Monday Night
Mostly cloudy, with a low around 24.
Tuesday
Mostly sunny, with a high near 35.
Tuesday Night
Mostly cloudy, with a low around 22.
Wednesday
Mostly cloudy, with a high near 39.
Wednesday Night
Rain likely. Cloudy, with a low around 33. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 43.
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)
1:01 am EST Feb 20, 2026
4am EST Feb 20, 2026-6pm EST Feb 26, 2026
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