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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
46°F
8°C
| Humidity | 83% |
| Wind Speed | SE 3 mph |
| Barometer | 29.97 in (1014.9 mb) |
| Dewpoint | 41°F (5°C) |
| Visibility | 10.00 mi |
| Last update | 11 Mar 5:56 am EDT |
Extended Forecast for
Port Jefferson NY
Today
High: 65 °F
Mostly Sunny
then Chance
ShowersTonight
Low: 42 °F
Chance
ShowersThursday
High: 52 °F⇓
Showers
Likely then
Rain/Snow
LikelyThursday Night
Low: 31 °F
Decreasing
CloudsFriday
High: 45 °F
Increasing
CloudsFriday Night
Low: 36 °F
Decreasing
CloudsSaturday
High: 47 °F
Sunny
Saturday Night
Low: 31 °F
Mostly Cloudy
Sunday
High: 48 °F
Cloudy
Detailed Forecast
Today
A 30 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 65. Light southeast wind becoming south 5 to 10 mph in the morning.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 42. South wind around 11 mph, with gusts as high as 22 mph.
Thursday
Rain showers likely before 2pm, then a slight chance of rain and snow showers. Cloudy, with a temperature rising to near 52 by 10am, then falling to around 40 during the remainder of the day. Northwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 31. Northwest wind 7 to 9 mph.
Friday
Increasing clouds, with a high near 45. West wind 5 to 15 mph becoming south in the afternoon.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 36.
Saturday
Sunny, with a high near 47.
Saturday Night
Mostly cloudy, with a low around 31.
Sunday
Cloudy, with a high near 48.
Sunday Night
Showers likely, mainly after 2am. Cloudy, with a low around 40. Chance of precipitation is 70%.
Monday
Showers. High near 54. Chance of precipitation is 90%.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 29.
Tuesday
Mostly sunny, with a high near 39.
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)
5:42 am EDT Mar 11, 2026
6am EDT Mar 11, 2026-6pm EDT Mar 17, 2026
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