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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
54°F
12°C
| Humidity | 72% |
| Wind Speed | SW 15 G 25 mph |
| Barometer | 30.09 in (1018.8 mb) |
| Dewpoint | 45°F (7°C) |
| Visibility | 10.00 mi |
| Wind Chill | 50°F (10°C) |
| Last update | 30 Mar 6:56 pm EDT |
Extended Forecast for
Port Jefferson NY
Tonight
Low: 50 °F
Slight Chance
Showers then
Showers
LikelyTuesday
High: 64 °F
Showers
Likely then
Chance
ShowersTuesday Night
Low: 52 °F
Partly Cloudy
then Slight
Chance
ShowersWednesday
High: 63 °F
Chance
Showers then
Showers
LikelyWednesday Night

Low: 43 °F
Showers
LikelyThursday

High: 50 °F
Chance
ShowersThursday Night

Low: 42 °F
Chance
ShowersFriday

High: 60 °F
Mostly Cloudy
Friday Night

Low: 50 °F
Chance
Showers
Detailed Forecast
Tonight
Showers likely, mainly after 5am. Mostly cloudy, with a low around 50. Southwest wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Showers likely, mainly before 8am. Partly sunny, with a high near 64. Southwest wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
A 20 percent chance of showers after 2am. Partly cloudy, with a low around 52. South wind around 14 mph.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 63. Southwest wind 11 to 14 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 43. Northeast wind 6 to 8 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
A 30 percent chance of showers before 2pm. Cloudy, with a high near 50.
Thursday Night
A chance of showers between 8pm and 2am. Cloudy, with a low around 42. Chance of precipitation is 30%.
Friday
Mostly cloudy, with a high near 60.
Friday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 50.
Saturday
Mostly cloudy, with a high near 63.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 47.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 61.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 43.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 54.
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)
5:53 pm EDT Mar 30, 2026
7pm EDT Mar 30, 2026-6pm EDT Apr 6, 2026


