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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
66°F
19°C
| Humidity | 59% |
| Wind Speed | SW 12 mph |
| Barometer | 30.25 in (1024.3 mb) |
| Dewpoint | 51°F (11°C) |
| Visibility | 10.00 mi |
| Last update | 3 Oct 5:56 pm EDT |
Extended Forecast for
Port Jefferson NY
Tonight
Low: 55 °F
Clear
Saturday
High: 80 °F
Sunny
Saturday Night
Low: 62 °F
Mostly Clear
Sunday
High: 80 °F
Sunny
Sunday Night
Low: 59 °F
Mostly Clear
Monday
High: 77 °F
Sunny
Monday Night
Low: 63 °F
Mostly Clear
Tuesday
High: 77 °F
Mostly Sunny
Tuesday Night
Low: 61 °F
Chance
Showers then
Showers
Likely
Detailed Forecast
Tonight
Clear, with a low around 55. Southwest wind around 9 mph.
Saturday
Sunny, with a high near 80. West wind around 7 mph.
Saturday Night
Mostly clear, with a low around 62. Southwest wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 80. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 59. Southwest wind around 6 mph.
Monday
Sunny, with a high near 77.
Monday Night
Mostly clear, with a low around 63.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Wednesday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 70%.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 51.
Thursday
Sunny, with a high near 63.
Thursday Night
Mostly clear, with a low around 51.
Friday
Mostly sunny, with a high near 66.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Port Jefferson NY
40.95°N 73.05°W (Elev. 151 ft)
40.95°N 73.05°W (Elev. 151 ft)
2:14 pm EDT Oct 3, 2025
6pm EDT Oct 3, 2025-6pm EDT Oct 10, 2025
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
