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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
39°F
4°C
| Humidity | 89% |
| Wind Speed | N 5 mph |
| Barometer | 30.50 in (1032.8 mb) |
| Dewpoint | 36°F (2°C) |
| Visibility | 10.00 mi |
| Wind Chill | 35°F (2°C) |
| Last update | 19 Oct 2:56 am EDT |
Extended Forecast for
Port Jefferson NY
Overnight
Low: 46 °F
Clear
Monday
High: 60 °F
Sunny
Monday Night
Low: 48 °F
Mostly Cloudy
Tuesday
High: 63 °F
Mostly Cloudy
Tuesday Night
Low: 47 °F
Partly Cloudy
Wednesday
High: 58 °F
Mostly Sunny
Wednesday Night
Low: 45 °F
Partly Cloudy
Thursday
High: 63 °F
Sunny
Thursday Night
Low: 46 °F
Clear
Detailed Forecast
Overnight
Clear, with a steady temperature around 46. Light east wind.
Monday
Sunny, with a high near 60. Northeast wind 8 to 10 mph.
Monday Night
Mostly cloudy, with a low around 48. Northeast wind 8 to 13 mph.
Tuesday
Mostly cloudy, with a high near 63. North wind around 15 mph.
Tuesday Night
Partly cloudy, with a low around 47. Northeast wind 11 to 17 mph, with gusts as high as 28 mph.
Wednesday
Mostly sunny, with a high near 58.
Wednesday Night
Partly cloudy, with a low around 45.
Thursday
Sunny, with a high near 63.
Thursday Night
Clear, with a low around 46.
Friday
Sunny, with a high near 57.
Friday Night
Mostly clear, with a low around 43.
Saturday
Sunny, with a high near 56.
Saturday Night
Mostly clear, with a low around 45.
Sunday
Sunny, with a high near 61.
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)
2:20 am EDT Oct 19, 2026
3am EDT Oct 19, 2026-6pm EDT Oct 25, 2026
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