Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
35°F
2°C
| Humidity | 96% |
| Wind Speed | Calm |
| Barometer | 30.44 in (1030.8 mb) |
| Dewpoint | 34°F (1°C) |
| Visibility | 10.00 mi |
| Last update | 10 Apr 1:56 am EDT |
Extended Forecast for
Port Jefferson NY
Overnight
Low: 38 °F
Partly Cloudy
Friday
High: 61 °F
Mostly Sunny
Friday Night
Low: 44 °F
Partly Cloudy
then Slight
Chance
ShowersSaturday
High: 59 °F
Sunny
Saturday Night
Low: 40 °F
Mostly Clear
Sunday
High: 54 °F
Mostly Sunny
Sunday Night
Low: 45 °F
Mostly Cloudy
Monday
High: 65 °F
Mostly Cloudy
Monday Night
Low: 53 °F
Partly Cloudy
Detailed Forecast
Overnight
Partly cloudy, with a low around 38. Light south wind.
Friday
Mostly sunny, with a high near 61. South wind 5 to 11 mph.
Friday Night
A 20 percent chance of showers after midnight. Increasing clouds, with a low around 44. Southwest wind 9 to 14 mph.
Saturday
Sunny, with a high near 59. Northwest wind 9 to 13 mph.
Saturday Night
Mostly clear, with a low around 40. North wind around 6 mph.
Sunday
Mostly sunny, with a high near 54.
Sunday Night
Mostly cloudy, with a low around 45.
Monday
Mostly cloudy, with a high near 65.
Monday Night
Partly cloudy, with a low around 53.
Tuesday
Mostly sunny, with a high near 71.
Tuesday Night
Mostly cloudy, with a low around 54.
Wednesday
Partly sunny, with a high near 71.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 55.
Thursday
Partly sunny, with a high near 71.
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)
2:11 am EDT Apr 10, 2026
2am EDT Apr 10, 2026-6pm EDT Apr 16, 2026
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