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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.N/A
| Humidity | NA |
| Wind Speed | NA |
| Barometer | NA |
| Dewpoint | N/A |
| Visibility | NA |
| Last update | *** Not a current observation *** |
Extended Forecast for
Port Jefferson NY
Overnight

Low: 36 °F
Chance Rain
Friday
High: 40 °F
Chance Rain
and Patchy
Fog then
CloudyFriday Night

Low: 34 °F
Chance
Drizzle and
Patchy FogSaturday
High: 48 °F
Chance
Drizzle and
Patchy Fog
then CloudySaturday Night
Low: 44 °F⇑
Chance
Showers then
Showers
LikelySunday

High: 56 °F
Decreasing
CloudsSunday Night

Low: 39 °F
Partly Cloudy
Monday

High: 55 °F
Mostly Sunny
Monday Night

Low: 42 °F
Partly Cloudy
Detailed Forecast
Overnight
A 30 percent chance of rain. Cloudy, with a steady temperature around 36. Northeast wind around 10 mph.
Friday
A 30 percent chance of rain before 7am. Patchy fog between 7am and 8am. Otherwise, cloudy, with a high near 40. Northeast wind 7 to 10 mph.
Friday Night
A chance of drizzle, mainly after 4am. Patchy fog before 8pm, then patchy fog after 9pm. Otherwise, cloudy, with a low around 34. Northeast wind around 6 mph becoming calm after midnight.
Saturday
A chance of drizzle before 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 48. Calm wind becoming south 5 to 7 mph in the afternoon.
Saturday Night
Showers likely, mainly after 1am. Cloudy, with a temperature rising to around 47 by 3am. Southwest wind 6 to 9 mph. Chance of precipitation is 70%.
Sunday
Cloudy, then gradually becoming mostly sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 55.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 52.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 49.
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)
1:11 am EST Mar 6, 2026
4am EST Mar 6, 2026-6pm EDT Mar 12, 2026


