Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
38°F
3°C
| Humidity | 44% |
| Wind Speed | Calm |
| Barometer | 30.07 in (1018.3 mb) |
| Dewpoint | 18°F (-8°C) |
| Visibility | 10.00 mi |
| Last update | 17 Jan 5:56 am EST |
Extended Forecast for
Islip, Long Island Mac Arthur Airport NY
Today
High: 43 °F
Chance
Rain/Snow
then Rain
LikelyTonight
Low: 30 °F
Chance Rain
then Chance
Rain/SnowSunday

High: 36 °F
Rain/Snow
LikelySunday Night

Low: 22 °F
Chance Snow
M.L.King Day

High: 34 °F
Mostly Sunny
Monday Night

Low: 16 °F
Partly Cloudy
Tuesday

High: 25 °F
Sunny
Tuesday Night

Low: 15 °F
Mostly Clear
Wednesday

High: 36 °F
Mostly Sunny
Detailed Forecast
Today
A slight chance of snow before 9am, then rain likely. Mostly cloudy, with a high near 43. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Tonight
A chance of rain before 7pm, then a chance of rain and snow after 4am. Increasing clouds, with a low around 30. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Sunday
Snow likely, possibly mixed with rain, becoming all snow after 4pm. Cloudy, with a high near 36. Calm wind becoming west around 6 mph in the morning. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Sunday Night
A 30 percent chance of snow before 1am. Cloudy during the early evening, then gradual clearing, with a low around 22. Northwest wind 3 to 6 mph.
M.L.King Day
Mostly sunny, with a high near 34. West wind 7 to 14 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 16.
Tuesday
Sunny, with a high near 25.
Tuesday Night
Mostly clear, with a low around 15.
Wednesday
Mostly sunny, with a high near 36.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 39.
Thursday Night
Mostly cloudy, with a low around 22.
Friday
Mostly sunny, with a high near 33.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
40.8°N 73.09°W (Elev. 98 ft)
40.8°N 73.09°W (Elev. 98 ft)
4:17 am EST Jan 17, 2026
6am EST Jan 17, 2026-6pm EST Jan 23, 2026


