Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fog/Mist
65°F
18°C
| Humidity | 97% |
| Wind Speed | S 13 G 20 mph |
| Barometer | 29.84 in (1010.3 mb) |
| Dewpoint | 64°F (18°C) |
| Visibility | 4.00 mi |
| Last update | 16 Oct 10:56 am EDT |
Extended Forecast for
Great River NY
Today

High: 68 °F
Chance
ShowersTonight

Low: 45 °F
Showers
Saturday
High: 54 °F
Showers
Likely then
Mostly SunnySaturday Night

Low: 40 °F
Mostly Clear
Sunday

High: 57 °F
Sunny
Sunday Night

Low: 44 °F
Mostly Clear
Monday

High: 60 °F
Mostly Sunny
Monday Night

Low: 47 °F
Mostly Cloudy
Tuesday

High: 64 °F
Partly Sunny
Detailed Forecast
Today
A chance of showers before 2pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a steady temperature around 68. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Tonight
Showers and thunderstorms before 2am, then showers likely. Low around 45. Southwest wind 9 to 14 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely before 8am. Cloudy through mid morning, then gradual clearing, with a high near 54. North wind around 18 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Saturday Night
Mostly clear, with a low around 40. North wind 11 to 14 mph.
Sunday
Sunny, with a high near 57. Northeast wind around 9 mph.
Sunday Night
Mostly clear, with a low around 44.
Monday
Mostly sunny, with a high near 60.
Monday Night
Mostly cloudy, with a low around 47.
Tuesday
Partly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 49.
Wednesday
Sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 47.
Thursday
Mostly sunny, with a high near 60.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Great River NY
40.72°N 73.16°W (Elev. 13 ft)
40.72°N 73.16°W (Elev. 13 ft)
3:47 am EDT Oct 16, 2026
11am EDT Oct 16, 2026-6pm EDT Oct 22, 2026



