Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
65°F
18°C
| Humidity | 97% |
| Wind Speed | NW 5 mph |
| Barometer | 29.87 in (1011.3 mb) |
| Dewpoint | 64°F (18°C) |
| Visibility | 10.00 mi |
| Last update | 23 Jun 10:56 pm EDT |
Extended Forecast for
Stony Brook NY
Tonight
Low: 63 °F
Gradual
ClearingWednesday
High: 84 °F
Sunny
Wednesday Night
Low: 64 °F
Mostly Clear
Thursday
High: 84 °F
Sunny
Thursday Night
Low: 66 °F
Chance
Showers then
Showers
LikelyFriday
High: 84 °F
Showers
LikelyFriday Night
Low: 67 °F
Showers
LikelySaturday
High: 79 °F
Showers
LikelySaturday Night
Low: 65 °F
Chance
Showers then
Partly Cloudy
Detailed Forecast
Tonight
Cloudy early, then gradual clearing, with a low around 63. North wind 6 to 9 mph.
Wednesday
Sunny, with a high near 84. Northwest wind 7 to 9 mph.
Wednesday Night
Mostly clear, with a low around 64. West wind around 6 mph becoming calm after midnight.
Thursday
Sunny, with a high near 84. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
A chance of showers before 2am, then showers likely and possibly a thunderstorm between 2am and 5am, then showers likely after 5am. Mostly cloudy, with a low around 66. South wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers likely, mainly before 8am. Mostly cloudy, with a high near 84. Chance of precipitation is 60%.
Friday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Saturday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.
Saturday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 84.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Stony Brook NY
40.92°N 73.15°W (Elev. 36 ft)
40.92°N 73.15°W (Elev. 36 ft)
2:20 pm EDT Jun 23, 2026
11pm EDT Jun 23, 2026-6pm EDT Jun 30, 2026
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