


Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
77°F
25°C
Humidity | 90% |
Wind Speed | SW 7 mph |
Barometer | 30.07 in (1018.0 mb) |
Dewpoint | 74°F (23°C) |
Visibility | 10.00 mi |
Heat Index | 78°F (26°C) |
Last update | 15 Jul 12:56 pm EDT |
Extended Forecast for
Stony Brook NY
This Afternoon
High: 86 °F
Slight Chance
T-stormsTonight
Low: 73 °F
Patchy Fog
Wednesday
High: 89 °F
Patchy Fog
then Mostly
SunnyWednesday Night
Low: 74 °F
Chance
T-stormsThursday
High: 91 °F
Chance
Showers then
Chance
T-stormsThursday Night
Low: 77 °F
Chance
T-storms then
Partly CloudyFriday
High: 90 °F
Mostly Sunny
then Chance
T-stormsFriday Night
Low: 71 °F
Chance
T-storms then
Partly CloudySaturday
High: 85 °F
Sunny
Detailed Forecast
This Afternoon
A 20 percent chance of showers and thunderstorms before 2pm. Mostly sunny, with a high near 86. South wind around 8 mph.
Tonight
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 73. South wind 5 to 7 mph becoming calm after midnight.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 89. Heat index values as high as 98. Light and variable wind becoming south 5 to 8 mph in the morning.
Wednesday Night
A 50 percent chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 74. Southwest wind 6 to 8 mph.
Thursday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. Southwest wind 7 to 11 mph.
Thursday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 77. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 71.
Saturday
Sunny, with a high near 85.
Saturday Night
Mostly cloudy, with a low around 71.
Sunday
A 50 percent chance of showers. Partly sunny, with a high near 86.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 71.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 86.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Stony Brook NY
40.92°N 73.12°W (Elev. 112 ft)
40.92°N 73.12°W (Elev. 112 ft)
6:03 am EDT Jul 15, 2025
1pm EDT Jul 15, 2025-6pm EDT Jul 21, 2025