Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Partly Cloudy
26°C
78°F
| Humidity | 85% |
| Wind Speed | S 15 km/h |
| Barometer | 1017.3 mb (30.05 in) |
| Dewpoint | 23°C (73°F) |
| Visibility | 16 km |
| Heat Index | 27°C (80°F) |
| Last update | 15 Jul 4:56 pm EDT |
Extended Forecast for
Islip NY
Heat Advisory July 16, 11:00am until July 17, 10:00pm
Tonight
Low: 23 °C
Patchy Fog
Wednesday
High: 29 °C
Mostly Sunny
Wednesday Night
Low: 23 °C
Chance
T-stormsThursday
High: 30 °C
Showers
LikelyThursday Night
Low: 24 °C
Showers
Likely then
Partly CloudyFriday
High: 31 °C
Mostly Sunny
Friday Night
Low: 21 °C
Partly Cloudy
Saturday
High: 28 °C
Sunny
Saturday Night
Low: 21 °C
Mostly Cloudy
Detailed Forecast
Tonight
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 23. South wind 5 to 10 km/h becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 29. Heat index values as high as 35. Light southwest wind becoming south 9 to 14 km/h in the morning.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23. Southwest wind 10 to 13 km/h.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 30. Heat index values as high as 36. Southwest wind 11 to 21 km/h. Chance of precipitation is 60%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 24. Southwest wind 11 to 13 km/h. Chance of precipitation is 60%.
Friday
Mostly sunny, with a high near 31.
Friday Night
Partly cloudy, with a low around 21.
Saturday
Sunny, with a high near 28.
Saturday Night
Mostly cloudy, with a low around 21.
Sunday
A 40 percent chance of showers after 8am. Partly sunny, with a high near 28.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 22.
Monday
Mostly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Mostly sunny, with a high near 27.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
Islip NY
40.73°N 73.22°W (Elev. 7 m)
40.73°N 73.22°W (Elev. 7 m)
3:16 pm EDT Jul 15, 2025
5pm EDT Jul 15, 2025-6pm EDT Jul 22, 2025
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
