Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
A Few Clouds
72°F
22°C
| Humidity | 57% |
| Wind Speed | S 6 mph |
| Barometer | 30.21 in (1023.0 mb) |
| Dewpoint | 56°F (13°C) |
| Visibility | 10.00 mi |
| Last update | 9 Aug 7:56 pm EDT |
Extended Forecast for
Holtsville NY
Tonight
Low: 60 °F
Mostly Clear
then Patchy
FogSunday
High: 85 °F
Patchy Fog
then SunnySunday Night
Low: 63 °F
Mostly Clear
Monday
High: 88 °F
Sunny
Monday Night
Low: 69 °F
Mostly Clear
Tuesday
High: 88 °F
Sunny
Tuesday Night
Low: 71 °F
Mostly Clear
Wednesday
High: 89 °F
Sunny
Wednesday Night
Low: 72 °F
Partly Cloudy
Detailed Forecast
Tonight
Patchy fog after 2am. Otherwise, mostly clear, with a low around 60. South wind around 5 mph becoming calm in the evening.
Sunday
Patchy fog before 7am. Otherwise, sunny, with a high near 85. Calm wind becoming south 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 63. Southwest wind 3 to 6 mph.
Monday
Sunny, with a high near 88. Southwest wind 3 to 8 mph.
Monday Night
Mostly clear, with a low around 69. Southwest wind 5 to 7 mph.
Tuesday
Sunny, with a high near 88.
Tuesday Night
Mostly clear, with a low around 71.
Wednesday
Sunny, with a high near 89.
Wednesday Night
Partly cloudy, with a low around 72.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 71.
Friday
Mostly sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 69.
Saturday
Mostly sunny, with a high near 84.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
Holtsville NY
40.82°N 73.05°W (Elev. 112 ft)
40.82°N 73.05°W (Elev. 112 ft)
6:26 pm EDT Aug 9, 2025
8pm EDT Aug 9, 2025-6pm EDT Aug 16, 2025
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
