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Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Partly Cloudy
53°F
12°C
| Humidity | 86% |
| Wind Speed | Calm |
| Barometer | 30.04 in (1017.1 mb) |
| Dewpoint | 49°F (9°C) |
| Visibility | 10.00 mi |
| Last update | 15 May 11:56 pm EDT |
Extended Forecast for
Holtsville NY
Overnight
Low: 53 °F
Mostly Clear
Saturday
High: 74 °F
Sunny
Saturday Night
Low: 59 °F
Increasing
CloudsSunday
High: 83 °F
Sunny
Sunday Night
Low: 60 °F
Partly Cloudy
Monday
High: 73 °F
Sunny
Monday Night
Low: 58 °F
Mostly Clear
Tuesday
High: 80 °F
Sunny
Tuesday Night
Low: 63 °F
Mostly Clear
Detailed Forecast
Overnight
Mostly clear, with a low around 53. Calm wind.
Saturday
Sunny, with a high near 74. South wind 5 to 14 mph.
Saturday Night
Increasing clouds, with a low around 59. South wind 10 to 15 mph.
Sunday
Sunny, with a high near 83. West wind 7 to 13 mph.
Sunday Night
Partly cloudy, with a low around 60. Southwest wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 73.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 78.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 59.
Thursday
A 40 percent chance of showers. Partly sunny, with a high near 69.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 68.
Additional Forecasts and Information
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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)
7:37 pm EDT May 15, 2026
12am EDT May 16, 2026-6pm EDT May 22, 2026
Additional Resources
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Hourly Weather Forecast
