Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fog/Mist
47°F
8°C
| Humidity | 97% |
| Wind Speed | SE 8 mph |
| Barometer | 29.87 in (1011.4 mb) |
| Dewpoint | 46°F (8°C) |
| Visibility | 2.50 mi |
| Wind Chill | 43°F (6°C) |
| Last update | 19 Apr 2:56 am EDT |
Extended Forecast for
Islip, Long Island Mac Arthur Airport NY
Freeze Watch April 21, 12:00am until April 21, 09:00am
Overnight

Low: 48 °F
Chance
Showers and
Patchy FogSunday

High: 54 °F
Showers and
Patchy FogSunday Night
Low: 39 °F
Chance
Showers then
Mostly ClearMonday

High: 51 °F
Chance
ShowersMonday Night

Low: 31 °F
Partly Cloudy
Tuesday

High: 50 °F
Sunny
Tuesday Night

Low: 40 °F
Increasing
CloudsWednesday

High: 58 °F
Partly Sunny
Wednesday Night

Low: 45 °F
Partly Cloudy
Detailed Forecast
Overnight
A 30 percent chance of showers, mainly after 5am. Patchy fog. Otherwise, cloudy, with a steady temperature around 48. Southeast wind around 5 mph.
Sunday
Showers, mainly before 5pm. Patchy fog before 11am. High near 54. East wind 7 to 12 mph becoming northwest 13 to 18 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 30 percent chance of showers before 8pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 39. West wind 3 to 8 mph.
Monday
A 30 percent chance of showers. Sunny through mid morning, then becoming mostly cloudy, with a high near 51. West wind 6 to 10 mph.
Monday Night
Partly cloudy, with a low around 31. North wind around 10 mph.
Tuesday
Sunny, with a high near 50.
Tuesday Night
Increasing clouds, with a low around 40.
Wednesday
Partly sunny, with a high near 58.
Wednesday Night
Partly cloudy, with a low around 45.
Thursday
Mostly sunny, with a high near 65.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 61.
Friday Night
Partly cloudy, with a low around 46.
Saturday
Partly sunny, with a high near 61.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
40.81°N 73.11°W (Elev. 98 ft)
40.81°N 73.11°W (Elev. 98 ft)
2:19 am EDT Apr 19, 2026
3am EDT Apr 19, 2026-6pm EDT Apr 25, 2026



