Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
45°F
7°C
| Humidity | 48% |
| Wind Speed | N 9 mph |
| Barometer | 30.40 in (1029.5 mb) |
| Dewpoint | 26°F (-3°C) |
| Visibility | 10.00 mi |
| Wind Chill | 40°F (4°C) |
| Last update | 12 Apr 12:56 am EDT |
Extended Forecast for
Islip, Long Island Mac Arthur Airport NY
Overnight

Low: 37 °F
Patchy Frost
Sunday

High: 54 °F
Patchy Frost
then Mostly
SunnySunday Night

Low: 44 °F
Mostly Cloudy
Monday
High: 65 °F
Partly Sunny
then Mostly
Cloudy and
BreezyMonday Night

Low: 54 °F
Slight Chance
ShowersTuesday

High: 70 °F
Partly Sunny
Tuesday Night

Low: 52 °F
Partly Cloudy
Wednesday

High: 72 °F
Mostly Sunny
Wednesday Night

Low: 56 °F
Mostly Cloudy
Detailed Forecast
Overnight
Patchy frost after 5am. Otherwise, clear, with a low around 37. North wind 5 to 7 mph becoming calm.
Sunday
Patchy frost before 7am. Otherwise, increasing clouds, with a high near 54. Northeast wind 6 to 11 mph becoming south in the afternoon. Winds could gust as high as 21 mph.
Sunday Night
Mostly cloudy, with a low around 44. South wind around 11 mph.
Monday
Partly sunny, with a high near 65. Breezy, with a southwest wind 11 to 20 mph.
Monday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 54. West wind 6 to 14 mph, with gusts as high as 24 mph.
Tuesday
Partly sunny, with a high near 70.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Mostly cloudy, with a low around 56.
Thursday
Partly sunny, with a high near 72.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 66.
Friday Night
Mostly cloudy, with a low around 48.
Saturday
Partly sunny, with a high near 62.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
40.78°N 73.09°W (Elev. 49 ft)
40.78°N 73.09°W (Elev. 49 ft)
6:36 pm EDT Apr 11, 2026
1am EDT Apr 12, 2026-6pm EDT Apr 18, 2026


