Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
34°F
1°C
| Humidity | 89% |
| Wind Speed | Calm |
| Barometer | 30.09 in (1018.9 mb) |
| Dewpoint | 31°F (-1°C) |
| Visibility | 10.00 mi |
| Last update | 20 Apr 1:56 am EDT |
Extended Forecast for
Lake Grove NY
Frost Advisory April 20, 02:22am until April 20, 08:00am
Freeze Warning April 21, 12:00am until April 21, 09:00am
NOW until 8:00am Mon

Frost Advisory
Overnight

Low: 36 °F
Areas Frost
Monday

High: 52 °F
Chance
ShowersMonday Night

Low: 31 °F
Partly Cloudy
Tuesday

High: 53 °F
Sunny
Tuesday Night
Low: 41 °F
Partly Cloudy
then Slight
Chance
ShowersWednesday

High: 57 °F
Decreasing
CloudsWednesday Night

Low: 44 °F
Partly Cloudy
Thursday

High: 64 °F
Mostly Sunny
Detailed Forecast
Overnight
Areas of frost after 5am. Otherwise, clear, with a low around 36. Light west wind.
Monday
A 40 percent chance of showers after 8am. Areas of frost before 7am. Otherwise, partly sunny, with a high near 52. Light and variable wind becoming northwest 5 to 9 mph in the morning.
Monday Night
Partly cloudy, with a low around 31. Wind chill values between 25 and 30. Northwest wind 7 to 9 mph.
Tuesday
Sunny, with a high near 53. North wind 5 to 7 mph becoming southwest in the afternoon.
Tuesday Night
A 20 percent chance of showers after 2am. Increasing clouds, with a low around 41. South wind 6 to 8 mph.
Wednesday
Cloudy, then gradually becoming mostly sunny, with a high near 57.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 62.
Friday Night
A 30 percent chance of showers. Partly cloudy, with a low around 44.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 59.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 44.
Sunday
A 30 percent chance of showers. Mostly cloudy, with a high near 58.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Lake Grove NY
40.85°N 73.1°W (Elev. 144 ft)
40.85°N 73.1°W (Elev. 144 ft)
6:50 pm EDT Apr 19, 2026
2am EDT Apr 20, 2026-6pm EDT Apr 26, 2026



