National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

52°F

11°C

Humidity 83%
Wind Speed SW 10 mph
Barometer 30.23 in (1023.7 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 3 Apr 12:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 61. Southwest wind 6 to 9 mph.

    High: 61 °F

    Partly Sunny

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 52. Southwest wind 8 to 11 mph.

    Low: 52 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 64. Light and variable wind becoming east 5 to 8 mph in the morning.

    High: 64 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers, mainly after 8pm. Cloudy, with a low around 44. East wind 9 to 14 mph.

    Low: 44 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers. High near 61. South wind 13 to 15 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 61 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy during the early evening, then gradual clearing, with a low around 41.

    Low: 41 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 61. Southwest wind 6 to 9 mph.
Tonight
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 52. Southwest wind 8 to 11 mph.
Saturday
A 20 percent chance of showers after 2pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 64. Light and variable wind becoming east 5 to 8 mph in the morning.
Saturday Night
A 50 percent chance of showers, mainly after 8pm. Cloudy, with a low around 44. East wind 9 to 14 mph.
Sunday
Showers. High near 61. South wind 13 to 15 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Cloudy during the early evening, then gradual clearing, with a low around 41.
Monday
Mostly sunny, with a high near 54.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Partly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 33.
Wednesday
Sunny, with a high near 49.
Wednesday Night
Mostly clear, with a low around 38.
Thursday
Sunny, with a high near 56.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
2:20 am EDT Apr 3, 2026
Forecast Valid:
1pm EDT Apr 3, 2026-6pm EDT Apr 9, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation