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

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

45°F

7°C

Humidity 49%
Wind Speed N 8 mph
Barometer 29.96 in (1014.6 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 21 Feb 11:56 am EST
Extended Forecast for

5 Miles SSE Blue Point NY

Coastal Flood Watch February 22, 10:00pm until February 23, 04:00am
Blizzard Warning February 22, 06:00am until February 23, 06:00pm
Click here for hazard details and duration
Coastal Flood Watch
Blizzard Warning

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 41. Northwest wind 7 to 10 mph.

    High: 41 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of snow before 1am, then a chance of snow after 4am. Mostly cloudy, with a low around 34. Wind chill values between 25 and 30. East wind 6 to 15 mph. Chance of precipitation is 40%.

    Low: 34 °F

    Chance Snow

  • Sunday

    Sunday: Snow likely, mainly after 10am. Cloudy, with a high near 36. Wind chill values between 20 and 25. Windy, with an east wind 18 to 23 mph increasing to 28 to 33 mph in the afternoon. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

    High: 36 °F

    Snow Likely
    and Windy

  • Sunday Night

    Sunday Night: Snow. The snow could be heavy at times. Areas of blowing snow. Low around 31. Wind chill values between 15 and 20. Very windy, with a northeast wind 32 to 37 mph increasing to 40 to 45 mph in the evening. Chance of precipitation is 100%. New snow accumulation of 9 to 13 inches possible.

    Low: 31 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday

    Monday: Snow. The snow could be heavy at times. Areas of blowing snow. High near 32. Very windy, with a north wind 42 to 47 mph decreasing to 34 to 39 mph in the afternoon. Chance of precipitation is 90%. New snow accumulation of 5 to 9 inches possible.

    High: 32 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday Night

    Monday Night: Cloudy, then gradually becoming partly cloudy, with a low around 26. Windy.

    Low: 26 °F

    Decreasing
    Clouds and
    Windy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 31. Blustery.

    High: 31 °F

    Mostly Sunny
    and Blustery
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 39. Chance of precipitation is 30%.

    High: 39 °F

    Chance Snow
    then Chance
    Rain/Snow

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 41. Northwest wind 7 to 10 mph.
Tonight
A slight chance of snow before 1am, then a chance of snow after 4am. Mostly cloudy, with a low around 34. Wind chill values between 25 and 30. East wind 6 to 15 mph. Chance of precipitation is 40%.
Sunday
Snow likely, mainly after 10am. Cloudy, with a high near 36. Wind chill values between 20 and 25. Windy, with an east wind 18 to 23 mph increasing to 28 to 33 mph in the afternoon. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Sunday Night
Snow. The snow could be heavy at times. Areas of blowing snow. Low around 31. Wind chill values between 15 and 20. Very windy, with a northeast wind 32 to 37 mph increasing to 40 to 45 mph in the evening. Chance of precipitation is 100%. New snow accumulation of 9 to 13 inches possible.
Monday
Snow. The snow could be heavy at times. Areas of blowing snow. High near 32. Very windy, with a north wind 42 to 47 mph decreasing to 34 to 39 mph in the afternoon. Chance of precipitation is 90%. New snow accumulation of 5 to 9 inches possible.
Monday Night
Cloudy, then gradually becoming partly cloudy, with a low around 26. Windy.
Tuesday
Mostly sunny, with a high near 31. Blustery.
Tuesday Night
Mostly cloudy, with a low around 24.
Wednesday
A chance of snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 39. Chance of precipitation is 30%.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 34.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 41. Breezy.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 33.
Friday
A 30 percent chance of rain. Mostly sunny, with a high near 39.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Blue Point NY
 40.68°N 72.99°W (Elev. 0 ft)
Last Update:
3:41 am EST Feb 21, 2026
Forecast Valid:
12pm EST Feb 21, 2026-6pm EST Feb 27, 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