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.

Fair

N/A

Humidity NA
Wind Speed NW 20 G 33 mph
Barometer 30.01 in
Dewpoint N/A
Visibility 10.00 mi
Last update 12 Jan 2:56 am EST
Extended Forecast for

Old Field NY

  • Overnight

    Overnight: Mostly clear, with a low around 32. Wind chill values between 20 and 25. Breezy, with a west wind around 24 mph, with gusts as high as 36 mph.

    Low: 32 °F

    Mostly Clear
    and Breezy

  • Monday

    Monday: Mostly sunny, with a high near 39. Wind chill values between 20 and 30. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 39 °F

    Mostly Sunny
    and Breezy
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 34. Southwest wind 11 to 15 mph.

    Low: 34 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 43. Southwest wind around 11 mph.

    High: 43 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. South wind around 15 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers before 1pm. Mostly cloudy, with a high near 45.

    High: 45 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers. Cloudy, with a low around 37.

    Low: 37 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of rain before 1pm, then a chance of rain and snow. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.

    High: 41 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 26. Blustery.

    Low: 26 °F

    Chance Snow
    and Blustery

Detailed Forecast

Overnight
Mostly clear, with a low around 32. Wind chill values between 20 and 25. Breezy, with a west wind around 24 mph, with gusts as high as 36 mph.
Monday
Mostly sunny, with a high near 39. Wind chill values between 20 and 30. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
Mostly clear, with a low around 34. Southwest wind 11 to 15 mph.
Tuesday
Mostly sunny, with a high near 43. Southwest wind around 11 mph.
Tuesday Night
Mostly cloudy, with a low around 40. South wind around 15 mph.
Wednesday
A 30 percent chance of showers before 1pm. Mostly cloudy, with a high near 45.
Wednesday Night
A 40 percent chance of showers. Cloudy, with a low around 37.
Thursday
A chance of rain before 1pm, then a chance of rain and snow. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.
Thursday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 26. Blustery.
Friday
A 30 percent chance of snow before 1pm. Partly sunny, with a high near 33. Breezy.
Friday Night
Partly cloudy, with a low around 28.
Saturday
Mostly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 30.
Sunday
A 30 percent chance of snow showers. Partly sunny, with a high near 36. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Field NY
 40.96°N 73.14°W (Elev. 30 ft)
Last Update:
1:57 am EST Jan 12, 2026
Forecast Valid:
3am EST Jan 12, 2026-6pm EST Jan 18, 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