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.

Mostly Cloudy

55°F

13°C

Humidity 72%
Wind Speed N 9 mph
Barometer 30.15 in (1020.7 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 15 Oct 6:56 am EDT
Extended Forecast for

Saint James NY

  • Today

    Today: Mostly sunny, with a high near 61. North wind 5 to 9 mph.

    High: 61 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers, mainly after 5am. Increasing clouds, with a low around 50. Southeast wind around 6 mph.

    Low: 50 °F

    Mostly Clear
    then Chance
    Showers

  • Friday

    Friday: Showers likely before 2pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 71. Southwest wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

    High: 71 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday Night

    Friday Night: Showers and thunderstorms. Low around 45. Southwest wind 9 to 13 mph becoming northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 45 °F

    Showers

  • Saturday

    Saturday: Showers likely before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 53. North wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    High: 53 °F

    Showers
    Likely then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 61. North wind 5 to 9 mph.
Tonight
A 30 percent chance of showers, mainly after 5am. Increasing clouds, with a low around 50. Southeast wind around 6 mph.
Friday
Showers likely before 2pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 71. Southwest wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Friday Night
Showers and thunderstorms. Low around 45. Southwest wind 9 to 13 mph becoming northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 53. North wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Sunny, with a high near 55.
Sunday Night
Mostly clear, with a low around 43.
Monday
Sunny, with a high near 59.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 47.
Wednesday
Sunny, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint James NY
 40.88°N 73.16°W (Elev. 148 ft)
Last Update:
1:55 am EDT Oct 15, 2026
Forecast Valid:
7am EDT Oct 15, 2026-6pm EDT Oct 21, 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