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

22°C

72°F

Humidity 84%
Wind Speed E 11 km/h
Barometer 1019.2 mb (30.10 in)
Dewpoint 19°C (67°F)
Visibility 16 km
Last update 12 Jul 10:56 pm EDT
Extended Forecast for

Saint James NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 21. Calm wind.

    Low: 21 °C

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 28. East wind 8 to 13 km/h.

    High: 28 °C

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 22. Southeast wind 5 to 10 km/h becoming calm after midnight.

    Low: 22 °C

    Mostly Cloudy

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 29. South wind 5 to 11 km/h.

    High: 29 °C

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 22. South wind 5 to 10 km/h becoming calm after midnight. Chance of precipitation is 30%.

    Low: 22 °C

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: Sunny, with a high near 33.

    High: 33 °C

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 23.

    Low: 23 °C

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 32.

    High: 32 °C

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 23.

    Low: 23 °C

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 21. Calm wind.
Sunday
Partly sunny, with a high near 28. East wind 8 to 13 km/h.
Sunday Night
Mostly cloudy, with a low around 22. Southeast wind 5 to 10 km/h becoming calm after midnight.
Monday
A 40 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 29. South wind 5 to 11 km/h.
Monday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 22. South wind 5 to 10 km/h becoming calm after midnight. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 33.
Tuesday Night
Mostly clear, with a low around 23.
Wednesday
Sunny, with a high near 32.
Wednesday Night
Partly cloudy, with a low around 23.
Thursday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 33.
Thursday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 24.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 32.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 22.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 30.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint James NY
 40.88°N 73.16°W (Elev. 148 m)
Last Update:
6:14 pm EDT Jul 12, 2025
Forecast Valid:
11pm EDT Jul 12, 2025-6pm EDT Jul 19, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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