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

70°F

21°C

Humidity 71%
Wind Speed W 5 mph
Barometer 29.96 in (1014.4 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 11 Sep 7:56 am EDT
Extended Forecast for

Saint James NY

  • Today

    Today: Mostly sunny, with a high near 77. Northwest wind 7 to 11 mph.

    High: 77 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 59. Northwest wind around 6 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: Patchy fog before 7am. Otherwise, increasing clouds, with a high near 77. East wind 5 to 9 mph becoming south in the afternoon.

    High: 77 °F

    Patchy Fog
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then showers and possibly a thunderstorm after 2am. Low around 65. South wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 65 °F

    Chance
    Showers then
    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm, mainly before 2pm. High near 79. Southeast wind 8 to 11 mph becoming northwest in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 79 °F

    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 77. Northwest wind 7 to 11 mph.
Tonight
Mostly clear, with a low around 59. Northwest wind around 6 mph becoming calm in the evening.
Saturday
Patchy fog before 7am. Otherwise, increasing clouds, with a high near 77. East wind 5 to 9 mph becoming south in the afternoon.
Saturday Night
A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then showers and possibly a thunderstorm after 2am. Low around 65. South wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers and possibly a thunderstorm, mainly before 2pm. High near 79. Southeast wind 8 to 11 mph becoming northwest in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
Partly cloudy, with a low around 65.
Monday
Mostly sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
A 30 percent chance of showers. Partly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint James NY
 40.88°N 73.16°W (Elev. 148 ft)
Last Update:
3:39 am EDT Sep 11, 2026
Forecast Valid:
8am EDT Sep 11, 2026-6pm EDT Sep 17, 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