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

Scorching Heat West and South-Central; Monsoon Threats; Areas of Heavy Rain

Excessive heat continues in the West and South-Central U.S. Temperatures heat up in the west next week with 90s and 100s north to as high as 127 in the desert. Monsoon flow also continues with threats of flash floods, dust storms, and dry thunderstorms. A low system may produce excessive rain to portions of the Middle Atlantic. Areas of heavy rain from the Gulf to the Great Lakes. Read More >

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

75°F

24°C

Humidity 55%
Wind Speed E 18 G 24 mph
Barometer 30.07 in (1018.3 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 21 Jul 1:56 pm EDT
Extended Forecast for

Port Jefferson NY

  • This
    Afternoon

    This Afternoon: A 20 percent chance of showers. Mostly cloudy, with a steady temperature around 72. East wind around 16 mph.

    Slight Chance
    Showers

    High: 72 °F

  • Tonight

    Tonight: Showers before midnight, then showers and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Some of the storms could produce gusty winds and heavy rain. Low around 69. Windy, with an east wind 21 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Heavy Rain
    and Windy

    Low: 69 °F

  • Sunday

    Sunday: A 50 percent chance of showers. Mostly cloudy, with a high near 82. South wind around 15 mph.

    Chance
    Showers

    High: 82 °F

  • Sunday
    Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3am. Cloudy, with a low around 76. South wind 11 to 13 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Showers
    Likely

    Low: 76 °F

  • Monday

    Monday: Showers likely and possibly a thunderstorm before noon, then a chance of showers. Cloudy, with a high near 82. South wind 13 to 16 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Showers
    Likely

    High: 82 °F

  • Monday
    Night

    Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 75.

    Chance
    Showers

    Low: 75 °F

  • Tuesday

    Tuesday: A 30 percent chance of showers before noon. Mostly cloudy, with a high near 84.

    Chance
    Showers then
    Mostly Cloudy

    High: 84 °F

  • Tuesday
    Night

    Tuesday Night: Mostly cloudy, with a low around 74.

    Mostly Cloudy

    Low: 74 °F

  • Wednesday

    Wednesday: A 30 percent chance of showers. Mostly cloudy, with a high near 84.

    Chance
    Showers

    High: 84 °F

Detailed Forecast

This Afternoon
A 20 percent chance of showers. Mostly cloudy, with a steady temperature around 72. East wind around 16 mph.
Tonight
Showers before midnight, then showers and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Some of the storms could produce gusty winds and heavy rain. Low around 69. Windy, with an east wind 21 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 82. South wind around 15 mph.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3am. Cloudy, with a low around 76. South wind 11 to 13 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers likely and possibly a thunderstorm before noon, then a chance of showers. Cloudy, with a high near 82. South wind 13 to 16 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 75.
Tuesday
A 30 percent chance of showers before noon. Mostly cloudy, with a high near 84.
Tuesday Night
Mostly cloudy, with a low around 74.
Wednesday
A 30 percent chance of showers. Mostly cloudy, with a high near 84.
Wednesday Night
A 40 percent chance of showers. Cloudy, with a low around 73.
Thursday
A 50 percent chance of showers. Cloudy, with a high near 84.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 73.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 86.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 74.
Saturday
Click Map For Forecast
Disclaimer
Map Legend
Point Forecast:
Port Jefferson NY
 40.95°N 73.05°W (Elev. 151 ft)
Last Update:
1:22 pm EDT Jul 21, 2018
Forecast Valid:
3pm EDT Jul 21, 2018-6pm EDT Jul 28, 2018
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Northeast Radar Mosaic 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