Dangerous Heat to Continue through the Holiday Weekend; Severe Storms on Friday from the Plains to the Mid-Atlantic

Dangerous, record-breaking heat will continue across most of the central and eastern U.S through Friday then focusing across the eastern U.S. through the Independence Day holiday weekend. Peak heat indices of up to 115 degrees are possible. Isolated to scattered severe thunderstorms are possible from the northern/central Plains into the Midwest, Ohio Valley, and Mid-Atlantic Friday. Read More >

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

77°F

25°C

Humidity	88%
Wind Speed	SW 5 mph
Barometer	29.93 in (1013.2 mb)
Dewpoint	73°F (23°C)
Visibility	10.00 mi
Heat Index	78°F (26°C)
Last update	2 Jul 11:56 pm EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Stony Brook NY

Extreme Heat Warning July 3, 12:36am until July 4, 09:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning July 3, 12:36am until July 4, 09:00pm
NOW until 9:00pm Sat
Extreme Heat Warning
Overnight
Low: 77 °F
Clear
Friday
High: 97 °F
Sunny
Friday Night
Low: 77 °F
Slight Chance
T-storms then
Slight Chance
Showers
Independence Day
High: 91 °F
Mostly Sunny
then Showers
Likely
Saturday Night
Low: 73 °F
Showers
Likely
Sunday
High: 86 °F
Mostly Sunny
Sunday Night
Low: 69 °F
Chance
Showers
Monday
High: 80 °F
Chance
Showers

Detailed Forecast

Overnight

Clear, with a low around 77. Southwest wind around 5 mph becoming light and variable.

Friday

Sunny, with a high near 97. Heat index values as high as 109. West wind 3 to 7 mph.

Friday Night

A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly clear, with a low around 77. Southwest wind 5 to 7 mph becoming light and variable after midnight. Chance of precipitation is 20%.

Independence Day

Showers likely and possibly a thunderstorm after 2pm. Sunny, then becoming mostly cloudy during the afternoon, with a high near 91. Heat index values as high as 101. West wind 5 to 9 mph. Chance of precipitation is 70%.

Saturday Night

Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 73. West wind 5 to 7 mph becoming north after midnight. Chance of precipitation is 60%.

Sunday

Mostly sunny, with a high near 86.

Sunday Night

A 50 percent chance of showers after 8pm. Mostly cloudy, with a low around 69.

Monday

A 50 percent chance of showers. Mostly cloudy, with a high near 80.

Monday Night

Showers likely, mainly after 2am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.

Tuesday

Showers likely, mainly before 8am. Partly sunny, with a high near 80. Chance of precipitation is 60%.

Tuesday Night

Mostly cloudy, with a low around 67.