Heavy Rainfall and Severe Thunderstorm Threats for the Plains and Southeast

A frontal boundary extending from the western High Plains to the Southeast will focus additional showers and thunderstorms this weekend. Some of these storms may become severe, alongside frequent lightning, and isolated instances of flash flooding. Meanwhile dry conditions will continue for the Great Basin where fire weather concerns linger. For the mid-Atlantic and Northeast, seasonable weather. Read More >

Hazardous Weather Conditions

Current conditions at

San Juan, Luis Munoz Marin International Airport (TJSJ)

Lat: 18.45°NLon: 66°WElev: 10ft.

A Few Clouds

79°F

26°C

Humidity	94%
Wind Speed	Calm
Barometer	30.01 in
Dewpoint	77°F (25°C)
Visibility	10.00 mi
Heat Index	83°F (28°C)
Last update	3 Aug 4:56 am AST

More Information:

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

Extended Forecast for

Guaynabo PR

Extreme Heat Warning August 3, 10:00am until August 3, 04:00pm

Click here for hazard details and duration

Extreme Heat Warning

Today
High: 91 °F
Isolated
Showers then
Showers
Likely
Tonight
Low: 78 °F
Scattered
Showers
Monday
High: 90 °F
Scattered
Showers
Monday Night
Low: 78 °F
Isolated
Showers
Tuesday
High: 90 °F
Scattered
Showers
Tuesday Night
Low: 77 °F
Scattered
Showers
Wednesday
High: 90 °F
Scattered
Showers then
Mostly Sunny
Wednesday Night
Low: 77 °F
Partly Cloudy
Thursday
High: 90 °F
Mostly Sunny

Detailed Forecast

Today

Showers likely, with thunderstorms also possible after 3pm. Partly sunny, with a high near 91. Heat index values as high as 106. East southeast wind 6 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

Tonight

Scattered showers, mainly after midnight. Partly cloudy, with a low around 78. East southeast wind around 8 mph. Chance of precipitation is 30%.

Monday

Scattered showers, mainly before noon. Widespread haze after noon. Mostly sunny, with a high near 90. Heat index values as high as 105. East wind 9 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

Monday Night

Isolated showers. Widespread haze before midnight. Partly cloudy, with a low around 78. East wind 7 to 9 mph. Chance of precipitation is 20%.

Tuesday

Scattered showers, mainly before noon. Mostly sunny, with a high near 90. East wind 9 to 15 mph. Chance of precipitation is 30%.

Tuesday Night

Scattered showers and thunderstorms. Mostly cloudy, with a low around 77. East northeast wind 6 to 9 mph. Chance of precipitation is 50%.

Wednesday

Scattered showers, mainly before noon. Mostly sunny, with a high near 90. East wind 7 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

Wednesday Night

Partly cloudy, with a low around 77. East southeast wind 5 to 8 mph.

Thursday

Mostly sunny, with a high near 90. East wind 8 to 15 mph, with gusts as high as 20 mph.

Thursday Night

Mostly clear, with a low around 77.

Friday

Mostly sunny, with a high near 91.

Friday Night

Partly cloudy, with a low around 77.

Saturday

Sunny, with a high near 90.