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National Weather Service Today's Weather Impact Levels

National Weather Service Forecast for: San Juan, Puerto Rico  

Updated: 1:12 pm AST Aug 20, 2026

Heat Advisory
This
Afternoon
This Afternoon: Widespread haze. Sunny, with a high near 91. Heat index values as high as 102. East wind around 17 mph, with gusts as high as 22 mph.
Haze

Hi 91 °F
Tonight

Tonight: Isolated showers after midnight. Widespread haze. Mostly clear, with a low around 80. East wind 8 to 13 mph. Chance of precipitation is 10%.
Haze then
Isolated
Showers
Lo 80 °F
Friday

Friday: Isolated showers. Widespread haze. Sunny, with a high near 89. East northeast wind 10 to 17 mph. Chance of precipitation is 20%.
Isolated
Showers
Hi 89 °F
Friday
Night
Friday Night: Isolated showers. Widespread haze before 9pm. Partly cloudy, with a low around 79. East wind 8 to 10 mph. Chance of precipitation is 20%.
Isolated
Showers
Lo 79 °F
Saturday

Saturday: Scattered showers, mainly after noon. Mostly sunny, with a high near 92. East wind 9 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Scattered
Showers
Hi 92 °F
Saturday
Night
Saturday Night: Scattered showers. Partly cloudy, with a low around 79. East wind around 9 mph. Chance of precipitation is 30%.
Scattered
Showers
Lo 79 °F
Sunday

Sunday: Scattered showers before noon. Mostly sunny, with a high near 92. East wind 10 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
Scattered
Showers then
Sunny
Hi 92 °F
Sunday
Night
Sunday Night: Scattered showers. Mostly cloudy, with a low around 80. East wind 8 to 10 mph. Chance of precipitation is 40%.
Scattered
Showers
Lo 80 °F
Monday

Monday: Scattered showers, mainly before noon. Mostly sunny, with a high near 92. East wind 9 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Scattered
Showers then
Mostly Sunny
Hi 92 °F

National Weather Service Forecast Details

 

Caribbean Sea Satellite

NWS San Juan Doppler Radar

GRLevel3 Radar

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GRLevel3 radar from NWS station TJUA

Day 1 rainfall

Day 2 rainfall

Day 3 rainfall

National Weather Service in San Juan

Area Forecast Discussion (AFD)

Weather Summary unavailable, please try later.

NWS SJU Office Area Forecast Discussion

Tropical Atlantic Satellite

Tropical Weather Outlook

Saharan Air Layer

Wind Shear Tendency

Sea Surface Temperatures

Sea Surface Temperatures Anomalies

200hPa Velocity Potential Anomalies