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National Weather Service Today's Weather Impact Levels

National Weather Service Forecast for: San Juan, Puerto Rico  

Updated: 4:26 am AST Sep 7, 2026

Extreme Heat Warning
Overnight

Overnight: Scattered showers. Mostly cloudy, with a low around 79. East southeast wind around 5 mph. Chance of precipitation is 30%.
Scattered
Showers

Lo 79 °F
Labor
Day
Labor Day: Scattered showers and thunderstorms before noon, then scattered showers between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. Partly sunny, with a high near 90. Heat index values as high as 105. East southeast wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Showers
Likely

Hi 90 °F
Monday
Night
Monday Night: Isolated showers before midnight, then scattered showers and thunderstorms between midnight and 3am, then scattered showers after 3am. Mostly clear during the early evening, then becoming mostly cloudy, with a low around 79. East southeast wind around 8 mph. Chance of precipitation is 50%.
Isolated
Showers then
Scattered
Showers
Lo 79 °F
Tuesday

Tuesday: Scattered showers. Partly sunny, with a high near 89. Heat index values as high as 104. East wind 9 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.
Scattered
Showers

Hi 89 °F
Tuesday
Night
Tuesday Night: Scattered showers. Partly cloudy, with a low around 78. East wind 9 to 11 mph. Chance of precipitation is 30%.
Scattered
Showers

Lo 78 °F
Wednesday

Wednesday: Showers likely and possibly a thunderstorm before noon, then scattered showers and thunderstorms after noon. Mostly cloudy, with a high near 87. East wind 11 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Showers
Likely

Hi 87 °F
Wednesday
Night
Wednesday Night: Scattered showers. Mostly cloudy, with a low around 78. East wind 9 to 11 mph. Chance of precipitation is 40%.
Scattered
Showers

Lo 78 °F
Thursday

Thursday: Scattered showers. Partly sunny, with a high near 88. East wind 11 to 17 mph. Chance of precipitation is 50%.
Scattered
Showers

Hi 88 °F
Thursday
Night
Thursday Night: Partly cloudy, with a low around 79. East southeast wind around 9 mph.
Partly Cloudy

Lo 79 °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)

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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