Average monthly water temperature in San Juan, Puerto Rico
On this page you find the mean water temperature over the year in San Juan (North Puerto Rico), Puerto Rico. Discover when the water is at its warmest and coolest, perfect for planning your visit.
In San Juan, water temperatures are consistently warm throughout the year. The warmest month is August, with an average water temperature of 29°C (84°F).
The coolest month is January, with an average temperature of 26°C (79°F). This makes San Juan a year-round destination for swimming and other water-based activities.
San Juan Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Juan - and find the best time to visit.
San Juan 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full San Juan climate overview or explore weather in Puerto Rico.
Popular this month
Where to go in September - average daytime high across popular destinations.
San Juan
31°C (88°F) Fajardo30°C (86°F) Luquillo30°C (86°F) Aguada
30°C (86°F) Rincon
30°C (86°F) Rio Grande31°C (88°F) Culebra30°C (86°F) Vieques30°C (86°F) 
