Current sea water temperature:
+82.6°F
| Minimum sea water temperature in December: | 84.7°F |
| Maximum sea water temperature in December: | 80.2°F |
| Average sea water temperature in December: | 82.2°F |
| more information | |
14 days
forecast
forecast
| San Juan |
monthly
weather
weather
| San Juan |
Sea water temperature for the last 10 days:
| December 16 | 82.6°F | December 11 | 82.8°F |
| December 15 | 82.9°F | December 10 | 82.8°F |
| December 14 | 82.8°F | December 9 | 83.1°F |
| December 13 | 83.1°F | December 8 | 82.9°F |
| December 12 | 82.9°F | December 7 | 82.9°F |
Monthly sea water temperature, °F
When is the warmest sea in San Juan?
Based on the data about daily sea water temperature for the last three years the warmest sea in San Juan was noticed in October, September and August.
Monthly Sea Temperatures in San Juan, °F
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 85.5°F. The highest and lowest sea temperatures during the month were 86.0°F and 84.7°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 85.7°F. The highest and lowest sea temperatures during the month were 86.4°F and 85.3°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 84.8°F. The highest and lowest sea temperatures during the month were 85.3°F and 84.2°F.
current
weather
weather
| San Juan |
weather in
December
December
| San Juan |
Best time for vacation in San Juan
San Juan on a weather map
Places in Puerto Rico:
Name
°F
24 Hours Forecast
San Juan
Local time: 09:50
December 16, tuesday
1200
81°F
W
9 mph
9 mph
1500
81°F
W
14 mph
14 mph
1800
79°F
W
10 mph
10 mph
2100
77°F
NW
8 mph
8 mph
December 17, wednesday
0000
77°F
W
9 mph
9 mph
0300
77°F
NW
7 mph
7 mph
0600
79°F
W
7 mph
7 mph
0900
81°F
W
9 mph
9 mph
