Current sea water temperature:
+83.1°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: | 82.1°F |
| more information | |
14 days
forecast
forecast
| San Juan |
monthly
weather
weather
| San Juan |
Sea water temperature for the last 10 days:
| December 4 | 83.1°F | November 29 | 83.8°F |
| December 3 | 83.3°F | November 28 | 83.5°F |
| December 2 | 83.3°F | November 27 | 83.7°F |
| December 1 | 83.7°F | November 26 | 83.8°F |
| November 30 | 83.7°F | November 25 | 83.8°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: 23:53
December 05, friday
0000
79°F
NW
9 mph
9 mph
0300
79°F
NW
7 mph
7 mph
0600
77°F
NW
6 mph
6 mph
0900
79°F
W
9 mph
9 mph
1200
82°F
W
16 mph
16 mph
1500
81°F
W
14 mph
14 mph
1800
79°F
W
11 mph
11 mph
2100
79°F
W
11 mph
11 mph
