Current sea water temperature:
+81.9°F
| Minimum sea water temperature in May: | 84.6°F |
| Maximum sea water temperature in May: | 79.0°F |
| Average sea water temperature in May: | 81.2°F |
| more information | |
14 days
forecast
forecast
| San Juan |
monthly
weather
weather
| San Juan |
Sea water temperature for the last 10 days:
| May 16 | 81.9°F | May 11 | 82.6°F |
| May 15 | 82.0°F | May 10 | 82.4°F |
| May 14 | 81.5°F | May 9 | 82.0°F |
| May 13 | 81.7°F | May 8 | 82.2°F |
| May 12 | 81.9°F | May 7 | 82.4°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
May
May
| 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: 18:30
May 16, saturday
2100
79°F
W
11 mph
11 mph
May 17, sunday
0000
77°F
W
11 mph
11 mph
0300
77°F
W
11 mph
11 mph
0600
77°F
NW
10 mph
10 mph
0900
82°F
W
12 mph
12 mph
1200
84°F
W
16 mph
16 mph
1500
84°F
W
17 mph
17 mph
1800
81°F
W
15 mph
15 mph
