Current sea water temperature:
+86.0°F
| Minimum sea water temperature in September: | 87.8°F |
| Maximum sea water temperature in September: | 82.6°F |
| Average sea water temperature in September: | 84.9°F |
| more information | |
14 days
forecast
forecast
| San Juan |
monthly
weather
weather
| San Juan |
Sea water temperature for the last 10 days:
| September 24 | 86.0°F | September 19 | 85.8°F |
| September 23 | 85.8°F | September 18 | 85.3°F |
| September 22 | 85.6°F | September 17 | 85.3°F |
| September 21 | 85.8°F | September 16 | 85.5°F |
| September 20 | 85.3°F | September 15 | 85.5°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:
2026
2025
2024
The average sea water temperature in September of 2026 was 85.3°F. The highest and lowest sea temperatures during the month were 86.0°F and 84.2°F.
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 84.5°F. The highest and lowest sea temperatures during the month were 85.5°F and 83.8°F.
current
weather
weather
| San Juan |
weather in
September
September
| 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: 21:45
September 25, friday
0000
81°F
N
3 mph
3 mph
0300
82°F
NW
5 mph
5 mph
0600
81°F
NW
8 mph
8 mph
0900
84°F
NW
9 mph
9 mph
1200
88°F
W
11 mph
11 mph
1500
88°F
W
14 mph
14 mph
1800
84°F
NW
13 mph
13 mph
2100
82°F
NW
8 mph
8 mph
