Current Sea Water Temperature:
+86.8°F
| Maximum Sea Water Temperature in December: | 88.6°F |
| Minimum Sea Water Temperature in December: | 83.6°F |
| Average water temperature in December: | 85.7°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 04 | 86.8°F | November 29 | 87.6°F |
| December 03 | 87.0°F | November 28 | 87.2°F |
| December 02 | 87.0°F | November 27 | 87.4°F |
| December 01 | 87.4°F | November 26 | 87.6°F |
| November 30 | 87.4°F | November 25 | 87.6°F |
When is the Warmest Sea for San Juan?
According to our data for the last three years for San Juan the highest average sea water temperature was in October, September and August.
Average Water Temperature by Month, °F
Sea Water Temperature in October
The average sea surface temperature in October 2025 for San Juan was 89.5°F. The maximum and minimum values were 88.6°F and 90.0°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for San Juan was 89.7°F. The maximum and minimum values were 89.2°F and 90.4°F respectively.
Sea Water Temperature in August
The average sea surface temperature in August 2025 for San Juan was 88.7°F. The maximum and minimum values were 88.0°F and 89.2°F respectively.
Puerto Rico Resorts:
NAME
F°
| Aguadilla |  |
+76 |
| Arecibo | |
+76 |
| Isabella | |
+78 |
| Mayaguez | |
+76 |
| Ponce |  |
+76 |
| San Juan | |
+82 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
San Juan
Local time: 01:19
05 dec, friday
| 0300 |  |
82°F | NW 7 mph |
| 0600 | |
80°F | NW 6 mph |
| 0900 |  |
82°F | W 9 mph |
| 1200 | |
86°F | W 16 mph |
| 1500 | |
84°F | W 14 mph |
| 1800 | |
82°F | W 11 mph |
| 2100 | |
82°F | W 11 mph |
06 dec, saturday
| 0000 | |
82°F | W 12 mph |