Water temperature in San Juan
87.0
°F
July 10, 13:19
Trend:
stableYesterday:
87.0°FTomorrow:
87.0°F
Sunrise:
Sunset:
Day Length:
12 h. 44 min.San Juan in July
Minimum:
80.9°FAverage:
82.6°FMaximum:
84.3°FSea water temperature in San Juan today
As of now, in San Juan, the water temperature is 87.0°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 0.6°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to stay about the same.Recent sea temperature and forecast
Today's water temperature slightly varies from the average of the past two weeks. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 87.1°F on 2025, while the historical minimum was 85.4°F on 2016.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| Jun 26 | 87.1°F | 86.2°F | 86.6°F |
| Jun 27 | 87.0°F | 86.3°F | 86.6°F |
| Jun 28 | 87.0°F | 86.2°F | 86.6°F |
| Jun 29 | 86.8°F | 86.0°F | 86.6°F |
| Jun 30 | 86.6°F | 86.0°F | 86.6°F |
| Jul 1 | 86.2°F | 85.8°F | 86.4°F |
| Jul 2 | 86.3°F | 85.8°F | 86.4°F |
| Jul 3 | 86.1°F | 85.8°F | 86.5°F |
| Jul 4 | 87.0°F | 85.7°F | 86.7°F |
| Jul 5 | 87.1°F | 85.7°F | 86.5°F |
| Jul 6 | 87.8°F | 86.1°F | 86.5°F |
| Jul 7 | 87.4°F | 86.0°F | 86.4°F |
| Jul 8 | 87.4°F | 86.5°F | 86.5°F |
| Jul 9 | 87.0°F | 86.9°F | 86.4°F |
| Jul 10 | 87.0°F | 87.1°F | 86.4°F |
| Jul 11 | 87.0°F | 86.9°F | 86.4°F |
| Jul 12 | 87.0°F | 86.6°F | 86.4°F |
| Jul 13 | 87.2°F | 86.7°F | 86.5°F |
| Jul 14 | 87.2°F | 86.7°F | 86.6°F |
| Jul 15 | 87.3°F | 86.7°F | 86.7°F |
| Jul 16 | 87.2°F | 86.6°F | 86.6°F |
| Jul 17 | 87.4°F | 86.6°F | 86.7°F |
* actual - actual temperature values
** forecast - projected values for the next week
Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.
Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.
