Water temperature in San Juan
86.3
°F
September 14, 05:13
Trend:
stableYesterday:
86.1°FTomorrow:
86.2°F
Sunrise:
Sunset:
Day Length:
12 h. 16 min.San Juan in September
Minimum:
80.5°FAverage:
81.0°FMaximum:
82.0°FSea water temperature in San Juan today
As of now, in San Juan, the water temperature is 86.3°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 1.2°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.Recent sea temperature and forecast
The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 86.4°F on 2023, while the historical minimum was 84.1°F on 2021.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| Aug 31 | 85.2°F | 85.7°F | 84.6°F |
| Sep 1 | 85.4°F | 85.6°F | 84.7°F |
| Sep 2 | 85.3°F | 85.7°F | 84.8°F |
| Sep 3 | 85.5°F | 85.7°F | 84.9°F |
| Sep 4 | 85.5°F | 85.7°F | 84.9°F |
| Sep 5 | 85.6°F | 85.6°F | 84.9°F |
| Sep 6 | 85.9°F | 85.6°F | 84.9°F |
| Sep 7 | 85.9°F | 85.9°F | 85.0°F |
| Sep 8 | 85.9°F | 86.1°F | 85.0°F |
| Sep 9 | 85.6°F | 86.1°F | 85.0°F |
| Sep 10 | 85.7°F | 85.9°F | 85.1°F |
| Sep 11 | 85.8°F | 85.9°F | 85.2°F |
| Sep 12 | 85.9°F | 85.9°F | 85.2°F |
| Sep 13 | 86.1°F | 86.1°F | 85.2°F |
| Sep 14 | 86.3°F | 86.3°F | 85.1°F |
| Sep 15 | 86.2°F | 86.4°F | 85.0°F |
| Sep 16 | 86.1°F | 86.5°F | 84.9°F |
| Sep 17 | 86.1°F | 86.4°F | 84.9°F |
| Sep 18 | 86.2°F | 86.3°F | 85.0°F |
| Sep 19 | 86.1°F | 86.5°F | 84.9°F |
| Sep 20 | 86.2°F | 86.9°F | 85.0°F |
| Sep 21 | 86.3°F | 87.3°F | 85.1°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.