Water temperature in San Juan
85.7
°F
September 18, 14:16
Trend:
decreasingYesterday:
85.9°FTomorrow:
85.6°F
Sunrise:
Sunset:
Day Length:
12 h. 11 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 85.7°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 0.8°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 closely matches the previous two weeks' average, indicating a stable trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 86.6°F on 2023, while the historical minimum was 84.0°F on 2018.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| 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 | 85.2°F |
| Sep 15 | 86.1°F | 86.4°F | 85.1°F |
| Sep 16 | 86.0°F | 86.5°F | 85.0°F |
| Sep 17 | 85.9°F | 86.4°F | 85.0°F |
| Sep 18 | 85.7°F | 86.3°F | 85.0°F |
| Sep 19 | 85.6°F | 86.5°F | 84.9°F |
| Sep 20 | 85.8°F | 86.9°F | 85.0°F |
| Sep 21 | 85.8°F | 87.3°F | 85.1°F |
| Sep 22 | 85.9°F | 87.2°F | 85.1°F |
| Sep 23 | 85.9°F | 87.4°F | 85.1°F |
| Sep 24 | 85.9°F | 87.7°F | 85.2°F |
| Sep 25 | 86.0°F | 87.6°F | 85.2°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.