Water temperature in San Juan
68.6
°F
September 11, 15:34
Trend:
increasingYesterday:
68.5°FTomorrow:
68.6°F
Sunrise:
Sunset:
Day Length:
11 h. 57 min.San Juan in September
Minimum:
60.9°FAverage:
65.3°FMaximum:
68.9°FSea water temperature in San Juan today
As of now, in San Juan, the water temperature is 68.6°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 11.1°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 is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 60.4°F on 2023, while the historical minimum was 55.1°F on 2021.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| Aug 28 | 65.4°F | 56.7°F | 58.5°F |
| Aug 29 | 65.9°F | 56.9°F | 58.8°F |
| Aug 30 | 65.1°F | 57.3°F | 59.0°F |
| Aug 31 | 65.5°F | 56.6°F | 58.7°F |
| Sep 1 | 65.2°F | 57.0°F | 58.7°F |
| Sep 2 | 64.7°F | 56.9°F | 58.4°F |
| Sep 3 | 63.5°F | 56.9°F | 58.0°F |
| Sep 4 | 64.1°F | 56.9°F | 58.3°F |
| Sep 5 | 62.9°F | 56.3°F | 58.0°F |
| Sep 6 | 62.8°F | 56.7°F | 57.9°F |
| Sep 7 | 63.6°F | 58.1°F | 58.1°F |
| Sep 8 | 64.6°F | 57.8°F | 58.4°F |
| Sep 9 | 67.8°F | 56.2°F | 58.5°F |
| Sep 10 | 68.5°F | 56.7°F | 58.4°F |
| Sep 11 | 68.6°F | 56.8°F | 57.5°F |
| Sep 12 | 68.6°F | 57.5°F | 57.6°F |
| Sep 13 | 68.9°F | 57.4°F | 57.9°F |
| Sep 14 | 68.8°F | 57.7°F | 57.8°F |
| Sep 15 | 68.5°F | 57.3°F | 57.5°F |
| Sep 16 | 68.5°F | 57.3°F | 57.5°F |
| Sep 17 | 68.3°F | 57.1°F | 57.2°F |
| Sep 18 | 68.4°F | 58.1°F | 57.4°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.