Water temperature in San Juan
66.4
°F
September 14, 18:13
Trend:
decreasingYesterday:
67.5°FTomorrow:
66.0°F
Sunrise:
Sunset:
Day Length:
11 h. 59 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 66.4°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 8.6°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 fall a bit.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 60.8°F on 2023, while the historical minimum was 56.2°F on 2019.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| 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 | 58.5°F |
| Sep 12 | 68.2°F | 57.5°F | 58.6°F |
| Sep 13 | 67.5°F | 57.4°F | 58.7°F |
| Sep 14 | 66.4°F | 57.7°F | 57.8°F |
| Sep 15 | 66.0°F | 57.3°F | 57.5°F |
| Sep 16 | 66.0°F | 57.3°F | 57.5°F |
| Sep 17 | 65.8°F | 57.1°F | 57.2°F |
| Sep 18 | 65.9°F | 58.1°F | 57.4°F |
| Sep 19 | 66.0°F | 57.3°F | 57.4°F |
| Sep 20 | 66.2°F | 57.5°F | 57.6°F |
| Sep 21 | 66.1°F | 58.0°F | 57.5°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.