Water temperature in San Juan
65.4
°F
September 20, 18:42
Trend:
stableYesterday:
64.9°FTomorrow:
65.4°F
Sunrise:
Sunset:
Day Length:
12 h. 4 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 65.4°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 7.8°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
Today's water temperature is slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 61.1°F on 2023, while the historical minimum was 55.5°F on 2022.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| 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 | 58.6°F |
| Sep 15 | 65.6°F | 57.3°F | 58.2°F |
| Sep 16 | 65.4°F | 57.3°F | 58.2°F |
| Sep 17 | 64.8°F | 57.1°F | 57.9°F |
| Sep 18 | 64.2°F | 58.1°F | 58.0°F |
| Sep 19 | 64.9°F | 57.3°F | 58.1°F |
| Sep 20 | 65.4°F | 57.5°F | 57.6°F |
| Sep 21 | 65.4°F | 58.0°F | 57.5°F |
| Sep 22 | 65.5°F | 57.2°F | 57.7°F |
| Sep 23 | 65.7°F | 57.1°F | 57.9°F |
| Sep 24 | 66.0°F | 57.4°F | 58.1°F |
| Sep 25 | 66.1°F | 57.7°F | 58.3°F |
| Sep 26 | 66.0°F | 57.9°F | 58.2°F |
| Sep 27 | 66.0°F | 58.6°F | 58.2°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.