Water temperature in San Juan
64.8
°F
September 17, 18:01
Trend:
stableYesterday:
65.4°FTomorrow:
64.9°F
Sunrise:
Sunset:
Day Length:
12 h. 2 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 64.8°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 7.5°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 rise a bit.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 60.1°F on 2023, while the historical minimum was 54.9°F on 2022.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| 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 | 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 | 57.2°F |
| Sep 18 | 64.9°F | 58.1°F | 57.4°F |
| Sep 19 | 64.9°F | 57.3°F | 57.4°F |
| Sep 20 | 65.1°F | 57.5°F | 57.6°F |
| Sep 21 | 65.1°F | 58.0°F | 57.5°F |
| Sep 22 | 65.2°F | 57.2°F | 57.7°F |
| Sep 23 | 65.4°F | 57.1°F | 57.9°F |
| Sep 24 | 65.7°F | 57.4°F | 58.1°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.