Water temperature in San Juan
56.9
°F
August 29, 14:12
Trend:
increasingYesterday:
56.7°FTomorrow:
57.2°F
Sunrise:
Sunset:
Day Length:
11 h. 46 min.San Juan in September
Minimum:
61.0°FAverage:
65.8°FMaximum:
68.9°FSea water temperature in San Juan today
As of now, in San Juan, the water temperature is 56.9°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 1.6°F lower 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 rise a bit.Recent sea temperature and forecast
Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 63.1°F on 2023, while the historical minimum was 56.1°F on 2022.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| Aug 15 | 58.5°F | 56.7°F | 58.7°F |
| Aug 16 | 59.5°F | 57.4°F | 58.7°F |
| Aug 17 | 59.6°F | 57.4°F | 58.4°F |
| Aug 18 | 60.4°F | 56.9°F | 58.3°F |
| Aug 19 | 59.5°F | 57.2°F | 58.3°F |
| Aug 20 | 58.8°F | 57.7°F | 58.2°F |
| Aug 21 | 58.7°F | 58.0°F | 58.2°F |
| Aug 22 | 60.0°F | 57.9°F | 58.4°F |
| Aug 23 | 59.9°F | 57.8°F | 58.4°F |
| Aug 24 | 59.1°F | 57.6°F | 58.2°F |
| Aug 25 | 59.3°F | 56.1°F | 58.5°F |
| Aug 26 | 57.8°F | 56.0°F | 58.4°F |
| Aug 27 | 56.8°F | 56.8°F | 58.2°F |
| Aug 28 | 56.7°F | 57.5°F | 58.1°F |
| Aug 29 | 56.9°F | 57.5°F | 58.5°F |
| Aug 30 | 57.2°F | 57.5°F | 58.8°F |
| Aug 31 | 56.8°F | 56.1°F | 58.4°F |
| Sep 1 | 57.0°F | 56.9°F | 58.6°F |
| Sep 2 | 56.6°F | 56.7°F | 58.2°F |
| Sep 3 | 56.4°F | 57.0°F | 58.0°F |
| Sep 4 | 56.5°F | 56.9°F | 58.1°F |
| Sep 5 | 56.3°F | 57.5°F | 57.9°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.