Water temperature in San Juan
83.5
°F
January 8, 22:50
Trend:
stableYesterday:
83.2°FTomorrow:
83.4°F
Sunrise:
Sunset:
Day Length:
11 h. 37 min.San Juan in January
Minimum:
81.2°FAverage:
82.7°FMaximum:
83.8°FSea water temperature in San Juan today
As of now, in San Juan, the water temperature is 83.5°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 1.5°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 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 83.4°F on 2025, while the historical minimum was 80.6°F on 2019.
Daily water temperature in San Juan
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| Jan 1 | 83.8°F | 83.2°F | 82.7°F |
| Jan 2 | 83.6°F | 83.0°F | 82.6°F |
| Jan 3 | 83.3°F | 83.6°F | 82.6°F |
| Jan 4 | 83.4°F | 83.6°F | 82.6°F |
| Jan 5 | 83.1°F | 83.2°F | 82.4°F |
| Jan 6 | 83.2°F | 83.4°F | 82.4°F |
| Jan 7 | 83.2°F | 83.8°F | 82.2°F |
| Jan 8 | 83.5°F | 83.4°F | 82.0°F |
| Jan 9 | 83.4°F | 83.4°F | 81.8°F |
| Jan 10 | 83.3°F | 84.2°F | 81.8°F |
| Jan 11 | 83.4°F | 83.9°F | 81.8°F |
| Jan 12 | 83.2°F | 83.4°F | 81.7°F |
| Jan 13 | 83.2°F | 83.8°F | 81.7°F |
| Jan 14 | 83.1°F | 83.5°F | 81.6°F |
| Jan 15 | 83.2°F | 83.6°F | 81.7°F |
| Dec 25 | 83.7°F | 83.2°F | 82.9°F |
| Dec 26 | 83.6°F | 83.6°F | 82.9°F |
| Dec 27 | 83.4°F | 83.2°F | 82.7°F |
| Dec 28 | 83.3°F | 83.0°F | 82.7°F |
| Dec 29 | 83.3°F | 82.9°F | 82.7°F |
| Dec 30 | 83.1°F | 83.3°F | 82.7°F |
| Dec 31 | 83.2°F | 83.3°F | 82.7°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.
