All data are in degrees Fahrenheit

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Water temperature in San Juan

Detailed information about the current water temperature in San Juan. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in San Juan now

69.8

°F

February 23, 11:18

Trend:

increasing

Yesterday:

67.2°F

Tomorrow:

70.1°F

Sunrise:

06:00

Sunset:

18:28

Day Length:

12 h. 28 min.

San Juan in February

Minimum:

61.5°F

Average:

64.8°F

Maximum:

66.9°F

Sea water temperature in San Juan today

As of now, in San Juan, the water temperature is 69.8°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 2.3°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a noticeable 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 notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 70.7°F on 2016, while the historical minimum was 62.2°F on 2021.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 69.3°F, the minimum temperature may reach 67.7°F, and the maximum might stay at 70.1°F.

Daily water temperature in San Juan

Date Current Year

actual* / forecast**

last year 10 years average
Feb 9 64.9°F 66.6°F 66.7°F
Feb 10 68.3°F 66.9°F 67.5°F
Feb 11 66.9°F 67.5°F 67.4°F
Feb 12 67.0°F 68.3°F 67.4°F
Feb 13 68.3°F 68.3°F 67.1°F
Feb 14 64.9°F 68.4°F 66.4°F
Feb 15 65.8°F 69.9°F 66.8°F
Feb 16 63.8°F 71.7°F 66.6°F
Feb 17 65.0°F 69.2°F 66.8°F
Feb 18 65.6°F 68.2°F 66.4°F
Feb 19 65.3°F 68.5°F 66.3°F
Feb 20 65.8°F 68.0°F 66.6°F
Feb 21 65.7°F 69.6°F 66.9°F
Feb 22 67.2°F 66.2°F 67.0°F
Feb 23 69.8°F 69.3°F 67.5°F
Feb 24 70.1°F 69.5°F 67.8°F
Feb 25 69.7°F 71.1°F 67.3°F
Feb 26 69.9°F 71.0°F 67.6°F
Feb 27 69.9°F 70.5°F 67.6°F
Feb 28 69.7°F 67.0°F 67.4°F
Mar 1 68.1°F 66.9°F 67.2°F
Mar 2 67.7°F 64.8°F 66.8°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.

Sea water temperature in San Juan by month

In an average year, San Juan offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in San Juan was recorded on February 10, 2023, reaching a 72.2°F. While the coldest temperature occurred on October 19, 2021, dipping to 53.4°F. The average readings by season are 65.1°F in Winter, 63.3°F in Spring, 59.2°F in Summer, and 58.6°F in Autumn.