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

85.9

°F

May 6, 16:20

Trend:

stable

Yesterday:

85.9°F

Tomorrow:

85.9°F

Sunrise:

05:32

Sunset:

18:19

Day Length:

12 h. 47 min.

San Juan in May

Minimum:

82.1°F

Average:

83.0°F

Maximum:

84.2°F

Sea water temperature in San Juan today

As of now, in San Juan, the water temperature is 85.9°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 0.6°F lower 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 stay about the same.

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 minimum temperature for this date. The maximum temperature recorded for this date was 87.7°F on 2024, while the historical minimum was 85.7°F on 2017.

Over the last two weeks, the water temperature has stayed slightly lower than historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 86.0°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in San Juan

Date Current Year

actual* / forecast**

last year 10 years average
Apr 22 83.1°F 85.9°F 85.0°F
Apr 23 83.4°F 85.7°F 85.0°F
Apr 24 83.6°F 85.4°F 85.2°F
Apr 25 84.8°F 85.2°F 85.2°F
Apr 26 84.4°F 85.2°F 85.3°F
Apr 27 84.8°F 85.6°F 85.3°F
Apr 28 85.1°F 85.8°F 85.6°F
Apr 29 84.9°F 85.8°F 85.7°F
Apr 30 85.0°F 85.7°F 85.6°F
May 1 85.0°F 85.7°F 85.6°F
May 2 85.5°F 86.4°F 85.8°F
May 3 85.6°F 86.4°F 86.0°F
May 4 85.5°F 86.3°F 86.1°F
May 5 85.9°F 86.3°F 86.2°F
May 6 85.9°F 86.4°F 86.5°F
May 7 85.9°F 86.5°F 86.5°F
May 8 85.9°F 86.0°F 86.5°F
May 9 85.8°F 85.9°F 86.4°F
May 10 85.9°F 86.1°F 86.5°F
May 11 86.0°F 86.1°F 86.6°F
May 12 86.1°F 86.3°F 86.7°F
May 13 86.1°F 86.6°F 86.7°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.

Sea water temperature in San Juan by month

In San Juan, the water temperature is comfortable for swimming all year round.
The warmest water in San Juan was recorded on July 6, 2023, reaching a 88.8°F. While the coldest temperature occurred on February 8, 2016, dipping to 79.4°F. The average readings by season are 82.6°F in Winter, 84.6°F in Spring, 86.3°F in Summer, and 85.4°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Santa Maria 86.5°F 21mi
Zaragoza 85.7°F 33mi
Santiago 86.4°F 44mi

* current water temperature in this city

** straight line distance from San Juan