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

86.3

°F

September 22, 01:00

Trend:

stable

Yesterday:

86.3°F

Tomorrow:

86.3°F

Sunrise:

05:47

Sunset:

17:55

Day Length:

12 h. 8 min.

San Juan in September

Minimum:

81.2°F

Average:

82.7°F

Maximum:

84.5°F

Sea water temperature in San Juan today

As of now, in San Juan, the water temperature is 86.3°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 0.9°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 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 maximum temperature for this date. The maximum temperature recorded for this date was 87.1°F on 2020, while the historical minimum was 84.1°F on 2016.

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 86.6°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
Sep 8 83.3°F 85.2°F 85.3°F
Sep 9 83.3°F 84.8°F 85.3°F
Sep 10 83.2°F 85.0°F 85.2°F
Sep 11 82.9°F 85.1°F 85.2°F
Sep 12 82.8°F 84.7°F 85.1°F
Sep 13 83.8°F 85.5°F 85.1°F
Sep 14 83.9°F 85.0°F 85.1°F
Sep 15 84.3°F 85.2°F 85.2°F
Sep 16 84.8°F 85.2°F 85.2°F
Sep 17 84.8°F 86.1°F 85.2°F
Sep 18 84.9°F 86.1°F 85.3°F
Sep 19 85.8°F 86.0°F 85.6°F
Sep 20 86.1°F 85.8°F 85.5°F
Sep 21 86.3°F 85.5°F 85.4°F
Sep 22 86.3°F 85.5°F 85.4°F
Sep 23 86.3°F 85.3°F 85.4°F
Sep 24 86.3°F 85.1°F 85.4°F
Sep 25 86.7°F 85.2°F 85.8°F
Sep 26 86.8°F 85.2°F 85.9°F
Sep 27 86.8°F 85.1°F 85.9°F
Sep 28 86.9°F 85.2°F 86.0°F
Sep 29 86.7°F 84.7°F 85.8°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 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, 86.2°F in Summer, and 85.4°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Santa Maria 85.7°F 21mi
Zaragoza 86.2°F 33mi
Santiago 86.9°F 44mi

* current water temperature in this city

** straight line distance from San Juan