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

80.9

°F

April 19, 08:50

Trend:

stable

Yesterday:

81.0°F

Tomorrow:

80.9°F

Sunrise:

06:05

Sunset:

18:42

Day Length:

12 h. 37 min.

San Juan in April

Minimum:

80.3°F

Average:

81.1°F

Maximum:

82.1°F

Sea water temperature in San Juan today

As of now, in San Juan, the water temperature is 80.9°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.5°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 closely matches the previous two weeks' average, indicating a stable trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 81.9°F on 2024, while the historical minimum was 79.3°F on 2022.

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 81.0°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 5 80.7°F 80.0°F 80.1°F
Apr 6 80.7°F 79.9°F 80.2°F
Apr 7 80.9°F 80.0°F 80.2°F
Apr 8 80.9°F 80.1°F 80.2°F
Apr 9 80.8°F 80.1°F 80.2°F
Apr 10 80.9°F 80.4°F 80.2°F
Apr 11 80.9°F 80.5°F 80.3°F
Apr 12 81.0°F 80.7°F 80.3°F
Apr 13 80.9°F 80.9°F 80.3°F
Apr 14 80.8°F 80.9°F 80.3°F
Apr 15 80.7°F 81.3°F 80.3°F
Apr 16 81.2°F 81.4°F 80.4°F
Apr 17 80.9°F 81.1°F 80.3°F
Apr 18 81.0°F 80.9°F 80.3°F
Apr 19 80.9°F 81.2°F 80.4°F
Apr 20 80.9°F 81.2°F 80.5°F
Apr 21 80.9°F 81.0°F 80.4°F
Apr 22 80.8°F 80.7°F 80.4°F
Apr 23 80.9°F 80.8°F 80.4°F
Apr 24 81.1°F 81.3°F 80.6°F
Apr 25 81.1°F 81.5°F 80.7°F
Apr 26 81.1°F 81.3°F 80.6°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 September 24, 2024, reaching a 87.7°F. While the coldest temperature occurred on February 16, 2018, dipping to 78.1°F. The average readings by season are 81.1°F in Winter, 80.5°F in Spring, 83.4°F in Summer, and 84.7°F in Autumn.