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

79.9

°F

January 12, 01:51

Trend:

decreasing

Yesterday:

80.1°F

Tomorrow:

79.8°F

Sunrise:

06:21

Sunset:

17:44

Day Length:

11 h. 23 min.

San Juan in January

Minimum:

79.7°F

Average:

81.0°F

Maximum:

82.0°F

Sea water temperature in San Juan today

As of now, in San Juan, the water temperature is 79.9°F. It's safe to say that the water is comfortably warm for various water-related activities. 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 fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 81.4°F on 2024, while the historical minimum was 79.7°F on 2023.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the histoorical minimum and others when it was close to the historical maximum. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 79.7°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
Jan 1 81.2°F 81.1°F 81.0°F
Jan 2 81.4°F 81.0°F 81.0°F
Jan 3 81.2°F 80.8°F 80.8°F
Jan 4 81.1°F 80.8°F 80.9°F
Jan 5 81.2°F 81.1°F 80.9°F
Jan 6 81.1°F 80.9°F 80.9°F
Jan 7 80.9°F 81.2°F 80.8°F
Jan 8 80.7°F 80.8°F 80.7°F
Jan 9 80.5°F 80.7°F 80.6°F
Jan 10 80.2°F 80.9°F 80.7°F
Jan 11 80.1°F 80.7°F 80.7°F
Jan 12 79.9°F 80.5°F 80.5°F
Jan 13 79.8°F 80.4°F 80.4°F
Jan 14 79.8°F 80.3°F 80.4°F
Jan 15 79.8°F 80.2°F 80.4°F
Jan 16 79.7°F 80.1°F 80.3°F
Jan 17 79.6°F 80.2°F 80.2°F
Jan 18 79.7°F 80.2°F 80.3°F
Jan 19 79.7°F 79.9°F 80.3°F
Dec 29 81.5°F 80.5°F 81.2°F
Dec 30 81.7°F 80.5°F 81.1°F
Dec 31 81.1°F 81.2°F 81.2°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 June 7, 2020, reaching a 89.2°F. While the coldest temperature occurred on February 17, 2017, dipping to 78.5°F. The average readings by season are 80.9°F in Winter, 84.1°F in Spring, 86.1°F in Summer, and 84.3°F in Autumn.