What is the current water temperature in San Juan?

Q: What is the current water temperature in San Juan?

As of now, in San Juan, the water temperature is 19.03°C. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool.

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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.

66.3

°F

July 21, 21:36

Trend:

stable

Yesterday:

67.2°F

Tomorrow:

66.5°F

Sunrise:

06:27

Sunset:

17:47

Day Length:

11 h. 20 min.

San Juan in July

Minimum:

60.0°F

Average:

65.4°F

Maximum:

70.1°F

Sea water temperature in San Juan today

As of now, in San Juan, the water temperature is 66.3°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 7.1°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 rise a bit.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 63.5°F on 2023, while the historical minimum was 56.3°F on 2022.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the highest 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 66.3°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
Jul 7	65.0°F	59.7°F	59.8°F
Jul 8	65.1°F	58.3°F	59.7°F
Jul 9	65.6°F	58.9°F	60.0°F
Jul 10	64.6°F	59.3°F	59.9°F
Jul 11	64.4°F	59.6°F	59.7°F
Jul 12	65.4°F	58.7°F	60.0°F
Jul 13	66.5°F	59.4°F	60.1°F
Jul 14	67.0°F	59.5°F	60.3°F
Jul 15	67.2°F	59.6°F	60.2°F
Jul 16	66.9°F	59.7°F	60.2°F
Jul 17	66.6°F	59.6°F	59.9°F
Jul 18	66.3°F	59.4°F	59.8°F
Jul 19	66.1°F	58.6°F	59.8°F
Jul 20	67.2°F	58.8°F	59.8°F
Jul 21	66.3°F	58.5°F	59.1°F
Jul 22	66.5°F	59.3°F	59.4°F
Jul 23	66.5°F	59.8°F	59.3°F
Jul 24	66.7°F	59.7°F	59.6°F
Jul 25	66.6°F	59.5°F	59.4°F
Jul 26	66.0°F	59.4°F	58.8°F
Jul 27	65.9°F	59.3°F	58.7°F
Jul 28	66.1°F	60.0°F	59.0°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, 59.5°F in Summer, and 58.6°F in Autumn.