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 15.92°C. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

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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.

60.7

°F

December 24, 05:08

Trend:

stable

Yesterday:

60.6°F

Tomorrow:

60.5°F

Sunrise:

05:29

Sunset:

18:31

Day Length:

13 h. 2 min.

San Juan in December

Minimum:

59.7°F

Average:

65.8°F

Maximum:

69.2°F

Sea water temperature in San Juan today

As of now, in San Juan, the water temperature is 60.7°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 3.0°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 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 66.4°F on 2015, while the historical minimum was 60.9°F on 2022.

latest data

last year

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. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 61.2°F, with minimum temperature starting at 60.5°F, while the maximum might reach 61.6°F.

Daily water temperature in San Juan

Date	Current Year actual* / forecast**	last year	10 years average
Dec 10	60.5°F	60.3°F	61.8°F
Dec 11	59.5°F	61.0°F	61.8°F
Dec 12	60.1°F	61.2°F	61.8°F
Dec 13	60.3°F	61.5°F	62.1°F
Dec 14	59.9°F	61.4°F	62.4°F
Dec 15	57.8°F	62.0°F	62.2°F
Dec 16	58.8°F	62.5°F	62.6°F
Dec 17	57.6°F	61.0°F	62.8°F
Dec 18	57.7°F	62.5°F	63.2°F
Dec 19	59.5°F	61.7°F	63.4°F
Dec 20	61.1°F	62.2°F	63.2°F
Dec 21	61.2°F	62.7°F	63.5°F
Dec 22	58.1°F	62.9°F	63.2°F
Dec 23	60.6°F	62.4°F	63.1°F
Dec 24	60.7°F	62.0°F	63.6°F
Dec 25	60.5°F	61.0°F	63.4°F
Dec 26	61.0°F	61.4°F	64.0°F
Dec 27	61.2°F	62.4°F	64.1°F
Dec 28	61.4°F	61.6°F	64.4°F
Dec 29	61.6°F	61.3°F	64.5°F
Dec 30	61.6°F	61.7°F	64.5°F
Dec 31	61.3°F	61.5°F	64.3°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 65.4°F in Winter, 63.5°F in Spring, 59.5°F in Summer, and 58.9°F in Autumn.