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 15.15°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.

59.3

°F

November 29, 12:58

Trend:

decreasing

Yesterday:

61.3°F

Tomorrow:

58.6°F

Sunrise:

05:20

Sunset:

18:18

Day Length:

12 h. 58 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 59.3°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 2.9°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 64.4°F on 2015, while the historical minimum was 58.6°F on 2020.

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 shows a gradual cooling trend. The average temperature is expected to be 58.7°F, the minimum temperature may reach 58.2°F, and the maximum might stay at 59.0°F.

Daily water temperature in San Juan

Date	Current Year actual* / forecast**	last year	10 years average
Nov 15	58.0°F	60.8°F	60.2°F
Nov 16	57.8°F	61.1°F	60.4°F
Nov 17	57.7°F	61.3°F	60.4°F
Nov 18	57.2°F	63.0°F	60.7°F
Nov 19	57.9°F	62.5°F	60.1°F
Nov 20	54.2°F	62.9°F	59.9°F
Nov 21	54.4°F	64.0°F	60.3°F
Nov 22	55.1°F	64.4°F	60.4°F
Nov 23	57.4°F	64.1°F	61.2°F
Nov 24	61.1°F	63.6°F	61.8°F
Nov 25	62.5°F	63.9°F	62.2°F
Nov 26	61.2°F	61.8°F	61.7°F
Nov 27	60.9°F	63.5°F	61.9°F
Nov 28	61.3°F	63.0°F	61.8°F
Nov 29	59.3°F	63.6°F	62.1°F
Nov 30	58.6°F	63.2°F	61.5°F
Dec 1	58.7°F	63.0°F	61.5°F
Dec 2	58.9°F	64.5°F	61.8°F
Dec 3	58.7°F	63.3°F	61.6°F
Dec 4	58.5°F	63.1°F	61.4°F
Dec 5	58.2°F	61.7°F	61.1°F
Dec 6	59.0°F	63.5°F	61.8°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 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 65.5°F in Winter, 63.5°F in Spring, 59.5°F in Summer, and 58.9°F in Autumn.