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 15.48°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.

59.9

°F

October 16, 09:54

Trend:

stable

Yesterday:

60.7°F

Tomorrow:

60.2°F

Sunrise:

05:33

Sunset:

18:00

Day Length:

12 h. 27 min.

San Juan in October

Minimum:

60.9°F

Average:

66.1°F

Maximum:

69.4°F

Sea water temperature in San Juan today

As of now, in San Juan, the water temperature is 59.9°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 1.8°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

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 maximum temperature for this date. The maximum temperature recorded for this date was 60.9°F on 2015, while the historical minimum was 55.1°F on 2021.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 60.2°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
Oct 2	56.4°F	56.8°F	58.2°F
Oct 3	58.0°F	56.5°F	58.4°F
Oct 4	58.5°F	56.9°F	58.2°F
Oct 5	58.7°F	57.4°F	58.5°F
Oct 6	58.9°F	57.8°F	58.3°F
Oct 7	59.0°F	58.0°F	58.4°F
Oct 8	57.0°F	58.4°F	58.4°F
Oct 9	57.1°F	56.5°F	58.3°F
Oct 10	57.2°F	56.9°F	58.2°F
Oct 11	57.7°F	55.8°F	58.1°F
Oct 12	57.9°F	55.8°F	58.1°F
Oct 13	57.5°F	56.7°F	58.2°F
Oct 14	60.5°F	57.7°F	58.5°F
Oct 15	60.7°F	57.4°F	58.4°F
Oct 16	59.9°F	57.3°F	58.1°F
Oct 17	60.2°F	58.3°F	58.4°F
Oct 18	60.2°F	59.0°F	58.4°F
Oct 19	59.9°F	56.6°F	58.2°F
Oct 20	60.4°F	57.1°F	58.7°F
Oct 21	60.2°F	57.4°F	58.5°F
Oct 22	60.2°F	57.3°F	58.4°F
Oct 23	60.2°F	57.8°F	58.4°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.