San Juan in December
Find out everything about the water temperature in San Juan in December. Average, minimum and maximum recorded temperatures as well as daily temperature in December for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in December
Minimum:
56.9 °F
Average:
63.0 °F
Maximum:
67.8 °F
Sea water temperature in San Juan in December
In the city of San Juan, the month of December is somewhat too cool for swimming. The minimum recorded temperature during this month was 56.9°F on December 4, 2022, with an average temperature being 63.0°F and a maximum temperature reaching 67.8°F on December 30, 2021.
| Date | 10 years average | 2024 | 2023 |
|---|---|---|---|
| Dec 1 | 61.6°F | 63.0°F | 62.6°F |
| Dec 2 | 61.8°F | 64.5°F | 63.6°F |
| Dec 3 | 61.6°F | 63.3°F | 62.8°F |
| Dec 4 | 61.4°F | 63.1°F | 62.9°F |
| Dec 5 | 61.2°F | 61.7°F | 60.9°F |
| Dec 6 | 61.9°F | 63.5°F | 62.0°F |
| Dec 7 | 61.6°F | 60.6°F | 61.3°F |
| Dec 8 | 61.6°F | 60.0°F | 61.0°F |
| Dec 9 | 61.8°F | 59.3°F | 63.0°F |
| Dec 10 | 62.1°F | 60.3°F | 64.1°F |
| Dec 11 | 62.4°F | 61.0°F | 62.8°F |
| Dec 12 | 62.4°F | 61.2°F | 63.1°F |
| Dec 13 | 62.5°F | 61.5°F | 64.1°F |
| Dec 14 | 62.9°F | 61.4°F | 64.0°F |
| Dec 15 | 62.9°F | 62.0°F | 62.1°F |
| Dec 16 | 63.2°F | 62.5°F | 64.5°F |
| Dec 17 | 63.4°F | 61.0°F | 64.8°F |
| Dec 18 | 63.8°F | 62.5°F | 65.2°F |
| Dec 19 | 63.9°F | 61.7°F | 65.0°F |
| Dec 20 | 63.6°F | 62.2°F | 64.7°F |
| Dec 21 | 63.8°F | 62.7°F | 65.2°F |
| Dec 22 | 63.9°F | 62.9°F | 65.6°F |
| Dec 23 | 63.5°F | 62.5°F | 64.0°F |
| Dec 24 | 63.7°F | 62.8°F | 63.4°F |
| Dec 25 | 63.7°F | 62.7°F | 63.5°F |
| Dec 26 | 64.2°F | 63.2°F | 64.2°F |
| Dec 27 | 64.4°F | 63.5°F | 64.0°F |
| Dec 28 | 64.4°F | 63.5°F | 63.1°F |
| Dec 29 | 64.7°F | 63.7°F | 64.3°F |
| Dec 30 | 64.8°F | 63.9°F | 63.8°F |
| Dec 31 | 64.5°F | 63.6°F | 66.0°F |
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 65.6°F in Winter, 63.7°F in Spring, 59.5°F in Summer, and 59.0°F in Autumn.
The average temperature in December is slightly warmer than November's average of 60.5°F. And in January, the temperature is expected to rise further, potentially reaching an average of 66.5°F.