San Juan in January
Find out everything about the water temperature in San Juan in January. Average, minimum and maximum recorded temperatures as well as daily temperature in January for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in January
Minimum:
58.4 °F
Average:
66.2 °F
Maximum:
72.1 °F
Sea water temperature in San Juan in January
In the city of San Juan, the month of January is somewhat too cool for swimming. The minimum recorded temperature during this month was 58.4°F on January 11, 2023, with an average temperature being 66.2°F and a maximum temperature reaching 72.1°F on January 27, 2017.
| Date | 10 years average | 2025 | 2024 |
|---|---|---|---|
| Jan 1 | 64.5°F | 62.1°F | 66.3°F |
| Jan 2 | 65.1°F | 63.0°F | 66.1°F |
| Jan 3 | 65.1°F | 63.3°F | 66.1°F |
| Jan 4 | 65.4°F | 63.9°F | 67.2°F |
| Jan 5 | 65.3°F | 62.8°F | 66.0°F |
| Jan 6 | 65.7°F | 63.4°F | 65.3°F |
| Jan 7 | 65.9°F | 64.0°F | 65.6°F |
| Jan 8 | 65.9°F | 63.2°F | 67.0°F |
| Jan 9 | 65.8°F | 62.1°F | 65.8°F |
| Jan 10 | 66.1°F | 63.1°F | 66.2°F |
| Jan 11 | 65.5°F | 61.3°F | 65.4°F |
| Jan 12 | 65.8°F | 60.9°F | 65.4°F |
| Jan 13 | 65.5°F | 58.5°F | 65.0°F |
| Jan 14 | 65.5°F | 60.2°F | 65.8°F |
| Jan 15 | 65.4°F | 60.5°F | 65.1°F |
| Jan 16 | 65.9°F | 62.6°F | 67.8°F |
| Jan 17 | 66.5°F | 63.1°F | 68.1°F |
| Jan 18 | 66.4°F | 64.2°F | 69.4°F |
| Jan 19 | 66.5°F | 64.8°F | 69.5°F |
| Jan 20 | 66.7°F | 64.8°F | 70.2°F |
| Jan 21 | 66.7°F | 66.1°F | 69.9°F |
| Jan 22 | 66.7°F | 66.8°F | 69.7°F |
| Jan 23 | 67.0°F | 66.8°F | 71.9°F |
| Jan 24 | 66.5°F | 65.7°F | 68.6°F |
| Jan 25 | 67.2°F | 66.9°F | 70.1°F |
| Jan 26 | 67.4°F | 66.6°F | 69.6°F |
| Jan 27 | 67.5°F | 68.1°F | 69.8°F |
| Jan 28 | 67.3°F | 67.9°F | 65.8°F |
| Jan 29 | 67.2°F | 67.7°F | 66.7°F |
| Jan 30 | 67.2°F | 67.0°F | 66.9°F |
| Jan 31 | 66.7°F | 64.6°F | 65.3°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 65.4°F in Winter, 63.7°F in Spring, 59.5°F in Summer, and 59.0°F in Autumn.
The average temperature in January is slightly warmer than December's average of 62.9°F. And in February, the temperature is expected to rise further, potentially reaching an average of 67.3°F.