San Juan in October
Find out everything about the water temperature in San Juan in October. Average, minimum and maximum recorded temperatures as well as daily temperature in October for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in October
Minimum:
53.4 °F
Average:
59.0 °F
Maximum:
70.6 °F
Sea water temperature in San Juan in October
In the city of San Juan, the month of October is too cold for swimming. The minimum recorded temperature during this month was 53.4°F on October 19, 2021, with an average temperature being 59.0°F and a maximum temperature reaching 70.6°F on October 16, 2026.
| Date | 10 years average | 2026 | 2025 |
|---|---|---|---|
| Oct 1 | 58.6°F | 65.8°F | 57.1°F |
| Oct 2 | 58.6°F | 66.2°F | 56.4°F |
| Oct 3 | 58.8°F | 66.3°F | 58.0°F |
| Oct 4 | 58.5°F | 65.8°F | 58.5°F |
| Oct 5 | 58.8°F | 66.5°F | 58.7°F |
| Oct 6 | 58.6°F | 66.3°F | 58.9°F |
| Oct 7 | 58.8°F | 67.0°F | 59.0°F |
| Oct 8 | 58.9°F | 67.4°F | 57.0°F |
| Oct 9 | 59.0°F | 68.7°F | 57.1°F |
| Oct 10 | 58.8°F | 68.0°F | 57.2°F |
| Oct 11 | 58.7°F | 68.1°F | 57.7°F |
| Oct 12 | 58.8°F | 69.5°F | 57.9°F |
| Oct 13 | 58.9°F | 68.8°F | 57.5°F |
| Oct 14 | 59.2°F | 69.3°F | 60.5°F |
| Oct 15 | 59.1°F | 69.3°F | 60.7°F |
| Oct 16 | 59.1°F | 70.6°F | 59.9°F |
| Oct 17 | 59.3°F | 69.9°F | 60.0°F |
| Oct 18 | 59.4°F | 69.8°F | 60.2°F |
| Oct 19 | 59.1°F | 70.2°F | 59.8°F |
| Oct 20 | 59.5°F | 69.8°F | 59.1°F |
| Oct 21 | 59.2°F | 69.6°F | 58.6°F |
| Oct 22 | 59.3°F | 70.0°F | 58.5°F |
| Oct 23 | 59.2°F | 68.7°F | 59.1°F |
| Oct 24 | 59.2°F | 68.9°F | 58.8°F |
| Oct 25 | 58.9°F | 67.6°F | 59.1°F |
| Oct 26 | 58.9°F | 68.7°F | 59.4°F |
| Oct 27 | 59.1°F | 69.0°F | 58.6°F |
| Oct 28 | 59.2°F | 70.1°F | 57.1°F |
| Oct 29 | 58.8°F | 68.8°F | 57.0°F |
| Oct 30 | 59.2°F | 69.3°F | 58.4°F |
| Oct 31 | 59.0°F | 68.3°F | 58.0°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 November 6, 2026, reaching a 72.4°F. While the coldest temperature occurred on October 19, 2021, dipping to 53.4°F. The average readings by season are 65.1°F in Winter, 63.3°F in Spring, 59.8°F in Summer, and 59.2°F in Autumn.
The average temperature in October is slightly warmer than September's average of 58.4°F. And in November, the temperature is expected to rise further, potentially reaching an average of 60.2°F.