San Diego in January
Find out everything about the water temperature in San Diego 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:
55.5 °F
Average:
59.1 °F
Maximum:
62.8 °F
Sea water temperature in San Diego in January
In the city of San Diego, the month of January is too cold for swimming. The minimum recorded temperature during this month was 55.5°F on January 15, 2025, with an average temperature being 59.1°F and a maximum temperature reaching 62.8°F on January 6, 2026.
| Date | 10 years average | 2026 | 2025 |
|---|---|---|---|
| Jan 1 | 59.7°F | 62.6°F | 56.2°F |
| Jan 2 | 59.7°F | 62.3°F | 56.0°F |
| Jan 3 | 59.5°F | 62.3°F | 55.7°F |
| Jan 4 | 59.6°F | 62.3°F | 56.2°F |
| Jan 5 | 59.6°F | 62.5°F | 56.2°F |
| Jan 6 | 59.6°F | 62.8°F | 56.2°F |
| Jan 7 | 59.5°F | 62.5°F | 56.0°F |
| Jan 8 | 59.5°F | 62.5°F | 56.6°F |
| Jan 9 | 59.5°F | 62.2°F | 56.4°F |
| Jan 10 | 59.5°F | 62.0°F | 56.8°F |
| Jan 11 | 59.2°F | 61.4°F | 57.0°F |
| Jan 12 | 59.2°F | 61.4°F | 56.5°F |
| Jan 13 | 58.9°F | 61.1°F | 55.9°F |
| Jan 14 | 58.8°F | 61.0°F | 55.5°F |
| Jan 15 | 58.8°F | 61.0°F | 55.5°F |
| Jan 16 | 58.7°F | 60.9°F | 55.6°F |
| Jan 17 | 58.8°F | 60.9°F | 55.7°F |
| Jan 18 | 59.0°F | 61.2°F | 55.8°F |
| Jan 19 | 59.0°F | 61.2°F | 55.9°F |
| Jan 20 | 59.0°F | 61.2°F | 55.8°F |
| Jan 21 | 58.9°F | 61.1°F | 55.9°F |
| Jan 22 | 59.1°F | 61.2°F | 55.8°F |
| Jan 23 | 58.9°F | 61.1°F | 55.5°F |
| Jan 24 | 59.0°F | 61.1°F | 55.8°F |
| Jan 25 | 58.7°F | 60.9°F | 55.5°F |
| Jan 26 | 58.9°F | 61.0°F | 55.8°F |
| Jan 27 | 58.8°F | 61.0°F | 56.1°F |
| Jan 28 | 58.7°F | 60.9°F | 56.4°F |
| Jan 29 | 58.7°F | 60.9°F | 55.9°F |
| Jan 30 | 58.8°F | 61.0°F | 56.4°F |
| Jan 31 | 58.9°F | 61.1°F | 56.7°F |
In an average year, San Diego offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in San Diego was recorded on August 7, 2018, reaching a 75.8°F. While the coldest temperature occurred on January 15, 2025, dipping to 55.5°F. The average readings by season are 59.5°F in Winter, 61.4°F in Spring, 68.2°F in Summer, and 65.9°F in Autumn.
While January's temperature is lower than December's average of 60.4°F, as February takes over, the temperature remains steady at 59.1°F.
Popular neighboring cities and resorts
| City | Water temperature* | Distance** |
|---|---|---|
| Tijuana |
61.4°F
|
17mi |
| Oceanside |
62.0°F
|
35mi |
| Laguna Beach |
61.2°F
|
67mi |
* current water temperature in this city
** straight line distance from San Diego