Eureka in January
Find out everything about the water temperature in Eureka 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:
48.4 °F
Average:
52.1 °F
Maximum:
54.9 °F
Sea water temperature in Eureka in January
In the city of Eureka, the month of January is too cold for swimming. The minimum recorded temperature during this month was 48.4°F on January 28, 2025, with an average temperature being 52.1°F and a maximum temperature reaching 54.9°F on January 2, 2024.
| Date | 10 years average | 2026 | 2025 |
|---|---|---|---|
| Jan 1 | 52.1°F | 52.0°F | 53.2°F |
| Jan 2 | 52.3°F | 52.5°F | 53.7°F |
| Jan 3 | 52.2°F | 52.7°F | 53.6°F |
| Jan 4 | 52.2°F | 53.4°F | 53.7°F |
| Jan 5 | 52.1°F | 53.6°F | 53.5°F |
| Jan 6 | 52.2°F | 53.8°F | 53.4°F |
| Jan 7 | 52.3°F | 53.5°F | 53.2°F |
| Jan 8 | 52.3°F | 53.8°F | 53.4°F |
| Jan 9 | 52.4°F | 53.7°F | 53.3°F |
| Jan 10 | 52.3°F | 53.2°F | 53.0°F |
| Jan 11 | 52.3°F | 53.4°F | 53.2°F |
| Jan 12 | 52.2°F | 53.4°F | 52.3°F |
| Jan 13 | 52.1°F | 52.9°F | 50.9°F |
| Jan 14 | 52.1°F | 52.7°F | 49.6°F |
| Jan 15 | 52.2°F | 52.7°F | 50.2°F |
| Jan 16 | 52.2°F | 52.6°F | 50.4°F |
| Jan 17 | 52.3°F | 52.7°F | 50.7°F |
| Jan 18 | 52.2°F | 52.7°F | 50.8°F |
| Jan 19 | 52.2°F | 52.6°F | 50.3°F |
| Jan 20 | 52.1°F | 52.5°F | 50.1°F |
| Jan 21 | 51.9°F | 52.3°F | 49.6°F |
| Jan 22 | 51.9°F | 52.4°F | 49.4°F |
| Jan 23 | 51.9°F | 52.3°F | 49.1°F |
| Jan 24 | 51.8°F | 52.3°F | 49.1°F |
| Jan 25 | 51.9°F | 52.3°F | 49.5°F |
| Jan 26 | 51.9°F | 52.3°F | 49.1°F |
| Jan 27 | 51.7°F | 52.2°F | 48.9°F |
| Jan 28 | 51.7°F | 52.1°F | 48.4°F |
| Jan 29 | 51.7°F | 52.2°F | 48.7°F |
| Jan 30 | 51.7°F | 52.1°F | 49.0°F |
| Jan 31 | 51.7°F | 52.2°F | 49.1°F |
In an average year, Eureka offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Eureka was recorded on August 12, 2022, reaching a 61.8°F. While the coldest temperature occurred on June 7, 2025, dipping to 44.2°F. The average readings by season are 51.9°F in Winter, 51.2°F in Spring, 53.7°F in Summer, and 54.2°F in Autumn.
January's average temperature is a slight drop from December's average of 52.7°F. In February, the temperature is expected to decrease further, potentially averaging around 51.1°F.