What is the current water temperature in Eureka?

Q: What is the current water temperature in Eureka?

As of now, in Eureka, the water temperature is 12.12°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

United States > Eureka

Water temperature in Eureka

Detailed information about the current water temperature in Eureka. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.

53.8

°F

December 25, 16:51

Trend:

stable

Yesterday:

53.5°F

Tomorrow:

53.8°F

Sunrise:

07:39

Sunset:

16:54

Day Length:

9 h. 15 min.

Eureka in January

Minimum:

50.4°F

Average:

52.5°F

Maximum:

56.2°F

Sea water temperature in Eureka today

As of now, in Eureka, the water temperature is 53.8°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 1.3°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 54.9°F on 2023, while the historical minimum was 50.3°F on 2020.

latest data

last year

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 53.7°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Eureka

Date	Current Year actual* / forecast**	last year	10 years average
Jan 1	53.8°F	53.2°F	52.5°F
Dec 11	52.6°F	52.8°F	53.0°F
Dec 12	51.2°F	52.7°F	52.9°F
Dec 13	52.3°F	52.6°F	53.0°F
Dec 14	52.9°F	52.2°F	53.0°F
Dec 15	52.7°F	52.0°F	53.0°F
Dec 16	53.1°F	51.9°F	53.0°F
Dec 17	54.1°F	52.3°F	53.0°F
Dec 18	54.8°F	52.0°F	52.7°F
Dec 19	55.0°F	52.4°F	52.7°F
Dec 20	55.3°F	52.6°F	52.6°F
Dec 21	54.5°F	52.6°F	52.8°F
Dec 22	54.7°F	52.9°F	52.8°F
Dec 23	54.3°F	52.8°F	52.7°F
Dec 24	53.5°F	53.2°F	52.7°F
Dec 25	53.8°F	53.6°F	52.6°F
Dec 26	53.8°F	53.6°F	52.6°F
Dec 27	53.7°F	53.5°F	52.4°F
Dec 28	53.7°F	53.5°F	52.4°F
Dec 29	53.7°F	53.7°F	52.4°F
Dec 30	53.7°F	53.9°F	52.4°F
Dec 31	53.5°F	53.7°F	52.3°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Eureka by month

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 52.1°F in Winter, 51.3°F in Spring, 53.9°F in Summer, and 54.3°F in Autumn.