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 11.75°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.

53.2

°F

February 25, 10:04

Trend:

stable

Yesterday:

52.9°F

Tomorrow:

53.1°F

Sunrise:

06:57

Sunset:

18:03

Day Length:

11 h. 6 min.

Eureka in March

Minimum:

50.3°F

Average:

52.2°F

Maximum:

54.7°F

Sea water temperature in Eureka today

As of now, in Eureka, the water temperature is 53.2°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 2.7°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

Today's water temperature is slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 53.4°F on 2016, while the historical minimum was 48.3°F on 2022.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 52.1°F, the minimum temperature may reach 51.3°F, and the maximum might stay at 53.1°F.

Daily water temperature in Eureka

Date	Current Year actual* / forecast**	last year	10 years average
Feb 11	53.9°F	49.4°F	51.5°F
Feb 12	53.8°F	49.4°F	51.5°F
Feb 13	54.0°F	49.3°F	51.4°F
Feb 14	54.0°F	49.5°F	51.5°F
Feb 15	53.9°F	49.6°F	51.3°F
Feb 16	54.0°F	49.6°F	51.2°F
Feb 17	53.8°F	49.9°F	51.3°F
Feb 18	53.2°F	50.1°F	51.2°F
Feb 19	53.4°F	50.3°F	51.1°F
Feb 20	53.0°F	50.4°F	51.1°F
Feb 21	52.6°F	50.5°F	51.0°F
Feb 22	52.6°F	50.7°F	51.0°F
Feb 23	52.9°F	50.8°F	51.1°F
Feb 24	52.9°F	50.7°F	50.8°F
Feb 25	53.2°F	50.8°F	50.5°F
Feb 26	53.1°F	51.1°F	50.5°F
Feb 27	53.1°F	51.0°F	50.4°F
Feb 28	52.9°F	51.1°F	50.3°F
Mar 1	51.4°F	51.1°F	50.1°F
Mar 2	51.3°F	51.2°F	50.1°F
Mar 3	51.3°F	51.0°F	50.1°F
Mar 4	51.4°F	51.1°F	50.2°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 52.0°F in Winter, 51.2°F in Spring, 53.7°F in Summer, and 54.2°F in Autumn.