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 13.96°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.

57.1

°F

September 4, 11:38

Trend:

stable

Yesterday:

56.5°F

Tomorrow:

57.0°F

Sunrise:

06:46

Sunset:

19:44

Day Length:

12 h. 58 min.

Eureka in September

Minimum:

50.6°F

Average:

52.4°F

Maximum:

54.5°F

Sea water temperature in Eureka today

As of now, in Eureka, the water temperature is 57.1°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 2.1°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 notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 59.2°F on 2019, while the historical minimum was 50.4°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. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 57.4°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
Aug 21	51.3°F	57.4°F	54.6°F
Aug 22	52.6°F	57.4°F	55.0°F
Aug 23	54.0°F	56.7°F	55.0°F
Aug 24	55.9°F	55.0°F	54.8°F
Aug 25	56.8°F	55.4°F	54.6°F
Aug 26	56.2°F	53.4°F	54.6°F
Aug 27	56.7°F	53.9°F	54.7°F
Aug 28	58.1°F	52.1°F	54.9°F
Aug 29	56.4°F	52.6°F	54.8°F
Aug 30	57.3°F	54.7°F	55.3°F
Aug 31	56.7°F	55.5°F	55.3°F
Sep 1	57.1°F	56.3°F	55.2°F
Sep 2	56.8°F	56.5°F	55.4°F
Sep 3	56.5°F	56.6°F	55.3°F
Sep 4	57.1°F	56.4°F	55.1°F
Sep 5	57.0°F	56.2°F	55.0°F
Sep 6	57.5°F	56.1°F	55.4°F
Sep 7	57.3°F	56.8°F	55.3°F
Sep 8	57.8°F	56.5°F	55.7°F
Sep 9	57.4°F	57.5°F	55.4°F
Sep 10	57.7°F	58.3°F	55.6°F
Sep 11	57.5°F	57.5°F	55.4°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, 51.3°F in Spring, 53.6°F in Summer, and 54.2°F in Autumn.