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 10.31°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.

50.6

°F

May 26, 11:55

Trend:

stable

Yesterday:

49.6°F

Tomorrow:

50.5°F

Sunrise:

05:51

Sunset:

20:37

Day Length:

14 h. 46 min.

Eureka in June

Minimum:

50.3°F

Average:

52.2°F

Maximum:

54.4°F

Sea water temperature in Eureka today

As of now, in Eureka, the water temperature is 50.6°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 1.0°F lower than the average recorded on this particular day in recent years. Since yesterday, there was a noticeable 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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 54.5°F on 2016, while the historical minimum was 49.3°F on 2024.

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 histoorical minimum and others when it was close to the historical maximum. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 50.7°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
May 12	52.8°F	49.3°F	51.7°F
May 13	53.8°F	49.9°F	51.5°F
May 14	54.2°F	50.5°F	51.8°F
May 15	53.8°F	50.7°F	51.9°F
May 16	52.9°F	50.4°F	51.9°F
May 17	51.5°F	50.6°F	52.1°F
May 18	50.1°F	50.8°F	51.9°F
May 19	49.1°F	50.3°F	51.6°F
May 20	49.8°F	49.2°F	51.5°F
May 21	50.3°F	50.0°F	51.3°F
May 22	50.3°F	50.6°F	51.0°F
May 23	49.8°F	50.6°F	51.0°F
May 24	48.6°F	50.6°F	50.8°F
May 25	49.6°F	50.7°F	51.3°F
May 26	50.6°F	51.7°F	51.5°F
May 27	50.5°F	51.6°F	51.5°F
May 28	50.5°F	51.6°F	51.4°F
May 29	50.8°F	52.5°F	51.7°F
May 30	50.7°F	52.8°F	51.7°F
May 31	50.5°F	51.7°F	51.4°F
Jun 1	50.7°F	52.8°F	51.7°F
Jun 2	51.2°F	53.1°F	52.1°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, 53.7°F in Summer, and 54.2°F in Autumn.