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 13.78°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.

56.8

°F

July 26, 01:25

Trend:

stable

Yesterday:

55.2°F

Tomorrow:

56.3°F

Sunrise:

06:07

Sunset:

20:38

Day Length:

14 h. 31 min.

Eureka in August

Minimum:

50.2°F

Average:

52.3°F

Maximum:

54.4°F

Sea water temperature in Eureka today

As of now, in Eureka, the water temperature is 56.8°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 2.7°F higher 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 fall a bit.

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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 55.4°F on 2023, while the historical minimum was 53.2°F on 2022.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 56.5°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
Jul 12	53.0°F	52.3°F	53.7°F
Jul 13	53.6°F	51.3°F	53.5°F
Jul 14	53.3°F	51.6°F	53.1°F
Jul 15	53.0°F	52.6°F	53.3°F
Jul 16	53.5°F	52.5°F	53.2°F
Jul 17	53.4°F	51.5°F	53.1°F
Jul 18	53.6°F	51.9°F	53.4°F
Jul 19	53.8°F	49.5°F	53.4°F
Jul 20	54.2°F	48.7°F	53.2°F
Jul 21	53.8°F	50.7°F	53.1°F
Jul 22	55.1°F	52.5°F	53.7°F
Jul 23	54.7°F	53.3°F	54.2°F
Jul 24	53.3°F	53.5°F	54.3°F
Jul 25	55.2°F	54.3°F	54.3°F
Jul 26	56.8°F	54.4°F	54.1°F
Jul 27	56.3°F	54.9°F	53.6°F
Jul 28	56.3°F	55.0°F	53.7°F
Jul 29	56.4°F	55.2°F	53.7°F
Jul 30	56.5°F	55.1°F	53.8°F
Jul 31	56.4°F	54.2°F	53.7°F
Aug 1	56.7°F	54.2°F	54.0°F
Aug 2	57.2°F	54.8°F	54.5°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.