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 12.62°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.

54.7

°F

November 2, 05:34

Trend:

decreasing

Yesterday:

54.8°F

Tomorrow:

54.7°F

Sunrise:

06:48

Sunset:

17:12

Day Length:

10 h. 24 min.

Eureka in November

Minimum:

50.8°F

Average:

52.3°F

Maximum:

54.1°F

Sea water temperature in Eureka today

As of now, in Eureka, the water temperature is 54.7°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 1.4°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. 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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 58.4°F on 2016, while the historical minimum was 49.1°F on 2020.

latest data

last year

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 55.1°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
Oct 19	53.6°F	54.8°F	52.9°F
Oct 20	53.0°F	54.6°F	53.0°F
Oct 21	53.5°F	54.8°F	53.2°F
Oct 22	54.4°F	53.9°F	53.2°F
Oct 23	54.7°F	54.8°F	53.4°F
Oct 24	54.4°F	55.0°F	53.4°F
Oct 25	53.9°F	54.7°F	53.4°F
Oct 26	53.5°F	53.9°F	53.4°F
Oct 27	54.2°F	54.3°F	53.6°F
Oct 28	54.9°F	54.4°F	53.5°F
Oct 29	54.8°F	54.2°F	53.3°F
Oct 30	54.9°F	54.9°F	53.5°F
Oct 31	54.8°F	54.4°F	53.4°F
Nov 1	54.8°F	54.6°F	53.4°F
Nov 2	54.7°F	54.1°F	53.3°F
Nov 3	54.7°F	54.2°F	53.2°F
Nov 4	54.7°F	53.6°F	53.2°F
Nov 5	55.1°F	55.4°F	53.7°F
Nov 6	55.2°F	56.1°F	53.7°F
Nov 7	55.2°F	56.9°F	53.8°F
Nov 8	55.1°F	56.6°F	53.7°F
Nov 9	55.5°F	55.8°F	54.1°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, 53.6°F in Summer, and 54.2°F in Autumn.