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 11.18°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.

52.1

°F

June 15, 15:11

Trend:

stable

Yesterday:

51.9°F

Tomorrow:

51.7°F

Sunrise:

05:45

Sunset:

20:50

Day Length:

15 h. 5 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 52.1°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 1.1°F lower 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 fall a bit.

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 55.0°F on 2021, while the historical minimum was 50.3°F on 2024.

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 51.8°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
Jun 1	50.8°F	52.8°F	51.6°F
Jun 2	51.3°F	53.1°F	52.1°F
Jun 3	51.5°F	50.7°F	52.0°F
Jun 4	52.1°F	48.5°F	52.1°F
Jun 5	51.8°F	48.1°F	51.8°F
Jun 6	52.1°F	46.8°F	51.9°F
Jun 7	51.6°F	44.2°F	51.5°F
Jun 8	50.7°F	46.3°F	51.8°F
Jun 9	50.9°F	47.3°F	51.9°F
Jun 10	52.0°F	46.9°F	52.2°F
Jun 11	51.7°F	46.7°F	52.5°F
Jun 12	52.0°F	47.8°F	52.9°F
Jun 13	51.1°F	49.8°F	53.0°F
Jun 14	51.9°F	51.7°F	53.1°F
Jun 15	52.1°F	52.8°F	53.2°F
Jun 16	51.7°F	51.4°F	52.8°F
Jun 17	51.9°F	51.6°F	53.0°F
Jun 18	52.0°F	52.1°F	53.1°F
Jun 19	52.0°F	51.6°F	53.1°F
Jun 20	51.8°F	51.6°F	52.9°F
Jun 21	51.9°F	52.8°F	53.0°F
Jun 22	51.6°F	52.6°F	52.8°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.