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 8.18°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.

46.7

°F

June 11, 03:53

Trend:

stable

Yesterday:

46.9°F

Tomorrow:

47.0°F

Sunrise:

05:45

Sunset:

20:48

Day Length:

15 h. 3 min.

Eureka in June

Minimum:

50.3°F

Average:

52.3°F

Maximum:

55.1°F

Sea water temperature in Eureka today

As of now, in Eureka, the water temperature is 46.7°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 6.5°F lower 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 rise a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 54.6°F on 2016, while the historical minimum was 51.5°F on 2024.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest 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 46.8°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
May 28	51.6°F	48.9°F	51.4°F
May 29	52.5°F	49.9°F	51.7°F
May 30	52.8°F	49.5°F	51.7°F
May 31	51.7°F	48.6°F	51.4°F
Jun 1	52.8°F	47.8°F	51.7°F
Jun 2	53.1°F	49.0°F	52.1°F
Jun 3	50.7°F	50.3°F	52.1°F
Jun 4	48.5°F	50.6°F	52.1°F
Jun 5	48.1°F	52.2°F	51.9°F
Jun 6	46.8°F	52.6°F	51.9°F
Jun 7	44.2°F	51.2°F	51.7°F
Jun 8	46.3°F	51.9°F	52.0°F
Jun 9	47.3°F	52.3°F	52.1°F
Jun 10	46.9°F	51.5°F	52.3°F
Jun 11	46.7°F	51.5°F	53.2°F
Jun 12	47.0°F	52.1°F	53.5°F
Jun 13	47.1°F	51.7°F	53.6°F
Jun 14	47.0°F	49.9°F	53.5°F
Jun 15	46.8°F	50.3°F	53.3°F
Jun 16	46.5°F	50.9°F	52.9°F
Jun 17	46.6°F	50.0°F	53.0°F
Jun 18	46.7°F	50.9°F	53.1°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 52.1°F in Winter, 51.3°F in Spring, 54.0°F in Summer, and 54.2°F in Autumn.