All data are in degrees Fahrenheit

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Water temperature in Saint-Nazaire

Detailed information about the current water temperature in Saint-Nazaire. 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.
Sea temperature in Saint-Nazaire now

67.4

°F

July 27, 15:15

Trend:

decreasing

Yesterday:

68.6°F

Tomorrow:

67.2°F

Sunrise:

06:41

Sunset:

21:49

Day Length:

15 h. 8 min.

Saint-Nazaire in August

Minimum:

46.5°F

Average:

48.6°F

Maximum:

51.2°F

Sea water temperature in Saint-Nazaire today

As of now, in Saint-Nazaire, the water temperature is 67.4°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 0.2°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 fall 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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 70.6°F on 2019, while the historical minimum was 65.2°F on 2017.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest 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 67.3°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Saint-Nazaire

Date Current Year

actual* / forecast**

last year 10 years average
Jul 13 72.0°F 69.5°F 67.2°F
Jul 14 70.9°F 68.9°F 67.2°F
Jul 15 71.9°F 68.7°F 67.4°F
Jul 16 72.1°F 68.1°F 67.2°F
Jul 17 72.4°F 69.1°F 67.6°F
Jul 18 71.1°F 67.5°F 67.9°F
Jul 19 71.5°F 67.3°F 68.1°F
Jul 20 71.1°F 67.0°F 67.6°F
Jul 21 69.1°F 66.5°F 67.5°F
Jul 22 69.2°F 66.5°F 67.6°F
Jul 23 68.6°F 66.3°F 67.4°F
Jul 24 68.3°F 67.1°F 67.7°F
Jul 25 68.7°F 68.1°F 67.8°F
Jul 26 68.6°F 67.5°F 67.6°F
Jul 27 67.4°F 67.3°F 67.5°F
Jul 28 67.2°F 67.4°F 67.3°F
Jul 29 67.2°F 67.9°F 67.3°F
Jul 30 67.1°F 66.8°F 67.3°F
Jul 31 67.6°F 67.0°F 67.7°F
Aug 1 67.6°F 67.5°F 67.7°F
Aug 2 67.5°F 67.1°F 67.6°F
Aug 3 67.4°F 67.0°F 67.6°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 Saint-Nazaire by month

In an average year, Saint-Nazaire offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Saint-Nazaire was recorded on June 26, 2026, reaching a 74.8°F. While the coldest temperature occurred on February 2, 2025, dipping to 44.8°F. The average readings by season are 48.9°F in Winter, 54.7°F in Spring, 66.3°F in Summer, and 60.5°F in Autumn.