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

71.5

°F

July 7, 11:55

Trend:

increasing

Yesterday:

70.7°F

Tomorrow:

71.8°F

Sunrise:

06:20

Sunset:

22:07

Day Length:

15 h. 47 min.

Saint-Nazaire in July

Minimum:

46.4°F

Average:

48.5°F

Maximum:

51.1°F

Sea water temperature in Saint-Nazaire today

As of now, in Saint-Nazaire, the water temperature is 71.5°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 5.3°F higher 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 rise a bit.

Recent sea temperature and forecast

Today's reading indicates a minor change compared to the average water temperature of the last two weeks, but the overall trend remains steady. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 67.7°F on 2018, while the historical minimum was 64.2°F on 2016.

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. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 72.0°F, with minimum temperature starting at 71.7°F, while the maximum might reach 72.2°F.

Daily water temperature in Saint-Nazaire

Date Current Year

actual* / forecast**

last year 10 years average
Jun 23 72.7°F 68.1°F 66.1°F
Jun 24 73.6°F 68.1°F 66.3°F
Jun 25 74.5°F 67.6°F 66.5°F
Jun 26 74.8°F 68.1°F 66.6°F
Jun 27 72.4°F 69.1°F 66.6°F
Jun 28 71.4°F 69.6°F 66.5°F
Jun 29 70.3°F 70.4°F 66.6°F
Jun 30 70.6°F 70.7°F 66.5°F
Jul 1 70.7°F 71.9°F 66.6°F
Jul 2 69.9°F 72.1°F 66.5°F
Jul 3 69.5°F 71.3°F 66.3°F
Jul 4 69.7°F 70.1°F 66.5°F
Jul 5 69.8°F 68.4°F 66.5°F
Jul 6 70.7°F 68.1°F 66.4°F
Jul 7 71.5°F 66.7°F 66.2°F
Jul 8 71.8°F 66.3°F 66.5°F
Jul 9 71.7°F 64.9°F 66.4°F
Jul 10 72.0°F 66.5°F 66.7°F
Jul 11 72.1°F 67.0°F 66.8°F
Jul 12 72.0°F 68.7°F 66.7°F
Jul 13 72.1°F 69.5°F 66.7°F
Jul 14 72.2°F 68.9°F 66.8°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 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, 66.2°F in Summer, and 60.5°F in Autumn.