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

58.5

°F

October 24, 15:00

Trend:

decreasing

Yesterday:

59.3°F

Tomorrow:

58.5°F

Sunrise:

08:40

Sunset:

19:06

Day Length:

10 h. 26 min.

Saint-Nazaire in October

Minimum:

45.9°F

Average:

48.6°F

Maximum:

51.4°F

Sea water temperature in Saint-Nazaire today

As of now, in Saint-Nazaire, the water temperature is 58.5°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 1.3°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 stay about the same.

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 62.1°F on 2022, while the historical minimum was 58.0°F on 2020.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 58.0°F, the minimum temperature may reach 57.8°F, and the maximum might stay at 58.5°F.

Daily water temperature in Saint-Nazaire

Date Current Year

actual* / forecast**

last year 10 years average
Oct 10 63.3°F 62.3°F 61.8°F
Oct 11 62.6°F 62.3°F 61.6°F
Oct 12 62.7°F 61.5°F 61.4°F
Oct 13 60.9°F 62.2°F 61.5°F
Oct 14 62.2°F 61.6°F 61.3°F
Oct 15 63.1°F 61.5°F 61.3°F
Oct 16 63.1°F 61.3°F 61.4°F
Oct 17 62.0°F 61.3°F 61.1°F
Oct 18 61.3°F 61.2°F 60.9°F
Oct 19 59.9°F 60.6°F 60.7°F
Oct 20 59.6°F 60.4°F 60.5°F
Oct 21 60.0°F 60.2°F 60.4°F
Oct 22 59.6°F 60.1°F 60.1°F
Oct 23 59.3°F 59.6°F 59.9°F
Oct 24 58.5°F 59.6°F 59.9°F
Oct 25 58.5°F 59.3°F 59.8°F
Oct 26 58.2°F 59.1°F 59.6°F
Oct 27 58.2°F 58.9°F 59.5°F
Oct 28 58.0°F 58.8°F 59.3°F
Oct 29 57.9°F 58.7°F 59.2°F
Oct 30 57.8°F 57.8°F 59.1°F
Oct 31 57.8°F 57.6°F 59.1°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 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, 66.4°F in Summer, and 60.6°F in Autumn.