What is the current water temperature in Saint-Nazaire?

Q: What is the current water temperature in Saint-Nazaire?

As of now, in Saint-Nazaire, the water temperature is 20.32°C. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool.

France > Saint-Nazaire

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.

68.6

°F

September 10, 07:01

Trend:

decreasing

Yesterday:

68.8°F

Tomorrow:

68.3°F

Sunrise:

07:39

Sunset:

20:32

Day Length:

12 h. 53 min.

Saint-Nazaire in September

Minimum:

46.5°F

Average:

48.6°F

Maximum:

51.3°F

Sea water temperature in Saint-Nazaire today

As of now, in Saint-Nazaire, the water temperature is 68.6°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 2.9°F higher 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

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 68.5°F on 2023, while the historical minimum was 63.6°F on 2024.

latest data

last year

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 maximum recorded over the past years. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 68.1°F, the minimum temperature may reach 67.7°F, and the maximum might stay at 68.3°F.

Daily water temperature in Saint-Nazaire

Date	Current Year actual* / forecast**	last year	10 years average
Aug 27	67.7°F	68.3°F	66.9°F
Aug 28	67.3°F	67.6°F	66.8°F
Aug 29	67.5°F	67.7°F	66.8°F
Aug 30	66.8°F	67.8°F	66.7°F
Aug 31	67.2°F	67.0°F	66.2°F
Sep 1	67.4°F	67.8°F	66.3°F
Sep 2	67.7°F	67.7°F	66.3°F
Sep 3	68.5°F	67.3°F	66.3°F
Sep 4	68.9°F	67.2°F	66.7°F
Sep 5	68.8°F	66.0°F	66.3°F
Sep 6	68.7°F	66.0°F	66.4°F
Sep 7	69.4°F	66.3°F	66.4°F
Sep 8	69.6°F	66.5°F	66.2°F
Sep 9	68.8°F	65.9°F	65.9°F
Sep 10	68.6°F	66.9°F	65.6°F
Sep 11	68.3°F	66.0°F	65.4°F
Sep 12	68.3°F	65.6°F	65.3°F
Sep 13	68.2°F	65.0°F	65.3°F
Sep 14	68.1°F	64.8°F	65.2°F
Sep 15	68.0°F	65.1°F	65.0°F
Sep 16	68.0°F	64.8°F	65.1°F
Sep 17	67.7°F	64.7°F	64.8°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, 66.4°F in Summer, and 60.5°F in Autumn.