Saint-Cast-le-Guildo Sea Temperature

(Today) 2025

8.8°C / 47.9°F

The water will feel cold. All but the most ardent watersports enthusiasts will be thinking of packing up for the winter. If not we'd suggest a thick 5/4mm wetsuit along with some boots and a hood.

Current weather

11°C / 51°F
(overcast clouds)
Partly cloudy
Wind
13 mph
Humidity
86%

The measurements for the water temperature in Saint-Cast-le-Guildo, Brittany are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.

*Live data may vary from satellite readings for a number of reasons. These include local factors, depth of smapling and time of day.

Water temp by month

Monthly average max / min water temperatures

The graph below shows the range of monthly Saint-Cast-le-Guildo water temperature derived from many years of historical sea surface temperature data.

Saint-Cast-le-Guildo average maximum / minimum water temperatures
Maximum and minimum monthly sea temperatures in Saint-Cast-le-Guildo
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 7.6 8 7.7 9.2 11.5 12.9 15 16.6 16.8 15.3 13.2 10.3
Max °C 11.2 10.1 10.3 12.1 14 16.7 17.9 19 19.1 17.9 16.5 14
Min °F 47.1 47.2 46.9 49.7 53.7 56.7 60.1 62.8 63.1 60.6 57 52
Max °F 50.7 49.3 49.5 52.6 56.2 60.5 63 65.2 65.4 63.2 60.3 55.7

The warmest water temperature is in September with an average around 64.2°F / 17.9°C. The coldest month is February with an average water temperature of 48.2°F / 9.0°C.

7 day tide forecast for Saint-Cast-le-Guildo

SunMonTueWedThuFriSat
  • High 01:16am
    (9.24m)
  • Low 08:36am
    (4.44m)
  • High 02:36pm
    (9.32m)
  • Low 09:34pm
    (4.41m)
  • High 03:06am
    (9.75m)
  • Low 10:19am
    (3.74m)
  • High 03:45pm
    (10m)
  • Low 10:42pm
    (3.63m)
  • High 04:04am
    (10.5m)
  • Low 11:13am
    (2.9m)
  • High 04:32pm
    (10.71m)
  • Low 11:30pm
    (2.85m)
  • High 04:45am
    (11.18m)
  • Low 11:56am
    (2.23m)
  • High 05:10pm
    (11.29m)
  • Low 12:11am
    (2.26m)
  • High 05:22am
    (11.67m)
  • Low 12:32pm
    (1.79m)
  • High 05:43pm
    (11.67m)
  • Low 12:45am
    (1.88m)
  • High 05:55am
    (11.98m)
  • Low 01:04pm
    (1.59m)
  • High 06:15pm
    (11.91m)
  • Low 01:15am
    (1.7m)
  • High 06:27am
    (12.1m)
  • Low 01:33pm
    (1.56m)
  • High 06:44pm
    (11.99m)
7 day tide times for Saint-Cast-le-Guildo

*These tide times are estimates based on the nearest accurate location (Saint Servan, France) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.