Finistère, France
Celtic Sea48.53°N, 4.76°WStation FR-FIN-GWE

Gwen Trez Sea Water Temperature

A temperate beach on the Celtic Sea, warmest around August at about 15.7°C. Today's reading, 7-day forecast, and monthly averages below.

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Water Temperature NowBuoy & Sentinel-3 SST

Gwen Trez water temperature

15
59°FVery Cold (< 16°C)

Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges.

+0°vs Sep avgCeltic Sea48.53°N, 4.76°W
Activity Index:SwimmingSnorkelingSurfingTypical conditions
Marine Atmosphere Grid Live Marine Feed
Coastal Air
17°C
61.7°F onshore
Wind Speed
12 km/h
Surface wind
Wave Height
0.8 m
Slight shore chop
Swell
0.6 m
Deep water swell
Wave Period
6 s
Peak interval
UV Index
—
Daily maximum
Sunrise
—
First morning light
Sunset
—
Golden hour close

7-Day Water Temperature Forecast

Open-Meteo ocean model
Today
WedSep 30
15°C
59°F
Waves: 1m
Very Cold
ThuOct 1
15.3°C
59.5°F
Waves: 0.9m
Very Cold
FriOct 2
15.4°C
59.7°F
Waves: 0.7m
Very Cold
SatOct 3
15.3°C
59.5°F
Waves: 0.6m
Very Cold
SunOct 4
15°C
59°F
Waves: 0.7m
Very Cold
MonOct 5
14.7°C
58.5°F
Waves: 0.9m
Very Cold
TueOct 6
14.6°C
58.3°F
Waves: 1m
Very Cold
Forecast cooling trend: -0.4°C over 7 days at Gwen Trez.
Confidence: High

Gwen Trez Monthly Water Temperature Averages

Historical monthly climatology. The warmest water in Gwen Trez occurs inJuly, August, September, October — peaking at15.7°C (60.3°F) in August.

Year-Round Water Temperature Curve (°C / °F)

Hover a bar for details
Current month Comfortable (20–24°C) Warm (24°C+) Cool (<20°C)
11
Jan
11
Feb
11
Mar
11
Apr
12
May
14
Jun
15
Jul
16
Aug
Current
15
Sep
14
Oct
14
Nov
12
Dec
Full 12-month data table — min / avg / max & swimming comfort
MonthMin Water TempAverage Water TempMax Water TempSwimming Comfort
January10.3°C11.3°C12.6°CVery Cold (< 16°C)
February9.3°C10.7°C11.5°CVery Cold (< 16°C)
March9.3°C10.5°C11.7°CVery Cold (< 16°C)
April9.9°C11°C12.3°CVery Cold (< 16°C)
May11°C12.3°C13.8°CVery Cold (< 16°C)
June12.5°C13.9°C15.3°CVery Cold (< 16°C)
July13.2°C15.2°C17.7°CVery Cold (< 16°C)
August14°C15.7°C17.5°CVery Cold (< 16°C)
SeptemberCurrent13.4°C15°C16.7°CVery Cold (< 16°C)
October13.3°C14.3°C16.4°CVery Cold (< 16°C)
November11.9°C13.5°C14.8°CVery Cold (< 16°C)
December11.3°C12.4°C13.8°CVery Cold (< 16°C)

Swimming FAQs for Gwen Trez

Is the sea warm enough to swim in Gwen Trez today?

Typical sea surface temperature in Gwen Trez this time of year is 15°C (59°F) — classified as Very Cold (< 16°C). Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges. Live readings load automatically.

What are the warmest months for swimming in Gwen Trez?

The highest water temperatures in Gwen Trez typically occur duringJuly, August, September, October, when monthly averages reach peak seasonal levels.

What is the typical water temperature in Gwen Trez in September?

Historically in September, water temperatures in Gwen Trez average around15°C (59.0°F), fluctuating between a recorded minimum of 13.4°C and a maximum of 16.7°C.

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Gwen Trez Coastal Zone Map

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