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Saint-Jean-de-Luz wave buoy daily means for Aug 2025

Daily means from the Saint-Jean-de-Luz wave buoy for Aug 2025, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

1,488 wave-buoy observations covered all 31 days. Typical wave height was 2.7 ft (10th–90th percentile 1.8–8.6 ft), while mean peak wave period was 9.4 seconds (10th–90th percentile 4.9–12.9 seconds). Typical calculated wave power was approximately 2.4 kW/m (10th–90th percentile 0.8–38.6 kW/m), derived from significant wave height and energy period. 11 of 4,464 checked values (0.2%) were excluded by quality control. Across 12 comparable years, mean wave height was above the same-month mean of 3.5 ft and mean wave period was above the same-month mean of 8.9 seconds.

Generated only from the observations and comparisons shown on this page.

Typical Significant Wave Height

2.7ft
Mean: 3.9 ft
P10–P90: 1.8 — 8.6 ft
Recorded extremes

1.2 — 15.2 ft

Mean Observed Wave Period

9.4secs
P10–P90: 4.9 — 12.9secs
Recorded extremes

3 — 22.9secs

Available for 742 of 744 hourly samples

Typical Wave Power

Approximately 2.41kW/m
Mean: 10.6kW/m
P10–P90: 0.75 — 38.55kW/m
Recorded extremes

0.38 — 118.88kW/m

Calculated from significant wave height and energy period.

Typical Observed Wind

-, -mph
Mean: - mph
P10–P90: - — - mph

Available for 0 of 744 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 744 hourly samples

Compared With Previous Augusts

Historical baseline from 16,692 observations across 12 years.

Wave Height
3.9ft
0.4ft above mean
Historical mean 3.478ft
Wave Period
9.4s
0.5s above mean
Historical mean 8.9s
Water Temperature
–
Not enough comparable data

Chart showing grouped wave observations for Saint-Jean-de-Luz. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About Saint-Jean-de-Luz wave buoy

Saint-Jean-de-Luz is a CANDHIS directional buoy on the French Basque coast near the Spanish border. Maintained through the Cerema-coordinated national observatory and local partners, it provides offshore context for a naturally embayed and partly protected coast exposed to southern Bay of Biscay swell.

Its current data source reports wave height, wave period, wave direction, directional spread and sea temperature.

Metrics are rows; days run left to right.
Saint-Jean-de-Luz wave buoy daily means Aug 2025Last observation shown
Metric
Mean significant wave height (ft)23323QC rejected533543322322235322281091186
Mean maximum wave height (ft)3443487447645434333574333121513161310
Mean peak period (s)887591111910111112109778456789710181513121111
Mean average period (s)666579108810997766655566757161411111010
Mean period Tm02 (s)455457866777555554445554511118888
Mean peak wave directionNWconcentration 100%NWconcentration 100%NWconcentration 99%NNWconcentration 97%NNWconcentration 96%NWconcentration 100%NWconcentration 100%NWconcentration 100%NWconcentration 100%NWconcentration 100%NWconcentration 100%WNWconcentration 99%NWconcentration 99%NWconcentration 100%NWconcentration 100%WNWconcentration 97%NWconcentration 100%NWconcentration 99%NNWconcentration 100%NWconcentration 93%NWconcentration 100%NWconcentration 98%NWconcentration 94%NNWconcentration 88%NWconcentration 92%WNWconcentration 100%NWconcentration 100%NWconcentration 100%NWconcentration 100%NWconcentration 100%NWconcentration 100%
Mean directional spread (°)25.323.722.228.522.922.222.723.323.823.624.227.327.225.825.224.827.328.626.926.323.228.027.727.929.330.228.627.425.524.723.7
Mean water temperature(°C)-------------------------------

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Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

The observation data displayed on this page is from the Cerema CANDHIS coastal wave observatory.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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