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Porthleven wave buoy daily means for Jul 2026

Daily means from the Porthleven wave buoy for Jul 2026, 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

1,475 wave-buoy observations covered all 31 days. Typical wave height was 1.1 ft (10th–90th percentile 0.6–2.4 ft), while mean reported wave period; measurement type unavailable was 4.4 seconds (10th–90th percentile 3–6 seconds). Mean water temperature was 18°C (10th–90th percentile 15.8–19.5°C). 1 of 5,900 checked values (0%) were excluded by quality control. Across 13 comparable years, mean wave height was below the same-month mean of 2.5 ft and mean wave period was below the same-month mean of 7.4 seconds.

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

Typical Wave Height

1.1ft
Mean: 1.4 ft
P10–P90: 0.6 — 2.4 ft
Recorded extremes

0.4 — 4.7 ft

Mean Wave Period

4.4secs
P10–P90: 3 — 6secs
Recorded extremes

2 — 7secs

Wave Direction

SW

Circular concentration: 75%

Mean Water Temperature

18°C
P10–P90: 15.8 — 19.5°C
Recorded extremes

15 — 21.9°C

Compared With Previous Julys

Historical baseline from 11,532 observations across 13 years.

Wave Height
1.4ft
1.1ft below mean
Historical mean 2.5ft
Wave Period
4.4s
3s below mean
Historical mean 7.4s
Water Temperature
18°C
2.1°C above mean
Historical mean 15.9°C

Chart showing grouped wave observations for Porthleven. 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 Porthleven wave buoy

Porthleven is a Datawell Directional WaveRider station off Cornwall's exposed south coast. First deployed by the National Network in October 2011, it measures waves approaching the Porthleven frontage from the western English Channel. Observations include wave height, period and direction, sea temperature and calculated wave power.

Metrics are rows; days run left to right.
Porthleven wave buoy daily means Jul 2026Last observation shown
Metric
Mean wave height (ft)4322211111122221111111111321111
Mean observed period(s)5Reported5Reported5Reported4Reported4Reported6Reported6Reported6Reported6Reported6Reported5Reported3Reported4Reported4Reported4Reported5Reported6Reported4Reported4Reported4Reported4Reported4Reported4Reported4Reported3Reported4Reported4Reported4Reported4Reported4Reported4Reported
Mean wave power(kW/m)-------------------------------
Mean wave directionWSWconcentration 100%WSWconcentration 100%WSWconcentration 100%WSWconcentration 100%WSWconcentration 100%SSWconcentration 91%SSWconcentration 75%SSWconcentration 78%SWconcentration 89%SWconcentration 81%SWconcentration 91%SEconcentration 84%Sconcentration 85%Sconcentration 85%Sconcentration 78%SSWconcentration 77%SSWconcentration 91%Sconcentration 82%SWconcentration 84%SSEconcentration 66%SSEconcentration 65%SSWconcentration 71%Sconcentration 61%SSWconcentration 88%SWconcentration 73%WSWconcentration 100%WSWconcentration 100%SWconcentration 99%WSWconcentration 98%WSWconcentration 98%WSWconcentration 98%
Mean water temperature(°C)16.915.915.916.015.816.516.816.016.617.218.217.818.418.618.618.919.818.918.518.919.018.719.320.419.718.918.418.919.218.717.7

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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.

Which wave period is shown?

The table shows the best period measurement supplied for each observation. It is not necessarily the energy period used to calculate wave power.

Tp
Peak period: the period at the strongest spectral peak.
Tavg
The provider's average wave period.
Tm02
A mean period calculated from the wave spectrum.
Tz
Mean zero-crossing period.
Reported
A legacy value whose period type was not recorded.
Mixed
A daily or monthly mean containing more than one period type.

Wave power needs a genuine energy period (Te). SurfHog does not substitute Tp, Tavg, Tm02 or Tz when Te is missing.

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 Regional Coastal Monitoring Programme.

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