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Looe Bay wave buoy daily means for Sep 2025

Daily means from the Looe Bay wave buoy for Sep 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

1,435 wave-buoy observations covered all 30 days. Typical wave height was 3.3 ft (10th–90th percentile 1.1–5.4 ft), while mean reported wave period; measurement type unavailable was 4.4 seconds (10th–90th percentile 3.5–5.5 seconds). Mean water temperature was 16.2°C (10th–90th percentile 15.3–17.3°C). All 5,740 checked values passed quality control. Across 11 comparable years, mean wave height was above the same-month mean of 2.2 ft and mean wave period was below the same-month mean of 6 seconds.

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

Typical Wave Height

3.3ft
Mean: 3.2 ft
P10–P90: 1.1 — 5.4 ft
Recorded extremes

0.7 — 7.7 ft

Mean Wave Period

4.4secs
P10–P90: 3.5 — 5.5secs
Recorded extremes

2 — 8secs

Wave Direction

SSW

Circular concentration: 90%

Mean Water Temperature

16.2°C
P10–P90: 15.3 — 17.3°C
Recorded extremes

15 — 17.7°C

Compared With Previous Septembers

Historical baseline from 8,697 observations across 11 years.

Wave Height
3.2ft
1ft above mean
Historical mean 2.2ft
Wave Period
4.4s
1.6s below mean
Historical mean 6s
Water Temperature
16.2°C
0.4°C below mean
Historical mean 16.6°C

Chart showing grouped wave observations for Looe Bay. 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 Looe Bay wave buoy

Looe Bay is a Datawell Directional WaveRider station off southeast Cornwall. First deployed in June 2009, it measures the wave climate entering the bay and the approaches to Looe. Observations include wave height, period and direction, sea temperature and calculated wave power; a nearby meteorological station provides separate weather measurements.

Metrics are rows; days run left to right.
Looe Bay wave buoy daily means Sep 2025Last observation shown
Metric
Mean wave height (ft)446524445444456353232211113211
Mean observed period(s)4Reported4Reported5Reported5Reported5Reported4Reported5Reported5Reported4Reported4Reported4Reported4Reported4Reported5Reported5Reported4Reported4Reported4Reported4Reported4Reported5Reported4Reported4Reported4Reported4Reported3Reported4Reported6Reported6Reported5Reported
Mean wave power(kW/m)------------------------------
Mean wave directionSSWconcentration 100%SSWconcentration 98%SSWconcentration 100%SSWconcentration 100%SSWconcentration 100%SSEconcentration 97%Sconcentration 89%SSWconcentration 100%SSWconcentration 99%SSWconcentration 95%SWconcentration 100%SWconcentration 100%SSWconcentration 100%SSWconcentration 97%SWconcentration 100%SSWconcentration 100%SSWconcentration 100%SSWconcentration 100%SSWconcentration 100%SSWconcentration 98%SSWconcentration 95%SEconcentration 87%SSEconcentration 94%SSEconcentration 87%SSWconcentration 94%SSEconcentration 84%Sconcentration 94%SSWconcentration 97%SSWconcentration 100%SSWconcentration 100%
Mean water temperature(°C)17.017.117.217.017.017.217.417.417.317.317.016.516.116.115.915.815.515.715.815.815.615.415.415.415.415.415.315.315.415.4

Swipe sideways to see more days.

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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