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Seaford wave buoy daily means for Jul 2021

Daily means from the Seaford wave buoy for Jul 2021, 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

741 wave-buoy observations covered all 31 days. Typical wave height was 1 ft (10th–90th percentile 0.4–4.1 ft), while the reported wave period averaged 3.5 seconds (10th–90th percentile 3–4 seconds). Typical wind was 0 mph and mean water temperature was 17.7°C (10th–90th percentile 16.6–18.9°C). All 3,705 checked values passed quality control. Across 7 comparable years, mean wave height was below the same-month mean of 2 ft and mean wave period was below the same-month mean of 5.3 seconds.

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

Typical Significant Wave Height

1ft
Mean: 1.8 ft
P10–P90: 0.4 — 4.1 ft
Recorded extremes

0.3 — 11.7 ft

Mean Observed Wave Period

3.5secs
P10–P90: 3 — 4secs
Recorded extremes

2 — 6secs

Observed Wave Direction

SW

Circular concentration: 83%

Mean Water Temperature

17.7°C
P10–P90: 16.6 — 18.9°C
Recorded extremes

15.6 — 20.2°C

Compared With Previous Julys

Historical baseline from 4,931 observations across 7 years.

Wave Height
1.8ft
0.2ft below mean
Historical mean 2ft
Wave Period
3.5s
1.8s below mean
Historical mean 5.3s
Water Temperature
17.7°C
0.8°C below mean
Historical mean 18.5°C

Chart showing grouped wave observations for Seaford. 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 Seaford wave buoy

Seaford is a National Network Datawell Directional WaveRider in about 11 metres of water off East Sussex. First deployed on 22 January 2008, it records waves reaching Seaford Bay between Newhaven and Beachy Head and supports assessment of the town's exposed shingle frontage.

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

Metrics are rows; days run left to right.
Seaford wave buoy daily means Jul 2021Last observation shown
Metric
Mean significant wave height (ft)11123QC rejected3221111111110001111126574
Mean maximum wave height (ft)-------------------------------
Mean peak period (s)-------------------------------
Mean zero-crossing period (s)-------------------------------
Mean energy period (s)-------------------------------
Mean reported period (s)3333454333444444333333333334454
Mean wave power, kilowatts per metre-------------------------------
Mean peak wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean reported wave directionSSWconcentration 92%SWconcentration 95%SSWconcentration 79%WSWconcentration 99%SWconcentration 82%SWconcentration 94%SWconcentration 99%WSWconcentration 99%WSWconcentration 97%SWconcentration 73%WSWconcentration 99%SWconcentration 72%SWconcentration 84%WSWconcentration 97%SWconcentration 92%WSWconcentration 91%SSWconcentration 79%SSWconcentration 82%SSWconcentration 89%SWconcentration 85%SSWconcentration 89%SSEconcentration 86%SSEconcentration 82%SSEconcentration 75%SWconcentration 89%SWconcentration 95%WSWconcentration 97%SWconcentration 100%WSWconcentration 100%SWconcentration 93%SWconcentration 100%
Mean water temperature(°C)16.316.416.416.617.017.117.517.417.417.317.217.117.117.017.017.217.518.318.418.518.618.318.318.418.418.518.518.719.018.919.0

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.

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.

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

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