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Lowestoft wave buoy daily means for Sep 2023

Daily means from the Lowestoft wave buoy for Sep 2023, 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

1,413 wave-buoy observations covered all 30 days. Typical wave height was 1.5 ft (10th–90th percentile 0.8–4.9 ft), while mean average of more than one wave period type was 5.2 seconds (10th–90th percentile 3.4–6.9 seconds). Mean water temperature was 18.7°C (10th–90th percentile 18–19.4°C). 13 of 5,569 checked values (0.2%) were excluded by quality control. Across 7 comparable years, mean wave height was below the same-month mean of 2.4 ft and mean wave period was below the same-month mean of 5.4 seconds.

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

Typical Significant Wave Height

1.5ft
Mean: 2.1 ft
P10–P90: 0.8 — 4.9 ft
Recorded extremes

0.4 — 8.8 ft

Available for 700 of 712 hourly samples

Mean Observed Wave Period

5.2secs
P10–P90: 3.4 — 6.9secs
Recorded extremes

1.8 — 16.7secs

Available for 697 of 712 hourly samples

Observed Wave Direction

ESE

Circular concentration: 56%

Mean Water Temperature

18.7°C
P10–P90: 18 — 19.4°C
Recorded extremes

17.4 — 22.5°C

Available for 710 of 712 hourly samples

Compared With Previous Septembers

Historical baseline from 9,996 observations across 7 years.

Wave Height
2.1ft
0.3ft below mean
Historical mean 2.395ft
Wave Period
5.2s
0.2s below mean
Historical mean 5.4s
Water Temperature
18.7°C
1.2°C above mean
Historical mean 17.5°C

Chart showing grouped wave observations for Lowestoft. 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 Lowestoft wave buoy

Lowestoft is a Channel Coastal Observatory wave station off the Suffolk coast at Britain's most easterly town. Its North Sea observations provide local context for the harbour approaches, developed seafront and low-lying coastline around Lowestoft and northern Suffolk.

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.
Lowestoft wave buoy daily means Sep 2023Last observation shown
Metric
Mean significant wave height (ft)221111111111522233562115322321
Mean maximum wave height (ft)2321222211227333547104228644532
Mean peak period (s)4455445544347643566791056544555
Mean zero-crossing period (s)334334343333543344454334433443
Mean energy period (s)------------------------------
Mean wave power, kilowatts per metre------------------------------
Mean peak wave directionESEconcentration 76%ENEconcentration 87%ENEconcentration 89%ENEconcentration 92%Econcentration 88%NEconcentration 94%NEconcentration 98%NEconcentration 97%Econcentration 94%Econcentration 84%SSEconcentration 82%Econcentration 62%NEconcentration 97%ENEconcentration 69%SEconcentration 95%ENEconcentration 77%NEconcentration 97%SEconcentration 64%Sconcentration 99%Sconcentration 100%SEconcentration 45%NEconcentration 45%NEconcentration 67%Sconcentration 96%Sconcentration 99%SSEconcentration 99%SSEconcentration 98%SSEconcentration 98%SEconcentration 62%Econcentration 66%
Mean directional spread (°)44.542.945.049.141.842.041.140.151.950.435.345.429.938.836.045.135.532.624.318.637.748.351.922.025.228.832.728.741.047.1
Mean water temperature(°C)18.518.518.618.718.818.919.119.119.619.519.519.519.319.219.119.119.019.018.818.818.618.518.318.318.218.118.118.017.917.7

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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