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Lowestoft wave buoy daily means for May 2025

Daily means from the Lowestoft wave buoy for May 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

1,484 wave-buoy observations covered all 31 days. Typical wave height was 2.5 ft (10th–90th percentile 1.2–3.6 ft), while mean average of more than one wave period type was 5.3 seconds (10th–90th percentile 3.9–6.7 seconds). Mean water temperature was 12.9°C (10th–90th percentile 11.6–14°C). All 5,929 checked values passed quality control. Across 9 comparable years, mean wave height was above the same-month mean of 2.2 ft and mean wave period was the same as the same-month mean of 5.3 seconds.

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

Typical Significant Wave Height

2.5ft
Mean: 2.5 ft
P10–P90: 1.2 — 3.6 ft
Recorded extremes

0.4 — 6.1 ft

Mean Observed Wave Period

5.3secs
P10–P90: 3.9 — 6.7secs
Recorded extremes

1.9 — 11.8secs

Observed Wave Direction

ENE

Circular concentration: 65%

Mean Water Temperature

12.9°C
P10–P90: 11.6 — 14°C
Recorded extremes

11.2 — 15.6°C

Compared With Previous Mays

Historical baseline from 13,191 observations across 9 years.

Wave Height
2.5ft
0.3ft above mean
Historical mean 2.165ft
Wave Period
5.3s
In line with the historical mean
Historical mean 5.3s
Water Temperature
12.9°C
1.4°C above mean
Historical mean 11.5°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 May 2025Last observation shown
Metric
Mean significant wave height (ft)1124533322223343322234322232221
Mean maximum wave height (ft)1236754533334465543345534354331
Mean peak period (s)5446655544556566665467756566553
Mean zero-crossing period (s)4334444433344344444344444444443
Mean energy period (s)-------------------------------
Mean wave power, kilowatts per metre-------------------------------
Mean peak wave directionEconcentration 82%NNEconcentration 69%NEconcentration 81%NNEconcentration 98%NEconcentration 99%NEconcentration 98%NEconcentration 98%NEconcentration 98%ENEconcentration 91%Econcentration 96%ENEconcentration 97%NEconcentration 97%NEconcentration 97%NEconcentration 94%NEconcentration 98%NEconcentration 97%NEconcentration 98%NEconcentration 99%NEconcentration 98%NNEconcentration 94%NEconcentration 97%NEconcentration 99%NEconcentration 99%SSEconcentration 93%SSEconcentration 91%SSEconcentration 89%SSEconcentration 98%SSEconcentration 98%SSEconcentration 89%SSEconcentration 97%SSEconcentration 92%
Mean directional spread (°)53.139.337.031.028.132.633.432.939.439.536.733.232.034.532.634.033.135.937.734.132.532.534.240.835.739.027.033.532.831.342.5
Mean water temperature(°C)11.711.812.011.911.811.611.611.611.812.112.312.612.813.012.912.812.813.013.313.513.613.613.513.513.713.713.813.914.114.414.7

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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.

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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