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M2 wave buoy daily means for Aug 2021

Daily means from the M2 wave buoy for Aug 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

736 wave-buoy observations covered all 31 days. Typical wave height was 2.1 ft (10th–90th percentile 1–4.1 ft), while mean peak wave period was 4.7 seconds (10th–90th percentile 3–6.7 seconds). Typical wind was 11.7 mph (10th–90th percentile 4.7–20.6 mph) and mean water temperature was 15.5°C (10th–90th percentile 14.9–16.6°C). 3 of 4,416 checked values (0.1%) were excluded by quality control. Across 10 comparable years, mean wave height was below the same-month mean of 2.8 ft and mean wave period was below the same-month mean of 5.5 seconds.

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

Typical Significant Wave Height

2.1ft
Mean: 2.4 ft
P10–P90: 1 — 4.1 ft
Recorded extremes

0 — 7.7 ft

Mean Observed Wave Period

4.7secs
P10–P90: 3 — 6.7secs
Recorded extremes

2.1 — 11secs

Available for 733 of 736 hourly samples

Typical Observed Wind

Variable, 11.7mph
Mean: 12.1 mph
P10–P90: 4.7 — 20.6 mph
Recorded extremes

0.8 — 29.3 mph

Circular concentration: 21%

Mean Water Temperature

15.5°C
P10–P90: 14.9 — 16.6°C
Recorded extremes

14.6 — 17.4°C

Compared With Previous Augusts

Historical baseline from 5,922 observations across 10 years.

Wave Height
2.4ft
0.4ft below mean
Historical mean 2.756ft
Wave Period
4.7s
0.8s below mean
Historical mean 5.5s
Water Temperature
15.5°C
1°C above mean
Historical mean 14.5°C

Chart showing grouped wave observations for M2. 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 M2 wave buoy

M2 (WMO 62091) is part of the Irish Marine Data Buoy Observation Network, managed by the Marine Institute in collaboration with Met Éireann. Moored in the Irish Sea east of Ireland, it provides open-water context for the busy, relatively enclosed waters between the Irish and British coasts.

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

Metrics are rows; days run left to right.
M2 wave buoy daily means Aug 2021Last observation shown
Metric
Mean significant wave height (ft)2212544432344223321342111111223
Mean maximum wave height (ft)3203756632565325432452000110234
Mean peak period (s)4433666544565554444466755545445
Mean zero-crossing period (s)3333444443454444433444433333334
Mean peak wave directionNNEconcentration 81%Nconcentration 61%SWconcentration 70%SSWconcentration 98%Sconcentration 97%SSWconcentration 85%SSWconcentration 77%Wconcentration 91%SSWconcentration 86%SSWconcentration 59%Sconcentration 98%Sconcentration 99%Sconcentration 97%SSEconcentration 90%SSEconcentration 57%NWconcentration 98%WNWconcentration 96%WNWconcentration 86%SSEconcentration 66%Sconcentration 96%Sconcentration 99%SSWconcentration 74%Sconcentration 90%ESEconcentration 52%ENEconcentration 44%NNEconcentration 66%ENEconcentration 83%Econcentration 59%NNEconcentration 57%NEconcentration 94%NEconcentration 97%
Mean wave directionNNEconcentration 90%Nconcentration 63%SWconcentration 84%SSWconcentration 99%Sconcentration 98%Sconcentration 94%SSWconcentration 86%WSWconcentration 97%SSWconcentration 94%SSWconcentration 56%Sconcentration 99%Sconcentration 99%Sconcentration 99%Sconcentration 92%SSEconcentration 67%NWconcentration 98%WNWconcentration 97%Wconcentration 85%SSEconcentration 79%Sconcentration 97%Sconcentration 99%SSWconcentration 88%SSEconcentration 90%ESEconcentration 84%Econcentration 68%NEconcentration 76%ENEconcentration 90%Econcentration 79%NNEconcentration 54%NEconcentration 96%NEconcentration 99%
Mean directional spread (°)33.729.928.521.823.829.324.333.127.234.726.323.228.535.532.528.228.532.239.128.125.129.730.536.436.728.934.934.424.625.125.0
Mean wind directionNconcentration 90%WNWconcentration 64%SSWconcentration 79%Sconcentration 99%SSEconcentration 98%SWconcentration 90%WSWconcentration 90%Wconcentration 98%SWconcentration 91%WSWconcentration 49%Sconcentration 88%SSWconcentration 97%SWconcentration 96%SWconcentration 46%Variableconcentration 28%WNWconcentration 98%WNWconcentration 97%Wconcentration 88%Sconcentration 40%Sconcentration 98%Sconcentration 92%WSWconcentration 80%NNEconcentration 80%NEconcentration 89%Nconcentration 65%Nconcentration 85%ENEconcentration 87%SEconcentration 31%NNEconcentration 91%NEconcentration 95%NEconcentration 96%
Mean wind speed (mph)109916221619181591417151112171613516149574894101214
Mean water temperature(°C)16.516.717.016.916.316.116.015.715.415.014.914.815.215.215.115.015.115.115.315.115.115.415.315.315.415.415.315.715.415.215.1

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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 Met Éireann Irish Marine Data Buoy Observation Network.

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

› Wave Buoy List