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M2 wave buoy daily means for Aug 2020

Daily means from the M2 wave buoy for Aug 2020, 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

740 wave-buoy observations covered all 31 days. Typical wave height was 2.3 ft (10th–90th percentile 1.2–6.9 ft), while mean peak wave period was 5.2 seconds (10th–90th percentile 3.3–7.6 seconds). Typical wind was 12.1 mph (10th–90th percentile 6.4–25.1 mph) and mean water temperature was 14.7°C (10th–90th percentile 13.9–15.4°C). All 2,958 checked values passed quality control. Across 9 comparable years, mean wave height was above the same-month mean of 2.7 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

2.3ft
Mean: 3.2 ft
P10–P90: 1.2 — 6.9 ft
Recorded extremes

0.8 — 11.5 ft

Available for 246 of 740 hourly samples

Mean Observed Wave Period

5.2secs
P10–P90: 3.3 — 7.6secs
Recorded extremes

2.1 — 11secs

Available for 246 of 740 hourly samples

Typical Observed Wind

Variable, 12.1mph
Mean: 13.8 mph
P10–P90: 6.4 — 25.1 mph
Recorded extremes

1.1 — 37 mph

Circular concentration: 1%

Mean Water Temperature

14.7°C
P10–P90: 13.9 — 15.4°C
Recorded extremes

13.1 — 16.3°C

Compared With Previous Augusts

Historical baseline from 5,182 observations across 9 years.

Wave Height
3.2ft
0.5ft above mean
Historical mean 2.723ft
Wave Period
5.2s
0.3s below mean
Historical mean 5.5s
Water Temperature
14.7°C
0.3°C above mean
Historical mean 14.4°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 2020Last observation shown
Metric
Mean significant wave height (ft)221QC rejectedQC rejected22122222222222995327425522
Mean maximum wave height (ft)3317832242223323223131374312637731
Mean peak period (s)5546774354445544454888556666543
Mean zero-crossing period (s)4434543344334433344665445545443
Mean peak wave directionSconcentration 40%SWconcentration 73%SWconcentration 48%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 86%NNEconcentration 53%NEconcentration 90%NNEconcentration 93%NNEconcentration 96%NNEconcentration 67%Nconcentration 99%NNEconcentration 97%NEconcentration 94%ENEconcentration 97%ENEconcentration 82%SSEconcentration 69%SEconcentration 72%Sconcentration 99%Sconcentration 100%Sconcentration 94%WSWconcentration 81%SSEconcentration 58%Sconcentration 54%SWconcentration 47%SSEconcentration 93%NNEconcentration 53%Nconcentration 99%Nconcentration 99%SSEconcentration 65%
Mean wave directionSSWconcentration 77%SSWconcentration 91%SWconcentration 79%Sconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 98%ENEconcentration 62%NEconcentration 94%NNEconcentration 96%NNEconcentration 98%NNEconcentration 94%NNEconcentration 99%NNEconcentration 97%NEconcentration 96%NEconcentration 97%ENEconcentration 85%SSEconcentration 75%SEconcentration 77%Sconcentration 99%Sconcentration 99%Sconcentration 98%SWconcentration 99%SEconcentration 45%SSEconcentration 66%SWconcentration 66%SSEconcentration 99%NEconcentration 74%Nconcentration 100%NNEconcentration 95%SSEconcentration 80%
Mean directional spread (°)36.630.231.326.421.626.033.128.524.830.129.722.022.926.227.930.427.226.229.419.920.325.334.641.525.735.029.724.822.933.230.8
Mean wind directionWSWconcentration 74%WSWconcentration 79%WSWconcentration 66%SSWconcentration 97%SSWconcentration 86%Sconcentration 68%Sconcentration 85%Nconcentration 98%NEconcentration 92%NNEconcentration 88%Nconcentration 97%Nconcentration 94%NNEconcentration 98%NNEconcentration 95%ENEconcentration 96%ENEconcentration 98%Econcentration 70%SSWconcentration 76%SEconcentration 69%SSEconcentration 98%SSWconcentration 90%SWconcentration 90%WSWconcentration 96%ENEconcentration 42%Sconcentration 39%WSWconcentration 78%SEconcentration 48%NNEconcentration 96%Nconcentration 99%Nconcentration 62%Sconcentration 93%
Mean wind speed (mph)10121023191212101199111110913111014292417149261482120912
Mean water temperature(°C)14.514.514.314.114.114.214.214.414.615.014.914.914.615.215.415.415.015.214.614.114.414.414.514.614.614.814.814.714.715.014.9

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 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