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M2 wave buoy daily means for May 2026

Daily means from the M2 wave buoy for May 2026, 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

744 wave-buoy observations covered all 31 days. Typical wave height was 2.7 ft (10th–90th percentile 1.2–5.4 ft), while mean peak wave period was 4.9 seconds (10th–90th percentile 3–6.7 seconds). Typical wind was 14 mph (10th–90th percentile 6–24.4 mph) and mean water temperature was 10.7°C (10th–90th percentile 9.9–12.3°C). 4 of 4,464 checked values (0.1%) were excluded by quality control. Across 14 comparable years, mean wave height was above the same-month mean of 2.8 ft and mean wave period was below the same-month mean of 5.1 seconds.

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

Typical Significant Wave Height

2.7ft
Mean: 2.9 ft
P10–P90: 1.2 — 5.4 ft
Recorded extremes

0.4 — 8.1 ft

Mean Observed Wave Period

4.9secs
P10–P90: 3 — 6.7secs
Recorded extremes

2.5 — 15.4secs

Available for 740 of 744 hourly samples

Typical Observed Wind

Variable, 14mph
Mean: 14.7 mph
P10–P90: 6 — 24.4 mph
Recorded extremes

1.3 — 32.5 mph

Circular concentration: 19%

Mean Water Temperature

10.7°C
P10–P90: 9.9 — 12.3°C
Recorded extremes

9.6 — 13.6°C

Compared With Previous Mays

Historical baseline from 10,275 observations across 14 years.

Wave Height
2.9ft
0.1ft above mean
Historical mean 2.756ft
Wave Period
4.9s
0.2s below mean
Historical mean 5.1s
Water Temperature
10.7°C
0.3°C above mean
Historical mean 10.4°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 May 2026Last observation shown
Metric
Mean significant wave height (ft)22122222QC rejected3335642336453321234332
Mean maximum wave height (ft)43232433954599735410775432256543
Mean peak period (s)4444453365445654457854548655545
Mean zero-crossing period (s)4333343354444544445544444444444
Mean peak wave directionEconcentration 36%Sconcentration 92%Variableconcentration 27%NNEconcentration 92%Nconcentration 86%NEconcentration 94%Sconcentration 78%SSEconcentration 47%Nconcentration 100%NNEconcentration 94%Nconcentration 87%NWconcentration 65%NNWconcentration 88%Nconcentration 89%NNEconcentration 97%NNEconcentration 34%WSWconcentration 66%Sconcentration 85%SSEconcentration 98%Sconcentration 99%Sconcentration 98%Sconcentration 98%Sconcentration 97%SSEconcentration 85%Sconcentration 81%NNEconcentration 33%NNEconcentration 84%ENEconcentration 50%SSWconcentration 95%Sconcentration 94%SSWconcentration 83%
Mean wave directionESEconcentration 58%Sconcentration 95%Econcentration 56%NNEconcentration 94%NNEconcentration 82%NEconcentration 96%Sconcentration 61%SSEconcentration 57%Nconcentration 100%NNEconcentration 96%Nconcentration 87%NWconcentration 67%NWconcentration 89%Nconcentration 92%Nconcentration 99%NEconcentration 33%WSWconcentration 73%SSWconcentration 86%Sconcentration 98%SSWconcentration 99%Sconcentration 98%Sconcentration 98%Sconcentration 98%SSEconcentration 94%Sconcentration 88%NNEconcentration 37%NNEconcentration 90%ENEconcentration 55%SSWconcentration 98%Sconcentration 94%SSWconcentration 96%
Mean directional spread (°)189.0190.0201.7182.4174.8183.5196.3211.1113.7184.7192.8190.8178.2170.2160.7207.9183.7158.8139.0139.7155.6183.1171.6170.2128.4138.8183.8179.9168.6187.2190.8
Mean wind directionSSEconcentration 81%Sconcentration 93%NNEconcentration 90%NNEconcentration 98%NNWconcentration 91%ESEconcentration 59%Sconcentration 98%Variableconcentration 14%Nconcentration 98%NNEconcentration 87%Variableconcentration 27%WNWconcentration 83%WNWconcentration 95%NNWconcentration 95%NWconcentration 80%SWconcentration 58%SWconcentration 81%SSWconcentration 65%Sconcentration 98%SSWconcentration 96%Sconcentration 93%Sconcentration 93%SSWconcentration 91%SSEconcentration 95%ESEconcentration 73%NEconcentration 86%ENEconcentration 89%SSEconcentration 81%SSWconcentration 98%Sconcentration 92%SSWconcentration 86%
Mean wind speed (mph)1313911910151124141317272315916152517211812115111617151511
Mean water temperature(°C)9.89.79.99.910.010.110.210.610.110.110.310.310.210.210.310.310.310.410.410.610.610.610.911.512.212.811.811.712.212.512.6

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