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M2 wave buoy daily means for Aug 2023

Daily means from the M2 wave buoy for Aug 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

739 wave-buoy observations covered all 31 days. Typical wave height was 3.1 ft (10th–90th percentile 1.2–5.8 ft), while mean peak wave period was 5 seconds (10th–90th percentile 2.9–6.7 seconds). Typical wind was 14.9 mph (10th–90th percentile 7.2–23.2 mph) and mean water temperature was 15.2°C (10th–90th percentile 14.5–15.8°C). 6 of 4,434 checked values (0.1%) were excluded by quality control. Across 12 comparable years, mean wave height was above the same-month mean of 2.6 ft and mean wave period was below the same-month mean of 5.3 seconds.

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

Typical Significant Wave Height

3.1ft
Mean: 3.3 ft
P10–P90: 1.2 — 5.8 ft
Recorded extremes

0.8 — 15 ft

Mean Observed Wave Period

5secs
P10–P90: 2.9 — 6.7secs
Recorded extremes

2.3 — 16.6secs

Available for 733 of 739 hourly samples

Typical Observed Wind

SW, 14.9mph
Mean: 15.3 mph
P10–P90: 7.2 — 23.2 mph
Recorded extremes

0.7 — 41.1 mph

Circular concentration: 32%

Mean Water Temperature

15.2°C
P10–P90: 14.5 — 15.8°C
Recorded extremes

13.7 — 16.8°C

Compared With Previous Augusts

Historical baseline from 7,393 observations across 12 years.

Wave Height
3.3ft
0.7ft above mean
Historical mean 2.625ft
Wave Period
5s
0.3s below mean
Historical mean 5.3s
Water Temperature
15.2°C
0.5°C above mean
Historical mean 14.7°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 2023Last observation shown
Metric
Mean significant wave height (ft)34444222225QC rejected42212510553222343232
Mean maximum wave height (ft)67777433338964323916896344564454
Mean peak period (s)5555543544666558469865443444444
Mean zero-crossing period (s)4444443433454444356554433443344
Mean peak wave directionSWconcentration 60%Econcentration 62%Nconcentration 82%Nconcentration 54%ENEconcentration 42%NWconcentration 60%WSWconcentration 63%Sconcentration 90%Sconcentration 96%Sconcentration 90%Sconcentration 99%Sconcentration 100%Sconcentration 99%SSEconcentration 45%Wconcentration 41%Sconcentration 60%ENEconcentration 84%ENEconcentration 93%SSEconcentration 97%Sconcentration 99%Sconcentration 99%Sconcentration 87%Sconcentration 81%Wconcentration 51%Wconcentration 90%NNWconcentration 96%NWconcentration 85%NWconcentration 77%WNWconcentration 86%NWconcentration 67%SSEconcentration 65%
Mean wave directionSWconcentration 77%Econcentration 64%Nconcentration 89%Nconcentration 57%Econcentration 54%NWconcentration 39%WSWconcentration 68%SSEconcentration 99%Sconcentration 98%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 99%SEconcentration 58%WSWconcentration 47%SSEconcentration 90%Econcentration 89%Econcentration 99%SSEconcentration 92%Sconcentration 100%Sconcentration 99%Sconcentration 97%Sconcentration 99%WSWconcentration 70%Wconcentration 88%NNWconcentration 96%NWconcentration 90%NWconcentration 69%Wconcentration 83%NNWconcentration 64%SSEconcentration 71%
Mean directional spread (°)184.2185.6182.0189.4183.7202.7194.4171.4164.1172.0131.398.9141.2165.1155.9155.2188.8117.9116.0134.4137.8160.3194.4166.1172.3184.6183.6219.4171.4210.0208.2
Mean wind directionSWconcentration 74%NEconcentration 69%NWconcentration 97%Wconcentration 59%NNEconcentration 41%WNWconcentration 88%WSWconcentration 81%Variableconcentration 28%SSWconcentration 92%SSEconcentration 91%Sconcentration 98%SSWconcentration 95%SSWconcentration 97%Variableconcentration 15%Wconcentration 79%NEconcentration 78%ENEconcentration 98%Econcentration 99%Sconcentration 93%Sconcentration 98%Sconcentration 99%SWconcentration 89%SSWconcentration 83%Wconcentration 73%Wconcentration 89%NWconcentration 96%WNWconcentration 77%Wconcentration 78%WNWconcentration 97%Wconcentration 75%SSEconcentration 76%
Mean wind speed (mph)171917142012126121422201610128131929202313101315171813151414
Mean water temperature(°C)15.014.914.714.314.314.414.614.815.115.315.315.015.415.715.716.015.815.014.815.115.115.315.615.715.615.515.315.415.515.315.3

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