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M2 wave buoy daily means for Aug 2025

Daily means from the M2 wave buoy for Aug 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

724 wave-buoy observations covered all 31 days. Typical wave height was 2.7 ft (10th–90th percentile 0.8–5 ft), while mean peak wave period was 5.2 seconds (10th–90th percentile 2.9–7.7 seconds). Typical wind was 12.8 mph (10th–90th percentile 5.1–23.4 mph) and mean water temperature was 15.1°C (10th–90th percentile 14.6–15.7°C). 9 of 4,344 checked values (0.2%) were excluded by quality control. Across 14 comparable years, mean wave height was the same as the same-month mean of 2.8 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

2.7ft
Mean: 2.8 ft
P10–P90: 0.8 — 5 ft
Recorded extremes

0.4 — 9.6 ft

Mean Observed Wave Period

5.2secs
P10–P90: 2.9 — 7.7secs
Recorded extremes

2.5 — 22.3secs

Available for 715 of 724 hourly samples

Typical Observed Wind

Variable, 12.8mph
Mean: 13.6 mph
P10–P90: 5.1 — 23.4 mph
Recorded extremes

1 — 35 mph

Circular concentration: 29%

Mean Water Temperature

15.1°C
P10–P90: 14.6 — 15.7°C
Recorded extremes

13.9 — 16.6°C

Compared With Previous Augusts

Historical baseline from 8,855 observations across 14 years.

Wave Height
2.8ft
0ft above mean
Historical mean 2.756ft
Wave Period
5.2s
0.1s below mean
Historical mean 5.3s
Water Temperature
15.1°C
0.3°C above mean
Historical mean 14.8°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 2025Last observation shown
Metric
Mean significant wave height (ft)322543433211212223332111344434QC rejected
Mean maximum wave height (ft)53497575642122333545321245765713
Mean peak period (s)54455464545-6544455534544-66457
Mean zero-crossing period (s)4334444444444444344433434444445
Mean peak wave directionNconcentration 94%Nconcentration 53%WSWconcentration 68%SWconcentration 60%WNWconcentration 96%WSWconcentration 59%SSWconcentration 91%SWconcentration 83%Sconcentration 95%SWconcentration 70%Sconcentration 75%SSEconcentration 63%Sconcentration 72%Sconcentration 90%NEconcentration 42%NNEconcentration 86%ENEconcentration 95%ENEconcentration 97%NEconcentration 97%NEconcentration 94%ENEconcentration 76%WSWconcentration 51%Sconcentration 77%Sconcentration 77%Sconcentration 90%Sconcentration 96%Sconcentration 99%Sconcentration 98%WSWconcentration 76%SSWconcentration 65%Sconcentration 100%
Mean wave directionNconcentration 93%Nconcentration 63%SWconcentration 85%SWconcentration 75%Wconcentration 98%WSWconcentration 66%SSWconcentration 96%SWconcentration 90%SSWconcentration 98%SSWconcentration 87%SSEconcentration 88%SEconcentration 53%SSEconcentration 84%Sconcentration 96%ENEconcentration 46%NNEconcentration 89%ENEconcentration 95%ENEconcentration 97%NEconcentration 96%NEconcentration 96%NEconcentration 92%SSWconcentration 46%Sconcentration 87%Sconcentration 90%Sconcentration 93%Sconcentration 99%Sconcentration 98%SSWconcentration 100%SWconcentration 92%SSWconcentration 82%SSWconcentration 100%
Mean directional spread (°)187.6199.9178.6157.0203.8154.2118.7162.8162.8187.3215.1152.4183.6184.2187.7177.9179.7165.6193.9199.7193.7170.0169.3197.9191.4185.5145.9156.2142.5138.393.3
Mean wind directionNNWconcentration 88%WSWconcentration 35%WSWconcentration 71%WSWconcentration 65%WNWconcentration 97%SWconcentration 72%SWconcentration 87%SSWconcentration 86%SWconcentration 92%SSWconcentration 65%SSEconcentration 54%NEconcentration 91%Sconcentration 82%Sconcentration 90%NNEconcentration 94%NEconcentration 88%ENEconcentration 96%ENEconcentration 72%NEconcentration 96%NEconcentration 93%ENEconcentration 44%SWconcentration 75%Sconcentration 61%SSEconcentration 95%SSEconcentration 97%SSWconcentration 95%Sconcentration 86%SSWconcentration 98%WSWconcentration 89%SSWconcentration 76%Sconcentration 98%
Mean wind speed (mph)159132319171719141477118711101013117871017171917152030
Mean water temperature(°C)15.515.615.915.615.015.115.115.015.115.014.814.714.614.614.714.814.814.814.714.714.815.015.014.814.915.315.615.615.415.315.1

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