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M2 wave buoy daily means for Sep 2024

Daily means from the M2 wave buoy for Sep 2024, 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

698 wave-buoy observations covered all 30 days. Typical wave height was 3.5 ft (10th–90th percentile 1.2–6.5 ft), while mean peak wave period was 5.1 seconds (10th–90th percentile 3.3–6.7 seconds). Typical wind was 16.2 mph (10th–90th percentile 6.2–24.6 mph) and mean water temperature was 14.5°C (10th–90th percentile 14.2–14.8°C). 3 of 4,188 checked values (0.1%) were excluded by quality control. Across 13 comparable years, mean wave height was above the same-month mean of 3.4 ft and mean wave period was below the same-month mean of 5.2 seconds.

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

Typical Significant Wave Height

3.5ft
Mean: 3.7 ft
P10–P90: 1.2 — 6.5 ft
Recorded extremes

0.4 — 13.5 ft

Mean Observed Wave Period

5.1secs
P10–P90: 3.3 — 6.7secs
Recorded extremes

2.6 — 15.4secs

Available for 695 of 698 hourly samples

Typical Observed Wind

Variable, 16.2mph
Mean: 15.8 mph
P10–P90: 6.2 — 24.6 mph
Recorded extremes

1.2 — 34.5 mph

Circular concentration: 28%

Mean Water Temperature

14.5°C
P10–P90: 14.2 — 14.8°C
Recorded extremes

13.9 — 15.1°C

Compared With Previous Septembers

Historical baseline from 8,486 observations across 13 years.

Wave Height
3.7ft
0.3ft above mean
Historical mean 3.379ft
Wave Period
5.1s
0.1s below mean
Historical mean 5.2s
Water Temperature
14.5°C
0.3°C below 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 Sep 2024Last observation shown
Metric
Mean significant wave height (ft)322355QC rejected35564364112234443378367
Mean maximum wave height (ft)5335783588974107223446765412135912
Mean peak period (s)544456445555466664445554477469
Mean zero-crossing period (s)444445444444455444444444455455
Mean peak wave directionNEconcentration 93%NNEconcentration 69%NWconcentration 53%NWconcentration 94%NNEconcentration 94%NEconcentration 96%NNEconcentration 83%Nconcentration 92%NNWconcentration 81%Wconcentration 90%NWconcentration 92%NNWconcentration 94%Variableconcentration 17%Sconcentration 100%Sconcentration 99%Sconcentration 96%Sconcentration 66%ENEconcentration 76%ENEconcentration 87%ENEconcentration 91%NEconcentration 89%NEconcentration 93%NNEconcentration 93%NNWconcentration 93%NNEconcentration 63%NEconcentration 72%NNEconcentration 99%WNWconcentration 74%SSEconcentration 93%Variableconcentration 26%
Mean wave directionENEconcentration 92%NNEconcentration 73%NWconcentration 49%NWconcentration 92%NNEconcentration 96%NEconcentration 95%NEconcentration 90%Nconcentration 90%NNWconcentration 84%Wconcentration 91%NWconcentration 95%NNWconcentration 95%Variableconcentration 28%Sconcentration 100%Sconcentration 99%SSEconcentration 98%SSEconcentration 90%Econcentration 77%ENEconcentration 90%ENEconcentration 91%ENEconcentration 93%NEconcentration 94%NNEconcentration 95%NNWconcentration 96%NNEconcentration 74%ENEconcentration 84%NNEconcentration 98%NWconcentration 71%SSEconcentration 92%ENEconcentration 61%
Mean directional spread (°)192.2197.9221.0207.2192.6177.3238.6214.7179.9213.9178.3201.1215.5112.8127.2156.6189.3202.7207.5214.0207.7185.3213.8202.4200.8175.1111.4208.4155.6148.6
Mean wind directionEconcentration 92%NNWconcentration 77%Wconcentration 72%NWconcentration 76%NNEconcentration 95%Nconcentration 96%NNEconcentration 84%NWconcentration 92%WNWconcentration 84%Wconcentration 94%WNWconcentration 98%NWconcentration 95%WSWconcentration 64%SSWconcentration 99%WSWconcentration 84%SEconcentration 43%ESEconcentration 85%ENEconcentration 70%ENEconcentration 96%NEconcentration 97%NEconcentration 95%NEconcentration 92%Nconcentration 94%WNWconcentration 97%Variableconcentration 22%ENEconcentration 44%NNWconcentration 94%WSWconcentration 81%SEconcentration 86%Nconcentration 63%
Mean wind speed (mph)9811161916101519222419132214649131519191815112126162421
Mean water temperature(°C)14.814.614.614.614.514.614.314.214.214.214.514.514.414.314.314.514.514.514.614.614.614.614.514.514.414.514.614.614.714.7

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