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M2 wave buoy daily means for Oct 2021

Daily means from the M2 wave buoy for Oct 2021, 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

743 wave-buoy observations covered all 31 days. Typical wave height was 4.1 ft (10th–90th percentile 2.1–7.7 ft), while mean peak wave period was 5.7 seconds (10th–90th percentile 3.5–8.3 seconds). Typical wind was 19 mph (10th–90th percentile 11–27.3 mph) and mean water temperature was 14.5°C (10th–90th percentile 13.9–15°C). 1 of 4,458 checked values (0%) were excluded by quality control. Across 11 comparable years, mean wave height was above the same-month mean of 4.2 ft and mean wave period was above the same-month mean of 5.6 seconds.

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

Typical Significant Wave Height

4.1ft
Mean: 4.7 ft
P10–P90: 2.1 — 7.7 ft
Recorded extremes

0.5 — 12.8 ft

Mean Observed Wave Period

5.7secs
P10–P90: 3.5 — 8.3secs
Recorded extremes

2.1 — 12secs

Available for 742 of 743 hourly samples

Typical Observed Wind

SW, 19mph
Mean: 19 mph
P10–P90: 11 — 27.3 mph
Recorded extremes

0.7 — 35.4 mph

Circular concentration: 63%

Mean Water Temperature

14.5°C
P10–P90: 13.9 — 15°C
Recorded extremes

13.9 — 15.3°C

Compared With Previous Octobers

Historical baseline from 7,434 observations across 11 years.

Wave Height
4.7ft
0.5ft above mean
Historical mean 4.167ft
Wave Period
5.7s
0.1s above mean
Historical mean 5.6s
Water Temperature
14.5°C
0.4°C above mean
Historical mean 14.1°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 Oct 2021Last observation shown
Metric
Mean significant wave height (ft)65546455322322235653647846108458
Mean maximum wave height (ft)978586773223234488749610126814115711
Mean peak period (s)6666656654443454666864685688678
Mean zero-crossing period (s)5554545443343343555454554566455
Mean peak wave directionSSWconcentration 88%Sconcentration 91%SWconcentration 84%Sconcentration 98%NNWconcentration 65%Variableconcentration 22%Sconcentration 99%Sconcentration 99%Sconcentration 88%NWconcentration 83%NNWconcentration 81%NWconcentration 95%WNWconcentration 87%SWconcentration 71%NNEconcentration 61%SSWconcentration 97%Sconcentration 99%Sconcentration 99%Sconcentration 99%Sconcentration 88%NNWconcentration 91%Wconcentration 97%SSWconcentration 98%Sconcentration 100%SSWconcentration 94%Sconcentration 98%Sconcentration 100%Sconcentration 99%SSWconcentration 70%Sconcentration 96%Sconcentration 96%
Mean wave directionSSWconcentration 93%SSWconcentration 96%SSWconcentration 97%Sconcentration 99%NNWconcentration 72%Variableconcentration 24%Sconcentration 100%Sconcentration 100%Sconcentration 98%NWconcentration 85%NWconcentration 96%NWconcentration 95%WNWconcentration 88%SWconcentration 86%NNEconcentration 69%Sconcentration 98%Sconcentration 99%Sconcentration 100%Sconcentration 100%SSWconcentration 90%NWconcentration 92%Wconcentration 93%SSWconcentration 99%Sconcentration 100%SSWconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 100%SSWconcentration 64%SSWconcentration 99%Sconcentration 99%
Mean directional spread (°)25.323.326.225.931.136.324.025.733.735.733.527.031.130.437.427.021.323.025.427.027.429.524.122.026.520.617.919.626.520.920.0
Mean wind directionWSWconcentration 91%SWconcentration 81%WSWconcentration 97%SWconcentration 79%NWconcentration 91%WSWconcentration 73%Sconcentration 98%Sconcentration 99%SSWconcentration 74%NWconcentration 93%WNWconcentration 93%NWconcentration 98%WNWconcentration 91%WSWconcentration 92%NEconcentration 59%SSWconcentration 99%SSWconcentration 99%Sconcentration 97%SSWconcentration 94%WNWconcentration 91%NWconcentration 95%Wconcentration 97%SSWconcentration 97%SSWconcentration 98%WSWconcentration 99%SSWconcentration 99%SSWconcentration 100%SSWconcentration 89%WSWconcentration 36%WSWconcentration 90%SWconcentration 73%
Mean wind speed (mph)2419231524182319141212151215917192119142419262419232918161724
Mean water temperature(°C)14.914.714.614.614.314.314.514.614.814.814.815.015.014.914.714.614.614.614.714.614.514.514.614.514.314.013.914.013.914.014.4

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