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M2 wave buoy daily means for Apr 2025

Daily means from the M2 wave buoy for Apr 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

701 wave-buoy observations covered all 30 days. Typical wave height was 2.7 ft (10th–90th percentile 0.8–5.4 ft), while mean peak wave period was 5.9 seconds (10th–90th percentile 3.3–10 seconds). Typical wind was 12.8 mph (10th–90th percentile 4.7–23.3 mph) and mean water temperature was 9.7°C (10th–90th percentile 9.1–10.2°C). 7 of 4,206 checked values (0.2%) were excluded by quality control. Across 13 comparable years, mean wave height was below the same-month mean of 3.1 ft and mean wave period was above the same-month mean of 5.2 seconds.

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

Typical Significant Wave Height

2.7ft
Mean: 2.9 ft
P10–P90: 0.8 — 5.4 ft
Recorded extremes

0.4 — 8.1 ft

Mean Observed Wave Period

5.9secs
P10–P90: 3.3 — 10secs
Recorded extremes

2.5 — 18.2secs

Available for 694 of 701 hourly samples

Typical Observed Wind

ESE, 12.8mph
Mean: 13.5 mph
P10–P90: 4.7 — 23.3 mph
Recorded extremes

0.7 — 32.2 mph

Circular concentration: 45%

Mean Water Temperature

9.7°C
P10–P90: 9.1 — 10.2°C
Recorded extremes

8.9 — 12°C

Compared With Previous Aprils

Historical baseline from 9,245 observations across 13 years.

Wave Height
2.9ft
0.2ft below mean
Historical mean 3.117ft
Wave Period
5.9s
0.7s above mean
Historical mean 5.2s
Water Temperature
9.7°C
0.9°C above mean
Historical mean 8.8°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 Apr 2025Last observation shown
Metric
Mean significant wave height (ft)245475212111343524532352334211
Mean maximum wave height (ft)3687118323212574946852584457422
Mean peak period (s)455566671411105465655653566455488
Mean zero-crossing period (s)344455445444444544443444444455
Mean peak wave directionEconcentration 63%ENEconcentration 91%NEconcentration 95%NEconcentration 96%NEconcentration 98%ENEconcentration 99%Econcentration 61%SSEconcentration 61%Sconcentration 94%Sconcentration 87%Sconcentration 95%SSWconcentration 73%Wconcentration 64%Sconcentration 99%Variableconcentration 24%NNEconcentration 97%Variableconcentration 20%ENEconcentration 93%ENEconcentration 79%ENEconcentration 86%Sconcentration 73%Sconcentration 87%SEconcentration 71%ESEconcentration 46%SSEconcentration 90%Sconcentration 97%Sconcentration 99%Sconcentration 96%Sconcentration 60%Sconcentration 52%
Mean wave directionEconcentration 78%ENEconcentration 98%NEconcentration 96%NEconcentration 97%ENEconcentration 99%ENEconcentration 99%Econcentration 96%SEconcentration 88%SEconcentration 71%SEconcentration 83%Sconcentration 95%SSWconcentration 81%Wconcentration 67%Sconcentration 99%Variableconcentration 19%Nconcentration 96%SSWconcentration 42%Econcentration 95%Econcentration 85%ENEconcentration 91%Sconcentration 89%Sconcentration 95%ESEconcentration 93%ESEconcentration 79%SSEconcentration 90%Sconcentration 98%Sconcentration 99%Sconcentration 98%Sconcentration 64%Sconcentration 51%
Mean directional spread (°)229.3190.3156.6178.3113.4136.5172.6131.2103.1107.2102.0156.0167.8156.6155.7152.9209.6181.1174.8189.0196.1156.9161.5198.6219.3176.8171.0197.4127.4120.0
Mean wind directionESEconcentration 90%Econcentration 91%ENEconcentration 100%ENEconcentration 98%ENEconcentration 100%ENEconcentration 96%ENEconcentration 86%NNEconcentration 59%NNEconcentration 90%SEconcentration 49%Sconcentration 94%Sconcentration 87%WSWconcentration 72%Sconcentration 98%NNWconcentration 59%NNWconcentration 80%SSWconcentration 46%Econcentration 98%Econcentration 98%ESEconcentration 85%SSWconcentration 87%Sconcentration 69%ENEconcentration 90%ESEconcentration 87%SEconcentration 98%Sconcentration 96%Sconcentration 99%Sconcentration 92%Econcentration 92%Econcentration 69%
Mean wind speed (mph)9162218241464106610161916221216171011171481618231555
Mean water temperature(°C)9.19.19.19.19.29.39.49.59.59.69.89.89.89.79.69.59.69.59.59.79.89.99.910.110.110.110.110.210.410.5

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