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M2 wave buoy daily means for Jul 2025

Daily means from the M2 wave buoy for Jul 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

728 wave-buoy observations covered all 31 days. Typical wave height was 1.9 ft (10th–90th percentile 0.8–3.8 ft), while mean peak wave period was 4.4 seconds (10th–90th percentile 2.8–7.1 seconds). Typical wind was 10.8 mph (10th–90th percentile 5.5–19.3 mph) and mean water temperature was 14.6°C (10th–90th percentile 13.5–15.7°C). 5 of 4,368 checked values (0.1%) were excluded by quality control. Across 13 comparable years, mean wave height was below the same-month mean of 2.4 ft and mean wave period was below the same-month mean of 4.8 seconds.

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

Typical Significant Wave Height

1.9ft
Mean: 2.2 ft
P10–P90: 0.8 — 3.8 ft
Recorded extremes

0.4 — 8.5 ft

Mean Observed Wave Period

4.4secs
P10–P90: 2.8 — 7.1secs
Recorded extremes

2.5 — 11.1secs

Available for 723 of 728 hourly samples

Typical Observed Wind

Variable, 10.8mph
Mean: 11.6 mph
P10–P90: 5.5 — 19.3 mph
Recorded extremes

0.9 — 30 mph

Circular concentration: 27%

Mean Water Temperature

14.6°C
P10–P90: 13.5 — 15.7°C
Recorded extremes

12.8 — 16.7°C

Compared With Previous Julys

Historical baseline from 9,072 observations across 13 years.

Wave Height
2.2ft
0.2ft below mean
Historical mean 2.428ft
Wave Period
4.4s
0.4s below mean
Historical mean 4.8s
Water Temperature
14.6°C
0.6°C above mean
Historical mean 14°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 Jul 2025Last observation shown
Metric
Mean significant wave height (ft)3224435311111363222233221212222
Mean maximum wave height (ft)5446657422212594343344342323332
Mean peak period (s)4445545434334475655684443333443
Mean zero-crossing period (s)4434444433333454444454443333333
Mean peak wave directionNconcentration 61%Nconcentration 89%WSWconcentration 66%SSWconcentration 85%SSWconcentration 85%NWconcentration 95%NNWconcentration 97%NNWconcentration 56%WSWconcentration 56%WSWconcentration 43%SWconcentration 71%Variableconcentration 21%ENEconcentration 66%Sconcentration 58%Sconcentration 99%Variableconcentration 17%Sconcentration 97%Sconcentration 97%Sconcentration 95%SEconcentration 42%SSWconcentration 70%WNWconcentration 61%NWconcentration 40%NNEconcentration 85%Sconcentration 52%Wconcentration 72%Wconcentration 62%WNWconcentration 64%WNWconcentration 55%SWconcentration 30%Nconcentration 36%
Mean wave directionNconcentration 59%Nconcentration 94%WSWconcentration 72%SWconcentration 93%SWconcentration 98%WNWconcentration 90%Nconcentration 99%NNWconcentration 43%SWconcentration 71%SWconcentration 53%SSWconcentration 74%Variableconcentration 10%ENEconcentration 79%Sconcentration 52%SSWconcentration 99%Variableconcentration 23%Sconcentration 97%Sconcentration 99%SSEconcentration 99%ESEconcentration 72%SSWconcentration 83%Wconcentration 65%NWconcentration 33%NNEconcentration 86%SSEconcentration 61%WSWconcentration 65%WSWconcentration 48%Wconcentration 68%WSWconcentration 48%Variableconcentration 12%Variableconcentration 4%
Mean directional spread (°)172.2199.5161.8163.5146.9146.4167.8220.7210.7198.6228.2211.2171.3190.3113.6195.7151.0180.6144.5153.484.6190.5177.4208.4207.1209.4193.0179.6223.4202.7227.6
Mean wind directionNconcentration 94%WNWconcentration 76%SWconcentration 75%SWconcentration 90%WSWconcentration 96%NWconcentration 92%NWconcentration 98%WSWconcentration 51%SWconcentration 58%SSWconcentration 49%SEconcentration 95%ENEconcentration 70%ENEconcentration 92%Sconcentration 96%SWconcentration 72%WSWconcentration 31%SSEconcentration 87%Sconcentration 95%SEconcentration 89%Econcentration 57%WSWconcentration 30%Wconcentration 79%NNWconcentration 93%NNWconcentration 52%SSWconcentration 92%Wconcentration 82%WSWconcentration 80%Wconcentration 63%WNWconcentration 49%WSWconcentration 74%NNWconcentration 85%
Mean wind speed (mph)12812181316201296969181991213111110141011101210111099
Mean water temperature(°C)13.913.613.513.814.714.514.414.314.414.113.913.713.613.514.214.314.614.715.015.015.114.914.914.515.215.415.415.515.715.516.1

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