M2 wave buoy daily means for May 2025

Daily means from the M2 wave buoy for May 2025, including available wave height, period, direction, wind and sea temperature data.

Last observation shown Sat, May 31, 2025, 23:00

Data available: Thu, May 3, 2001 to Sat, Aug 22, 2026

Monthly means for 2025

Period Summary

Hog Says

727 wave-buoy observations covered all 31 days. Typical wave height was 2.3 ft (10th–90th percentile 0.8–4.6 ft), while mean peak wave period was 4.9 seconds (10th–90th percentile 2.9–7.1 seconds). Typical wind was 11.8 mph (10th–90th percentile 4.4–21 mph) and mean water temperature was 11.4°C (10th–90th percentile 10.3–13°C). 9 of 4,362 checked values (0.2%) were excluded by quality control. Across 13 comparable years, mean wave height was below the same-month mean of 2.8 ft and mean wave period was below the same-month mean of 5.1 seconds.

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

Typical Significant Wave Height

2.3ft

Mean: 2.4 ft

P10–P90: 0.8 — 4.6 ft

Recorded extremes

0.4 — 7.7 ft

Mean Observed Wave Period

4.9secs

P10–P90: 2.9 — 7.1secs

Recorded extremes

2.6 — 25secs

Available for 718 of 727 hourly samples

Typical Observed Wind

Variable, 11.8mph

Mean: 12.3 mph

P10–P90: 4.4 — 21 mph

Recorded extremes

0.7 — 30.9 mph

Circular concentration: 28%

Mean Water Temperature

11.4°C

P10–P90: 10.3 — 13°C

Recorded extremes

9.9 — 14.3°C

Compared With Previous Mays

Historical baseline from 9,548 observations across 13 years.

Wave Height: 2.4ft; 0.4ft below mean; Historical mean 2.789ft
Wave Period: 4.9s; 0.2s below mean; Historical mean 5.1s
Water Temperature: 11.4°C; 1.1°C above mean; Historical mean 10.3°C

Show 10th–90th percentile ranges

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.

M2 wave buoy daily means May 2025Last observation shown May 2025
Metric	May 1	May 2	May 3	May 4	May 5	May 6	May 7	May 8	May 9	May 10	May 11	May 12	May 13	May 14	May 15	May 16	May 17	May 18	May 19	May 20	May 21	May 22	May 23	May 24	May 25	May 26	May 27	May 28	May 29	May 30	May 31
Mean significant wave height (ft)	1	2	3	4	3	1	1	2	1	1	1	2	3	3	2	2	2	2	3	1	1	2	1	3	5	5	3	3	5	3	4
Mean maximum wave height (ft)	2	3	5	6	5	1	2	4	2	1	1	4	4	5	3	3	3	3	4	2	2	4	2	5	9	8	5	5	9	5	7
Mean peak period (s)	6	4	5	5	5	4	4	4	3	8	-	5	4	5	4	4	4	4	4	4	4	4	3	4	5	5	7	7	6	5	5
Mean zero-crossing period (s)	4	3	4	4	4	3	3	3	3	4	4	4	4	4	3	3	3	3	4	4	3	4	3	4	4	4	4	5	5	4	4
Mean peak wave direction	SSEconcentration 42%	NNEconcentration 93%	NNEconcentration 97%	NNEconcentration 92%	NEconcentration 96%	Econcentration 38%	NNEconcentration 81%	NEconcentration 92%	ESEconcentration 39%	SSEconcentration 34%	Sconcentration 60%	Nconcentration 67%	NEconcentration 84%	NEconcentration 92%	NEconcentration 90%	NEconcentration 92%	NEconcentration 91%	ENEconcentration 72%	NEconcentration 86%	ENEconcentration 71%	WNWconcentration 63%	Nconcentration 83%	Variableconcentration 28%	SSWconcentration 87%	Wconcentration 78%	SWconcentration 87%	Sconcentration 89%	Sconcentration 84%	Sconcentration 100%	Sconcentration 99%	Sconcentration 99%
Mean wave direction	SSEconcentration 64%	NNEconcentration 92%	NNEconcentration 97%	NNEconcentration 93%	NEconcentration 97%	Econcentration 57%	NEconcentration 73%	NEconcentration 95%	ESEconcentration 57%	SSEconcentration 50%	SEconcentration 52%	Nconcentration 82%	NEconcentration 94%	ENEconcentration 95%	NEconcentration 92%	NEconcentration 92%	NEconcentration 92%	NEconcentration 90%	ENEconcentration 90%	ENEconcentration 73%	NWconcentration 73%	Nconcentration 82%	Sconcentration 56%	SSWconcentration 93%	WSWconcentration 89%	SWconcentration 94%	SSWconcentration 92%	Sconcentration 88%	Sconcentration 100%	Sconcentration 100%	Sconcentration 99%
Mean directional spread (°)	159.8	182.3	173.7	173.1	198.8	193.4	146.9	178.8	182.2	178.7	150.6	184.3	191.8	183.6	196.0	175.7	176.4	174.8	193.1	210.8	159.0	197.7	219.8	172.4	191.4	166.5	131.2	134.0	132.1	173.6	168.2
Mean wind direction	NNWconcentration 35%	NNEconcentration 97%	Nconcentration 96%	NNEconcentration 92%	NEconcentration 94%	NNEconcentration 83%	NNEconcentration 94%	ENEconcentration 97%	ESEconcentration 71%	Econcentration 70%	NNEconcentration 63%	Nconcentration 79%	NEconcentration 95%	NEconcentration 92%	NEconcentration 96%	NNEconcentration 81%	NNEconcentration 95%	NEconcentration 91%	ENEconcentration 94%	Nconcentration 34%	NWconcentration 62%	NNEconcentration 65%	SSWconcentration 80%	SWconcentration 88%	Wconcentration 97%	SWconcentration 87%	SSWconcentration 43%	SWconcentration 48%	SSWconcentration 96%	SSWconcentration 94%	SSWconcentration 88%
Mean wind speed (mph)	10	12	15	17	13	4	9	12	8	4	7	12	15	15	11	10	11	10	12	3	8	11	10	18	21	23	13	13	22	15	20
Mean water temperature(°C)	10.5	10.3	10.2	10.2	10.2	10.5	10.8	10.7	10.8	10.8	11.0	10.8	10.6	10.7	10.9	11.0	11.1	11.2	11.2	11.4	11.9	12.2	12.8	13.4	13.2	12.7	12.5	12.3	12.2	12.9	13.0

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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.

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