M2 wave buoy daily means for Sep 2021

Daily means from the M2 wave buoy for Sep 2021, including available wave height, period, direction, wind and sea temperature data.

Last observation shown Thu, Sep 30, 2021, 23:00

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

Monthly means for 2021

Period Summary

Hog Says

716 wave-buoy observations covered all 30 days. Typical wave height was 1.5 ft (10th–90th percentile 1–4.6 ft), while mean peak wave period was 4.9 seconds (10th–90th percentile 3–7.5 seconds). Typical wind was 10.5 mph (10th–90th percentile 4.7–20.6 mph) and mean water temperature was 15.5°C (10th–90th percentile 15.1–15.9°C). 7 of 4,296 checked values (0.2%) were excluded by quality control. Across 10 comparable years, mean wave height was below the same-month mean of 3.4 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

1.5ft

Mean: 2.2 ft

P10–P90: 1 — 4.6 ft

Recorded extremes

0.5 — 9.7 ft

Available for 715 of 716 hourly samples

Mean Observed Wave Period

4.9secs

P10–P90: 3 — 7.5secs

Recorded extremes

2.1 — 10secs

Available for 710 of 716 hourly samples

Typical Observed Wind

SSW, 10.5mph

Mean: 11.4 mph

P10–P90: 4.7 — 20.6 mph

Recorded extremes

0.2 — 33.1 mph

Circular concentration: 31%

Mean Water Temperature

15.5°C

P10–P90: 15.1 — 15.9°C

Recorded extremes

14.7 — 16.7°C

Compared With Previous Septembers

Historical baseline from 6,356 observations across 10 years.

Wave Height: 2.2ft; 1.2ft below mean; Historical mean 3.445ft
Wave Period: 4.9s; 0.2s below mean; Historical mean 5.1s
Water Temperature: 15.5°C; 1°C above mean; Historical mean 14.5°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 Sep 2021Last observation shown Sep 2021
Metric	Sep 1	Sep 2	Sep 3	Sep 4	Sep 5	Sep 6	Sep 7	Sep 8	Sep 9	Sep 10	Sep 11	Sep 12	Sep 13	Sep 14	Sep 15	Sep 16	Sep 17	Sep 18	Sep 19	Sep 20	Sep 21	Sep 22	Sep 23	Sep 24	Sep 25	Sep 26	Sep 27	Sep 28	Sep 29	Sep 30
Mean significant wave height (ft)	2	2	2	2	1	1	1	1	1	1	2	2	2	1	1	2	QC rejected	2	2	1	1	2	3	2	2	5	4	4	4	7
Mean maximum wave height (ft)	3	3	3	2	2	1	0	1	0	0	2	2	2	2	0	3	7	2	2	2	2	3	4	3	2	7	5	6	6	10
Mean peak period (s)	4	4	4	4	4	6	7	5	6	6	4	4	4	5	6	4	6	7	4	4	3	4	5	4	5	5	5	7	5	7
Mean zero-crossing period (s)	3	3	3	3	3	3	5	3	4	4	3	3	3	4	4	3	4	4	3	3	3	3	4	3	3	4	4	4	4	5
Mean peak wave direction	ENEconcentration 97%	ENEconcentration 96%	ENEconcentration 93%	Econcentration 80%	SEconcentration 55%	Sconcentration 90%	Sconcentration 99%	Econcentration 46%	SSEconcentration 74%	SSEconcentration 79%	Wconcentration 50%	NNEconcentration 72%	Econcentration 90%	ESEconcentration 62%	SSEconcentration 48%	SWconcentration 71%	Sconcentration 99%	Sconcentration 98%	SSWconcentration 67%	WSWconcentration 63%	WSWconcentration 34%	SSWconcentration 70%	SWconcentration 50%	WSWconcentration 84%	SSWconcentration 52%	Sconcentration 99%	SSWconcentration 83%	Sconcentration 92%	Wconcentration 96%	Sconcentration 99%
Mean wave direction	ENEconcentration 98%	ENEconcentration 98%	ENEconcentration 95%	Econcentration 91%	SEconcentration 77%	Sconcentration 98%	SSEconcentration 96%	Econcentration 87%	SSEconcentration 91%	Sconcentration 96%	WSWconcentration 65%	NNEconcentration 81%	Econcentration 96%	SEconcentration 93%	SEconcentration 87%	SWconcentration 72%	Sconcentration 99%	Sconcentration 97%	SSWconcentration 82%	SWconcentration 88%	SWconcentration 71%	SSWconcentration 83%	WSWconcentration 83%	SWconcentration 93%	SSWconcentration 85%	Sconcentration 99%	SSWconcentration 95%	Sconcentration 95%	Wconcentration 95%	Sconcentration 100%
Mean directional spread (°)	29.4	28.4	27.8	30.7	39.6	35.7	31.2	37.7	39.4	36.6	31.8	36.8	29.1	38.2	34.5	26.2	22.9	30.8	31.9	33.0	34.3	25.6	37.0	39.0	43.1	21.5	25.7	22.7	29.9	18.9
Mean wind direction	ENEconcentration 91%	ENEconcentration 91%	ENEconcentration 92%	ESEconcentration 88%	SSEconcentration 90%	Sconcentration 96%	Econcentration 87%	Econcentration 62%	SSEconcentration 94%	SSWconcentration 74%	WSWconcentration 81%	NEconcentration 96%	SEconcentration 85%	ESEconcentration 74%	SSEconcentration 39%	SWconcentration 66%	Sconcentration 68%	Variableconcentration 29%	WSWconcentration 75%	Wconcentration 81%	WSWconcentration 75%	SWconcentration 92%	WSWconcentration 80%	WSWconcentration 95%	SSWconcentration 68%	SSWconcentration 80%	WSWconcentration 92%	SWconcentration 90%	Wconcentration 92%	SSWconcentration 96%
Mean wind speed (mph)	11	13	12	7	9	9	7	6	8	7	10	10	11	5	5	14	16	5	11	10	9	15	15	12	11	20	18	17	19	23
Mean water temperature(°C)	15.2	15.3	15.2	15.3	15.5	15.8	15.8	15.4	15.5	15.5	15.6	15.5	15.5	15.7	15.7	15.7	15.8	15.9	16.0	15.9	15.7	15.7	15.6	15.6	15.6	15.4	15.3	15.2	15.0	15.1

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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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