St Mary's Sound wave buoy observations on Sat, Aug 15, 2026

Hourly readings from the St Mary's Sound wave buoy for Sat, Aug 15, 2026, including available wave height, period, direction, wind and sea temperature data.

Last observation shown Sat, Aug 15, 2026, 23:30

Oldest observation available Sun, Jul 3, 2016

Daily means for Aug 2026

Period Summary

Hog Says

47 wave-buoy observations were recorded during the day. Typical wave height was 1.8 ft (10th–90th percentile 1.5–2.2 ft), while mean peak wave period was 6.2 seconds (10th–90th percentile 5.2–7.4 seconds). Typical provider-reported wave power was 0.8 kW/m (10th–90th percentile 0.6–1.1 kW/m). Mean water temperature was 17.8°C (10th–90th percentile 17–19.2°C). All 188 checked values passed quality control.

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

About St Mary's Sound wave buoy

St Mary's Sound station lies between St Mary's and St Agnes in the Isles of Scilly. The National Network first deployed a Datawell Directional WaveRider here in May 2014, establishing a nearshore record for an archipelago exposed to Atlantic swell and important to local navigation and coastal management.

Its current data source reports wave height, wave period, wave direction, directional spread, wave power and sea temperature.

St Mary's Sound wave buoy hourly observations Sat, Aug 15, 2026Last observation shown Sat, Aug 15, 2026
Metric	Sat 00:00	Sat 00:30	Sat 01:00	Sat 01:30	Sat 02:00	Sat 02:30	Sat 03:00	Sat 03:30	Sat 04:00	Sat 04:30	Sat 05:00	Sat 05:30	Sat 06:00	Sat 06:30	Sat 07:00	Sat 07:30	Sat 08:00	Sat 08:30	Sat 09:00	Sat 09:30	Sat 10:00	Sat 10:30	Sat 11:00	Sat 11:30	Sat 12:00	Sat 12:30	Sat 13:00	Sat 13:30	Sat 14:00	Sat 14:30	Sat 15:00	Sat 15:30	Sat 16:00	Sat 16:30	Sat 17:00	Sat 17:30	Sat 18:00	Sat 18:30	Sat 19:00	Sat 19:30	Sat 20:00	Sat 20:30	Sat 21:00	Sat 21:30	Sat 22:00	Sat 22:30	Sat 23:00	Sat 23:30
Significant wave height (ft)	2	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	3	3	3	2	2	2	2	2	-	2	2	2	2	2	2	2	2	2	2	2	1	1	1	2	2
Maximum wave height (ft)	2	2	2	2	2	2	3	3	3	3	3	3	3	3	3	3	2	3	3	2	2	3	3	5	5	4	4	3	3	3	3	-	3	3	4	3	2	3	3	3	2	2	3	2	2	2	3	3
Peak period (s)	6	8	9	5	5	6	6	6	6	8	8	6	5	7	7	6	8	8	7	8	5	5	5	5	5	5	5	5	5	5	5	-	6	6	6	6	7	7	6	7	7	6	7	8	8	5	6	5
Zero-crossing period (s)	4	4	4	4	4	4	4	4	4	4	4	4	5	4	4	4	4	4	5	5	5	4	5	5	4	4	4	4	4	4	4	-	4	4	4	5	4	4	4	4	4	5	5	5	5	5	5	5
Energy period (s)	6	6	5	5	5	5	5	5	5	6	6	5	5	6	5	5	5	6	6	6	6	6	6	5	5	5	5	5	5	5	5	-	5	5	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Wave power, kilowatts per metre	0.63	0.48	0.43	0.47	0.52	0.62	0.81	0.76	0.72	0.68	0.67	0.77	1.09	0.83	0.83	0.67	0.7	0.73	0.91	0.85	0.66	0.74	1.43	1.99	1.67	1.48	1.1	0.87	0.98	0.88	0.97	-	0.8	1.16	1.17	1.11	0.71	0.83	0.97	0.75	0.59	0.73	0.71	0.64	0.6	0.59	1.07	1.06
Peak wave direction	W	W	SW	W	WSW	SW	SW	WSW	WSW	W	WNW	NW	NE	NW	WNW	NNW	NW	W	WSW	WSW	E	E	ENE	E	E	ENE	ENE	ENE	ENE	ENE	ENE	-	ENE	ENE	ENE	NE	NW	NW	NNE	NW	NNW	ENE	WSW	WNW	WNW	E	WSW	ENE
Directional spread (°)	50.1	69.4	57.5	58.5	62.9	46.7	30.6	29.4	37.9	55.5	53.2	54.6	50.7	55.4	52.1	64.5	60.2	57.0	45.2	57.3	74.6	61.9	57.2	35.3	48.1	34.5	36.7	35.8	32.8	42.9	35.5	-	46.7	28.3	42.4	37.0	50.5	44.7	48.8	46.0	68.9	56.1	46.7	48.0	58.0	61.0	46.1	65.8
Water temperature(°C)	17.4	17.1	16.5	16.7	17.1	17.5	17.8	18.3	18.2	18.5	19.0	19.3	19.3	19.6	19.5	19.8	20.0	18.5	18.5	18.5	17.7	17.5	17.8	18.0	18.0	18.0	17.5	17.2	17.0	17.2	17.3	-	17.1	17.1	17.0	18.5	18.2	18.0	17.9	17.4	16.9	17.1	17.0	17.1	16.8	17.0	17.1	17.6

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The observation data displayed on this page is from the Regional Coastal Monitoring Programme.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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