St Mary's Sound wave buoy daily averages for Mar 2026 last observation shown Data available: to Monthly averages for
Average Wave Height
5 ft
2.2 — 12.8 ft
Average Wave period
5 secs
4 — 8 secs
Average Wave Direction
WSW
Average Water temperature
11 °C
10.9 — 11.4 °C
About St Mary's Sound wave buoy
St Mary's Sound (CCO station 113) is an inshore coastal wave monitoring site at 49.8912°N, 6.3125°W. It’s part of the UK’s regional Coastal Monitoring / Channel Coastal Observatory network, placed to characterise nearshore wave climate for flood risk, erosion studies, coastal engineering and local forecasting. These stations commonly use a directional wave buoy (often a Datawell Directional WaveRider class) and report significant wave height, wave period (peak/mean) and wave direction; many also report sea temperature and, where fitted, nearby meteorology.
| Day | Wave height (ft) | Wave Period (s) | Wave Direction | Water Temp (°C) |
|---|---|---|---|---|
| 4 | 5 | WSW | 11.0 | |
| 4 | 6 | W | 11.0 | |
| 7 | 6 | SW | 11.1 | |
| 8 | 6 | SW | 11.1 | |
| 5 | 5 | W | 11.1 | |
| 5 | 5 | SW | 11.1 | |
| 3 | 6 | WSW | 11.1 | |
| 3 | 6 | W | 11.1 | |
| 3 | 6 | W | 11.1 | |
| 4 | 6 | NNE | 11.0 | |
| 3 | 4 | W | 11.1 | |
| 3 | 4 | SW | 11.2 | |
| 4 | 5 | SW | 11.1 | |
| 8 | 6 | SSW | 11.1 | |
| 8 | 6 | SW | 11.0 |
Realtime data displayed on this page is from the
Regional Coastal Monitoring Programme
.