St Mary's Sound wave buoy monthly averages for 2025 last observation shown Data available: to
Average Wave Height
4 ft
0.1 — 22.1 ft
Average Wave period
5 secs
3 — 9 secs
Average Wave Direction
SSW
Average Water temperature
13 °C
10.4 — 19.4 °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.
| Month | Wave height (ft) | Wave Period (s) | Wave Direction | Water Temp (°C) |
|---|---|---|---|---|
| 7 | 6 | S | 12.2 | |
| 5 | 5 | SW | 13.3 | |
| 4 | 5 | SW | 14.3 | |
| 4 | 5 | SW | 15.4 | |
| 3 | 5 | WSW | 16.8 | |
| 2 | 5 | W | 15.9 | |
| 3 | 5 | WSW | 14.5 | |
| 3 | 4 | SSE | 13.4 | |
| 4 | 5 | SSE | 11.6 | |
| 4 | 5 | SSW | 10.9 | |
| 6 | 5 | S | 10.7 | |
| 6 | 6 | SSW | 11.3 |
Realtime data displayed on this page is from the
Regional Coastal Monitoring Programme
.