St Mary's Sound wave
buoy daily averages for Sep 2025 last observation shown
oldest observation available
Monthly averages for 
Average Wave Height
5 ft
2.7 — 10.2 ft
Average Wave period
5 secs
4 — 7 secs
Average Wave Direction
SW
Average Water temperature
16 °C
14.7 — 17.7 °C
| Day | Wave height (ft) | Wave Period (s) | Wave Direction | Water Temp (°C) |
|---|---|---|---|---|
| 5.8 | 5.2 | SW | 15.1 | |
| 4.3 | 5.3 | WSW | 14.9 | |
| 4.4 | 5.2 | WSW | 14.9 | |
| 4.6 | 5.3 | W | 14.9 | |
| 4.5 | 5.3 | SW | 15.0 | |
| 5.8 | 5.1 | SSW | 15.3 | |
| 4.3 | 5.5 | SW | 15.6 | |
| 6.6 | 6.1 | SSW | 15.6 | |
| 5.2 | 4.5 | S | 16.6 | |
| 3.3 | 5 | WSW | 16.8 | |
| 5.9 | 6.1 | SW | 16.7 | |
| 7.2 | 6.3 | SSW | 16.7 | |
| 4.9 | 5.2 | SW | 16.9 | |
| 4.5 | 5.1 | W | 16.4 |
Realtime data displayed on this page is from the Regional
Coastal Monitoring Programme.