St Mary's Sound wave buoy daily averages for Aug 2016 last observation shown oldest observation available Monthly averages for
Average Wave Height
 3 ft 
 1 — 12 ft
   Average Wave period
 8 secs 
 3 — 17 secs
   Average Wave Direction
 W 
  Average Water temperature
 16 °C 
 13.7 — 18.2 °C
   | Day | Wave height (ft) | Wave Period (s) | Wave Direction | Water Temp (°C) | 
|---|---|---|---|---|
| 2.2 | 10.1 | NW | 15.1 | |
| 1.5 | 7.1 | SW | 15.2 | |
| 2.2 | 7.4 | SW | 15.3 | |
| 4.7 | 8.5 | SW | 15.3 | |
| 1.7 | 5.4 | SSE | 16.1 | |
| 1.3 | 8 | NW | 15.8 | |
| 1.6 | 9.8 | NNW | 15.3 | |
| 2.0 | 9.5 | NW | 15.0 | |
| 2.6 | 8.3 | WSW | 14.7 | |
| 3.5 | 7 | WSW | 14.9 | |
| 3.7 | 7.4 | WSW | 15.0 | |
| 6.2 | 9.2 | WSW | 14.2 | |
| 8.3 | 8.1 | SSW | 14.5 | |
| 2.4 | 7.4 | WSW | 15.0 | |
| 3.0 | 8 | N | 15.2 | |
| 3.6 | 5.2 | ESE | 16.1 | |
| 3.2 | 6.2 | ESE | 16.8 | |
| 1.3 | 8 | NW | 17.5 | |
| 1.6 | 7.9 | NW | 17.3 | |
| 1.3 | 6.6 | NW | 17.2 | |
| 1.8 | 6.5 | NW | 16.4 | |
| 1.6 | 6.6 | NW | 16.4 | |
| 2.0 | 9.4 | NW | 16.2 | |
| 2.7 | 11.5 | NW | 15.5 | |
| 2.7 | 9.3 | SW | 15.0 | |
| 2.2 | 6.3 | SW | 15.5 | |
| 2.2 | 8.6 | W | 15.6 | |
| 3.2 | 9.2 | WNW | 15.1 | |
| 4.1 | 7.5 | WSW | 15.0 | |
| 4.5 | 7.5 | WSW | 14.7 | |
| 3.6 | 6.7 | WSW | 15.0 | 
 Realtime data displayed on this page is from the Regional
                Coastal Monitoring Programme.