M4 wave buoy daily averages for May 2023 last observation shown Data available: to Monthly averages for
Average Wave Height
8 ft
3.6 — 12.5 ft
Average Wave period
7 secs
4 — 10 secs
Average Water temperature
12 °C
10.9 — 14 °C
Average Wind
WSW, 15 mph
2 — 29 mph
Chart showing grouped wave observations for M4. Use the table on this page for a text version of the same measurements.
About M4 wave buoy
M4 is an offshore data buoy in the Atlantic approaches (55.0000°N, 10.0000°W). It supports marine forecasting by providing real‑time sea‑state and weather observations in open water. It typically reports directional waves and meteorology.
| Day | Wave height (ft) | Wave Period (s) | Wind Direction | Wind Speed (mph) | Water Temp (°C) |
|---|---|---|---|---|---|
| 7 | 7 | NNE | 11 | 11.1 | |
| 6 | 6 | ESE | 13 | 11.2 | |
| 7 | 6 | ESE | 17 | 11.2 | |
| 7 | 5 | E | 22 | 11.2 | |
| 6 | 6 | SE | 15 | 11.2 | |
| 5 | 6 | SSE | 14 | 11.4 | |
| 6 | 5 | SSE | 18 | 11.4 | |
| 6 | 5 | SSW | 16 | 11.4 | |
| 10 | 8 | SSW | 18 | 11.6 | |
| 12 | 7 | WSW | 23 | 11.5 | |
| 10 | 7 | N | 19 | 11.7 | |
| 5 | 6 | WNW | 5 | 12.1 | |
| 8 | 8 | S | 16 | 12.1 | |
| 9 | 7 | WNW | 19 | 11.7 | |
| 9 | 7 | WNW | 15 | 11.7 | |
| 7 | 6 | WNW | 13 | 11.8 | |
| 6 | 6 | SSW | 18 | 11.9 | |
| 8 | 6 | SW | 17 | 12.1 | |
| 10 | 8 | WSW | 14 | 12.2 | |
| 7 | 7 | WSW | 14 | 12.2 | |
| 10 | 8 | N | 10 | 12.3 | |
| 10 | 8 | WNW | 12 | 12.4 | |
| 10 | 8 | W | 17 | 12.4 | |
| 10 | 7 | W | 14 | 12.5 | |
| 11 | 9 | WNW | 11 | 12.8 | |
| 8 | 8 | W | 6 | 13.3 | |
| 6 | 6 | WNW | 13 | 13.3 | |
| 8 | 7 | NE | 12 | 13.2 | |
| 6 | 6 | ENE | 17 | 13.1 | |
| 5 | 5 | ENE | 16 | 13.4 | |
| 5 | 5 | NE | 20 | 13.4 |