M4 wave buoy daily averages for Mar 2025 last observation shown Data available: to Monthly averages for
Average Wave Height
10 ft
3.6 — 21.7 ft
Average Wave period
7 secs
4 — 12 secs
Average Water temperature
11 °C
10 — 11.2 °C
Average Wind
SW, 19 mph
2 — 40 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) |
|---|---|---|---|---|---|
| 18 | 11 | W | 14 | 11.0 | |
| 17 | 9 | SW | 24 | 11.0 | |
| 17 | 10 | WSW | 17 | 11.0 | |
| 17 | 8 | SW | 31 | 11.1 | |
| 18 | 8 | SSW | 30 | 11.1 | |
| 17 | 8 | SSW | 26 | 11.0 | |
| 10 | 8 | SE | 15 | 11.0 | |
| 7 | 7 | ESE | 16 | 10.9 | |
| 7 | 7 | NE | 13 | 11.1 | |
| 14 | 8 | NE | 26 | 11.1 | |
| 8 | 6 | NNE | 18 | 11.1 | |
| 9 | 6 | NNE | 21 | 11.0 | |
| 6 | 6 | NNW | 14 | 11.0 | |
| 7 | 6 | NE | 18 | 11.0 | |
| 5 | 7 | N | 7 | 10.9 | |
| 4 | 7 | E | 9 | 10.5 | |
| 5 | 5 | SE | 20 | 10.3 | |
| 7 | 6 | SE | 20 | 10.5 | |
| 5 | 6 | SE | 13 | 10.8 | |
| 4 | 5 | SE | 18 | 11.1 | |
| 7 | 5 | SSE | 18 | 11.1 | |
| 13 | 7 | NNW | 24 | 11.1 | |
| 9 | 7 | NNW | 18 | 10.7 | |
| 7 | 6 | WSW | 18 | 10.4 | |
| 6 | 6 | W | 12 | 10.7 | |
| 9 | 6 | SSW | 22 | 10.9 | |
| 11 | 7 | WSW | 22 | 10.8 | |
| 18 | 8 | WNW | 26 | 10.7 | |
| 16 | 8 | WSW | 26 | 10.7 | |
| 14 | 8 | WSW | 17 | 10.8 | |
| 11 | 8 | S | 16 | 10.9 |