M4 wave buoy daily averages for Nov 2025 last observation shown oldest observation available Monthly averages for
Average Wave Height
20 ft
9.5 — 41 ft
Average Wave period
9 secs
6 — 12 secs
Average Water temperature
12 °C
11.5 — 11.8 °C
Average Wind
WNW, 29 mph
9 — 47 mph
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) |
|---|---|---|---|---|---|
| 11 | 7 | N | 21 | 11.6 | |
| 15 | 9 | NNW | 18 | 11.7 | |
| 27 | 10 | WSW | 33 | 11.8 | |
| 27 | 9 | SW | 44 | 11.8 |
Realtime data displayed on this page is from the
Met Office Marine observations
.