M4 wave buoy daily averages for Jul 2025 last observation shown Data available: to Monthly averages for
Average Wave Height
6 ft
2.6 — 8.9 ft
Average Wave period
5 secs
4 — 7 secs
Average Water temperature
15 °C
13.6 — 15.9 °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) |
|---|---|---|---|---|---|
| 6 | 6 | W | 9 | 14.0 | |
| 4 | 5 | WSW | 13 | 14.1 | |
| 6 | 5 | SW | 22 | 14.0 | |
| 9 | 6 | SW | 24 | 13.8 | |
| 9 | 6 | WNW | 18 | 13.7 | |
| 8 | 6 | NW | 18 | 13.8 | |
| 6 | 5 | WNW | 16 | 13.9 | |
| 5 | 5 | WSW | 14 | 14.0 | |
| 6 | 5 | WSW | 16 | 14.1 | |
| 7 | 6 | SSW | 18 | 14.1 | |
| 6 | 6 | S | 15 | 14.3 | |
| 5 | 6 | ESE | 10 | 14.6 | |
| 5 | 6 | E | 11 | 15.0 | |
| 4 | 5 | SSE | 12 | 15.1 | |
| 7 | 6 | N | 12 | 15.1 | |
| 4 | 5 | SSE | 9 | 15.2 | |
| 5 | 5 | S | 17 | 15.2 | |
| 6 | 6 | SW | 13 | 15.5 | |
| 4 | 5 | ENE | 10 | 15.7 | |
| 5 | 5 | N | 16 | 15.5 | |
| 7 | 5 | NW | 19 | 15.3 | |
| 5 | 5 | W | 13 | 15.5 | |
| 5 | 6 | NW | 12 | 15.5 | |
| 5 | 5 | SW | 14 | 15.5 | |
| 6 | 5 | WSW | 17 | 15.6 | |
| - | - | - | - | - | |
| 8 | 6 | W | 15 | 15.4 | |
| 6 | 6 | WSW | 12 | 15.5 | |
| 5 | 5 | W | 14 | 15.5 | |
| 6 | 6 | W | 13 | 15.6 | |
| 6 | 6 | NW | 14 | 15.6 |