M4 wave buoy daily averages for Aug 2025 last observation shown Data available: to Monthly averages for
Average Wave Height
8 ft
2.3 — 19.4 ft
Average Wave period
6 secs
4 — 10 secs
Average Water temperature
16 °C
14.5 — 17.5 °C
Average Wind
S, 15 mph
2 — 36 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) |
|---|---|---|---|---|---|
| 5 | 6 | NW | 12 | 15.5 | |
| - | - | - | - | - | |
| - | - | - | - | - | |
| - | - | - | - | - | |
| 13 | 7 | W | 20 | 14.6 | |
| 10 | 6 | SSW | 22 | 14.8 | |
| 11 | 7 | WSW | 22 | 14.8 | |
| 13 | 7 | SW | 27 | 14.7 | |
| 14 | 8 | WSW | 20 | 14.7 | |
| 8 | 6 | SSW | 15 | 14.7 | |
| 6 | 7 | S | 9 | 14.8 | |
| 5 | 7 | NE | 5 | 15.3 | |
| 4 | 6 | N | 8 | 15.3 | |
| 4 | 7 | SE | 4 | 15.4 | |
| 4 | 7 | ENE | 6 | 15.7 | |
| 4 | 4 | ENE | 17 | 15.9 | |
| 3 | 5 | E | 10 | 15.7 | |
| 3 | 4 | ENE | 9 | 16.2 | |
| 3 | 5 | NE | 8 | 16.6 | |
| 3 | 5 | ESE | 5 | 16.8 | |
| 3 | 6 | W | 6 | 16.9 | |
| 5 | 7 | S | 10 | 16.9 | |
| 4 | 6 | S | 12 | 16.8 | |
| 6 | 5 | SSE | 13 | 16.7 | |
| 9 | 6 | SSE | 22 | 16.4 | |
| 17 | 9 | S | 17 | 15.7 | |
| 14 | 8 | SSW | 21 | 15.6 | |
| 15 | 8 | WSW | 23 | 15.3 | |
| 9 | 6 | W | 18 | 15.2 | |
| 9 | 6 | S | 22 | 15.2 | |
| 16 | 8 | SW | 27 | 14.9 |