M4 wave buoy daily averages for Sep 2023 last observation shown Data available: to Monthly averages for
Average Wave Height
9 ft
2.6 — 19.7 ft
Average Wave period
7 secs
4 — 10 secs
Average Water temperature
15 °C
13.9 — 16.6 °C
Average Wind
SW, 16 mph
0 — 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) |
|---|---|---|---|---|---|
| 7 | 8 | ENE | 5 | 15.5 | |
| 5 | 6 | SSW | 12 | 15.5 | |
| 12 | 8 | SSW | 18 | 15.4 | |
| 13 | 9 | S | 10 | 15.5 | |
| 10 | 9 | ENE | 13 | 15.6 | |
| 5 | 6 | SE | 9 | 15.7 | |
| 4 | 5 | SE | 9 | 15.9 | |
| 4 | 7 | S | 9 | 16.3 | |
| 6 | 6 | SW | 12 | 16.3 | |
| 8 | 8 | SSW | 9 | 16.4 | |
| 6 | 6 | NW | 13 | 16.3 | |
| 5 | 6 | NNW | 7 | 16.3 | |
| 9 | 6 | SSW | 19 | 16.1 | |
| 9 | 6 | W | 14 | 15.4 | |
| 6 | 6 | NNW | 10 | 15.4 | |
| 6 | 6 | NE | 15 | 15.4 | |
| 4 | 6 | NE | 9 | 15.3 | |
| 11 | 7 | W | 18 | 15.0 | |
| 15 | 8 | WSW | 20 | 14.8 | |
| 13 | 7 | W | 22 | 14.9 | |
| 12 | 8 | WNW | 21 | 14.8 | |
| 15 | 8 | NNW | 22 | 14.8 | |
| 10 | 7 | SE | 21 | 14.7 | |
| 13 | 8 | SSW | 21 | 14.4 | |
| 17 | 8 | SSW | 30 | 14.4 | |
| 12 | 7 | SW | 21 | 14.4 | |
| 9 | 7 | SSE | 22 | 14.3 | |
| 13 | 7 | SW | 29 | 14.2 | |
| 14 | 8 | W | 22 | 14.1 | |
| 8 | 7 | S | 20 | 14.1 |