M4 wave buoy daily averages for Jan 2025 last observation shown Data available: to Monthly averages for
Average Wave Height
12 ft
6.6 — 18.4 ft
Average Wave period
7 secs
5 — 10 secs
Average Water temperature
11 °C
10.5 — 11.3 °C
Average Wind
SW, 21 mph
2 — 38 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) |
|---|---|---|---|---|---|
| 16 | 8 | N | 21 | 11.1 | |
| 10 | 7 | N | 18 | 11.1 | |
| 10 | 7 | WNW | 16 | 11.1 | |
| 9 | 8 | SSW | 12 | 11.0 | |
| 8 | 7 | NE | 18 | 11.1 | |
| 16 | 7 | N | 30 | 11.1 | |
| 15 | 8 | NNW | 23 | 11.0 | |
| 12 | 8 | N | 16 | 10.9 | |
| 9 | 7 | NE | 15 | 10.9 | |
| 10 | 6 | ESE | 25 | 10.9 | |
| 10 | 8 | SW | 12 | 11.0 | |
| 10 | 6 | S | 25 | 11.0 | |
| 13 | 7 | SW | 22 | 11.0 | |
| 12 | 7 | SSW | 22 | 11.0 | |
| 14 | 8 | SSW | 25 | 11.0 | |
| 15 | 8 | S | 28 | 11.1 | |
| 14 | 7 | SSW | 27 | 11.1 | |
| 13 | 7 | S | 24 | 11.1 | |
| 13 | 8 | S | 18 | 11.1 | |
| 11 | 8 | WSW | 15 | 11.0 | |
| 8 | 7 | W | 14 | 11.0 | |
| 8 | 7 | WNW | 10 | 10.9 | |
| 11 | 6 | SW | 25 | 10.9 | |
| 16 | 7 | SE | 32 | 10.9 | |
| 15 | 8 | SW | 23 | 10.7 | |
| 13 | 8 | ESE | 25 | 10.8 | |
| 14 | 8 | ENE | 26 | 10.8 | |
| 13 | 7 | NNW | 21 | 10.7 | |
| 10 | 7 | NNW | 20 | 10.7 | |
| 11 | 7 | WSW | 22 | 10.5 | |
| 13 | 8 | WSW | 19 | 10.6 |