M4 wave buoy daily averages for Sep 2025 last observation shown Data available: to Monthly averages for
Average Wave Height
10 ft
4.3 — 16.4 ft
Average Wave period
7 secs
5 — 8 secs
Average Water temperature
14 °C
13.7 — 15.1 °C
Average Wind
SW, 20 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) |
|---|---|---|---|---|---|
| 13 | 7 | W | 22 | 14.8 | |
| 7 | 6 | SW | 15 | 14.8 | |
| 6 | 7 | NW | 11 | 14.9 | |
| 7 | 6 | W | 15 | 15.0 | |
| 9 | 6 | SW | 19 | 14.9 | |
| 9 | 6 | SE | 21 | 14.9 | |
| 12 | 7 | SSW | 23 | 14.9 | |
| 12 | 7 | SSW | 21 | 14.9 | |
| 10 | 7 | SE | 16 | 14.9 | |
| 9 | 6 | SW | 21 | 14.9 | |
| 13 | 7 | W | 26 | 14.7 | |
| 15 | 8 | WSW | 24 | 14.6 | |
| 12 | 7 | WSW | 20 | 14.5 | |
| 9 | 6 | S | 23 | 14.4 | |
| 11 | 7 | W | 24 | 14.4 | |
| 11 | 7 | WSW | 18 | 14.4 | |
| 10 | 5 | S | 31 | 14.4 | |
| 11 | 7 | SSW | 19 | 14.1 | |
| 11 | 7 | SW | 22 | 14.1 | |
| 12 | 7 | N | 24 | 14.1 | |
| 11 | 7 | N | 19 | 14.0 | |
| 7 | 8 | WSW | 8 | 14.1 | |
| 8 | 7 | S | 17 | 14.0 | |
| 10 | 7 | S | 20 | 13.9 | |
| 8 | 6 | S | 21 | 14.0 | |
| 12 | 7 | SSE | 28 | 13.8 | |
| 11 | 8 | WSW | 16 | 13.8 | |
| 7 | 7 | SSW | 9 | 13.9 | |
| 8 | 5 | S | 23 | 14.1 | |
| 10 | 7 | SSW | 18 | 14.1 |