M4 wave buoy daily averages for Oct 2025 last observation shown Data available: to Monthly averages for
Average Wave Height
11 ft
2.3 — 22 ft
Average Wave period
7 secs
4 — 10 secs
Average Water temperature
13 °C
12.8 — 14.3 °C
Average Wind
WSW, 20 mph
2 — 56 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) |
|---|---|---|---|---|---|
| 12 | 7 | SSW | 25 | 14.2 | |
| 10 | 8 | SW | 12 | 14.2 | |
| 11 | 6 | SSW | 31 | 14.1 | |
| 21 | 9 | WNW | 36 | 13.5 | |
| 18 | 8 | WSW | 26 | 13.5 | |
| 14 | 7 | SSW | 31 | 13.5 | |
| 14 | 8 | WSW | 18 | 13.3 | |
| 13 | 8 | WSW | 22 | 13.4 | |
| 13 | 8 | W | 20 | 13.5 | |
| 12 | 8 | WSW | 18 | 13.4 | |
| 7 | 7 | SW | 11 | 13.4 | |
| 5 | 6 | SE | 10 | 13.5 | |
| 4 | 6 | S | 10 | 13.5 | |
| 4 | 8 | ENE | 7 | 13.6 | |
| 4 | 7 | ESE | 9 | 13.9 | |
| 3 | 5 | SSE | 10 | 13.7 | |
| 4 | 4 | SE | 18 | 13.8 | |
| 7 | 5 | SE | 26 | 13.5 | |
| 9 | 7 | SE | 15 | 13.4 | |
| 6 | 7 | WNW | 13 | 13.5 | |
| 10 | 6 | WNW | 23 | 13.5 | |
| 10 | 7 | WNW | 14 | 13.5 | |
| 16 | 8 | WNW | 30 | 13.2 | |
| 15 | 7 | N | 27 | 13.1 | |
| 12 | 7 | NW | 27 | 13.1 | |
| 12 | 7 | WNW | 27 | 13.0 | |
| 16 | 8 | W | 24 | 12.9 | |
| 20 | 8 | W | 33 | 12.9 | |
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