M4 wave buoy daily averages for Nov 2025 last observation shown Data available: to Monthly averages for
Average Wave Height
19 ft
9.5 — 35.8 ft
Average Wave period
9 secs
6 — 11 secs
Average Water temperature
12 °C
11.5 — 11.8 °C
Average Wind
WNW, 29 mph
9 — 47 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.
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| 23 | 9 | SW | 44 | 11.8 | |
| 26 | 10 | WSW | 33 | 11.8 | |
| 15 | 9 | NNW | 18 | 11.7 | |
| 11 | 7 | N | 21 | 11.6 |