M4 wave buoy monthly averages for 2026 last observation shown Data available: to
Average Wave Height
12 ft
6.9 — 17.7 ft
Average Wave period
8 secs
6 — 9 secs
Average Water temperature
11 °C
10.4 — 11.3 °C
Average Wind
NNW, 23 mph
12 — 33 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.
| Month | Wave height (ft) | Wave Period (s) | Wind Direction | Wind Speed (mph) | Water Temp (°C) |
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| 12 | 8 | NNW | 23 | 10.8 | |
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