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M4 wave buoy daily averages for Sep 2025 last observation shown oldest observation available Monthly averages for

Average Wave Height

10 ft
4.3 — 26.6 ft

Average Wave period

7 secs
5 — 10 secs

Average Water temperature

14 °C
13.7 — 15.1 °C

Average Wind

SW, 20 mph
2 — 38 mph
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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.

M4 wave buoy daily averages Sep 2025 last observation shown Sep 2025
Day Wave height (ft) Wave Period (s) Wind Direction Wind Speed (mph) Water Temp (°C)
10 7 SSW 18 14.1
8 5 S 23 14.1
7 7 SSW 9 13.9
11 8 WSW 16 13.8
12 7 SSE 28 13.8
8 6 S 21 14.0
10 7 S 20 13.9
8 7 S 17 14.0
7 8 WSW 8 14.1
11 7 N 19 14.0
12 7 N 24 14.1
11 7 SW 22 14.1
13 7 SSW 22 14.1
16 7 SSW 33 14.3
11 7 WSW 18 14.4
16 8 W 29 14.3
9 6 S 23 14.4
12 7 WSW 20 14.5
15 8 WSW 24 14.6
13 7 W 26 14.7
9 6 SW 21 14.9
10 7 SE 16 14.9
12 7 SSW 21 14.9
12 7 SSW 23 14.9
9 6 SE 21 14.9
9 6 SW 19 14.9
7 6 W 15 15.0
6 7 NW 11 14.9
7 6 SW 15 14.8
13 7 W 22 14.8
Realtime data displayed on this page is from the Met Office Marine observations .

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