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M4 wave buoy daily averages for Aug 2025 last observation shown Data available:  to  Monthly averages for

Average Wave Height

8 ft
2.3 — 19.4 ft

Average Wave period

6 secs
4 — 10 secs

Average Water temperature

16 °C
14.5 — 17.5 °C

Average Wind

S, 15 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.

M4 wave buoy daily averages Aug 2025 last observation shown
Day Wave height (ft) Wave Period (s) Wind Direction Wind Speed (mph) Water Temp (°C)
5 6 NW 12 15.5
- - - - -
- - - - -
- - - - -
13 7 W 20 14.6
10 6 SSW 22 14.8
11 7 WSW 22 14.8
13 7 SW 27 14.7
14 8 WSW 20 14.7
8 6 SSW 15 14.7
6 7 S 9 14.8
5 7 NE 5 15.3
4 6 N 8 15.3
4 7 SE 4 15.4
4 7 ENE 6 15.7
4 4 ENE 17 15.9
3 5 E 10 15.7
3 4 ENE 9 16.2
3 5 NE 8 16.6
3 5 ESE 5 16.8
3 6 W 6 16.9
5 7 S 10 16.9
4 6 S 12 16.8
6 5 SSE 13 16.7
9 6 SSE 22 16.4
17 9 S 17 15.7
14 8 SSW 21 15.6
15 8 WSW 23 15.3
9 6 W 18 15.2
9 6 S 22 15.2
16 8 SW 27 14.9

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