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M3 wave buoy daily averages for Dec 2025 last observation shown Data available:  to  Monthly averages for

Average Wave Height

16 ft
4.9 — 35.8 ft

Average Wave period

8 secs
5 — 14 secs

Average Water temperature

12 °C
11.4 — 12.6 °C

Average Wind

SW, 20 mph
0 — 40 mph

Chart showing grouped wave observations for M3. Use the table on this page for a text version of the same measurements.

About M3 wave buoy

M3 is an offshore data buoy in the Atlantic approaches (51.1300°N, 10.3300°W). It provides upstream observations of swell and storm conditions relevant to Ireland/UK marine forecasts. It typically measures wave height/period/direction plus basic meteorological variables.

M3 wave buoy daily averages Dec 2025 last observation shown
Day Wave height (ft) Wave Period (s) Wind Direction Wind Speed (mph) Water Temp (°C)
13 7 WSW 17 12.5
21 10 W 17 12.5
17 9 W 21 12.4
20 9 W 21 12.4
20 9 SW 28 12.3
27 10 WSW 24 11.9
12 8 WSW 17 11.8
18 9 SSW 21 12.0
22 9 SW 28 12.0
19 8 SW 24 12.0
22 9 SW 21 12.0
25 11 WSW 18 12.1
19 9 SSW 26 12.2
17 8 SW 24 12.2
15 9 W 11 12.2
15 9 WSW 16 12.2
17 8 SW 24 12.5
28 12 WSW 23 12.4
23 10 SW 23 12.4
16 8 SW 20 12.3
20 11 NE 11 11.9
12 8 N 17 11.8
10 7 NE 16 11.9
10 7 ENE 18 12.1
10 6 ENE 22 12.1
8 6 ENE 21 11.6
8 5 ENE 20 11.7
8 6 E 18 11.5
6 5 ENE 16 11.6
7 5 E 20 11.7
6 5 ESE 15 11.8

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