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Anglesey (Ynys Môn) Seasonal Surf Averages

Based on the last ten years data for this location this page gives seasonal trends and an idea of what kind of conditions you can expect and when. Of course these are just averages - it's worth reading carefully to understand exactly what they mean and to recognise the kind of variation you could expect on a trip because an average can never tell the whole story. Click on a month below to see more detail.
If you want a past forecast for a specific date range then click here.

Local Photo


Swell Consistency and Wind Overview

Wind Swell Ground Swell
51%
23%

28%

Jan
43%
22%

21%

Feb
36%
22%

14%

Mar
25%
8%

17%

Apr
22%
3%

19%

May
16%
2%

14%

Jun
6%
 
6%

Jul
6%
 
6%

Aug
22%
6%

16%

Sep
31%
7%

24%

Oct
35%
13%

22%

Nov
41%
20%

21%

Dec
This graph shows the percentage of days that had a ridable wind swell (7 seconds period or more) or groundswell (10 seconds period or more) of over 3ft. It also shows the dominant wind direction. Not all of these days will neccessarily give great surf, and very short lived wind swells or longer period secondary swells may produce surf not recorded, but it gives a clear idea of the seasonal trend and a rough guide to the chances of scoring something ridable.

Monthly Overview

Jan
Swell
Consistency
51%
Average Swell
Height
7ft
Average Swell
Period
11s
Dominant Wind
Dominant Swell
Feb
Swell
Consistency
43%
Average Swell
Height
7ft
Average Swell
Period
11s
Dominant Wind
Dominant Swell
Mar
Swell
Consistency
36%
Average Swell
Height
5ft
Average Swell
Period
11s
Dominant Wind
Dominant Swell
Apr
Swell
Consistency
25%
Average Swell
Height
4ft
Average Swell
Period
10s
Dominant Wind
Dominant Swell
May
Swell
Consistency
22%
Average Swell
Height
3ft
Average Swell
Period
9s
Dominant Wind
Dominant Swell
Jun
Swell
Consistency
16%
Average Swell
Height
3ft
Average Swell
Period
9s
Dominant Wind
Dominant Swell
Jul
Swell
Consistency
6%
Average Swell
Height
2ft
Average Swell
Period
8s
Dominant Wind
Dominant Swell
Aug
Swell
Consistency
6%
Average Swell
Height
2ft
Average Swell
Period
8s
Dominant Wind
Dominant Swell
Sep
Swell
Consistency
22%
Average Swell
Height
4ft
Average Swell
Period
9s
Dominant Wind
Dominant Swell
Oct
Swell
Consistency
31%
Average Swell
Height
6ft
Average Swell
Period
9s
Dominant Wind
Dominant Swell
Nov
Swell
Consistency
35%
Average Swell
Height
6ft
Average Swell
Period
10s
Dominant Wind
Dominant Swell
Dec
Swell
Consistency
41%
Average Swell
Height
7ft
Average Swell
Period
10s
Dominant Wind
Dominant Swell

Understanding this Data

These swell averages are calculated ONLY on swells of more than 7 seconds period. This means this is the average height of a swell that's likely to produce ridable surf NOT an average of every wave heading toward the beach in a month. Likewise the period is the average period OVER 7 seconds. There will be days that have short period wind swells that won't produce and ridable swell and these are excluded from the averages. The consistency figure gives the percentage of days that meet this condition.

For example if the consistency is 50% you could expect the 'average' swell for about 15 days in the month. Of course an average tells only part of the story. A combination of very large and very small swells may produce the same average as a consistent medium sized swell.

Monthly Data

January
February
March
April
May
June
July
August
September
October
November
December

Nearby Spots

Aberdaron
Harlech to Barmouth
Barmouth
Tywyn to Aberdovey
Borth / Ynyslas
The edge
The Point
Barrel Rock
drivers
Isle of Man
S*** Pipe
Llangrannog
Abereiddy
Newgale
Whitesands Bay
Dublin Area
Tenby South Beach
Manorbier
Llangennith / Rhossili
Silecroft
Freshwater West
Hunts Bay
Langland Bay
Newcastle
Aberavon
Clogherhead
Porthcawl - Rest Bay
Porthcawl - Coney Beach
Woolacombe
Putsborough
Croyde Beach
Saunton Sands
Westward Ho!
Sandymouth
Bude - Summerleaze
Bude - Crooklets
Widemouth Bay
Dunaverty
Crackington Haven
Machrihanish
Westport
Polzeath
Graveyards
Caravans
Harlyn
Constantine
Treyarnon
Mawgan Porth
Tramore - Incredible Wave
Watergate Bay
Tramore - Strand
Whipsiderry
Newquay - Porth
Lusty Glaze
Newquay - Cribbar
Newquay- Little Fistral
Newquay - Tolcarne Wedge
Newquay - Towan / Great Western
Exmouth
Newquay - Fistral North
Newquay - Fistral South
Crantock
Sidmouth (Lyme Bay)
Teignmouth
Holywell Bay
Whitsand Bay
Penhale (Perran Sands)
Perranporth (Droskyn)
Wembury
The Perfect Wave