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Rossnowlagh 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
93%
80%

13%

Jan
93%
76%

17%

Feb
88%
65%

23%

Mar
85%
48%

37%

Apr
77%
25%

52%

May
70%
12%

58%

Jun
66%
9%

57%

Jul
67%
9%

58%

Aug
78%
33%

45%

Sep
85%
48%

37%

Oct
92%
60%

32%

Nov
89%
73%

16%

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
93%
Average Swell
Height
13ft
Average Swell
Period
12s
Dominant Wind
Dominant Swell
Feb
Swell
Consistency
93%
Average Swell
Height
13ft
Average Swell
Period
12s
Dominant Wind
Dominant Swell
Mar
Swell
Consistency
88%
Average Swell
Height
10ft
Average Swell
Period
11s
Dominant Wind
Dominant Swell
Apr
Swell
Consistency
85%
Average Swell
Height
8ft
Average Swell
Period
10s
Dominant Wind
Dominant Swell
May
Swell
Consistency
77%
Average Swell
Height
7ft
Average Swell
Period
9s
Dominant Wind
Dominant Swell
Jun
Swell
Consistency
70%
Average Swell
Height
6ft
Average Swell
Period
9s
Dominant Wind
Dominant Swell
Jul
Swell
Consistency
66%
Average Swell
Height
6ft
Average Swell
Period
9s
Dominant Wind
Dominant Swell
Aug
Swell
Consistency
67%
Average Swell
Height
6ft
Average Swell
Period
9s
Dominant Wind
Dominant Swell
Sep
Swell
Consistency
78%
Average Swell
Height
7ft
Average Swell
Period
10s
Dominant Wind
Dominant Swell
Oct
Swell
Consistency
85%
Average Swell
Height
9ft
Average Swell
Period
10s
Dominant Wind
Dominant Swell
Nov
Swell
Consistency
92%
Average Swell
Height
11ft
Average Swell
Period
11s
Dominant Wind
Dominant Swell
Dec
Swell
Consistency
89%
Average Swell
Height
12ft
Average Swell
Period
12s
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

Strandhill
Enniscrone
North Malin
Bertra Beach (Murrisk)
Portrush
Carrowniskey
Achill Island
Lahinch - Cornish Left
Islay (Machir Bay)
Port Bharrapol (Tiree)
Tramore - Strand
Machrihanish
Dublin Area
Brandon Bay
Inch Reefs
Hosta
Scarasta
Isle of Man
Mangersta
Anglesey
Whitesands Bay
Hells Mouth
Newgale
Freshwater West
Eoropie
Manorbier
Barmouth
Tenby South Beach
Tywyn to Aberdovey
Borth / Ynyslas
Llangennith / Rhossili
Sennen
Constantine
Harlyn
Langland Bay
Gwithian
Polzeath
Newquay - Fistral North
Mawgan Porth
Watergate Bay
Newquay - Towan / Great Western
Lusty Glaze
Sandymouth
Porthtowan
Perranporth (Droskyn)
Bude - Crooklets
Croyde Beach
Widemouth Bay
Putsborough
Praa Sands
Durness (Balnakeil Bay)
Aberavon
Falmouth
Porthcawl - Coney Beach
Wave Buoy 64045
St Andrews East
Whitsand Bay
Belhaven Bay (Dunbar)
Lossiemouth
Pease Bay
Bantham
Lunan Bay
Brimms Ness - The Point
Teignmouth
Wave Buoy 62081
Thurso East
Exmouth
Sandend (Moray Firth)
Sidmouth (Lyme Bay)
Sinclairs Bay - Beach