Kilcummin Harbour Surf Break

Lat Long: 54.28° N 9.22° W

Kilcummin Harbour Surf Forecast and Surf Report

Issued: 6 am 11 Sep 2026 (local time)

Forecast update in  hr  min

Today's Kilcummin Harbour sea temperature is
15.8°C
1.5° 

Kilcummin Harbour surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Kilcummin Harbour surf forecast from 11 Sep 2026:

  • Best quality surf: Friday 18 Sep, 4AM (local time) - 11ft (3.5m), 13s period, WNW swell with cross-offshore winds.
  • Most powerful swell: Thursday 17 Sep, 10PM (local time) - 13ft (4.0m), 13s period, WNW swell with 5,105 kJ wave energy.
  • Next surfable swell (1★+): Saturday 12 Sep, 7PM (local time) - 7.5ft (2.3m), 12s period with WNW swell.

Best Forecast Surf Conditions for Kilcummin Harbour this week:

The surf forecast for Kilcummin Harbour over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 12) at 7PM. The primary swell is predicted to be 2.3m and 12s period with a secondary swell of 1.3m and 10s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Kilcummin Harbour in the next 16 days are 4.0m 13s and forecast to arrive on Thursday (Sep 17) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Monday (Sep 14) at 10AM.

Wave TypeTime (IST) & Date Wave Height & Period
Next good surf (1 star+) 7PM (Sat 12th Sep)7.5ft (2.3m) 12s
Best Surf 4AM (Fri 18th Sep)11ft (3.5m) 13s
Most Powerful10PM (Thu 17th Sep)13ft (4.0m) 13s

Table - best surf conditions forecast for Kilcummin Harbour over the next 16 days.


The Lowdown

Alright, Rusty here, and let's have a look at the run ahead for us. We've only got one spot on the radar this time, so all eyes are on Kilcummin Harbour. It's a reef break that's exposed to the swell, and when it lines up, it can be a gem. The water temp is running about average for this time of year, nothing too unusual there.

The week starts off with a bit of a wait, but things kick into gear on Friday the 11th. Friday morning delivers a clean 6ft swell out of the WNW with a period of 9 seconds. The wind is a cross-off from the WSW, keeping things tidy. The combined energy is moderate at 547, so there's some push there. It's not a massive day, but a good start to the window and a solid option for a quick session. The crowds are only sometimes an issue here, so you might have a bit of company, but nothing crazy.

Saturday the 12th sees a jump in size. We're looking at a 10ft swell from the W and WNW, with a period stretching out to 12 seconds. Now, this is getting into the territory where it's more for experienced surfers, as it's over 8ft. The energy is strong on Saturday morning, clocking in at 2512. The downside is the wind is up from the SW at 25 km/h, creating a cross-off, but the afternoon gets a bit lumpy with a cross-chop. Between the size and the breeze, it might be a bit of a handful.

Now, Sunday the 13th is a standout. The swell drops back to a clean 5ft from the WNW, but the period remains a long 11 seconds, which is groundswell and means good shape. The wind is glassy from the SE at just 3 mph. That's a major positive. The surf will be clean as a whistle. The energy is moderate at 640. This is the kind of morning you wake up early for. It won't be huge, but the quality will be there for anyone who wants a proper ride.

Monday the 14th offers a bit more. The morning has clean 4ft waves (WSW, 8 secs) with light offshore wind from the S, and the combined energy is 381. It's a solid learner-to-intermediate window if the Sunday crowd was too much.

The middle of the week gets rough. Tuesday and Wednesday, the 15th and 16th, are pretty much write-offs. We've got 19 mph winds creating lumpy, cross-onshore conditions and poor surf. The swell is there, but you don't want it. Thursday the 17th is a different beast. The swell jumps to 12ft to 13ft from the WNW with a very long 13-second period. The combined energy is massive, hitting 4848 on Thursday afternoon. This is expert territory only. The morning has a clean cross-off wind, but the afternoon is cross-shore and choppy. It will be a powerful, heavy day for those who are charging.

Friday the 18th and into the weekend, the swell stays big. We're looking at 16ft to 23ft by Saturday the 19th, with 13 to 15-second periods. The combined energy is off the charts at 12751, even hitting 21253. The finder notes this is too big for this break for the most part, and the wind is mostly cross-off, keeping it clean, but that size is insane. This is big-wave territory, and only the very best should even consider it. Sunday the 20th is a mess, with strong winds and lumpy seas.

The following week starts to settle. Monday the 21st still has 16ft waves, so it's still huge, but the wind drops to a gentle breeze. It’s still way too big for a casual paddle.

The next real highlight comes on Tuesday the 22nd. The swell drops to a more manageable 8ft from the WNW with an 11-second period. The wind is offshore from the S at 9 mph, creating gentle offshore and clean conditions. The combined energy is 1736. This is a solid option for experienced surfers looking for a powerful, clean wave without the chaos.

Then look at Friday the 25th. The forecast shows an 12ft swell from the W with an 11-second period. The morning is glassy with a 3 mph wind from the SSW. This is a promising one, but it's a long way out, so take it with a pinch of salt. The energy is strong at 3565. It would be an excellent slot for experienced surfers if it holds.

Saturday the 26th is another huge day, with an 18ft swell and a very long 14-second period, but the finder says it’s predicted to be too big for the break.

So, the best of the best? Sunday the 13th for the cleaner, more user-friendly waves, and Friday the 25th for the more experienced crew looking for some size and power in glassy conditions. Keep an eye on the wind, and don't miss that Sunday morning.

Rusty.

Short Range Forecast

Moderate rain (total 14mm), heaviest on Fri night. Very mild (max 18°C on Sun afternoon, min 13°C on Fri night). Winds decreasing (fresh winds from the S on Fri night, calm by Sat night).

Days 4-6 Weather Summary

Light rain (total 9mm), mostly falling on Wed night. Very mild (max 18°C on Mon morning, min 12°C on Tue night). Winds increasing (light winds from the SSW on Mon morning, strong winds from the NW by Tue afternoon).

Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
2
3
2
3
2
3
2
2
2
1
1
1
0
0
3
1
1
1
2
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
WNW
9
1.9
WNW
9
2.5
W
13
3
WNW
12
3
WNW
12
2
WNW
12
1.5
WNW
11
1.3
WNW
10
1
WSW
9
0.7
N
13
1.8
W
10
1.8
W
10
2.3
W
10
2.5
W
10
3.5
WNW
11
2.5
WNW
10
2.2
WNW
10
2.5
W
9
3.5
WNW
11
3.5
WNW
12
4
WNW
13
Wave Graph
Metric surfscale
Energy kJ
547
599
2537
2547
2325
1044
523
320
161
163
640
587
1026
1520
2771
1567
942
1089
2757
3368
4805
Wind (km/h)
15
W
20
SW
35
S
25
WSW
20
SW
10
NNW
5
SSE
15
SSW
20
SSW
20
SSW
25
SSW
30
WSW
30
W
40
NW
30
NW
20
WSW
35
WSW
30
WNW
35
W
35
W
20
WSW
Wind State
cross
cross-off
off
cross-off
cross-off
cross-on
off
off
off
off
cross-off
cross-off
cross
cross-on
cross-on
cross-off
cross-off
cross
cross
cross
cross-off
High Tide
6:44PM3.86m
7:09AM3.38m
7:21PM3.82m
7:43AM3.38m
7:56PM3.66m
8:16AM3.32m
8:31PM3.42m
8:49AM3.19m
9:05PM3.12m
9:23AM3.01m
9:40PM2.80m
9:59AM2.79m
10:20PM2.49m
Low Tide
12:23PM0.09m
00:58AM-0.11m
1:00PM0.04m
1:31AM-0.07m
1:36PM0.07m
2:03AM0.06m
2:11PM0.19m
2:33AM0.27m
2:47PM0.39m
3:04AM0.51m
3:24PM0.63m
3:36AM0.78m
4:04PM0.91m
part cloud
part cloud
heavy rain
rain showers
cloud
rain showers
cloud
cloud
cloud
cloud
light rain
rain showers
rain showers
rain showers
cloud
cloud
rain showers
rain showers
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:03
7:05
7:05
7:07
7:09
7:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:04
8:01
7:59
7:57
7:53
7:52
7:49
 mm
11
1
2
2
2
1
1
1
2
Temp °C
15
16
17
17
17
16
17
18
17
18
16
16
15
14
13
14
15
15
14
14
12
Feels °C
11
11
13
14
15
16
16
16
15
15
12
12
9
7
6
10
9
10
7
8
8
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Kilcummin Harbour Surf forecast

The above surf forecast table for Kilcummin Harbour provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kilcummin Harbour can be found by selecting the local surf guide option on the grey menu. Our Kilcummin Harbour surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Kilcummin Harbour) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Kilcummin Harbour may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Kilcummin Harbour is 19 km (12 miles) from Ballina. If you plan a holiday in Mayo and Achill Island, look for hotels and other accommodation in Ballina. Ballina has rooms for a wide range of budgets as well as car hire and transport links.

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