
Surf Forecasts:
Kilcummin Harbour surf forecast from 11 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 4AM (local time) - 3.5ft (1.1m), 10s period, N swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 10AM (local time) - 6ft (1.8m), 8s period, WNW swell with 424 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 4AM (local time) - 3.5ft (1.1m), 10s period with N 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 Tuesday (Aug 11) at 4AM. The primary swell is predicted to be 1.1m and 10s period with a secondary swell of 0.5m and 7s. 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 1.8m 8s and forecast to arrive on Saturday (Aug 15) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 3s period and expected on Tuesday (Aug 11) at 10AM.
| Wave Type | Time (IST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Tue 11th Aug) | 3.5ft (1.1m) 10s |
| Best Surf | 4AM (Tue 11th Aug) | 3.5ft (1.1m) 10s |
| Most Powerful | 10AM (Sat 15th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Kilcummin Harbour over the next 16 days.
The Lowdown
Alright, let’s get into it. Kilcummin Harbour is the only break on the table this forecast, and it’s a reef setup that needs the right combination. We’ve got a bit of a slow start with very ordinary conditions through the first week, but the second week is where things get interesting with some serious swell potential. Hang tight.
Kilcummin Harbour – The first real nod comes on Monday the 10th of August with small 4ft swell from the north, 10-second period, and moderate wave energy (405). It’s a cross-shore southeast breeze at 10 mph, so it’s not clean, and the water’s a touch warmer than normal at 61°. Honestly, it’s marginal. Not worth racing out for.
Tuesday the 11th sees cleaner conditions with an offshore breeze from the SSE at 12 mph, but the swell drops to 3ft from the north. Period is 9 seconds, energy low (137). Surfable, but small. Wednesday the 12th is similar with a 3ft west-northwest swell, but by afternoon the wind swings cross-offshore and conditions look poor.
Thursday the 13th morning is the first decent moment – 4ft swell from the west, 10-second period, and clean offshore wind from the south. Wave energy picks up (246) and it’s looking like good surf conditions. This is a solid small-wave option for intermediate surfers. Not a standout, but the best of the first week.
From Friday the 14th through Sunday the 16th, conditions go downhill. Cross and cross-onshore winds, lumpy chop, and a mix of small to messy swell. The 15th has 6ft but it’s junky with a 440 energy reading – not clean enough to enjoy.
Monday the 17th brings a glassy morning and afternoon with a light east breeze, but the swell is only 4ft from the west-southwest and energy is moderate (194). The waves are ordinary but at least it’s clean. Still, not a standout.
Tuesday the 18th has offshore winds again with a 4ft west swell, period 7 seconds, energy 154. It’s okay, but short period makes it weak.
Now, Thursday the 20th of August is where it ramps up. Swell hits 8ft from the west-northwest, period 10 seconds, and the energy jumps to 1371! That is strong wave energy. Wind is light cross-onshore though, so it’s a bit rippled. This is getting big, but for experienced surfers it could be worth a look – tide will be key. The score is promising.
Friday the 21st of August morning is the real standout of the entire outlook. Swell is 8ft from the west, period 10 seconds, energy is 1131 – that’s strong. And the wind is offshore from the SSE at 15 mph, making for clean, powerful waves. This is excellent surf for experienced surfers. If you can handle it, this is the session to aim for. The afternoon gets messy with rain and fresh winds.
Saturday the 22nd is massive but ugly – 13ft from the northwest with cross-onshore winds and a choppy mess. Not for surfing, maybe more interesting for kite gear.
Sunday the 23rd has a clean moment in the morning with a 6ft north swell, cross-offshore wind, and 754 energy. It’s okay but nothing special. The afternoon has a 3ft west swell with a very long 16-second period (low energy 675) – groundswell, best on points and reefs, but pretty small.
Monday the 24th morning has clean 3ft west swell, 12-second period, light offshore wind, and good conditions. A nice small-wave option.
Tuesday the 25th of August morning is another standout. 10ft from the west, 10-second period, energy 1875 – that’s very strong. Light cross-offshore wind, clean. This is for experts only – too big for beginners. Very promising but still two weeks out, so treat it as a hopeful eye on the horizon.
Overall, the best on offer is Friday the 21st morning for experienced surfers, and Tuesday the 25th morning as a long-range standout. The first week is mostly small and average, with Thursday the 13th being the only clean small-wave window.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Thu morning. Warm (max 23°C on Wed afternoon, min 13°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Thu afternoon. Warm (max 22°C on Thu afternoon, min 13°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Mon 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | ||||||||||||||||||||
Wave Height (m) Direction Period (s) | N 10 | N 10 | N 9 | N 9 | WSW 10 | WSW 10 | WSW 9 | W 11 | W 10 | WSW 10 | W 9 | W 8 | W 8 | WNW 8 | WNW 8 | WNW 8 | NW 8 | NW 8 | N 9 | WSW 8 |
Wave Graph | ||||||||||||||||||||
302 | 271 | 102 | 73 | 180 | 132 | 124 | 326 | 245 | 245 | 160 | 140 | 291 | 402 | 424 | 318 | 186 | 111 | 56 | 118 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | off | off | off | off | cross-off | off | off | cross-off | cross-off | cross | cross-on | cross | cross | cross-on | cross | cross | on | on |
High Tide | 4:44PM3.18m | 5:15AM2.96m | 5:37PM3.50m | 6:06AM3.13m | 6:24PM3.77m | 6:51AM3.25m | 7:07PM3.92m | 7:33AM3.29m | 7:48PM3.95m | 8:12AM3.27m | 8:27PM3.83m | 8:51AM3.19m | 9:06PM3.60m | |||||||
Low Tide | 11:03PM0.45m | 11:12AM0.43m | 11:55PM0.18m | 11:59AM0.22m | 00:41AM-0.01m | 12:41PM0.08m | 1:23AM-0.10m | 1:22PM0.03m | 2:03AM-0.08m | 2:01PM0.07m | 2:40AM0.04m | 2:40PM0.20m | 3:16AM0.24m | |||||||
— | — | 6:05 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | |
— | 9:19 | — | — | 9:16 | — | — | 9:15 | — | — | 9:13 | — | — | 9:10 | — | — | 9:07 | — | — | 9:06 | |
mm | — | — | — | — | — | — | — | 1 | 4 | 2 | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 16 | 16 | 19 | 22 | 21 | 21 | 23 | 20 | 19 | 22 | 15 | 16 | 15 | 14 | 15 | 15 | 14 | 15 | 15 | 14 |
Feels °C | 14 | 14 | 14 | 21 | 20 | 20 | 22 | 21 | 17 | 21 | 13 | 12 | 11 | 11 | 12 | 11 | 12 | 14 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | N 10 | N 10 | N 9 | N 9 | WSW 10 | WSW 10 | WSW 9 | W 11 | W 10 | WSW 10 | W 9 | N 11 | N 10 | N 9 | N 9 | WNW 8 | NW 8 | NW 8 | NW 7 | WSW 8 |
302 | 271 | 102 | 73 | 180 | 132 | 124 | 326 | 245 | 245 | 160 | 9 | 17 | 15 | 16 | 318 | 186 | 111 | 44 | 118 | |
Swell 2 Height (m) Direction Period (s) | W 8 | W 7 | NW 8 | WSW 7 | N 8 | N 8 | N 8 | N 7 | N 7 | N 7 | N 11 | — | — | — | — | N 9 | N 9 | N 9 | N 9 | N 8 |
57 | 25 | 20 | 15 | 33 | 11 | 5 | 4 | 1 | 1 | 3 | — | — | — | — | 15 | 15 | 26 | 56 | 47 | |
Swell 3 Height (m) Direction Period (s) | NW 8 | NW 8 | W 7 | WSW 12 | NW 7 | — | — | — | — | — | N 9 | — | — | — | — | — | W 8 | W 6 | W 8 | NW 7 |
46 | 37 | 15 | 48 | 2 | — | — | — | — | — | 2 | — | — | — | — | — | 1 | 3 | 49 | 11 | |
Wind waves Height (m) Direction Period (s) | — | — | SE 3 | SE 3 | SSE 2 | SSE 3 | — | — | S 2 | — | — | W 8 | W 8 | WNW 8 | WNW 8 | — | — | — | SE 4 | SSE 3 |
— | — | 11 | 5 | 1 | 4 | — | — | 1 | — | — | 140 | 291 | 402 | 424 | — | — | — | 10 | 4 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 10 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 2 | 0 | 245 | 531 | 297 | 447 | 448 | 2 | 2 | 66 | 52 |
Best forecast wave conditions in Mayo and Achill Island | ||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||
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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.











