
Surf Forecasts:
Kilcummin Harbour surf forecast from 11 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 10PM (local time) - 3ft (0.9m), 11s period, WSW swell with cross-offshore winds.
- Most powerful swell: Friday 14 Aug, 10PM (local time) - 6ft (1.8m), 8s period, WNW swell with 414 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 4PM (local time) - 2.5ft (0.7m), 9s 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 4PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.4m and 7s. The wind is predicted to be 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 Friday (Aug 14) 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 0.7m 4s period and expected on Sunday (Aug 16) at 4PM.
| Wave Type | Time (IST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Tue 11th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 10PM (Tue 11th Aug) | 3ft (0.9m) 11s |
| Most Powerful | 10PM (Fri 14th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Kilcummin Harbour over the next 16 days.
The Lowdown
G’day, it’s Rusty here, and I’ve been staring at the charts for Kilcummin Harbour, and honestly, it’s a bit of a mixed bag. We’ve got a slow start, a rough patch in the middle, but a decent little window at the end of the first week that looks like the pick of the lot. The water temp is sitting at 61°F, which is a touch warmer than usual for this time of year, so you won’t need the thickest rubber, just a good wetsuit.
The week starts off pretty ordinary, with the Tuesday morning session at Kilcummin Harbour (Kilcummin-Harbour) being a write-off. There’s a small 3ft northwest swell rolling in with a 9-second period, but the cross-off wind from the SSE is making it messy, and the energy is only weak to moderate at 137. The afternoon cleans up a little with a proper offshore, but it’s still pretty average, and the swell drops slightly to 2ft.
Wednesday’s a bit better, with a WSW swell at 3ft and a bit more period behind it on the morning session. The wind is holding offshore, so it’s clean, but the energy is still only moderate at 146. The afternoon is similar, just a touch less energy. These are surfable waves, but nothing to get too excited about.
Then things start to pick up a little on Thursday. The swell bumps up to 4ft from the west, with a 10-second period, and the energy jumps to a solid moderate reading of 246. The wind is offshore in the morning, and the call is for good surf conditions. This is when it starts to feel like a surf trip, not just a paddle around. The afternoon stays clean too, with a gentle cross-off. This looks like the first session worth pointing the car at.
Friday and Saturday are a letdown, to be honest. The swell pushes up a bit—4ft on Friday morning, building to 5ft by Saturday—but the wind swings onshore and cross-shore, and the wave state gets chopped up. The energy is picking up, but it’s messy, and the period drops off to 7 or 8 seconds. That’s not the kind of surf you want. The quality just isn’t there.
Sunday morning has some light rain and a 3ft WNW swell, but the period is only 7 seconds, and while the wind is offshore, the wave quality is still poor. The afternoon is weaker again, a 2ft N swell with a slightly better 9-second period. It’s ordinary.
The following week starts off with small, clean, but pretty weak surf on Monday, with 3ft and a 9-second period, but the energy is dropping into the double digits. Tuesday brings a bit more swell, but the period is short again, and the wind is messing with it.
Now, here’s where it gets interesting. If you can wait until Thursday the 20th, there’s a proper pulse of swell. The height jumps to 7ft from the WNW with a 10-second period, and the energy is strong at 929. The wind is cross-offshore, so it’s clean, but at 7ft, this is pushing past beginner territory. You’ll want your wits about you.
But the real standout is Friday the 21st. That morning, we’ve got 8ft of WNW groundswell with an 11-second period, and the energy is very strong at 1598. The wind is a fresh offshore from the south, which will groom it nicely. This is the biggest, cleanest swell of the window, and at this size, it’s strictly for experienced surfers. The afternoon holds similar size, and the energy is still huge. This is the one to circle on the calendar, but with a warning—8ft at a reef break like Kilcummin is heavy, it’s not for the faint-hearted.
After that, Saturday the 22nd turns nasty again with strong cross-onshore winds and lumpy, messy surf. The swell is still there, around 5ft, but it’s blown out. The rest of the weekend and into Monday is more of the same—windy and messy, with energy levels all over the place. There’s another pulse on Tuesday the 25th with 8ft from the NNW and a 9-second period, but the wind is cross-shore and lumpy, so it’s not going to be clean.
So here’s the straight talk. The best on offer is Friday the 21st at Kilcummin Harbour, hands down. Big, clean, and powerful. If you’re not up for that, Thursday afternoon the 20th is your next best bet. The rest of the window is pretty average, with a lot of blown-out and messy days. Stay patient this week, and be ready for the 21st.
Rusty, out.
Short Range ForecastModerate rain (total 11mm), heaviest on Thu morning. Warm (max 22°C on Tue afternoon, min 13°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Very mild (max 16°C on Fri morning, min 13°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
AM | 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 9 | N 9 | WSW 10 | WSW 10 | WSW 9 | W 11 | W 10 | WSW 10 | WSW 9 | W 8 | W 7 | WNW 8 | WNW 8 | WNW 8 | WNW 7 | WNW 7 | N 9 | W 9 | W 8 | W 8 | W 7 |
Wave Graph | |||||||||||||||||||||
102 | 73 | 180 | 135 | 124 | 332 | 245 | 245 | 108 | 200 | 218 | 414 | 291 | 245 | 142 | 88 | 76 | 125 | 82 | 58 | 40 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | off | off | off | cross-off | cross | cross | cross | cross | cross | cross | off | off | off | cross-off | cross-off | cross-off | off |
High Tide | 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 | 9:28AM3.06m | 9:44PM3.29m | ||||||||
Low Tide | 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 | 3:19PM0.40m | 3:51AM0.49m | |||||||
6:05 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:16 | — | — | |
— | — | 9:16 | — | — | 9:15 | — | — | 9:13 | — | — | 9:10 | — | — | 9:07 | — | — | 9:06 | — | — | 9:04 | |
mm | — | — | — | — | — | — | 7 | 3 | 1 | — | — | — | — | — | 1 | 1 | — | — | — | — | 1 |
Temp °C | 19 | 22 | 21 | 21 | 22 | 20 | 19 | 19 | 16 | 16 | 15 | 14 | 15 | 16 | 13 | 15 | 15 | 15 | 18 | 19 | 18 |
Feels °C | 14 | 21 | 20 | 20 | 21 | 21 | 18 | 19 | 14 | 11 | 10 | 10 | 11 | 12 | 12 | 12 | 13 | 14 | 17 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | N 9 | N 9 | WSW 10 | WSW 10 | WSW 9 | W 11 | W 10 | WSW 10 | WSW 9 | N 10 | N 10 | N 9 | WNW 8 | WNW 8 | WNW 7 | WNW 7 | N 9 | W 9 | W 8 | W 8 | W 7 |
102 | 73 | 180 | 135 | 124 | 332 | 245 | 245 | 108 | 8 | 17 | 15 | 291 | 245 | 142 | 88 | 76 | 125 | 82 | 58 | 40 | |
Swell 2 Height (m) Direction Period (s) | NW 8 | WSW 7 | N 8 | N 8 | N 8 | N 7 | N 7 | N 7 | N 11 | N 10 | — | — | N 10 | N 10 | N 9 | N 9 | NW 7 | N 8 | N 8 | NNE 7 | N 8 |
20 | 16 | 33 | 11 | 5 | 4 | 1 | 1 | 2 | 8 | — | — | 17 | 16 | 15 | 61 | 31 | 47 | 30 | 18 | 20 | |
Swell 3 Height (m) Direction Period (s) | W 7 | WSW 12 | NW 7 | — | SSE 3 | — | — | — | N 9 | — | — | — | — | — | W 8 | WSW 8 | WSW 6 | NW 7 | NNW 6 | N 9 | NW 6 |
15 | 48 | 2 | — | 1 | — | — | — | 2 | — | — | — | — | — | 1 | 6 | 11 | 11 | 4 | 13 | 1 | |
Wind waves Height (m) Direction Period (s) | SE 4 | SSE 3 | SSE 2 | SE 3 | — | — | SSE 2 | — | W 4 | W 8 | W 7 | WNW 8 | — | — | — | SE 3 | SE 4 | E 3 | — | — | — |
10 | 4 | 1 | 5 | — | — | 1 | — | 19 | 200 | 218 | 414 | — | — | — | 2 | 13 | 3 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 244 | 447 | 373 | 447 | 416 | 247 | 0 | 11 | 0 | 0 | 0 | 0 | 56 |
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.











