Surf Forecasts:
Kilcummin Harbour surf forecast from 18 Aug 2026:
- Best quality surf: Monday 24 Aug, 4PM (local time) - 8ft (2.4m), 11s period, W swell with offshore winds.
- Most powerful swell: Tuesday 18 Aug, 10PM (local time) - 10ft (3.0m), 11s period, WNW swell with 1,812 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 10AM (local time) - 2.5ft (0.8m), 11s 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 Monday (Aug 24) at 10AM. The primary swell is predicted to be 0.8m and 11s period with a secondary swell of 1.0m and 8s. 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 3.0m 11s and forecast to arrive on Tuesday (Aug 18) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Tuesday (Aug 25) at 7AM.
| Wave Type | Time (IST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Mon 24th Aug) | 2.5ft (0.8m) 11s |
| Best Surf | 4PM (Mon 24th Aug) | 8ft (2.4m) 11s |
| Most Powerful | 10PM (Tue 18th Aug) | 10ft (3.0m) 11s |
Table - best surf conditions forecast for Kilcummin Harbour over the next 16 days.
The Lowdown
G’day, Rusty here.
Well, it’s a bit of a slow burner for the next week and a bit, but there’s some serious muscle showing up on the horizon if you’re patient. The first real window of opportunity doesn’t even pop up until Monday the 24th, and even then, it’s a building thing. Before that, we’re staring at a pretty flat and messy run of days, with nothing worth paddling out for.
We’ve got a solid spell of onshore and cross-shore winds keeping things chopped up and messy right through the weekend. The swell is small and weak, with periods struggling to get past 8 seconds. The combined energy is weak, sitting in the low hundreds or even under 100 (like 70 and 46 on Saturday). It’s a classic case of waiting it out. The water temp is about average for this time of year, no real surprises there.
Then Monday the 24th rolls around and things start to get interesting. The morning has some clean conditions with a light offshore, but it’s still only showing 3 ft. The real spark is that afternoon. The wind swings offshore and it’s clean, with a building 8 ft swell from the west at 11 seconds. The energy jumps right up into that moderate range (1318). That’s your first genuine standout, and it’s looking like the best call for a week that’s been mostly dead. Kilcummin Harbour (Kilcummin-Harbour) is the spot here.
Things get messy again for a few days after that, with onshore winds and chop messing up a small swell. We’re back to waiting. There’s a brief window on Thursday the 27th afternoon with a clean 5 ft west-northwest swell and light cross-offshore wind, but it’s not quite the same quality as Monday. It’s surfable, but nothing special.
Now, for the long range, there’s something to keep an eye on. Saturday the 29th of August has a big pulse of 15 ft predicted, but that’s way too much size for this break – that’s expert-only territory and it’s flagged as too big. The following day, Sunday the 30th, still has the clean offshore conditions with a more manageable 8 ft west-northwest swell. That afternoon looks tasty for experienced surfers, with strong moderate energy (1077). Then Monday the 31st keeps that clean offshore flow with a solid 7 ft west-southwest swell, looking very good.
So, the one to circle on the calendar for the second week is that Sunday the 30th, with Monday the 31st as a solid backup. The first week has just the one standout on Monday the 24th. Beyond that, it’s about picking the clean windows when they come.
Stay stoked.
Rusty
Short Range ForecastLight rain (total 5mm), mostly falling on Tue night. Very mild (max 16°C on Mon night, min 13°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun morning. Very mild (max 16°C on Sun afternoon, min 13°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | W 8 | W 10 | WNW 11 | WNW 10 | W 10 | WNW 10 | N 8 | N 8 | N 7 | N 6 | N 6 | N 6 | NNW 5 | NNW 5 | NW 5 | NW 5 | NW 8 | NW 7 | WNW 11 | W 11 | W 10 |
Wave Graph | |||||||||||||||||||||
501 | 1199 | 1685 | 1470 | 1249 | 1004 | 970 | 527 | 260 | 206 | 148 | 62 | 35 | 19 | 16 | 28 | 57 | 44 | 140 | 1317 | 561 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | cross | on | on | on | on | on | on | on | on | on | cross-on | cross | cross-on | off | off | off | cross-off |
High Tide | 10:06AM2.89m | 10:23PM2.94m | 10:47AM2.70m | 11:07PM2.61m | 11:38AM2.50m | 00:05AM2.33m | 12:49PM2.36m | 1:31AM2.17m | 2:25PM2.35m | 3:09AM2.20m | 3:46PM2.51m | 4:16AM2.35m | 4:40PM2.74m | ||||||||
Low Tide | 3:59PM0.66m | 4:28AM0.76m | 4:45PM0.93m | 5:11AM1.02m | 5:44PM1.18m | 6:11AM1.24m | 7:15PM1.34m | 7:46AM1.33m | 9:03PM1.31m | 9:17AM1.23m | 10:12PM1.13m | 10:15AM1.04m | 10:58PM0.92m | ||||||||
6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | |
— | — | 9:01 | — | — | 9:00 | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:50 | — | — | 8:47 | — | |
mm | — | — | 1 | 1 | — | 3 | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | 3 |
Temp °C | 16 | 16 | 14 | 16 | 16 | 14 | 14 | 14 | 13 | 13 | 13 | 14 | 15 | 14 | 14 | 15 | 16 | 14 | 16 | 18 | 16 |
Feels °C | 11 | 11 | 10 | 11 | 11 | 12 | 7 | 8 | 7 | 7 | 7 | 11 | 12 | 10 | 11 | 12 | 13 | 14 | 11 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | N 7 | N 7 | N 7 | W 17 | N 8 | WNW 10 | W 10 | W 9 | WNW 8 | WNW 8 | WNW 7 | WSW 8 | WSW 9 | WSW 9 | NNE 5 | NW 5 | NW 8 | NW 7 | W 8 | W 11 | W 10 |
4 | 4 | 4 | 6 | 1 | 1004 | 226 | 169 | 92 | 32 | 31 | 14 | 15 | 15 | 8 | 28 | 57 | 44 | 111 | 1317 | 561 | |
Swell 2 Height (m) Direction Period (s) | W 16 | W 18 | — | — | — | — | W 16 | W 15 | W 15 | WSW 8 | WSW 9 | WNW 6 | NNE 9 | NNE 9 | WNW 9 | WNW 8 | WSW 8 | WSW 9 | WNW 11 | N 8 | N 8 |
5 | 6 | — | — | — | — | 5 | 4 | 4 | 14 | 15 | 6 | 15 | 8 | 16 | 27 | 7 | 7 | 140 | 1 | 1 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | W 17 | W 16 | NNE 9 | W 16 | NW 10 | WSW 9 | WSW 9 | N 6 | N 8 | N 8 | — | — |
— | — | — | — | — | — | — | — | — | 6 | 5 | 8 | 5 | 4 | 16 | 7 | 3 | 5 | 5 | — | — | |
Wind waves Height (m) Direction Period (s) | W 8 | W 10 | WNW 11 | WNW 10 | W 10 | N 7 | N 8 | N 8 | N 7 | N 6 | N 6 | N 6 | NNW 5 | NNW 5 | NW 5 | — | — | — | S 3 | S 4 | SSE 3 |
501 | 1199 | 1685 | 1470 | 1249 | 1 | 970 | 527 | 260 | 206 | 148 | 62 | 35 | 19 | 16 | — | — | — | 5 | 9 | 9 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 351 | 550 | 2 | 185 | 171 | 55 | 235 | 276 | 300 | 416 | 276 | 244 | 201 | 276 | 66 | 117 | 171 | 11 | 0 | 0 | 61 |
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.











