Surf Forecasts:
Kilcummin Harbour surf forecast from 17 Aug 2026:
- Best quality surf: Monday 17 Aug, 1PM (local time) - 3ft (0.9m), 8s period, W swell with offshore winds.
- Most powerful swell: Wednesday 19 Aug, 4AM (local time) - 11ft (3.5m), 10s period, W swell with 2,852 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 1PM (local time) - 3ft (0.9m), 8s period with W 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 17) at 1PM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.4m 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 3.5m 10s and forecast to arrive on Wednesday (Aug 19) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Monday (Aug 17) at 4PM.
| Wave Type | Time (IST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Mon 17th Aug) | 3ft (0.9m) 8s |
| Best Surf | 1PM (Mon 17th Aug) | 3ft (0.9m) 8s |
| Most Powerful | 4AM (Wed 19th Aug) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Kilcummin Harbour over the next 16 days.
The Lowdown
Alright, Rusty here again – let’s talk in feet and miles per hour.
The outlook is a tough one for a while. The first week is mostly a dud, with a big gap of days where you’d be wasting your time. The first real chance to surf doesn’t come until Tuesday the 25th, and even then it’s just okay.
We’re looking at Kilcummin Harbour (Ireland), a reef break that needs the right swell direction. The best swell is from the NNW, and we don’t get that for a while.
From Monday the 17th through Monday the 24th, it’s a no-go. The wind is onshore, the swell is small, or the period is too short. Tuesday the 18th has a spike to about 7ft from the W, but the wind is a mess – a 30 km/h cross-shore makes it lumpy. Not worth it. Wednesday the 19th morning has a solid 12ft swell from the WNW at 11 seconds, but the wind is a 25 km/h cross-off, and the energy is high (2783) – but the quality just isn’t there. By Thursday and Friday, the wind blows straight onshore from the N, ruining the shape. The weekend of the 22nd and 23rd is flat.
Tuesday the 25th is the first tiny window. Morning brings a 6ft swell from the W, 8 second period, with a light 15 km/h cross-off breeze. The combined energy is moderate (463). It’s clean, and it’s rideable. Water temp is about average. If you’re intermediate and just want to paddle, this is your slot. Crowds are possible here at times.
Now for the real standout. Thursday the 27th of August – this is the one to circle. Swell jumps to a massive 16ft from the W, with a very long 14-second period. That’s serious power (9839). The wind is a gentle 15 km/h cross-off from the SW, making it glassy clean. This is a dream for the reef. But 16ft is way too big for most. This is experts-only. Big, thick sets with plenty of energy. If you’ve got the skills, this is the best day of the entire 16-day outlook.
Friday the 28th drops to a more manageable 8ft from the NNW, but the wind is lumpy and cross-shore. Not a standout.
Then another big one rolls in for Monday the 1st of September – again 16ft from the WNW with a 14-second period, and clean cross-off wind from the SSE. The energy is enormous (9059). Again, only for the very experienced.
So, bottom line: the first week is a wash. The best clean day for the average surfer is Tuesday 25th August. The absolute best, must-paddle day for experts is Thursday 27th August. The 1st of September also has potential, but that’s far out – check back closer to the date.
Don’t fight the wind, boys.
- Rusty
Short Range ForecastModerate rain (total 12mm), heaviest on Mon morning. Very mild (max 17°C on Mon afternoon, min 14°C on Tue night). Winds increasing (light winds from the S on Mon morning, fresh winds from the N by Wed night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Thu morning. Very mild (max 15°C on Sat afternoon, min 13°C on Thu afternoon). Mainly fresh winds. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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 8 | W 7 | W 8 | W 10 | W 11 | WNW 11 | WNW 10 | WNW 10 | N 8 | N 8 | N 7 | N 6 | N 6 | NNW 5 | NNW 5 | NW 6 | NW 6 | WNW 6 | WNW 7 | WNW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 108 | 80 | 267 | 507 | 1320 | 2197 | 2454 | 1567 | 898 | 583 | 327 | 178 | 148 | 89 | 46 | 62 | 77 | 98 | 70 | 145 | 71 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-on | on | on | on | on | on | on | on | on | cross-on | cross | cross | on | cross-on |
High Tide | 9:44PM3.29m | 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 | |||||||||
Low Tide | 3:19PM0.40m | 3:51AM0.49m | 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 | ||||||||
 | |  |  |  |  |  |  | | | |  | | |  | | | | | | | |
 | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — |
 | — | — | 9:04 | — | — | 9:01 | — | — | 9:00 | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:50 | — |
mm | 4 | 2 | — | — | — | 2 | 2 | — | 2 | 1 | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 16 | 17 | 16 | 16 | 16 | 14 | 16 | 16 | 14 | 14 | 14 | 13 | 13 | 14 | 14 | 14 | 15 | 14 | 15 | 15 | 14 |
Feels °C | 14 | 14 | 13 | 11 | 10 | 9 | 11 | 11 | 11 | 8 | 8 | 8 | 7 | 8 | 10 | 11 | 12 | 12 | 12 | 12 | 13 |
Swell 1 Height (m) Direction Period (s) | N 8 | W 8 | N 7 | N 7 | N 7 | N 7 | W 17 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | N 6 | NNE 8 | WNW 6 |
| kJ | 30 | 80 | 9 | 4 | 4 | 1 | 6 | 1567 | 898 | 216 | 169 | 99 | 55 | 32 | 33 | 31 | 29 | 16 | 41 | 11 | 71 |
Swell 2 Height (m) Direction Period (s) | NW 7 | N 7 | W 19 | W 16 | W 18 | — | — | N 8 | — | W 16 | W 15 | W 15 | WSW 9 | WSW 9 | NNE 8 | N 9 | N 9 | WNW 9 | WSW 9 | WSW 9 | WSW 9 |
| kJ | 15 | 17 | 7 | 5 | 6 | — | — | 1 | — | 5 | 4 | 4 | 15 | 15 | 12 | 6 | 7 | 8 | 16 | 9 | 16 |
Swell 3 Height (m) Direction Period (s) | — | NNW 6 | — | — | — | — | — | — | — | — | — | — | W 12 | W 11 | W 16 | SW 16 | N 8 | NNE 9 | NNE 9 | SW 16 | N 7 |
| kJ | — | 4 | — | — | — | — | — | — | — | — | — | — | 3 | 2 | 5 | 10 | 1 | 8 | 8 | 9 | 8 |
Wind waves Height (m) Direction Period (s) | W 8 | SSW 3 | W 7 | W 8 | W 10 | W 11 | WNW 11 | — | N 6 | N 8 | N 8 | N 7 | N 6 | N 6 | NNW 5 | NNW 5 | NW 6 | NW 6 | WNW 6 | WNW 7 | — |
| kJ | 108 | 6 | 267 | 507 | 1320 | 2197 | 2454 | — | 139 | 583 | 327 | 178 | 148 | 89 | 46 | 62 | 77 | 98 | 70 | 145 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 2 | 453 | 351 | 550 | 194 | 171 | 244 | 242 | 270 | 297 | 151 | 297 | 297 | 151 | 151 | 293 | 2 | 244 | 66 | 55 |
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.
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