
Surf Forecasts:
Kilcummin Harbour surf forecast from 3 Sep 2026:
- Best quality surf: Friday 4 Sep, 7AM (local time) - 16ft (5.0m), 12s period, W swell with cross-offshore winds.
- Most powerful swell: Friday 4 Sep, 10AM (local time) - 16ft (5.0m), 12s period, WNW swell with 7,649 kJ wave energy.
- Next surfable swell (1★+): Friday 4 Sep, 7AM (local time) - 16ft (5.0m), 12s 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 Friday (Sep 04) at 7AM. The primary swell is predicted to be 5.0m and 12s period with a secondary swell of 0.4m and 9s. 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 5.0m 12s and forecast to arrive on Friday (Sep 04) 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 1.1m 4s period and expected on Sunday (Sep 06) at 10AM.
| Wave Type | Time (IST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Fri 4th Sep) | 16ft (5.0m) 12s |
| Best Surf | 7AM (Fri 4th Sep) | 16ft (5.0m) 12s |
| Most Powerful | 10AM (Fri 4th Sep) | 16ft (5.0m) 12s |
Table - best surf conditions forecast for Kilcummin Harbour over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s shaping up for Kilcummin Harbour. This is a reef break, pretty exposed to the swell, and it needs a good direction to work. When it’s on, it’s on, but it’s not a spot that fires every day. The water is sitting at 62°, which is a touch warmer than normal for this time of year, so you might get away with a slightly thinner wetsuit.
Right now, we’ve got a slow start. Thursday the 3rd is a bit of a write-off, with some lumpy cross-off wind and messy, short-period swell. Just not worth the paddle. Friday the 4th, though, is a bit of a beast. We’ve got a massive 16ft swell rolling in from the WNW, with a period of 12 seconds, and it’s pushing massive combined swell energy (7664). The wind is strong cross-off, but honestly, this is way too big for this spot. This is strictly for the absolute experts only, and even then, it’s a maybe. The morning is the only window, as the afternoon turns into a lumpy mess.
Saturday the 5th is where it gets interesting. The swell drops back to a much more manageable 8ft from the WNW, and the morning has a light cross-off breeze. The combined energy is still solid (1121), and the period is a nice 10 seconds. This is excellent for experienced surfers, and the afternoon cleans up even more with light offshore winds from the S. This is the standout of the first week.
Sunday the 6th sees the swell drop off a cliff, down to 4ft. The morning has fresh offshore wind, but there’s just not enough energy in the water (194). The afternoon picks up a little, but it’s still small. Monday the 7th and Tuesday the 8th are messy, with strong winds and big, lumpy swell that’s just not well-shaped for the reef. Wednesday the 9th afternoon is a nice little window with clean offshore wind and a 5ft NW swell, but it’s not a big day.
The second week is a mixed bag. Thursday the 10th and Friday the 11th are both blown out or too big, with strong cross-shore winds. Saturday the 12th morning is another big one for the brave. A 13ft WNW swell with a very long 13-second period, and light wind. The combined energy is massive (4611). This is a serious groundswell, and it will be a very heavy, powerful wave at the reef. This is experts-only territory, and the long period might make it a bit too straight for the harbour, but it’s a spectacle. The best bet for the average surfer in the second week is Tuesday the 15th. A beautiful 6ft WNW swell with glassy conditions in the afternoon. The wind is dead calm, the combined energy is moderate (761), and the period is a clean 10 seconds. This will be a fun, clean, head-high day with almost no crowd. After that, the wind starts to get messy again, and the swell gets thrown around by strong cross-shore breezes from Thursday the 17th onwards.
So, for the best on offer, grab Saturday the 5th morning for the best balance of size, power, and clean conditions. For a pure, glassy, fun session, mark Tuesday the 15th afternoon in your calendar.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Thu afternoon. Very mild (max 18°C on Sun morning, min 13°C on Thu night). Winds decreasing (strong winds from the WSW on Thu night, light winds from the SW by Fri night). | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sun night. Very mild (max 19°C on Sun afternoon, min 11°C on Mon night). Winds increasing (light winds from the WSW on Mon night, strong winds from the W by Tue afternoon). | |||||||||||||||||||
Thu 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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 12 | WNW 12 | WNW 12 | WNW 10 | WNW 9 | W 9 | W 8 | WSW 9 | W 10 | W 9 | W 8 | W 10 | WNW 10 | WNW 11 | NW 12 | NW 11 | NW 10 | W 8 |
Wave Graph | ||||||||||||||||||||
576 | 1786 | 7649 | 5782 | 3371 | 1288 | 766 | 252 | 173 | 277 | 824 | 895 | 941 | 1864 | 3204 | 4783 | 3493 | 1594 | 948 | 234 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross-off | off |
High Tide | 10:39PM2.83m | 11:14AM2.71m | 11:49PM2.56m | 12:36PM2.60m | 1:27AM2.41m | 2:14PM2.67m | 3:05AM2.49m | 3:35PM2.94m | 4:17AM2.71m | 4:35PM3.27m | 5:09AM2.95m | 5:23PM3.57m | ||||||||
Low Tide | 4:14PM0.72m | 4:44AM0.79m | 5:20PM0.95m | 5:55AM1.03m | 6:59PM1.08m | 7:36AM1.11m | 8:50PM0.96m | 9:09AM0.97m | 10:06PM0.67m | 10:12AM0.71m | 11:00PM0.36m | 11:01AM0.45m | 11:44PM0.11m | |||||||
— | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | |
8:23 | — | — | 8:22 | — | — | 8:19 | — | — | 8:16 | — | — | 8:14 | — | — | 8:12 | — | — | 8:08 | — | |
mm | 6 | 1 | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 2 | — | — | 1 | — | 4 | 10 |
Temp °C | 15 | 15 | 15 | 15 | 13 | 16 | 15 | 16 | 18 | 19 | 16 | 14 | 15 | 13 | 14 | 14 | 14 | 15 | 13 | 15 |
Feels °C | 10 | 11 | 8 | 8 | 8 | 12 | 12 | 11 | 14 | 15 | 12 | 9 | 10 | 6 | 5 | 5 | 6 | 10 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | N 10 | N 10 | N 9 | — | — | WNW 10 | WNW 9 | W 9 | W 8 | WSW 9 | W 16 | N 9 | N 9 | — | NNW 10 | — | NW 12 | NW 11 | NW 10 | NNW 8 |
131 | 46 | 15 | — | — | 1288 | 766 | 252 | 173 | 277 | 44 | 2 | 2 | — | 62 | — | 3493 | 1594 | 948 | 177 | |
Swell 2 Height (m) Direction Period (s) | W 17 | — | — | — | — | — | — | NNW 8 | NNW 8 | NNW 8 | N 10 | N 10 | N 10 | — | — | — | — | — | — | W 13 |
6 | — | — | — | — | — | — | 59 | 23 | 14 | 2 | 2 | 2 | — | — | — | — | — | — | 3 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | W 13 | N 9 | N 9 | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | 3 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | W 8 | W 10 | WNW 12 | WNW 12 | WNW 12 | — | — | SSE 4 | SE 4 | S 4 | W 10 | W 9 | W 8 | W 10 | WNW 10 | WNW 11 | W 9 | W 9 | — | W 8 |
576 | 1786 | 7649 | 5782 | 3371 | — | — | 20 | 46 | 44 | 824 | 895 | 941 | 1864 | 3204 | 4783 | 951 | 449 | — | 234 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 553 | 269 | 584 | 730 | 233 | 0 | 0 | 11 | 11 | 445 | 283 | 2 | 194 | 2 | 598 | 730 | 581 | 233 | 0 | 11 |
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.










