
Surf Forecasts:
Crab Island surf forecast from 12 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 10PM (local time) - 8ft (2.5m), 13s period, W swell with 2,468 kJ wave energy.
Best Forecast Surf Conditions for Crab Island this week:
The most powerful waves expected at Crab Island in the next 16 days are 2.5m 13s and forecast to arrive on Thursday (Sep 17) at 10PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (IST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Thu 17th Sep) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a proper look at what the next couple of weeks are throwing at us here at Crab Island.
The honest truth is, we’ve got a bit of a rough patch to sit through before it cleans up. The first week and a half is pretty much written off. It’s not a total washout, but the conditions are just plain ugly. We’ve got strong winds and messy surf for days. It’s one of those stretches where you’re better off leaving the boards in the shed.
We start off on Saturday, September 12th with a solid 8ft W swell, but there’s a strong 22 mph cross-onshore wind making a mess of it. The wave energy is pumping (1293), but it’s poor. A bit of a drop in size and wind for Sunday, but it's still cross-onshore and choppy. Monday the 14th sees the swell drop right off.
Things stay in this frustrating cycle of decent size but terrible wind all the way through to the end of the week. By Thursday the 17th, the swell is back up around 8ft from the W, with a period of 10 seconds, and the energy is getting serious (1319), but it’s accompanied by a strong 25 mph onshore wind. That trend continues into the next weekend. The 20th of September looks particularly nasty with an 12ft swell getting hammered by a 28 mph cross-onshore – that’s a washing machine.
For anyone into kite surfing, that Thursday the 17th through to Sunday the 20th would be your window. The wind is strong and cross-onshore, with solid swell, but for a paddle surfer, it’s a no-go.
Now, here’s where it gets interesting. After that long, frustrating gap, we finally get our little window. Monday morning, September 21st, is our first real standout. The swell drops back to a clean 4ft from the WNW, but the wind switches to a light cross-offshore from the SE. The water is a touch warmer than normal for this time of year at 61°, nothing too wild. That morning session should be clean and fun. Tuesday the 22nd is the absolute pick of the bunch. Tuesday morning starts with a 4ft WNW groundswell, and the wind is a glassy 3 mph. It goes near-perfect in the afternoon with glassy conditions. This is the session you wait for. The period is 11-12 seconds, so it’s a proper groundswell with good shape, but it might get a little straight at a beach break. For a reef like Crab Island, it should be lined up nicely. Crowds can be an issue here, so get out early.
We get a couple more clean mornings on the 25th with offshore winds and a small, long-period swell, but between those two golden days and the end of the period, the wind swings around and it gets lumpy again. The last few days of the month show a massive spike in energy (2786) with a long period swell, but it’s pinned by gale-force winds. A real shame.
So, to sum it up: don’t even bother for the first 9 days. Tuesday the 22nd is the one to circle. That’s your winner. The morning of the 21st is also a good bet, and the morning of the 25th is worth a look if you need a fix. It’s a long wait, but it comes good.
Rusty.
Short Range ForecastHeavy rain (total 20mm), heaviest during Mon morning. Very mild (max 18°C on Sun afternoon, min 14°C on Mon night). Winds decreasing (fresh winds from the WSW on Sat morning, light winds from the SW by Sat night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Wed night. Very mild (max 15°C on Tue morning, min 13°C on Tue night). Winds increasing (moderate winds from the WNW on Wed morning, strong winds from the WNW by Wed night). | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 10 | WNW 11 | WSW 10 | WSW 9 | WSW 9 | WSW 9 | WSW 8 | WSW 8 | W 9 | W 10 | W 10 | W 11 | W 10 | W 10 | W 9 | W 10 | W 12 | W 13 | W 13 | W 12 | W 11 |
Wave Graph | |||||||||||||||||||||
1293 | 503 | 378 | 259 | 177 | 161 | 119 | 206 | 445 | 484 | 490 | 1186 | 679 | 544 | 787 | 1319 | 2012 | 2288 | 1631 | 1413 | 1151 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | on | on | cross-on | cross-on | on | on | on | on | on | on | on | cross-on | cross |
High Tide | 6:51PM4.69m | 7:14AM4.49m | 7:27PM4.56m | 7:48AM4.37m | 8:02PM4.33m | 8:21AM4.16m | 8:38PM4.02m | 8:55AM3.90m | 9:15PM3.68m | 9:32AM3.60m | 9:59PM3.33m | 10:19AM3.30m | 10:57PM3.02m | ||||||||
Low Tide | 12:35PM0.08m | 00:57AM-0.12m | 1:10PM0.13m | 1:30AM0.06m | 1:44PM0.28m | 2:02AM0.35m | 2:18PM0.52m | 2:34AM0.69m | 2:52PM0.83m | 3:07AM1.06m | 3:30PM1.18m | 3:44AM1.43m | 4:18PM1.52m | ||||||||
7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — | 7:13 | — | — | 7:15 | — | — | |
— | 8:00 | — | — | 7:59 | — | — | 7:55 | — | — | 7:53 | — | — | 7:52 | — | — | 7:49 | — | — | 7:46 | — | |
mm | — | 1 | — | — | — | — | 11 | 1 | 7 | — | — | — | — | — | 2 | — | — | — | — | — | 3 |
Temp °C | 17 | 16 | 17 | 16 | 18 | 18 | 17 | 17 | 15 | 15 | 15 | 14 | 14 | 15 | 15 | 14 | 14 | 15 | 15 | 15 | 16 |
Feels °C | 12 | 15 | 16 | 15 | 17 | 17 | 14 | 12 | 13 | 10 | 9 | 8 | 10 | 9 | 9 | 6 | 7 | 9 | 10 | 9 | 11 |
Swell 1 Height (m) Direction Period (s) | — | WSW 9 | WSW 10 | WSW 9 | WSW 9 | WNW 9 | WSW 8 | W 11 | — | — | — | — | W 10 | — | — | — | — | — | W 13 | — | — |
— | 391 | 378 | 259 | 177 | 33 | 119 | 86 | — | — | — | — | 679 | — | — | — | — | — | 1631 | — | — | |
Swell 2 Height (m) Direction Period (s) | — | WNW 11 | WNW 12 | WNW 11 | WNW 10 | — | WNW 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | 503 | 256 | 133 | 88 | — | 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | W 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | W 10 | — | — | — | — | WSW 9 | S 3 | WSW 8 | W 9 | W 10 | W 10 | W 11 | — | W 10 | W 9 | W 10 | W 12 | W 13 | — | W 12 | W 11 |
1293 | — | — | — | — | 161 | 2 | 206 | 445 | 484 | 490 | 1186 | — | 544 | 787 | 1319 | 2012 | 2288 | — | 1413 | 1151 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 97 | 67 | 67 | 16 | 115 | 117 | 16 | 97 | 97 | 353 | 384 | 384 | 291 | 304 | 565 | 596 | 617 | 97 | 97 | 97 | 97 |
Best forecast wave conditions in Clare | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Crab Island Surf forecast
The above surf forecast table for Crab Island provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Crab Island can be found by selecting the local surf guide option on the grey menu. Our Crab Island 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 (Crab Island) 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 Crab Island 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.
Are you planning a holiday in Clare? If you are looking for accommodation near Crab Island, camping, hotels and holiday cottages in Clare, consider staying in Galway which is 35 km (22 miles) away. Other places in and around Clare where you can find information about places to rent, and car hire include Inis which is 35 km (22 miles) away, Shannon, Foynes and Limerick.










