Surf Forecasts:
Crab Island surf forecast from 8 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 10PM (local time) - 2.5ft (0.7m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Thursday 13 Aug, 1PM (local time) - 3ft (0.9m), 10s period, WSW swell with 146 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 10PM (local time) - 2.5ft (0.7m), 9s period with WSW swell.
Best Forecast Surf Conditions for Crab Island this week:
The surf forecast for Crab Island over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 12) at 10PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.2m and 3s. Another secondary swell of 0.2m and 3s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Crab Island in the next 16 days are 0.9m 10s and forecast to arrive on Thursday (Aug 13) at 1PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Friday (Aug 14) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Wed 12th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 10PM (Wed 12th Aug) | 2.5ft (0.7m) 9s |
| Most Powerful | 1PM (Thu 13th Aug) | 3ft (0.9m) 10s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s in store for Crab Island.
The next couple of weeks are looking pretty quiet, with a lot of small, weak, and often messy surf. Honestly, there’s a big gap of nothing worth paddling out for until we get to the 18th of August. For the first nine days, the waves are tiny, mostly under 2ft, with rubbish energy. The wind is all over the place, chopping things up. It’s just not happening.
However, there is a real stand-out that’s worth waiting for. The morning of Tuesday the 18th of August is the moment. The swell bumps up to a clean 6ft, coming from the WSW, with a light offshore breeze. The energy jumps right up to 390 (moderate wave energy), which is a big step up from the flat spell. The shape should be good, with that clean cross-offshore wind. It's a solid intermediate-level wave, but anyone getting in the water will be rewarded. The glassy conditions on the morning of the 13th of August are a tease, but the swell is just too small at 3ft to get excited about.
The afternoon of the 18th also has 6ft of swell, but the wind picks up to a moderate breeze, making it a bit less clean. And just a heads up, the 19th drops off again quickly. For the rest of the week after that, we’re back to small, choppy, and mixed conditions with onshore winds. The 21st and 22nd have some waist-high sets, but the wind is all wrong, creating a cross-chop.
The standout: Hit the Tuesday morning session on the 18th of August. That’s the only real window of decent, clean surf in the whole two weeks.
Rusty
Short Range ForecastMostly dry. Warm (max 24°C on Mon afternoon, min 14°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Wed afternoon, min 16°C on Tue night). Winds decreasing (fresh winds from the ESE on Wed morning, calm by Wed night). | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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 9 | W 9 | WSW 7 | WSW 7 | W 8 | W 3 | WSW 6 | W 5 | WSW 7 | ESE 3 | W 10 | WSW 11 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | WSW 10 | WSW 10 | WSW 9 | W 9 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2 | 2 | 5 | 4 | 2 | 1 | 4 | 4 | 4 | 4 | 7 | 25 | 58 | 74 | 84 | 88 | 102 | 120 | 84 | 39 | 33 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | off | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross | cross-on | cross-on | glassy | glassy | cross | cross-off | cross-off | cross-off | off |
High Tide | 2:26PM7.40m | 3:17AM7.49m | 3:58PM7.72m | 4:41AM7.93m | 5:13PM8.36m | 5:50AM8.55m | 6:15PM9.02m | 6:47AM9.10m | 7:08PM9.53m | 7:37AM9.48m | 7:55PM9.82m | 8:21AM9.64m | 8:38PM9.89m | ||||||||
Low Tide | 7:54AM3.09m | 8:47PM3.09m | 9:32AM2.97m | 10:18PM2.69m | 10:52AM2.46m | 11:32PM2.07m | 11:58AM1.85m | 00:33AM1.47m | 12:53PM1.33m | 1:26AM1.04m | 1:41PM1.00m | 2:12AM0.82m | 2:23PM0.87m | 2:52AM0.81m | |||||||
 | |  |  | | |  | | | | | | | | | | | | | | | |
 | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:58 | — | — |
 | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — | — | 8:46 | — | — | 8:45 | — | — | 8:43 | — | — | 8:40 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 21 | 19 | 20 | 20 | 18 | 21 | 24 | 22 | 23 | 28 | 23 | 26 | 29 | 24 | 25 | 27 | 20 | 21 | 21 | 16 |
Feels °C | 18 | 19 | 16 | 17 | 16 | 17 | 19 | 20 | 18 | 19 | 25 | 21 | 21 | 25 | 22 | 22 | 23 | 18 | 18 | 16 | 13 |
Swell 1 Height (m) Direction Period (s) | W 9 | W 9 | WSW 7 | WSW 7 | SW 6 | W 3 | W 4 | WSW 6 | WSW 7 | SW 7 | W 10 | WSW 11 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | WSW 10 | WSW 10 | WSW 9 | W 9 | W 8 |
| kJ | 2 | 2 | 5 | 4 | 2 | 1 | 3 | 4 | 4 | 2 | 7 | 25 | 58 | 74 | 84 | 88 | 102 | 120 | 84 | 39 | 33 |
Swell 2 Height (m) Direction Period (s) | — | SW 8 | W 9 | W 8 | W 8 | SW 6 | WSW 6 | W 8 | W 4 | W 8 | SW 6 | W 9 | W 6 | W 6 | WSW 3 | WSW 11 | — | — | — | — | — |
| kJ | — | 2 | 2 | 1 | 1 | 1 | 4 | 1 | 1 | 1 | 2 | 2 | 1 | 1 | 1 | 24 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 8 | W 8 | W 8 | — | W 10 | W 13 | SW 6 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 1 | 1 | 1 | — | 2 | 3 | 1 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | WSW 2 | WNW 3 | — | W 5 | — | ESE 3 | SE 3 | SE 3 | ESE 3 | SE 3 | — | — | WSW 2 | NNW 3 | — | W 5 | NNW 3 |
| kJ | — | — | — | — | 1 | 2 | — | 4 | — | 4 | 2 | 4 | 9 | 5 | — | — | 1 | 1 | — | 18 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 325 | 325 | 190 | 190 | 360 | 190 | 135 | 190 | 190 | 393 | 361 | 20 | 45 | 20 | 0 | 0 | 137 | 1 | 1 | 412 | 73 |
Best forecast wave conditions in Wales - Gower | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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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.
Crab Island is 8 km (5 miles) from Swansea. If you plan a holiday in Wales - Gower, look for hotels and other accommodation in Swansea. Swansea has rooms for a wide range of budgets as well as car hire and transport links.
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