
Surf Forecasts:
Crab Island surf forecast from 12 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 10PM (local time) - 2.5ft (0.7m), 9s period, WSW swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 10AM (local time) - 3ft (0.9m), 10s period, WSW swell with 149 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. The wind is predicted to be 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 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 0.9m 4s period and expected on Saturday (Aug 15) at 7PM.
| 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 | 10AM (Thu 13th Aug) | 3ft (0.9m) 10s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
G’day, Rusty here. Look, I’m gonna level with ya – it’s a tough stretch ahead for Crab Island. This is a south-west facing reef break, and the next sixteen days are looking pretty grim for a proper surf. We’ve got a long, quiet spell right off the bat, so don’t bother paddling out for a while.
The water is sitting at 69°, which is much warmer than usual for this time of year – that’s a hell of a anomaly. But warm water doesn’t make up for the lack of waves.
For the first few days, it’s all small and messy. Wednesday the 12th has 2 ft swell from the WSW at 10 seconds, but with a cross-on ESE breeze at 12 mph, it’s choppy and poor. The combined energy is only 60 – that’s weak. Thursday the 13th is not much better: 3 ft swell but still cross-shore winds and a combined energy of 149, which is still not enough to overcome the crummy conditions. Friday the 14th drops off to 2 ft and less energy (84). The pattern continues through the weekend with tiny surf, and by Monday the 17th it’s barely a ripple at 0.7 ft.
We hit a bit of a spike on Tuesday the 18th. The swell jumps to 5 ft from the WSW, but the period is only 6 seconds – that’s short-period slop. The winds are a fresh cross-onshore at 22 mph, making it lumpy and ugly. Combined energy hits 156 (moderate), but with that wind and short period, it’s not worth your time for a surf. Honestly, that setup looks more interesting for kite surfing than paddle surfing.
Wednesday the 19th gives us the best of a bad bunch. Morning sees a 3 ft swell from the west with a 7-second period, but the wind swings offshore from the NNW at 12 mph. It’s the first time the forecast calls for “surfable waves but very ordinary conditions” with a score of 1 out of 10, so that’s the standout, if you can even call it that. The wind will keep it clean, but the energy is only 81, so don’t expect much push. It’s a brief window before it goes flat again.
After that, the rest of the month is a washout. There’s a little bump of 4 ft on Thursday the 27th from the west at 6 seconds, but the cross-on wind and combined energy of 115 still isn’t enough to save it. Conditions stay poor.
So, if you’re desperate, the only window worth even a look is the morning of Wednesday the 19th of August – it’s not good, but it’s the cleanest of a bad lot. For the rest, you’re better off keeping the board in the shed. Forecasts can change, but right now, Crab Island is a no-go.
Rusty.
Short Range ForecastMostly dry. Warm (max 32°C on Wed afternoon, min 15°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Mon night. Warm (max 20°C on Sun afternoon, min 13°C on Sat night). Winds increasing (calm on Sun night, fresh winds from the WSW by Mon night). | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 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) | WSW 10 | WSW 10 | WSW 9 | WSW 10 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 8 | WSW 8 | W 8 | WSW 8 | WSW 7 | WSW 7 | WSW 7 | W 7 | W 7 | W 8 | WSW 6 | W 7 | W 7 |
Wave Graph | |||||||||||||||||||||
58 | 74 | 94 | 149 | 133 | 98 | 84 | 45 | 33 | 22 | 41 | 19 | 11 | 10 | 5 | 4 | 4 | 7 | 141 | 134 | 89 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-off | cross | cross | cross-off | cross | cross-off | off | off | cross-off | off | off | cross-off | off | on | cross | cross-on | cross-on | cross-off | cross-off |
High Tide | 7:08PM9.53m | 7:37AM9.48m | 7:55PM9.82m | 8:21AM9.64m | 8:38PM9.89m | 9:01AM9.60m | 9:16PM9.76m | 9:37AM9.39m | 9:51PM9.46m | 10:10AM9.04m | 10:23PM9.02m | 10:41AM8.59m | 10:55PM8.48m | ||||||||
Low Tide | 12:53PM1.33m | 1:26AM1.04m | 1:41PM1.00m | 2:12AM0.82m | 2:23PM0.87m | 2:52AM0.81m | 3:01PM0.92m | 3:27AM0.99m | 3:34PM1.13m | 3:57AM1.32m | 4:04PM1.48m | 4:25AM1.75m | 4:35PM1.94m | ||||||||
5:54 | — | — | 5:56 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | |
— | 8:45 | — | — | 8:43 | — | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — |
Temp °C | 27 | 32 | 26 | 25 | 26 | 20 | 20 | 21 | 17 | 18 | 18 | 15 | 19 | 20 | 16 | 16 | 17 | 18 | 18 | 19 | 19 |
Feels °C | 23 | 28 | 26 | 22 | 23 | 20 | 18 | 19 | 14 | 13 | 12 | 10 | 15 | 14 | 12 | 15 | 14 | 15 | 14 | 16 | 18 |
Swell 1 Height (m) Direction Period (s) | WSW 10 | WSW 10 | WSW 9 | WSW 10 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 6 | WSW 8 | W 8 | WSW 8 | WSW 7 | WSW 7 | WSW 7 | W 7 | W 5 | W 8 | W 8 | W 7 | W 7 |
58 | 74 | 94 | 149 | 133 | 98 | 84 | 45 | 26 | 22 | 41 | 19 | 11 | 10 | 5 | 4 | 2 | 5 | 10 | 134 | 89 | |
Swell 2 Height (m) Direction Period (s) | SW 6 | — | — | — | — | — | — | — | W 8 | WSW 7 | — | NW 4 | — | — | WNW 4 | — | W 7 | — | W 17 | SW 17 | SW 17 |
1 | — | — | — | — | — | — | — | 33 | 5 | — | 7 | — | — | 2 | — | 4 | — | 5 | 11 | 12 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 11 | W 10 | — | — | — | — | W 5 | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | 2 | 7 | — | — | — | — | 2 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 2 | SE 3 | — | — | — | W 4 | — | — | NW 3 | NNW 4 | NW 4 | NNW 4 | NNW 4 | NW 4 | N 4 | ESE 2 | — | WSW 3 | WSW 6 | — | — |
1 | 1 | — | — | — | 2 | — | — | 3 | 5 | 17 | 12 | 5 | 9 | 3 | 1 | — | 7 | 141 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 45 | 21 | 0 | 1 | 361 | 0 | 1 | 361 | 0 | 397 | 412 | 395 | 412 | 448 | 275 | 351 | 367 | 351 | 849 | 903 | 1 |
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.











