
Surf Forecasts:
Crab Island surf forecast from 4 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 4PM (local time) - 5ft (1.6m), 7s period, WSW swell with 261 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 1.6m 7s and forecast to arrive on Wednesday (Aug 05) at 4PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Sunday (Aug 09) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Wed 5th Aug) | 5ft (1.6m) 7s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
G’day, Rusty here.
I’ll be straight with you – the next couple of weeks at Crab Island are a total washout for anyone hoping to get a decent paddle. There’s not a single slot in these 16 days that I’d call good, let alone great. The whole window is a long, flat, choppy mess.
The first real chance of anything rideable doesn’t show up until Thursday the 13th of August, and even then it’s barely worth the effort. That morning we’ve got 4ft of WSW swell with a short period of 8 seconds – not much push behind it. The combined swell energy is moderate at 181, but the wind’s glassy, so it’ll be clean. Problem is, the water’s a whopping 4° warmer than usual – 68° – which is pretty wild for this time of year. The waves are surfable, but the quality is ordinary. Not something to get excited about.
A couple of days later, Saturday the 15th of August morning, is the other faint flicker. Same story – 4ft WSW swell, 8-second period, 176 combined energy. The wind is light and cross-off, so it’ll look clean enough, but again it’s just ordinary conditions.
Apart from those two glimmers, the rest of the forecast is nothing but small, weak, and chopped-out junk. Winds are mostly cross, cross-on, or strong, and the swell never gets above 5ft – but that day (Wednesday the 5th) has a fresh cross-breeze that makes it a lumpy mess. The combined energy tops out at 261 that afternoon, but with 19 mph cross-winds and a short 7-second period, it’s not surfable.
Crab Island itself is a reef break that’s fairly consistent and exposed to SW swell, which is the optimum direction – so the setup’s right. But with such poor surf quality across the board, there’s nothing doing. You’d have better luck on a kiteboard when that wind gets up, especially the Wednesday and Thursday afternoons with strong cross-shore breeze.
Stay patient. It’s a long blank run, but forecasts can change.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Tue morning, min 13°C on Wed night). Winds decreasing (fresh winds from the W on Wed morning, calm by Thu night). | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Sun afternoon, min 14°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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 7 | SW 7 | WSW 6 | WSW 7 | WSW 7 | W 6 | W 6 | WSW 6 | W 5 | W 9 | WSW 5 | WSW 4 | W 9 | W 4 | W 5 | WSW 7 | WSW 7 | W 6 | W 5 | W 6 | W 5 |
Wave Graph | |||||||||||||||||||||
138 | 119 | 106 | 173 | 261 | 115 | 81 | 56 | 14 | 7 | 8 | 6 | 2 | 3 | 7 | 49 | 60 | 27 | 21 | 22 | 4 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross | cross-off | cross-on | cross | cross-off | glassy | cross | cross-off | cross | cross | cross-off | off | cross-on | cross-off |
High Tide | 10:28AM8.65m | 10:49PM8.70m | 11:05AM8.34m | 11:30PM8.31m | 11:51AM7.95m | 00:25AM7.86m | 12:55PM7.55m | 1:42AM7.49m | 2:26PM7.40m | 3:17AM7.49m | 3:58PM7.72m | 4:41AM7.93m | 5:13PM8.36m | ||||||||
Low Tide | 4:23PM1.85m | 4:49AM1.92m | 5:02PM2.18m | 5:31AM2.32m | 5:52PM2.60m | 6:29AM2.77m | 7:06PM3.01m | 7:54AM3.09m | 8:47PM3.09m | 9:32AM2.97m | 10:18PM2.69m | 10:52AM2.46m | 11:32PM2.07m | ||||||||
5:43 | — | — | 5:43 | — | — | 5:46 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | |
— | — | 9:00 | — | 8:58 | — | — | 8:55 | — | — | 8:53 | — | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 19 | 18 | 16 | 17 | 17 | 16 | 16 | 15 | 18 | 18 | 16 | 17 | 18 | 16 | 19 | 20 | 18 | 21 | 22 | 19 |
Feels °C | 17 | 17 | 16 | 10 | 11 | 12 | 11 | 10 | 12 | 15 | 15 | 14 | 15 | 15 | 15 | 16 | 18 | 17 | 18 | 17 | 16 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | W 11 | W 10 | — | W 5 | WSW 5 | W 9 | WSW 4 | W 4 | W 9 | W 5 | WSW 7 | — | W 6 | W 5 | — | W 5 |
— | — | — | — | — | 2 | 2 | — | 14 | 5 | 6 | 6 | 1 | 2 | 7 | 49 | — | 27 | 21 | — | 4 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | W 13 | W 13 | — | W 10 | W 9 | — | W 9 | W 9 | — | WSW 8 | — | — | — | — | — | N 3 |
— | — | — | — | — | 3 | 3 | — | 7 | 7 | — | 2 | 2 | — | 7 | — | — | — | — | — | 1 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 12 | W 12 | — | W 12 | — | — | — | — | — | — | — | — | WSW 7 |
— | — | — | — | — | — | — | — | 6 | 3 | — | 3 | — | — | — | — | — | — | — | — | 4 | |
Wind waves Height (m) Direction Period (s) | WSW 7 | SW 7 | WSW 6 | WSW 7 | WSW 7 | W 6 | W 6 | WSW 6 | — | — | WSW 5 | — | — | W 4 | — | — | WSW 7 | — | NNW 3 | W 6 | — |
138 | 119 | 106 | 173 | 261 | 115 | 81 | 56 | — | — | 8 | — | — | 3 | — | — | 60 | — | 1 | 22 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 133 | 351 | 283 | 361 | 361 | 320 | 206 | 386 | 348 | 349 | 351 | 364 | 427 | 206 | 135 | 20 | 1432 | 19 | 191 | 395 | 190 |
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.











