Surf Forecasts:
Crab Island surf forecast from 26 Aug 2026:
- Best quality surf: Wednesday 2 Sep, 4AM (local time) - 2.5ft (0.7m), 7s period, WSW swell with cross-offshore winds.
- Most powerful swell: Monday 31 Aug, 10AM (local time) - 7.5ft (2.3m), 9s period, WSW swell with 863 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 4AM (local time) - 2.5ft (0.7m), 7s 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 (Sep 02) at 4AM. The primary swell is predicted to be 0.7m and 7s period with a secondary swell of 0.1m and 16s. 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 2.3m 9s and forecast to arrive on Monday (Aug 31) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 3s period and expected on Thursday (Aug 27) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Wed 2nd Sep) | 2.5ft (0.7m) 7s |
| Best Surf | 4AM (Wed 2nd Sep) | 2.5ft (0.7m) 7s |
| Most Powerful | 10AM (Mon 31st Aug) | 7.5ft (2.3m) 9s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's talk about what's happening at Crab Island.
Right off the bat, I gotta be straight with you folks – the next week and a half is looking pretty grim for a proper paddle. For the first few days, from the 26th to the 30th of August, we’re dealing with small, weak, wind-affected junk. The swell is barely a ripple, coming in at 1ft to 5ft, with periods under 9 seconds, and the wind is mostly cross-on or onshore, making things choppy and lumpy. It’s a write-off for a surf. The water temperature is sitting at 68°F, which is a whole 7°F warmer than usual for this time of year – that’s a very unusual anomaly, so you might not even need a spring suit, but trust me, you won’t want to be out there for the waves.
We do have a bit of a gap before anything looks surfable. The first real flicker of hope comes on the morning of Monday, the 31st of August. We’ll see a jump in swell to 8ft from the WSW, with a period of 9 seconds, and the wind goes cross-offshore from the WNW. The combined energy hits 863 (moderate wave energy). It’s described as "clean," but the call is still only marginal. The swell is getting a bit sizeable, over 5ft, so it’s pushing into intermediate territory, and the short period means it’ll be a bit lumpy. Keep an eye on it.
The real standout, the one that’s got my heart beating a little faster, is looking like the morning of Saturday, the 5th of September. The sun’s out, the wind is glassy – that’s a 3 mph glass-off from the WSW – and we’ve got a solid 7ft of WSW swell. The period is still short at 7 seconds, but the energy is a healthy 394 (moderate wave energy). The conditions are called "good surf conditions." This is the one to circle on your calendar. It’s a week away, so don’t hold me to the exact minute, but the setup is promising. The swell is pushing 7ft, so it’s getting into the expert zone, and Crab Island is a reef, so that bigger, punchy stuff will be fun for the right crowd. The break is fairly consistent, but fair warning – it can get crowded here sometimes. The optimum swell direction is SW, and this swell is coming from the WSW, so it’s a solid match.
Beyond that, the 7th of September morning looks possible with a 4ft and glassy conditions, but it’s nothing to write home about. The rest of the second week fades back into small, windy slop. No other standouts.
So, to sum it up: sit tight, wait out the wind and the small stuff, and get ready for that Saturday the 5th morning. It’s the only real window of quality on the horizon.
Rusty.
Short Range ForecastHeavy rain (total 28mm), heaviest during Fri morning. Warm (max 23°C on Wed afternoon, min 16°C on Fri morning). Winds increasing (light winds from the SSW on Thu morning, fresh winds from the WSW by Fri morning). | Days 5-7 Weather SummaryHeavy rain (total 28mm), heaviest during Sun afternoon. Very mild (max 18°C on Sat afternoon, min 15°C on Sun night). Mainly strong winds. | |||||||||||||||||||
Wed 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | ||||||||||||||
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 8 | W 7 | W 7 | SW 4 | WSW 7 | WSW 7 | WSW 7 | SW 6 | SW 7 | WSW 10 | WSW 9 | WSW 9 | WSW 8 | WSW 9 | WSW 10 | WSW 7 | WSW 7 | W 7 | WSW 7 |
Wave Graph | ||||||||||||||||||||
12 | 10 | 10 | 4 | 14 | 326 | 344 | 241 | 116 | 125 | 701 | 293 | 300 | 441 | 863 | 683 | 375 | 208 | 155 | 73 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-off | cross-on | cross-on | cross | cross-off | cross | cross | cross-off | cross | cross-off |
High Tide | 6:26PM8.66m | 6:45AM8.62m | 7:02PM9.05m | 7:20AM8.96m | 7:36PM9.33m | 7:53AM9.20m | 8:09PM9.52m | 8:25AM9.34m | 8:42PM9.58m | 8:57AM9.36m | 9:15PM9.49m | 9:28AM9.22m | 9:48PM9.24m | |||||||
Low Tide | 00:32AM1.92m | 12:49PM1.83m | 1:08AM1.55m | 1:22PM1.53m | 1:41AM1.29m | 1:53PM1.31m | 2:12AM1.13m | 2:23PM1.21m | 2:43AM1.09m | 2:54PM1.23m | 3:14AM1.21m | 3:24PM1.39m | 3:45AM1.48m | |||||||
— | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | |
8:15 | — | — | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | |
mm | — | 2 | 3 | 1 | 2 | 9 | 2 | 4 | 5 | 3 | — | 2 | 12 | 3 | — | — | 8 | — | — | — |
Temp °C | 23 | 21 | 19 | 20 | 17 | 16 | 18 | 17 | 18 | 18 | 16 | 18 | 16 | 16 | 16 | 17 | 16 | 16 | 17 | 16 |
Feels °C | 20 | 19 | 19 | 18 | 15 | 10 | 14 | 15 | 15 | 14 | 10 | 15 | 13 | 11 | 12 | 12 | 11 | 12 | 12 | 13 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 7 | W 7 | W 7 | — | — | — | W 6 | SW 7 | WSW 10 | WSW 9 | — | WSW 8 | — | — | W 7 | W 9 | — | WSW 7 |
12 | 10 | 10 | 4 | 4 | — | — | — | 51 | 125 | 701 | 293 | — | 240 | — | — | 236 | 27 | — | 73 | |
Swell 2 Height (m) Direction Period (s) | SW 7 | SW 7 | SW 5 | SW 7 | W 9 | — | — | — | — | — | — | — | — | — | — | — | W 9 | — | — | SW 16 |
2 | 2 | 1 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | 85 | — | — | 10 | |
Swell 3 Height (m) Direction Period (s) | — | W 12 | W 12 | — | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | 3 | 3 | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | SE 2 | ESE 3 | — | SW 4 | WSW 7 | WSW 7 | WSW 7 | SW 6 | WSW 7 | — | — | WSW 9 | WSW 8 | WSW 9 | WSW 10 | WSW 7 | WSW 7 | W 7 | — |
— | 1 | 3 | — | 14 | 326 | 344 | 241 | 116 | 99 | — | — | 300 | 441 | 863 | 683 | 375 | 208 | 155 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 402 | 395 | 395 | 183 | 152 | 144 | 308 | 112 | 183 | 320 | 50 | 68 | 103 | 50 | 279 | 320 | 584 | 49 | 308 | 80 |
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.











