Surf Forecasts:
Crab Island surf forecast from 25 Aug 2026:
- Best quality surf: Sunday 30 Aug, 4AM (local time) - 4.5ft (1.4m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Sunday 30 Aug, 7AM (local time) - 4.5ft (1.4m), 10s period, WSW swell with 386 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 4AM (local time) - 4.5ft (1.4m), 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 Sunday (Aug 30) at 4AM. The primary swell is predicted to be 1.4m and 9s period with a secondary swell of 0.6m and 11s. 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 1.4m 10s and forecast to arrive on Sunday (Aug 30) at 7AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Thursday (Aug 27) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Sun 30th Aug) | 4.5ft (1.4m) 9s |
| Best Surf | 4AM (Sun 30th Aug) | 4.5ft (1.4m) 9s |
| Most Powerful | 7AM (Sun 30th Aug) | 4.5ft (1.4m) 10s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s cooking for the next couple of weeks.
First up, I gotta be straight with you – it’s a rough start. We’re looking at a solid stretch of quiet, messy conditions for most of the next week or so. There’s pretty much nothing worthwhile until we hit the first few days of September. The swell direction is all over the place, wind is trash, and most of the time the combined energy is pitiful – you’ll see weak numbers like 23 and 11 in the early days. It’s just not happening.
The one and only break worth talking about here is Crab Island. It’s a reef setup, fairly consistent once it gets going, and it likes an optimum swell from the SW. But the whole 16-day window is mostly a bust, with a long gap of zero solid recommendations until September 4th.
The action finally begins to stir on the morning of Friday the 4th of September. We get a clean, cross-off breeze from the WNW, and the swell creeps up to a tiny 3 ft from the W. The energy is still weak (102), but the conditions are clean. It’s surfable, but nothing to get worked up about.
Then, Saturday the 5th of September is the real standout – the best on offer. The morning shows a 8 ft swell from the WSW with a period of 9 seconds, and a clean cross-off wind from the WNW. The combined energy jumps to a solid 938, and by the afternoon it hits a whopping 1451. This is the biggest, most powerful swell in the window, and the wind stays clean. Keep in mind, 8 ft is pushing into expert territory, so it’s not for the beginners. The crowds at Crab Island can sometimes show up, so be ready for that.
After that, Sunday the 6th starts with a 8 ft swell but the wind swings cross-on, making it choppy. The rest of the week goes downhill again with strong, messy winds and poor conditions, despite some decent-sized swells (5 ft to 7 ft) and long periods (11-12 seconds). Those long periods are great for energy, but the onshore wind just ruins it.
The last little glimmer comes on Wednesday the 9th of September. The morning brings a clean, cross-off breeze from the NW and a 4 ft swell from the WSW with a very long 11-second period. The energy is 454 – solid, but manageable. It’s a good, clean option, but by then we’re so far out it’s less certain.
So, bottom line: you’re waiting until the 5th of September for the one big, clean day. It’s a long dry spell, but that Saturday looks like the one to circle. The water temp is a wild 68°F, which is a massive 7°F warmer than normal – that’s very unusual for this time of year, so you’ll be surfing in boardshorts and a rashie no problem.
Rusty.
Short Range ForecastHeavy rain (total 24mm), heaviest during Thu morning. Warm (max 25°C on Tue afternoon, min 16°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 23mm), heaviest during Sun afternoon. Very mild (max 19°C on Sat morning, min 14°C on Sun night). Winds decreasing (strong winds from the SW on Sat afternoon, calm by Sat night). | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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) | E 3 | W 10 | W 9 | W 8 | W 8 | W 7 | W 7 | SW 4 | WSW 6 | WSW 6 | WSW 6 | WSW 6 | SW 7 | WSW 9 | WSW 10 | WSW 9 | WSW 8 | WSW 8 | WSW 8 | WSW 9 |
Wave Graph | ||||||||||||||||||||
5 | 8 | 14 | 12 | 10 | 10 | 4 | 26 | 134 | 104 | 175 | 139 | 374 | 304 | 332 | 188 | 70 | 54 | 51 | 94 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross | cross-off | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-off | on | on | cross-off | cross-off | cross | cross-on |
High Tide | 5:45PM8.16m | 6:07AM8.18m | 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 | |||||||
Low Tide | 11:52PM2.38m | 12:13PM2.23m | 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 | |||||||
— | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | |
8:19 | — | — | 8:15 | — | — | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | |
mm | — | — | — | — | 1 | 19 | 1 | — | 3 | 1 | 5 | 3 | 1 | — | 1 | 10 | 2 | — | — | 2 |
Temp °C | 25 | 19 | 19 | 23 | 20 | 17 | 18 | 17 | 17 | 18 | 17 | 19 | 18 | 17 | 18 | 17 | 16 | 15 | 17 | 17 |
Feels °C | 22 | 19 | 18 | 21 | 19 | 16 | 15 | 15 | 14 | 14 | 15 | 15 | 12 | 12 | 15 | 14 | 12 | 10 | 12 | 11 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 10 | W 9 | W 8 | W 8 | W 7 | W 7 | — | W 8 | SW 8 | W 6 | — | — | WSW 9 | WSW 10 | WSW 9 | WSW 8 | WSW 8 | WSW 8 | WSW 9 |
1 | 8 | 14 | 12 | 10 | 10 | 4 | — | 1 | 9 | 128 | — | — | 304 | 332 | 188 | 70 | 54 | 51 | 94 | |
Swell 2 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | S 4 | — | W 12 | W 9 | W 8 | — | W 9 | — | — | — | — | — | — | — | W 11 | WSW 11 | — |
3 | 3 | 2 | 1 | — | 3 | 2 | 1 | — | 1 | — | — | — | — | — | — | — | 2 | 11 | — | |
Swell 3 Height (m) Direction Period (s) | W 10 | SW 13 | W 13 | SW 7 | S 7 | S 6 | S 7 | SW 9 | — | — | — | — | — | — | — | — | — | — | — | — |
2 | 7 | 3 | 2 | 1 | 1 | 1 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | E 3 | SE 3 | — | — | — | E 3 | — | SW 4 | WSW 6 | WSW 6 | WSW 6 | WSW 6 | SW 7 | — | — | — | — | — | — | — |
5 | 1 | — | — | — | 1 | — | 26 | 134 | 104 | 175 | 139 | 374 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 121 | 20 | 153 | 438 | 335 | 385 | 182 | 133 | 133 | 286 | 133 | 187 | 320 | 139 | 21 | 222 | 361 | 361 | 320 | 148 |
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.











