Surf Forecasts:
Crab Island surf forecast from 28 Aug 2026:
- Most powerful swell: Monday 31 Aug, 7AM (local time) - 6.5ft (2.0m), 9s period, WSW swell with 673 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 2.0m 9s and forecast to arrive on Monday (Aug 31) at 7AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Saturday (Aug 29) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Mon 31st Aug) | 6.5ft (2.0m) 9s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright, let me break this down for you in feet and knots. This is Rusty, lookin’ at Crab Island.
The water temp is 69°F right now, which is a wild 8°F warmer than average. It feels like a hot tub out there.
We start on Friday the 28th of August. Swell is about 5ft from the WSW, but it’s a short 6-second period, and there’s a fresh 19 knot cross-onshore wind. It’s lumpy and weak. Don’t bother. Saturday is smaller at 3ft with onshore winds. Sunday bumps up to 5ft with a better 9-second period, but the wind is a strong 22 knots straight onshore. It’s a mess.
The first real chance comes Monday the 31st of August. Swell is 6ft from the WSW, period is 9 seconds, and the wind goes light cross-offshore. The energy is moderate (978). It’s clean, but it’s only rated as marginal. Still, it’s the best of the first week.
Then we get a long dry patch. From Tuesday the 1st to Sunday the 6th of September, it’s all cross-onshore winds, lumpy water, and weak, short-period swell. There’s a day on Friday the 4th with 6ft swell and clean conditions, but with a 22 knot cross-offshore breeze, it’s probably blown out.
Now, Tuesday the 8th of September is a different beast. We’ve got a WSW groundswell coming in at 15ft with a very long 11-second period. The energy is a massive 5011. The wind is clean cross-offshore. But that’s 15ft on a reef. That’s for experts only. The forecast says it’s too big for this break. It’s a spectacle.
Wednesday the 9th of September is the one for everyone else. The swell drops to 4ft with a nice 9-second period and light winds. The energy is moderate (225) and the forecast is good. It’s clean, it’s surfable, and it’s the most user-friendly day in the whole 16-day outlook.
The rest of the run from the 10th to the 12th is just small, onshore slop.
So, the bottom line: the first week is a waste. The 8th of September is a monster for the brave, but Wednesday the 9th of September is your best bet for a clean, fun session. Otherwise, it’s a long wait.
Rusty.
Short Range ForecastHeavy rain (total 36mm), heaviest during Sat morning. Very mild (max 18°C on Fri afternoon, min 15°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Wed morning. Very mild (max 18°C on Wed morning, min 15°C on Mon night). Winds increasing (light winds from the W on Mon night, strong winds from the SW by Wed morning). | |||||||||||||||||||
Fri 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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 6 | SW 6 | SW 6 | SW 7 | WSW 10 | WSW 9 | WSW 8 | WSW 8 | WSW 9 | WSW 9 | WSW 10 | WSW 9 | WSW 6 | WSW 6 | WSW 6 | SW 6 | WSW 7 | WSW 7 | WSW 8 | WSW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 119 | 83 | 51 | 82 | 394 | 273 | 315 | 512 | 533 | 409 | 235 | 166 | 43 | 55 | 72 | 165 | 387 | 228 | 176 | 186 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross | on | on | cross-off | cross-off | cross-off | cross | cross | cross | cross-on | cross-on | cross-on | cross | cross | cross | cross |
High Tide | 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 | 10:01AM8.93m | 10:23PM8.83m | 10:38AM8.51m | 11:04PM8.29m | |||||||
Low Tide | 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 | 3:57PM1.70m | 4:20AM1.90m | 4:35PM2.16m | ||||||||
 |  |  |  | | | |  |  | |  |  | | |  | | | | | | |
 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — |
 | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | — | 8:00 | — | — | 7:59 | — |
mm | 1 | 5 | 12 | — | 2 | 3 | 5 | 8 | — | — | — | — | 1 | 2 | 3 | 1 | 1 | 1 | 1 | — |
Temp °C | 18 | 17 | 18 | 18 | 17 | 18 | 17 | 16 | 15 | 16 | 16 | 17 | 17 | 17 | 18 | 18 | 18 | 17 | 17 | 17 |
Feels °C | 14 | 14 | 14 | 17 | 15 | 15 | 13 | 12 | 11 | 13 | 14 | 14 | 13 | 15 | 12 | 13 | 13 | 11 | 10 | 11 |
Swell 1 Height (m) Direction Period (s) | — | WSW 6 | SW 6 | SW 7 | WSW 10 | WSW 9 | WSW 8 | WSW 8 | WSW 9 | — | WSW 10 | W 9 | W 9 | W 8 | SW 16 | W 16 | W 15 | SW 15 | SW 15 | SW 15 |
| kJ | — | 46 | 51 | 82 | 394 | 273 | 227 | 422 | 533 | — | 235 | 99 | 13 | 6 | 10 | 5 | 4 | 8 | 9 | 9 |
Swell 2 Height (m) Direction Period (s) | — | — | — | SSE 3 | — | — | — | — | — | — | — | — | W 18 | SW 16 | W 16 | — | — | — | — | SW 15 |
| kJ | — | — | — | 1 | — | — | — | — | — | — | — | — | 6 | 10 | 5 | — | — | — | — | 9 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | W 16 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 6 | SW 6 | SE 3 | — | — | — | WSW 8 | WSW 8 | W 9 | WSW 9 | — | WSW 9 | WSW 6 | WSW 6 | WSW 6 | SW 6 | WSW 7 | WSW 7 | WSW 8 | WSW 8 |
| kJ | 119 | 83 | 5 | — | — | — | 315 | 512 | 445 | 409 | — | 166 | 43 | 55 | 72 | 165 | 387 | 228 | 176 | 186 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 273 | 393 | 393 | 49 | 139 | 68 | 68 | 50 | 10 | 49 | 1 | 148 | 308 | 133 | 431 | 775 | 279 | 900 | 361 | 279 |
Best forecast wave conditions in Wales - Gower | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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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