
Surf Forecasts:
Crab Island surf forecast from 9 Sep 2026:
- Best quality surf: Friday 11 Sep, 4AM (local time) - 5ft (1.5m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Thursday 10 Sep, 10PM (local time) - 6ft (1.9m), 9s period, W swell with 567 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 1AM (local time) - 2.5ft (0.7m), 8s 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 Thursday (Sep 10) at 1AM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.1m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Crab Island in the next 16 days are 2.0m 8s and forecast to arrive on Thursday (Sep 10) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Tuesday (Sep 15) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Thu 10th Sep) | 2.5ft (0.7m) 8s |
| Best Surf | 4AM (Fri 11th Sep) | 5ft (1.5m) 9s |
| Most Powerful | 10PM (Thu 10th Sep) | 6ft (1.9m) 9s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright, let’s get into it. This is Rusty, and I’m looking at the next couple of weeks for Crab Island. It’s a reef break, and it’s fairly consistent, but man, we’ve got a lot of chop to wade through before we get to the good stuff. The water is sitting at 67°, which is a whopping 6° warmer than usual – that’s a really unusual anomaly for this time of year, so you won’t need a thick winter suit.
The week starts slow. Wednesday afternoon (9th September) is a write-off with a weak 3ft WSW swell and cross-shore wind. Thursday (10th) is even worse, with a messy 3ft south-west swell that’s only 5 seconds of period and a strong cross-onshore breeze – it’s choppy and lumpy. Not worth a paddle.
Then things flip. Friday morning (11th September) is your first real shot. The wind goes light and cross-offshore from the NW, and the sea cleans right up. The swell is 4ft from the WSW with a 9-second period, and the energy is moderate at 271. It’s clean, it’s fun, and it’s the best on offer in the first week. Saturday (12th) and Sunday (13th) mornings are a mixed bag – Sunday morning actually looks clean again with a light NW breeze and a 3ft WSW swell, but the afternoon wind picks up.
There’s a real gap from Monday (14th) through to Wednesday (16th) where things get messy or very small. Thursday (17th) has a clean morning with offshore wind and a 3ft swell, but the energy is low and the period is short – it’s surfable but ordinary.
Now, hold on. The standout is hiding at the end of the forecast. The morning of Sunday the 20th of September is the real gem. The wind is light and cross-offshore from the WNW, the sky is clear, and the swell is a solid 7ft from the west with an 8-second period. The combined energy is a very strong 609, so there’s plenty of power. That’s a big, clean, powerful wave at Crab Island. It’s an intermediate break, so anything over 8ft is for experts only, but this 7ft is right on the money for experienced surfers. The water is much warmer than usual, and the conditions are clean. That’s your best bet. Sunday afternoon the wind turns cross and it gets chopped, so get it early.
The following week drops off again. Monday (21st) is blown out by a fresh cross-on wind, and Tuesday (22nd) morning has a small clean window with offshore wind but only a 4ft swell. The glassy afternoon on Tuesday is a nice bonus, but the swell is small.
Overall, it’s a week of waiting for that Sunday the 20th. That’s the one to circle on the calendar. Everything else is average or blown out.
Rusty.
Short Range ForecastSome drizzle, heaviest during Thu afternoon. Very mild (max 18°C on Thu night, min 13°C on Wed night). Winds increasing (calm on Wed night, fresh winds from the SW by Thu afternoon). | Days 5-7 Weather SummarySome drizzle, heaviest during Sun night. Very mild (max 19°C on Mon morning, min 16°C on Sat night). Winds decreasing (fresh winds from the SW on Sat afternoon, light winds from the NNW by Sun morning). | |||||||||||||||||||
Wed 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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 8 | WSW 8 | SW 5 | WSW 7 | W 10 | WSW 9 | WSW 9 | WSW 8 | WSW 6 | WSW 7 | WSW 7 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 9 | WSW 6 | WSW 7 | W 7 | W 8 |
Wave Graph | ||||||||||||||||||||
87 | 65 | 32 | 288 | 485 | 271 | 169 | 90 | 119 | 268 | 245 | 209 | 157 | 90 | 64 | 57 | 59 | 99 | 81 | 108 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross-on | cross-on | cross | cross-off | cross | cross-on | cross-on | cross-on | cross | cross-off | cross | cross-on | cross-on | cross-on | on | on | cross | off |
High Tide | 6:07PM9.17m | 6:36AM9.24m | 6:54PM9.63m | 7:20AM9.57m | 7:36PM9.85m | 7:58AM9.68m | 8:13PM9.85m | 8:32AM9.62m | 8:46PM9.69m | 9:03AM9.43m | 9:17PM9.39m | 9:32AM9.11m | 9:45PM8.97m | |||||||
Low Tide | 00:27AM1.35m | 12:42PM1.26m | 1:11AM0.99m | 1:23PM0.98m | 1:50AM0.87m | 1:58PM0.91m | 2:22AM0.93m | 2:30PM0.99m | 2:51AM1.13m | 2:58PM1.20m | 3:16AM1.44m | 3:26PM1.54m | 3:42AM1.85m | |||||||
— | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — | 6:48 | — | — | 6:48 | — | — | |
7:45 | — | — | 7:43 | — | — | 7:40 | — | — | 7:37 | — | — | 7:36 | — | — | 7:34 | — | — | 7:30 | — | |
mm | — | — | — | 1 | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 16 | 14 | 17 | 17 | 18 | 17 | 17 | 16 | 17 | 18 | 17 | 18 | 18 | 17 | 19 | 19 | 18 | 19 | 19 | 17 |
Feels °C | 13 | 11 | 12 | 11 | 15 | 15 | 14 | 13 | 13 | 15 | 14 | 18 | 16 | 16 | 18 | 18 | 18 | 19 | 18 | 13 |
Swell 1 Height (m) Direction Period (s) | WSW 8 | WSW 8 | WSW 8 | W 11 | W 10 | WSW 9 | WSW 9 | WSW 8 | W 8 | — | W 7 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 9 | WSW 6 | WSW 7 | W 7 | W 8 |
87 | 65 | 19 | 2 | 460 | 271 | 169 | 90 | 33 | — | 212 | 209 | 157 | 90 | 64 | 57 | 59 | 99 | 81 | 108 | |
Swell 2 Height (m) Direction Period (s) | W 8 | W 13 | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 8 | W 11 | — | W 8 |
49 | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | 14 | 2 | — | 34 | |
Swell 3 Height (m) Direction Period (s) | — | — | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | SW 5 | WSW 7 | WSW 9 | — | — | SW 3 | WSW 6 | WSW 7 | WSW 7 | — | — | — | — | WSW 4 | — | — | — | NNW 4 |
— | — | 32 | 288 | 485 | — | — | 1 | 119 | 268 | 245 | — | — | — | — | 10 | — | — | — | 7 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1 | 0 | 364 | 308 | 50 | 0 | 64 | 102 | 133 | 320 | 141 | 0 | 49 | 21 | 133 | 133 | 21 | 18 | 1 | 0 |
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.










