
Surf Forecasts:
Crab Island surf forecast from 6 Sep 2026:
- Best quality surf: Friday 11 Sep, 10AM (local time) - 4.5ft (1.3m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 1AM (local time) - 6ft (1.9m), 12s period, WSW swell with 966 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 10AM (local time) - 4.5ft (1.3m), 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 Friday (Sep 11) at 10AM. The primary swell is predicted to be 1.3m and 9s period. 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 1.9m 12s and forecast to arrive on Tuesday (Sep 08) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Fri 11th Sep) | 4.5ft (1.3m) 9s |
| Best Surf | 10AM (Fri 11th Sep) | 4.5ft (1.3m) 9s |
| Most Powerful | 1AM (Tue 8th Sep) | 6ft (1.9m) 12s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's cookin' for Crab Island over the next couple of weeks.
Honestly, it's a bit of a tough stretch ahead. The forecast is lookin' pretty bleak for the most part, with a lot of cross-onshore wind and messy conditions. The water is notably warm though, at 67°, which is much warmer than normal for this time of year – a full 6° above average, so you might not even need a spring suit if you're tough enough.
We've got a small window of something half-decent comin' up, but you'll have to be patient. For the first few days, from Sunday the 6th right through the week, it's just one poor report after another. Tiny waves, wrong wind, or blown-out chop. It's a real write-off.
The first real glimmer of hope shows up on Monday, September 7th in the morning. A clean, cross-offshore breeze from the WNW will groom a 5ft swell from the WSW. Now, this one has some serious grunt behind it – the combined wave energy is a massive 1234 (strong to very strong). The period is a very long 14 seconds, so this is proper groundswell. That long period might make it a bit straight at a beach break, but being a reef, Crab Island could handle it nicely. The afternoon goes a bit lumpy though.
Then the next morning, Tuesday, September 8th, looks clean again early with a cross-off breeze and a similar 5ft swell, but the period drops to 8 seconds and the energy is much weaker at 408 (moderate). Still, a clean 5ft wave is surfable.
After that, we're back into a long stretch of rubbish. It's not until Friday, September 11th in the morning that we get another clean look. A gentle cross-off breeze with a 4ft swell from the WSW. The energy is moderate (249) and the 9-second period is alright. It's not a standout, but it's the best of a bad bunch.
Looking way out, the second week is a total desert. From the 12th right through to the 21st, it's just tiny, windy, or onshore junk. The combined energy is almost always under 100 (weak). There is a final blip on Monday, September 21st in the afternoon, where a 7ft swell from the WSW shows up with moderate energy (450), but the wind is a messy cross-shore, and the report still says poor. For that size, 7ft is getting solid for a reef, but the quality just isn't there.
So, the pick of the litter is Monday morning, September 7th. That long-period, clean 5ft groundswell with a cross-off breeze is the only time everything really lines up. It's a proper session if you can make it. For the rest? Keep your board in the car and your fingers crossed the forecasts change.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Mon night. Warm (max 23°C on Sun afternoon, min 13°C on Mon night). Winds increasing (light winds from the SSE on Sun afternoon, fresh winds from the SW by Mon night). | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Wed night. Very mild (max 19°C on Fri morning, min 14°C on Wed morning). Winds decreasing (fresh winds from the SW on Thu morning, light winds from the W by Fri night). | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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) | W 6 | WSW 6 | WSW 6 | WSW 14 | WSW 13 | WSW 12 | WSW 8 | W 9 | W 7 | W 8 | WSW 8 | WSW 8 | WSW 6 | WSW 7 | WSW 9 | WSW 9 | WSW 9 | WSW 8 | WSW 6 | WSW 7 | WSW 8 |
Wave Graph | |||||||||||||||||||||
19 | 45 | 56 | 926 | 931 | 966 | 308 | 452 | 312 | 229 | 67 | 89 | 93 | 299 | 388 | 249 | 137 | 75 | 145 | 244 | 245 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-off | cross | cross-on | cross-off | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-off | cross | cross-on | on | cross-on | cross-on |
High Tide | 2:22PM7.24m | 3:19AM7.32m | 3:58PM7.71m | 4:43AM7.95m | 5:11PM8.48m | 5:45AM8.68m | 6:07PM9.17m | 6:36AM9.24m | 6:54PM9.63m | 7:20AM9.57m | 7:36PM9.85m | 7:58AM9.68m | 8:13PM9.85m | ||||||||
Low Tide | 8:54PM3.32m | 9:37AM3.19m | 10:26PM2.71m | 10:56AM2.48m | 11:34PM1.96m | 11:54AM1.77m | 00:27AM1.35m | 12:42PM1.26m | 1:11AM0.99m | 1:23PM0.98m | 1:50AM0.87m | 1:58PM0.91m | 2:22AM0.93m | ||||||||
6:35 | — | — | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | |
— | 7:52 | — | — | 7:50 | — | — | 7:47 | — | — | 7:45 | — | — | 7:43 | — | — | 7:40 | — | — | 7:37 | — | |
mm | — | — | — | — | — | 13 | — | — | — | — | — | 2 | 1 | 2 | 3 | 1 | — | — | 1 | 2 | 2 |
Temp °C | 21 | 23 | 18 | 17 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 16 | 17 | 18 | 17 | 19 | 19 | 16 | 18 | 18 | 18 |
Feels °C | 19 | 22 | 17 | 12 | 13 | 12 | 9 | 8 | 8 | 11 | 11 | 12 | 12 | 15 | 14 | 16 | 15 | 15 | 14 | 15 | 17 |
Swell 1 Height (m) Direction Period (s) | W 6 | WSW 6 | WSW 17 | WSW 14 | W 13 | — | WSW 9 | — | — | W 8 | WSW 8 | W 13 | W 12 | W 11 | W 9 | WSW 9 | WSW 9 | WSW 8 | — | — | WSW 8 |
19 | 45 | 28 | 926 | 848 | — | 100 | — | — | 229 | 67 | 3 | 3 | 2 | 318 | 249 | 137 | 75 | — | — | 245 | |
Swell 2 Height (m) Direction Period (s) | WSW 9 | SW 13 | — | WSW 14 | — | — | — | — | — | — | — | W 13 | W 12 | W 11 | — | — | — | — | — | — | — |
16 | 6 | — | 308 | — | — | — | — | — | — | — | 3 | 3 | 2 | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | SW 13 | — | — | — | — | — | — | — | — | — | — | W 13 | — | — | — | — | — | — | — | — | — |
7 | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SE 2 | SSE 2 | WSW 6 | — | WSW 13 | WSW 12 | WSW 8 | W 9 | W 7 | — | W 6 | WSW 8 | WSW 6 | WSW 7 | WSW 9 | — | — | — | WSW 6 | WSW 7 | — |
1 | 1 | 56 | — | 931 | 966 | 308 | 452 | 312 | — | 49 | 89 | 93 | 299 | 388 | — | — | — | 145 | 244 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 48 | 182 | 133 | 10 | 139 | 308 | 151 | 361 | 361 | 10 | 133 | 119 | 416 | 320 | 133 | 0 | 119 | 21 | 133 | 133 | 133 |
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.










