Surf Forecasts:
Crab Island surf forecast from 2 Sep 2026:
- Best quality surf: Saturday 5 Sep, 7AM (local time) - 3.5ft (1.1m), 7s period, W swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 7PM (local time) - 6ft (1.8m), 12s period, WSW swell with 928 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 7AM (local time) - 3.5ft (1.1m), 7s period with W 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 Saturday (Sep 05) at 7AM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.1m and 14s. 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 1.8m 12s and forecast to arrive on Monday (Sep 07) at 7PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sat 5th Sep) | 3.5ft (1.1m) 7s |
| Best Surf | 7AM (Sat 5th Sep) | 3.5ft (1.1m) 7s |
| Most Powerful | 7PM (Mon 7th Sep) | 6ft (1.8m) 12s |
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 Crab Island.
Honestly, mate, this forecast is a bit of a tough one. The first ten days are a real struggle with sloppy, onshore conditions and poor surf quality. There's a massive gap of nothing but junk until we finally get a glimmer of hope near the end of the window. The only real standout is a single window on the very last day of the forecast.
The action, such as it is, starts on Wednesday the 2nd with a weak 3ft swell from the WSW, but the 16 mph South wind is straight onshore and messy. Combined swell energy is a pathetic 80. It's a write-off. The next few days are much of the same – strong winds, cross-onshore chop, and poor conditions. The swell bumps up to 6ft on the 2nd afternoon, but with a fresh 22 mph cross-onshore, it's a bumpy, lumpy mess. The energy hits 306, but it's useless.
We get a bit of a cleaner window on the morning of Friday the 4th. Swell is a solid 6ft from the WSW, and the wind is a cross-offshore breeze. The energy is moderate at 347, and the forecast calls it "clean." It's a *marginal* call, but it's the best we've seen so far. The Saturday morning after that is only 3ft from the W, but with a light 3 mph cross-offshore, it's clean and rideable, though very ordinary. The energy is a weak 104.
Then things go flat. From Sunday the 6th right through to the 16th, it's a long stretch of tiny, weak waves, mostly under 3ft, with a lot of onshore wind. The water temperature is about average for the time of year here.
Now, for the standout. You have to wait until the very end of the period. On Wednesday the 17th of September, the morning looks like a goer. Swell is a clean 4ft from the WSW, with a period of 11 seconds, giving it a bit of groundswell punch. The wind is a glassy 3 mph from the ENE. The combined energy is a solid 353. The forecast says "expect good surf conditions." This is the one to circle. The 4ft swell is perfect for intermediate surfers, and with glassy conditions, it will be clean. Because it's a long period groundswell, the reef bottom at Crab Island will handle it far better than a beach break, giving you proper, well-shaped lines. The crowds are listed as "sometimes", so you might have a few others in the water, but it's worth it.
Any of the other days... just not worth paddling out for. If you're a kite surfer, the days with significant swell and strong onshore wind might be more your bag, but for paddle surfing, it's a waiting game for the 17th.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Thu night. Very mild (max 19°C on Wed afternoon, min 16°C on Tue night). Winds increasing (light winds from the SW on Tue night, strong winds from the SW by Thu night). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Sun afternoon, min 12°C on Fri night). Winds increasing (calm on Sat night, fresh winds from the W by Mon afternoon). | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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) | WSW 6 | WSW 7 | WSW 7 | WSW 8 | WSW 7 | WSW 7 | WSW 8 | W 8 | W 6 | W 7 | WSW 6 | WSW 9 | W 9 | WSW 8 | WSW 8 | WSW 13 | WSW 12 | W 8 | WSW 10 | WSW 10 | WSW 9 |
Wave Graph | |||||||||||||||||||||
65 | 306 | 344 | 214 | 249 | 326 | 335 | 294 | 120 | 92 | 56 | 65 | 40 | 24 | 51 | 384 | 807 | 258 | 295 | 197 | 113 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross | cross-off | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-off | cross | cross | cross | cross-on | cross-on |
High Tide | 10:01AM8.93m | 10:23PM8.83m | 10:38AM8.51m | 11:04PM8.29m | 11:24AM7.96m | 00:02AM7.65m | 12:36PM7.40m | 1:34AM7.19m | 2:22PM7.24m | 3:19AM7.32m | 3:58PM7.71m | 4:43AM7.95m | 5:11PM8.48m | ||||||||
Low Tide | 3:57PM1.70m | 4:20AM1.90m | 4:35PM2.16m | 5:02AM2.45m | 5:26PM2.76m | 6:02AM3.09m | 6:51PM3.32m | 7:47AM3.49m | 8:54PM3.32m | 9:37AM3.19m | 10:26PM2.71m | 10:56AM2.48m | 11:34PM1.96m | ||||||||
6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — | 6:37 | — | — | |
— | 8:00 | — | — | 7:59 | — | — | 7:57 | — | — | 7:53 | — | — | 7:52 | — | — | 7:50 | — | — | 7:47 | — | |
mm | 2 | 1 | — | — | — | 5 | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 3 | 17 |
Temp °C | 17 | 19 | 19 | 19 | 18 | 18 | 17 | 17 | 16 | 14 | 15 | 14 | 19 | 22 | 19 | 17 | 16 | 17 | 17 | 17 | 16 |
Feels °C | 13 | 15 | 17 | 16 | 14 | 15 | 12 | 12 | 12 | 11 | 12 | 13 | 15 | 18 | 17 | 13 | 11 | 12 | 12 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 16 | — | W 15 | SW 15 | SW 16 | — | SW 15 | SW 14 | W 8 | W 7 | SW 13 | WSW 9 | W 9 | WSW 8 | WSW 8 | WSW 13 | — | W 8 | WSW 10 | WSW 10 | WSW 9 |
10 | — | 4 | 8 | 9 | — | 8 | 8 | 37 | 92 | 7 | 65 | 40 | 24 | 51 | 384 | — | 258 | 295 | 197 | 113 | |
Swell 2 Height (m) Direction Period (s) | W 16 | — | — | — | — | — | W 15 | — | SW 14 | SW 14 | W 14 | SW 13 | SW 13 | SW 13 | WSW 16 | — | — | WSW 11 | — | — | — |
5 | — | — | — | — | — | 4 | — | 8 | 8 | 4 | 7 | 7 | 6 | 26 | — | — | 164 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | W 14 | — | — | — | — | W 12 | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | 4 | — | — | — | — | 3 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | WSW 6 | WSW 7 | WSW 7 | WSW 8 | WSW 7 | WSW 7 | WSW 8 | W 8 | W 6 | — | WSW 6 | — | — | SE 2 | — | SW 4 | WSW 12 | — | — | — | — |
65 | 306 | 344 | 214 | 249 | 326 | 335 | 294 | 120 | — | 56 | — | — | 1 | — | 7 | 807 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 416 | 320 | 148 | 133 | 308 | 176 | 49 | 340 | 49 | 0 | 155 | 14 | 102 | 20 | 97 | 10 | 178 | 139 | 144 | 222 | 25 |
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.











