
Surf Forecasts:
Crab Island surf forecast from 15 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 10PM (local time) - 4.5ft (1.3m), 7s period, W swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 7AM (local time) - 7ft (2.1m), 7s period, WSW swell with 395 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 10PM (local time) - 4.5ft (1.3m), 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 Tuesday (Sep 15) at 10PM. The primary swell is predicted to be 1.3m and 7s 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 2.1m 7s and forecast to arrive on Thursday (Sep 17) at 7AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Sep 16) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Tue 15th Sep) | 4.5ft (1.3m) 7s |
| Best Surf | 10PM (Tue 15th Sep) | 4.5ft (1.3m) 7s |
| Most Powerful | 7AM (Thu 17th Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright, I’m staring at the charts on the wall here at the shop, and I gotta be straight with you… this run for Crab Island is looking pretty tough. The next few days are going to be a frustrating grind, but there might be a few tiny windows if you’re desperate for a paddle.
The whole 16-day outlook starts with a whole lot of "poor surf conditions" slogged out by fresh cross-off and cross-shore winds. For the first several days, from the 15th right through to the 21st, the waves are there but the quality is junk. That combined swell energy is bouncing around between 200 and 475 (moderate wave energy), but it’s mostly short-period 7-second windswell getting chopped up.
The water temp is sitting about average for this time of year.
Thursday the 17th will see a bump up to 6ft from the WSW, also short period, but still, with a moderate cross-off, it’s just messy. That’s probably too much size for beginners with that wind and short period, anyway.
Friday the 18th and Saturday the 19th continue the trend of lumpy, cross-shore chop. Not worth rushing out for.
Now, the real sparkle in this whole outlook, the one true standout, comes on the morning of Wednesday the 16th of September. The swell is 5ft from the West, the period jumps to a nice 10 seconds, giving it some real push. The combined energy hits 371 (moderate wave energy). But the best part? The wind is a clean offshore from the NW at 18 mph. That will groom the reef nicely. It’s fairly consistent here, so expect some sets. Keep in mind, it’s a reef break, and the optimum swell direction is SW, so this W swell should still line up nicely. This is your best shot for a clean session, but it’s still just a 1/10 rating, so it’s marginal—more of a fight to find a good one.
After that, the energy just falls off a cliff. From the 21st of September onward, there’s a massive 9-day gap where the surf drops below 3ft and stays small. The energy drops to "weak", down in the double-digits (20 to 85). There are a couple of moments like the morning of the 22nd of September where it goes glassy with 2ft from the WSW at 10 seconds (energy of 102), and the 25th of September afternoon where it’s glassy with 2ft from the W with a long 13-second period (energy of 130). Those are "surfable but very ordinary" conditions. The 13-second period there could give a clean wrap, but the size is tiny. For a reef, that long period could work well, but you won’t be doing much more than groveling. Those are your only other chances to get wet.
So, the best of a bad bunch is the Wednesday morning, the 16th. For the rest, you’re waiting over a week for tiny, glassy dribbles if you’re that keen. It’s looking flat for the most part. Forecasts can change though, so keep checking back.
Stay salty.
Rusty
Short Range ForecastLight rain (total 8mm), mostly falling on Mon night. Very mild (max 18°C on Mon night, min 13°C on Tue night). Winds increasing (light winds from the WNW on Tue night, fresh winds from the WSW by Wed night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri afternoon. Very mild (max 18°C on Sun afternoon, min 13°C on Thu night). Winds decreasing (fresh winds from the SW on Fri night, calm by Sat night). | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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 7 | W 7 | WSW 7 | W 10 | W 10 | WSW 5 | WSW 7 | W 7 | W 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 8 |
Wave Graph | |||||||||||||||||||||
191 | 208 | 151 | 371 | 340 | 94 | 383 | 277 | 236 | 156 | 128 | 298 | 233 | 227 | 200 | 93 | 128 | 82 | 49 | 38 | 29 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-off | cross-off | cross-off | cross | cross-on | cross | cross-on | cross | cross | cross | cross | glassy | glassy | cross | off |
High Tide | 9:32AM9.11m | 9:45PM8.97m | 10:00AM8.68m | 10:13PM8.45m | 10:28AM8.16m | 10:42PM7.86m | 11:00AM7.58m | 11:19PM7.23m | 11:50AM6.98m | 00:25AM6.64m | 1:30PM6.60m | 2:17AM6.46m | 3:12PM6.83m | 3:50AM6.89m | |||||||
Low Tide | 3:26PM1.54m | 3:42AM1.85m | 3:54PM2.00m | 4:07AM2.35m | 4:23PM2.56m | 4:36AM2.93m | 5:00PM3.19m | 5:15AM3.56m | 6:01PM3.82m | 6:38AM4.13m | 7:56PM4.09m | 8:47AM4.13m | 9:31PM3.73m | ||||||||
6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | |
— | 7:30 | — | — | 7:29 | — | — | 7:27 | — | — | 7:23 | — | — | 7:22 | — | — | 7:20 | — | — | 7:17 | — | |
mm | — | — | — | — | — | 4 | 1 | — | — | — | 1 | — | 1 | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 16 | 16 | 15 | 16 | 16 | 15 | 15 | 16 | 15 | 17 | 17 | 17 | 17 | 17 | 18 | 17 | 18 | 19 | 18 |
Feels °C | 12 | 11 | 13 | 11 | 9 | 10 | 11 | 10 | 10 | 11 | 10 | 13 | 13 | 15 | 15 | 16 | 17 | 18 | 19 | 19 | 18 |
Swell 1 Height (m) Direction Period (s) | W 11 | — | WSW 7 | W 10 | W 10 | W 10 | — | — | W 7 | WSW 7 | W 12 | W 12 | — | — | W 14 | W 9 | — | WSW 7 | WSW 7 | WSW 7 | W 8 |
9 | — | 151 | 371 | 135 | 72 | — | — | 236 | 156 | 12 | 3 | — | — | 4 | 54 | — | 82 | 49 | 38 | 29 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 9 | — | — | — | — | — | W 10 | W 14 | — | W 14 | W 14 | W 14 | — |
— | — | — | — | — | — | — | — | 44 | — | — | — | — | — | 32 | 4 | — | 4 | 4 | 4 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | WSW 7 | W 7 | NW 3 | — | W 10 | WSW 5 | WSW 7 | W 7 | W 7 | — | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | — | — | — | — |
191 | 208 | 2 | — | 340 | 94 | 383 | 277 | 203 | — | 128 | 298 | 233 | 227 | 200 | 93 | 128 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 361 | 361 | 0 | 10 | 179 | 351 | 419 | 361 | 10 | 138 | 320 | 320 | 361 | 144 | 133 | 1 | 64 | 0 | 15 | 121 | 14 |
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.










