Surf Forecasts:
Crab Island surf forecast from 4 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, 4PM (local time) - 6ft (1.8m), 13s period, WSW swell with 993 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 0.4m and 9s. 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 13s and forecast to arrive on Monday (Sep 07) at 4PM. 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 4s period and expected on Friday (Sep 11) at 1PM.
| 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 | 4PM (Mon 7th Sep) | 6ft (1.8m) 13s |
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 the next couple weeks at Crab Island. Straight up, this is a tough run. The forecast is a real mixed bag of junk and maybe, with only a couple of brief windows that might get your heart rate up.
Right now, there’s a punchy, but sloppy, swell. Friday morning (Sept 4) we’ve got a 6ft swell from the WSW, but it’s getting hammered by a 22 mph cross-shore wind. The water’s sitting at a very unusual 68°F, which is a whopping 7°F warmer than normal for this time of year. The combined energy is moderate (505), but the conditions are just plain poor. That afternoon and into Saturday morning, the swell drops off fast, and things stay messy.
The first real glimmer of hope comes on Monday morning (Sept 7). A 5ft swell from the west, with a long 11-second period, under clean cross-offshore winds. The combined energy is up there (732), and the clean conditions will make it look a lot better than it has been. This is a genuine groundswell pulse, so expect some nice lines. This is for the intermediate crew; the size is manageable.
Tuesday morning (Sept 8) is another one to watch, but you’ll need to be game. The swell pushes up to 7ft from the WSW, still with clean cross-offshore wind. The energy is strong (588). That’s getting into "experts only" territory, especially with the short 8-second period, which will make it a bit crumbly and powerful. Not for the faint of heart.
After that, it’s a real desert. The swell drops off a cliff, and the wind stays on it or cross-shore for days. From Wednesday the 9th all the way through to the end of the run, it’s a long stretch of poor surf conditions. You’ll see small waves, but it’s constantly blown out, lumpy, or just plain small. There’s a brief moment on Saturday morning (Sept 12) with a tiny 2ft south-west swell and clean offshore winds from the north, but it’s just not enough to get excited about.
So, the call: If you’re desperate, make the most of Monday morning (Sept 7). That’s your best bet. Tuesday morning (Sept 8) for the experts who want a challenge. The rest of the fortnight? Take the dog for a walk, or tune your board. The ocean isn’t giving us much.
Rusty.
Short Range ForecastSome drizzle, heaviest during Fri morning. Warm (max 23°C on Sun afternoon, min 14°C on Fri night). Winds decreasing (fresh winds from the W on Fri morning, calm by Sat night). | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Wed night. Very mild (max 18°C on Wed night, min 14°C on Tue night). Winds increasing (light winds from the WNW on Mon morning, strong winds from the SW by Wed night). | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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 8 | WSW 8 | WSW 7 | WSW 7 | WSW 7 | WSW 9 | W 6 | WSW 6 | WSW 8 | W 11 | WSW 13 | WSW 8 | WSW 8 | W 7 | W 8 | W 7 | WSW 7 | WSW 6 | WSW 8 | WSW 8 | WSW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 497 | 373 | 203 | 73 | 69 | 68 | 28 | 43 | 116 | 525 | 993 | 661 | 588 | 522 | 424 | 239 | 161 | 184 | 523 | 460 | 432 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross-off | cross-on | cross-on | cross-on | on | cross-on | cross-off | cross-on | cross | cross-off | cross | cross-off | cross | cross-on | cross-on | cross | cross | cross-off |
High Tide | 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 | 5:45AM8.68m | 6:07PM9.17m | 6:36AM9.24m | 6:54PM9.63m | ||||||||
Low Tide | 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 | 11:54AM1.77m | 00:27AM1.35m | 12:42PM1.26m | 1:11AM0.99m | ||||||||
 |  |  | | |  | |  | | | |  |  | | | | | | | | | |
 | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — |
 | — | 7:57 | — | — | 7:53 | — | — | 7:52 | — | — | 7:50 | — | — | 7:47 | — | — | 7:45 | — | — | 7:43 | — |
mm | 1 | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | 1 | 7 | — | — | — |
Temp °C | 17 | 17 | 16 | 15 | 16 | 15 | 20 | 23 | 18 | 17 | 17 | 16 | 15 | 16 | 15 | 16 | 17 | 18 | 19 | 18 | 17 |
Feels °C | 12 | 11 | 11 | 14 | 13 | 14 | 17 | 22 | 16 | 12 | 12 | 9 | 9 | 10 | 10 | 11 | 11 | 15 | 16 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 14 | WSW 7 | WSW 7 | WSW 9 | W 6 | WSW 6 | SW 17 | WSW 14 | — | WSW 11 | — | — | — | — | — | — | — | — | — |
| kJ | 8 | 8 | 8 | 73 | 69 | 68 | 28 | 43 | 12 | 207 | — | 173 | — | — | — | — | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | W 16 | WSW 8 | SW 14 | SW 13 | SW 13 | SSE 2 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 5 | 55 | 7 | 7 | 7 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | W 14 | SW 14 | — | — | — | SW 13 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 4 | 8 | — | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 8 | WSW 8 | WSW 7 | — | WSW 6 | — | SE 2 | — | WSW 8 | W 11 | WSW 13 | WSW 8 | WSW 8 | W 7 | W 8 | W 7 | WSW 7 | WSW 6 | WSW 8 | WSW 8 | WSW 8 |
| kJ | 497 | 373 | 203 | — | 28 | — | 1 | — | 116 | 525 | 993 | 661 | 588 | 522 | 424 | 239 | 161 | 184 | 523 | 460 | 432 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 116 | 361 | 49 | 0 | 112 | 13 | 59 | 182 | 133 | 279 | 139 | 50 | 361 | 361 | 361 | 224 | 348 | 279 | 50 | 144 | 10 |
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.
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