Surf Forecasts:
Crab Island surf forecast from 7 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 7AM (local time) - 4ft (1.2m), 8s period, W swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 10PM (local time) - 6ft (1.8m), 12s period, WSW swell with 887 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 7AM (local time) - 4ft (1.2m), 8s 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 Wednesday (Sep 09) at 7AM. The primary swell is predicted to be 1.2m and 8s 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 1.8m 12s and forecast to arrive on Monday (Sep 07) at 10PM. 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 4s period and expected on Wednesday (Sep 09) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Wed 9th Sep) | 4ft (1.2m) 8s |
| Best Surf | 7AM (Wed 9th Sep) | 4ft (1.2m) 8s |
| Most Powerful | 10PM (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 again. Let's break down what's cooking for Crab Island. Gotta be honest, it's looking pretty slim.
Right off the bat, the water is a serious outlier. It's sitting at 67°F right now, which is 6°F warmer than it should be for early September. That's a massive anomaly, so it'll feel like a warm bath, but don't get your hopes up for the waves matching that warmth.
The only real window worth paddling for is the morning of Monday, September 7th. We've got a 5ft swell coming from the WSW with a 14-second period. That's proper groundswell, and it's packing a combined energy of 1234, so there's some real grunt behind it. The wind is a clean cross-off from the WNW at 12 mph. For an intermediate surfer, that's the best combo we see in the whole 16-day run. That WSW direction is exactly what this reef wants to see.
After that morning, it's a long, slow grind down. The rest of that week and well into the next, the swell fades and the wind turns ugly. Tuesday morning still has some size, but the period drops to 9 seconds and the wind is a messy 16 mph from the NW. By Thursday the 10th, you're looking at knee-high junk with onshore wind.
There's one little flicker on the morning of Wednesday, September 16th. The swell is tiny at 2ft, but it's a clean 11-second period from the west with light cross-offshore wind. It'll be glassy, but so small it's hardly worth the effort. The rest of that second week is just howling wind and flat surf.
So the call is easy: Monday morning, September 7th, is your one and only standout. If you miss that, you're looking at two weeks of nothing. That's just how it goes sometimes.
- Rusty
Short Range ForecastModerate rain (total 11mm), heaviest on Mon night. Very mild (max 17°C on Mon morning, min 12°C on Tue night). Winds decreasing (fresh winds from the WNW on Tue afternoon, calm by Wed night). | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Sat night. Very mild (max 18°C on Fri afternoon, min 13°C on Fri night). Winds increasing (calm on Fri night, fresh winds from the SW by Sat night). | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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 14 | WSW 13 | W 12 | WSW 9 | W 9 | W 7 | W 8 | WSW 8 | WSW 8 | WSW 8 | WSW 5 | WSW 5 | WSW 9 | WSW 9 | WSW 8 | WSW 8 | WSW 8 | SW 5 | WSW 7 | WSW 7 | WSW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 926 | 931 | 786 | 366 | 427 | 145 | 134 | 87 | 49 | 32 | 13 | 55 | 249 | 172 | 94 | 45 | 33 | 23 | 178 | 136 | 113 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross-off | cross-off | cross-off | cross-off | cross | glassy | on | cross-on | cross-on | cross-on | cross-off | cross-off | on | cross-on | cross-on | cross | cross | glassy |
High Tide | 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 | 8:32AM9.62m | 8:46PM9.69m | ||||||||
Low Tide | 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 | 2:30PM0.99m | 2:51AM1.13m | ||||||||
 |  |  |  |  |  | | |  | | |  | | | | | | | | | | |
 | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — |
 | — | 7:50 | — | — | 7:47 | — | — | 7:45 | — | — | 7:43 | — | — | 7:40 | — | — | 7:37 | — | — | 7:36 | — |
mm | — | — | 10 | 1 | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | 9 | — | — | — |
Temp °C | 17 | 17 | 15 | 16 | 16 | 15 | 16 | 17 | 14 | 15 | 17 | 17 | 17 | 18 | 15 | 16 | 16 | 17 | 18 | 17 | 15 |
Feels °C | 14 | 12 | 10 | 9 | 9 | 10 | 13 | 14 | 12 | 12 | 13 | 14 | 18 | 18 | 12 | 15 | 13 | 14 | 15 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | — | W 12 | WSW 9 | — | WSW 8 | W 8 | WSW 8 | WSW 8 | WSW 8 | WSW 7 | WSW 10 | WSW 9 | WSW 9 | WSW 8 | WSW 8 | WSW 8 | WSW 8 | WSW 7 | W 13 | WSW 8 |
| kJ | 926 | — | 786 | 366 | — | 57 | 134 | 87 | 49 | 32 | 11 | 19 | 249 | 172 | 94 | 45 | 33 | 19 | 178 | 3 | 113 |
Swell 2 Height (m) Direction Period (s) | WSW 14 | — | — | WSW 10 | — | — | — | — | W 13 | W 12 | W 11 | SW 8 | — | — | — | W 15 | W 16 | WSW 8 | — | — | — |
| kJ | 308 | — | — | 110 | — | — | — | — | 3 | 3 | 2 | 2 | — | — | — | 5 | 5 | 11 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | WSW 13 | — | — | W 9 | W 7 | — | — | — | — | WSW 5 | WSW 5 | — | — | — | — | SW 3 | SW 5 | — | WSW 7 | — |
| kJ | — | 931 | — | — | 427 | 145 | — | — | — | — | 13 | 55 | — | — | — | — | 3 | 23 | — | 136 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 50 | 139 | 133 | 10 | 361 | 1 | 1 | 1 | 15 | 253 | 320 | 133 | 10 | 0 | 0 | 48 | 133 | 133 | 144 | 64 | 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.
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