Surf Forecasts:
Crab Island surf forecast from 9 Sep 2026:
- Best quality surf: Friday 11 Sep, 7AM (local time) - 5ft (1.5m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Friday 11 Sep, 1AM (local time) - 6ft (1.8m), 9s period, WSW swell with 528 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 1PM (local time) - 3.5ft (1.0m), 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 1PM. The primary swell is predicted to be 1.0m 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 9s and forecast to arrive on Friday (Sep 11) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 6s period and expected on Wednesday (Sep 09) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Wed 9th Sep) | 3.5ft (1.0m) 8s |
| Best Surf | 7AM (Fri 11th Sep) | 5ft (1.5m) 9s |
| Most Powerful | 1AM (Fri 11th Sep) | 6ft (1.8m) 9s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s cooking at Crab Island.
To be straight with you, the next couple of days are a bit of a write-off. We’ve got a bit of swell showing on Tuesday afternoon, 5 ft from the west, but it’s packing a 22 mph cross-offshore wind that’s just making a mess of things. The water’s sitting at a very unusual 66°, a full 5° warmer than normal for this time of year, which is a wild anomaly. The combined energy is moderate at 431, but the conditions are poor. Wednesday morning is a little cleaner with a 4 ft west swell and a gentler 9 mph cross-off, but it’s still not offering much quality. We’re in a patch of rough, choppy water until we get a real window.
The standout window is Friday, September 11th. That morning is the best we’re going to see. The wind is a clean 9 mph cross-offshore from the northwest, grooming a 4 ft swell from the west-southwest. The period is a solid 9 seconds, giving it some shape and energy. The combined energy hits 271, which is moderate but punchy. The waves will be clean. Crowds are possible at this spot, but it’s a reef break, so it handles a longer period swell well. The direction is a good match for the optimum SW. This is your session.
Friday afternoon sees the wind pick up and go cross-shore, which will mess up the surface. Saturday and Sunday are a mix of choppy cross-onshore winds and messy conditions, with the swell dropping off. Monday is tiny, but Tuesday the 15th offers a couple of glassy moments with some small 2 ft waves. The combined energy is weak at 76 and 68, but for a small wave cruiser session, the glassy morning and afternoon will be clean. The wind is dead calm, so it’ll be a nice paddle.
After that, the swell fades into the second week. From the 16th onward, we’re looking at very small, weak surf with periods of onshore wind. There’s a tiny spike of 2 ft on the 22nd with a 10-second period and light winds, but the energy is weak at 112. It’s surfable but not worth a special trip. The long-range window on the 23rd shows a 14-second period, but the swell is only 1.0 ft, which is too small to do anything with.
In short, don’t waste your time until Friday morning. That’s the one to go for.
Stay salty,
Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Thu afternoon. Very mild (max 18°C on Thu night, min 13°C on Tue night). Winds increasing (light winds from the W on Wed night, strong winds from the SW by Thu afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Mon morning, min 12°C on Fri night). Winds increasing (calm on Fri night, fresh winds from the SW by Sat afternoon). | |||||||||||||||||||
Tue 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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 9 | W 7 | W 8 | WSW 8 | WSW 8 | WSW 8 | WSW 6 | WSW 9 | WSW 9 | WSW 9 | WSW 8 | WSW 8 | WSW 6 | W 8 | WSW 7 | WSW 9 | WSW 9 | WSW 9 | WSW 8 | WSW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 431 | 246 | 190 | 109 | 49 | 19 | 164 | 528 | 271 | 169 | 99 | 171 | 280 | 237 | 125 | 143 | 106 | 79 | 99 | 70 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross | on | cross-on | cross | cross-off | cross | glassy | cross-on | cross-on | cross | cross-off | cross-on | cross-on | on | cross-on | cross |
High Tide | 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 | 9:03AM9.43m | 9:17PM9.39m | |||||||
Low Tide | 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 | 2:58PM1.20m | 3:16AM1.44m | |||||||
 |  |  |  | | |  | | | |  | | | | | | | | | | |
 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — | 6:48 | — | — |
 | 7:47 | — | — | 7:45 | — | — | 7:43 | — | — | 7:40 | — | — | 7:37 | — | — | 7:36 | — | — | 7:34 | — |
mm | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 14 | 15 | 14 | 17 | 17 | 18 | 17 | 17 | 14 | 17 | 17 | 17 | 17 | 17 | 17 | 21 | 21 | 18 |
Feels °C | 9 | 10 | 10 | 12 | 12 | 12 | 11 | 16 | 14 | 14 | 12 | 12 | 11 | 13 | 16 | 15 | 18 | 21 | 19 | 18 |
Swell 1 Height (m) Direction Period (s) | — | — | W 8 | WSW 8 | WSW 8 | WSW 8 | W 11 | WSW 9 | WSW 9 | WSW 9 | WSW 8 | W 8 | W 15 | W 8 | WSW 7 | WSW 9 | WSW 9 | WSW 9 | W 8 | WSW 8 |
| kJ | — | — | 190 | 109 | 49 | 19 | 2 | 528 | 271 | 169 | 99 | 48 | 4 | 217 | 125 | 143 | 106 | 79 | 36 | 70 |
Swell 2 Height (m) Direction Period (s) | — | — | — | W 8 | W 13 | W 12 | — | — | — | — | — | W 15 | — | — | — | W 13 | — | — | — | WSW 8 |
| kJ | — | — | — | 34 | 3 | 3 | — | — | — | — | — | 4 | — | — | — | 3 | — | — | — | 13 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 9 | W 7 | — | W 6 | — | SW 4 | WSW 6 | — | — | — | — | WSW 8 | WSW 6 | WSW 7 | — | — | — | — | WSW 8 | — |
| kJ | 431 | 246 | — | 32 | — | 19 | 164 | — | — | — | — | 171 | 280 | 237 | — | — | — | — | 99 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 361 | 151 | 64 | 1 | 48 | 364 | 320 | 50 | 0 | 49 | 0 | 133 | 319 | 283 | 0 | 64 | 48 | 21 | 182 | 1 |
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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