
Surf Forecasts:
Crab Island surf forecast from 11 Aug 2026:
- Best quality surf: Thursday 13 Aug, 1AM (local time) - 2.5ft (0.7m), 9s period, WSW swell with glassy winds.
- Most powerful swell: Thursday 13 Aug, 4PM (local time) - 3.5ft (1.1m), 10s period, WSW swell with 255 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 1AM (local time) - 2.5ft (0.7m), 9s period with WSW 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 Thursday (Aug 13) at 1AM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.2m and 3s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Crab Island in the next 16 days are 1.1m 10s and forecast to arrive on Thursday (Aug 13) at 4PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Saturday (Aug 15) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Thu 13th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 1AM (Thu 13th Aug) | 2.5ft (0.7m) 9s |
| Most Powerful | 4PM (Thu 13th Aug) | 3.5ft (1.1m) 10s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Hey, Rusty here. Gotta level with you – Crab Island is lookin’ pretty darn quiet over this stretch. This reef break ain’t got much goin’ on for the first chunk. From Tuesday the 11th, it’s all tiny swell, cross-onshore wind, and wave energy barely tickin’ over (10 to 75). There’s a long dry spell right through to the first real usable wave.
Thursday morning the 13th is our best shot. Swell comes in at 0.9m from the WSW, period about 10 seconds, with a clean cross-off northwest wind. Combined energy is moderate at 158, so there’s some weight. The swell direction is close to the preferred SW, so the reef will shape up some fun, head-high waves. Good for intermediate surfers, and crowds might pop up sometimes, but early morning you could have it to yourself.
Friday morning the 14th has another tidy window – 0.7m from the west, 9-second period, light cross-off wind. Energy drops to 79, so it’s weaker, but still clean and rideable for a small-wave session.
After that, we sink back into flatness. Saturday the 15th is glassy but tiny – 0.6m with a short 6-second period, energy at 45 – more like ankle slappers. Sunday the 16th is glassy at 0.3m with next to no energy (11). Monday and Tuesday stay glassy and flat.
Now into the second week, Friday the 21st picks up – 1.6m from the west in the morning, period around 7 seconds, but the wind is cross-onshore from the southeast, so it’s messy and choppy. Energy is 240 (moderate). That afternoon, swell jumps to 1.9m from the WSW with light cross-shore wind – it’s got some push (energy 357) but the short period makes it lumpy and hard. This is expert-only size, and it’s not clean.
Saturday the 22nd morning drops to 1.4m with light cross-shore breeze, energy at 239 – still some power but the period is short. Not a standout.
The clear winner here is Thursday morning the 13th. That 0.9m WSW swell, 10-second period, clean cross-off breeze, and moderate energy (158) gives you the best quality waves of the whole 16 days. It’s not big, but it’s lined up right for the reef, and with crowds only sometimes, you could score some clean, fun rides. Water temp’s about average for this time of year.
Rusty.
Short Range ForecastMostly dry. Warm (max 31°C on Wed afternoon, min 16°C on Mon night). Winds increasing (calm on Wed night, fresh winds from the W by Thu afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Fri afternoon, min 13°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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) | W 8 | W 10 | WSW 11 | WSW 10 | WSW 10 | WSW 9 | WSW 10 | WSW 10 | WSW 10 | W 9 | W 9 | WSW 8 | W 6 | W 7 | W 8 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 7 | W 8 |
Wave Graph | |||||||||||||||||||||
5 | 7 | 25 | 58 | 74 | 86 | 158 | 255 | 98 | 79 | 181 | 87 | 23 | 40 | 29 | 11 | 18 | 5 | 5 | 4 | 12 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | glassy | cross-off | cross | cross-off | cross-off | cross | off | cross-off | cross-off | off | glassy | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 5:50AM8.55m | 6:15PM9.02m | 6:47AM9.10m | 7:08PM9.53m | 7:37AM9.48m | 7:55PM9.82m | 8:21AM9.64m | 8:38PM9.89m | 9:01AM9.60m | 9:16PM9.76m | 9:37AM9.39m | 9:51PM9.46m | 10:10AM9.04m | 10:23PM9.02m | |||||||
Low Tide | 11:58AM1.85m | 00:33AM1.47m | 12:53PM1.33m | 1:26AM1.04m | 1:41PM1.00m | 2:12AM0.82m | 2:23PM0.87m | 2:52AM0.81m | 3:01PM0.92m | 3:27AM0.99m | 3:34PM1.13m | 3:57AM1.32m | 4:04PM1.48m | ||||||||
5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:03 | — | — | |
— | 8:46 | — | — | 8:45 | — | — | 8:43 | — | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 26 | 23 | 27 | 31 | 25 | 27 | 24 | 19 | 19 | 22 | 17 | 20 | 22 | 15 | 18 | 19 | 17 | 21 | 24 | 21 |
Feels °C | 22 | 24 | 22 | 23 | 28 | 24 | 25 | 20 | 19 | 18 | 18 | 14 | 16 | 17 | 10 | 17 | 16 | 13 | 16 | 20 | 16 |
Swell 1 Height (m) Direction Period (s) | SW 6 | W 10 | WSW 11 | WSW 10 | WSW 10 | WSW 9 | WSW 10 | — | WSW 10 | W 9 | — | WSW 8 | W 6 | W 7 | W 8 | WSW 7 | WSW 7 | W 4 | WSW 7 | W 7 | W 8 |
2 | 7 | 25 | 58 | 74 | 86 | 158 | — | 98 | 79 | — | 87 | 23 | 40 | 29 | 11 | 18 | 3 | 5 | 4 | 12 | |
Swell 2 Height (m) Direction Period (s) | W 8 | SW 6 | W 9 | SW 6 | — | S 3 | — | — | — | — | — | — | WSW 8 | — | W 4 | — | — | WSW 7 | — | — | — |
5 | 2 | 2 | 1 | — | 1 | — | — | — | — | — | — | 20 | — | 4 | — | — | 5 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | W 10 | W 13 | SW 6 | — | — | — | — | — | — | — | — | — | W 10 | — | WNW 5 | — | — | — | — | — | — |
2 | 3 | 1 | — | — | — | — | — | — | — | — | — | 2 | — | 7 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 2 | ESE 2 | — | — | SE 2 | — | — | WSW 10 | WSW 3 | — | W 9 | — | — | WNW 3 | NNW 3 | — | — | NNW 3 | E 3 | ESE 3 | — |
1 | 1 | — | — | 1 | — | — | 255 | 4 | — | 181 | — | — | 3 | 2 | — | — | 2 | 3 | 1 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 393 | 361 | 20 | 19 | 14 | 0 | 0 | 320 | 0 | 0 | 190 | 0 | 13 | 190 | 397 | 402 | 399 | 395 | 395 | 190 | 86 |
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.











