Surf Forecasts:
Crab Island surf forecast from 31 Jul 2026:
- Best quality surf: Monday 3 Aug, 10PM (local time) - 2.5ft (0.7m), 8s period, WSW swell with cross-offshore winds.
- Most powerful swell: Monday 3 Aug, 4PM (local time) - 2.5ft (0.8m), 9s period, WSW swell with 90 kJ wave energy.
- Next surfable swell (1★+): Monday 3 Aug, 10PM (local time) - 2.5ft (0.7m), 8s 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 Monday (Aug 03) at 10PM. The primary swell is predicted to be 0.7m 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 0.8m 9s and forecast to arrive on Monday (Aug 03) 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 0.3m 3s period and expected on Thursday (Aug 06) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Mon 3rd Aug) | 2.5ft (0.7m) 8s |
| Best Surf | 10PM (Mon 3rd Aug) | 2.5ft (0.7m) 8s |
| Most Powerful | 4PM (Mon 3rd Aug) | 2.5ft (0.8m) 9s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you. We’ve got a full 16-day window, but honestly, there’s not a single surfable recommendation for this stretch. The forecast kicks off on Friday the 31st of July, but every single session comes back as poor. It's a long, quiet run with nothing to get excited about.
Crab Island (Crab-Island) is a reef break that’s fairly consistent, exposed to the SW, and it prefers a SW swell. Problem is, we just don’t have the energy or the conditions lining up. Over the first week, the swell is tiny—mostly ankle to knee-high, with the biggest push only reaching about 3 ft on the afternoon of Monday the 3rd of August. Periods are often short, sitting around 5 to 9 seconds, which means weak, choppy lines. Winds are all over the place: cross-off, cross, onshore—you name it. The water temperature on the Friday morning is sitting at 67°F, which is much warmer than normal for this time of year, but that’s about the only standout.
As we move deeper into the second week, the pattern doesn’t change. The largest swell shows up around the 14th and 15th of August, still only peaking at 3 ft, and the combined wave energy is still low—only hitting the low 90s at best (89-91). Winds stay unfavourable, often cross-onshore, and the surf quality remains poor. The glassy moment on the morning of Sunday the 2nd of August is a fleeting tease, but the swell is only 1 ft.
There are consistent gaps of poor conditions right through this forecast. It’s a blank run, and for a spot like Crab Island, it’s not abnormal to have these quiet spells. Keep your eyes on the forecasts, because it tends not to stay flat for too long. For now, leave the boards at home.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Sun afternoon, min 14°C on Fri night). Winds decreasing (fresh winds from the W on Fri afternoon, calm by Sun afternoon). | Days 4-6 Weather SummarySome drizzle, heaviest during Mon night. Warm (max 23°C on Mon morning, min 13°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | |||||||||||||||
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 5 | W 4 | W 4 | W 5 | W 5 | WSW 8 | WSW 8 | WSW 8 | WSW 10 | WSW 9 | WSW 9 | WSW 8 | WSW 8 | WSW 7 | WSW 7 | SW 7 | WSW 7 | WSW 6 | WSW 6 | SW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 12 | 19 | 9 | 19 | 16 | 24 | 13 | 13 | 38 | 68 | 90 | 45 | 42 | 86 | 46 | 23 | 30 | 23 | 16 | 10 | 9 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross | off | cross-on | glassy | cross-on | cross-on | cross | off | on | cross-on | cross-on | off | cross-off | off | cross-off | cross-off | off |
High Tide | 8:33PM9.18m | 8:49AM8.96m | 9:07PM9.24m | 9:22AM8.97m | 9:40PM9.18m | 9:54AM8.86m | 10:13PM9.00m | 10:28AM8.65m | 10:49PM8.70m | 11:05AM8.34m | 11:30PM8.31m | 11:51AM7.95m | 00:25AM7.86m | ||||||||
Low Tide | 2:15PM1.60m | 2:37AM1.43m | 2:47PM1.51m | 3:09AM1.37m | 3:18PM1.51m | 3:41AM1.44m | 3:50PM1.63m | 4:14AM1.63m | 4:23PM1.85m | 4:49AM1.92m | 5:02PM2.18m | 5:31AM2.32m | 5:52PM2.60m | ||||||||
 | |  | |  |  | | | | |  |  | | | | | | | | | | |
 | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:46 | — | — |
 | — | — | 9:06 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 | — | — | 9:00 | — | 8:58 | — | — | 8:55 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 16 | 17 | 17 | 16 | 20 | 25 | 21 | 23 | 23 | 20 | 20 | 20 | 18 | 18 | 20 | 15 | 18 | 19 | 14 |
Feels °C | 12 | 11 | 13 | 13 | 12 | 14 | 16 | 22 | 18 | 20 | 20 | 17 | 18 | 18 | 18 | 14 | 15 | 11 | 13 | 14 | 10 |
Swell 1 Height (m) Direction Period (s) | W 5 | W 12 | W 11 | W 5 | WSW 9 | WSW 8 | WSW 8 | WSW 8 | WSW 10 | WSW 9 | WSW 9 | WSW 8 | WSW 8 | — | WSW 7 | SW 7 | W 10 | WSW 6 | WSW 6 | SW 6 | SW 6 |
| kJ | 12 | 3 | 2 | 19 | 16 | 24 | 13 | 13 | 38 | 68 | 90 | 45 | 42 | — | 46 | 23 | 2 | 23 | 16 | 10 | 9 |
Swell 2 Height (m) Direction Period (s) | W 9 | W 12 | W 9 | WSW 10 | — | W 4 | — | — | — | — | — | — | — | — | WSW 8 | W 8 | W 13 | W 10 | W 10 | W 10 | W 10 |
| kJ | 2 | 3 | 2 | 19 | — | 3 | — | — | — | — | — | — | — | — | 7 | 5 | 3 | 2 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | W 8 | — | W 9 | — | — | — | — | W 11 | — | — | — | — | — | — | — | — | W 8 | W 13 | W 13 | SW 12 | SW 12 |
| kJ | 1 | — | 2 | — | — | — | — | 3 | — | — | — | — | — | — | — | — | 1 | 3 | 3 | 6 | 6 |
Wind waves Height (m) Direction Period (s) | — | W 4 | W 4 | — | W 5 | — | — | — | — | — | — | — | — | WSW 7 | — | — | WSW 7 | WSW 6 | — | WSW 2 | — |
| kJ | — | 19 | 9 | — | 15 | — | — | — | — | — | — | — | — | 86 | — | — | 30 | 8 | — | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 398 | 779 | 360 | 190 | 206 | 190 | 386 | 190 | 15 | 19 | 1 | 15 | 183 | 183 | 120 | 385 | 137 | 176 | 374 | 206 | 364 |
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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