Surf Forecasts:
Crab Island surf forecast from 21 Aug 2026:
- Most powerful swell: Friday 28 Aug, 4AM (local time) - 4.5ft (1.3m), 6s period, W swell with 141 kJ wave energy.
Best Forecast Surf Conditions for Crab Island this week:
The most powerful waves expected at Crab Island in the next 16 days are 1.3m 6s and forecast to arrive on Friday (Aug 28) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Tuesday (Aug 25) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Fri 28th Aug) | 4.5ft (1.3m) 6s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright, folks, Rusty here, giving you the lowdown on Crab Island.
The first few days are a write-off, with barely a ripple. Things start to look a little more interesting on Friday, August 30th, but it’s still a marginal call. You’ll see swell around 5ft from the WSW, but the wind is cross-onshore, so it’s going to be choppy. The wave energy is moderate, coming in at 415, but it’s not the kind of day that gets the heart racing.
The weekend of August 31st and into September 1st brings a bump in size, with the swell hitting 6ft from the W, but the cross-onshore wind doesn’t let up. The energy is strong, with a reading of 725 on the 31st, but the conditions are messy. This is for the seasoned surfers only; 6ft with onshore wind is a struggle, and it’s too big for beginners.
The best window, and the one I’d be looking at, is Saturday, August 30th morning. The swell is 5ft from the WSW, with a strong energy reading of 415. The wind is a light cross-onshore, which isn’t ideal, but it’s the best we’ve got. The period is 8 seconds, so it’s a decent wind swell, and the reef break will handle it better than a beach. The water is a very warm 70°, which is a massive 9° warmer than usual for this time of year – that’s super unusual, so you’ll be fine in a shorty or even just boardshorts. Crowds are a possibility here, so be ready to share the lineup.
After this, the surf drops off fast. By the start of September, we’re back to 2ft or less, with the wind turning more favorable but the size just not there. There’s a long gap of several days with no real recommendations after the 31st, so don’t plan a trip around it.
So, the call is simple: the morning of August 30th is your best shot. It’s not perfect, but it’s the only time the stars align enough to make it worth the effort. The rest of the forecast? Just small and sloppy.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Fri afternoon. Warm (max 21°C on Sun afternoon, min 12°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Mon night. Warm (max 24°C on Tue afternoon, min 15°C on Mon night). Winds decreasing (fresh winds from the E on Mon night, calm by Wed afternoon). | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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 9 | WSW 6 | WSW 8 | WSW 10 | WSW 10 | WSW 9 | W 9 | W 9 | SW 11 | WSW 9 | ESE 4 | SW 13 | E 4 | SW 13 | SSW 8 | W 9 | SW 5 | SW 6 | WSW 7 | W 6 | W 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 58 | 13 | 14 | 18 | 18 | 16 | 8 | 7 | 29 | 9 | 11 | 7 | 27 | 7 | 7 | 6 | 22 | 60 | 48 | 80 | 78 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | glassy | cross | cross-off | cross-on | cross | cross-off | cross | cross | cross | cross | cross | cross | cross-on | glassy | cross | cross-on | cross-on | cross |
High Tide | 12:49PM7.00m | 1:23AM6.79m | 2:19PM6.75m | 2:58AM6.69m | 3:48PM7.01m | 4:21AM7.06m | 4:55PM7.57m | 5:22AM7.63m | 5:45PM8.16m | 6:07AM8.18m | 6:26PM8.66m | 6:45AM8.62m | 7:02PM9.05m | ||||||||
Low Tide | 7:01PM3.61m | 7:43AM3.84m | 8:36PM3.79m | 9:21AM3.79m | 10:00PM3.49m | 10:37AM3.32m | 11:04PM2.94m | 11:31AM2.75m | 11:52PM2.38m | 12:13PM2.23m | 00:32AM1.92m | 12:49PM1.83m | 1:08AM1.55m | ||||||||
 |  |  | | |  | | | |  | | | | | |  | | | | |  | |
 | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | 8:27 | — | — | 8:24 | — | — | 8:22 | — | — | 8:21 | — | — | 8:19 | — | — | 8:15 | — | — | 8:14 | — |
mm | — | 1 | 1 | — | — | — | — | — | — | — | — | 2 | 1 | — | 1 | — | 1 | 4 | 1 | 2 | 15 |
Temp °C | 17 | 18 | 17 | 16 | 18 | 15 | 18 | 21 | 19 | 20 | 23 | 19 | 21 | 24 | 19 | 20 | 22 | 17 | 20 | 19 | 16 |
Feels °C | 13 | 14 | 13 | 14 | 14 | 11 | 16 | 18 | 16 | 14 | 18 | 12 | 15 | 19 | 17 | 21 | 21 | 14 | 17 | 15 | 7 |
Swell 1 Height (m) Direction Period (s) | WSW 9 | WSW 6 | W 5 | WSW 10 | WSW 10 | WSW 9 | W 9 | W 9 | SW 11 | WSW 9 | W 9 | W 9 | W 8 | SW 8 | SSW 8 | W 9 | W 8 | W 8 | WSW 7 | SW 8 | W 6 |
| kJ | 58 | 12 | 5 | 18 | 18 | 16 | 6 | 6 | 29 | 9 | 2 | 2 | 1 | 3 | 7 | 6 | 12 | 10 | 48 | 2 | 75 |
Swell 2 Height (m) Direction Period (s) | SW 13 | WSW 8 | WSW 8 | SW 15 | SW 15 | NNW 3 | SW 14 | SW 14 | SW 14 | W 10 | SW 9 | SW 13 | SW 9 | W 8 | W 10 | SSW 3 | SW 8 | — | SW 7 | — | — |
| kJ | 7 | 13 | 14 | 9 | 8 | 1 | 8 | 7 | 8 | 2 | 3 | 7 | 3 | 1 | 2 | 1 | 2 | — | 7 | — | — |
Swell 3 Height (m) Direction Period (s) | SW 16 | SW 13 | SW 13 | W 15 | — | SW 15 | SW 15 | — | W 14 | SW 14 | SW 14 | SW 9 | SW 13 | SW 13 | W 8 | SSW 8 | — | — | — | — | — |
| kJ | 10 | 7 | 7 | 5 | — | 8 | 8 | — | 4 | 8 | 7 | 3 | 7 | 7 | 1 | 6 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 4 | NW 3 | NE 2 | NNE 2 | — | — | — | — | — | E 3 | ESE 4 | E 4 | E 4 | ESE 3 | — | — | SW 5 | SW 6 | — | W 6 | W 6 |
| kJ | 3 | 5 | 1 | 1 | — | — | — | — | — | 4 | 11 | 18 | 27 | 4 | — | — | 22 | 60 | — | 80 | 78 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 262 | 15 | 15 | 199 | 51 | 135 | 127 | 20 | 395 | 320 | 325 | 320 | 164 | 86 | 269 | 15 | 18 | 187 | 187 | 368 |
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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