Surf Forecasts:
Crab Island surf forecast from 15 Aug 2026:
- Best quality surf: Thursday 20 Aug, 10AM (local time) - 3.5ft (1.1m), 6s period, W swell with cross-offshore winds.
- Most powerful swell: Tuesday 18 Aug, 10AM (local time) - 3.5ft (1.1m), 6s period, W swell with 100 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 10AM (local time) - 3.5ft (1.1m), 6s 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 Thursday (Aug 20) at 10AM. The primary swell is predicted to be 1.1m and 6s period with a secondary swell of 0.1m and 15s. Another secondary swell of 0.4m and 9s is also forecast. 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 1.1m 6s and forecast to arrive on Tuesday (Aug 18) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Saturday (Aug 15) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Thu 20th Aug) | 3.5ft (1.1m) 6s |
| Best Surf | 10AM (Thu 20th Aug) | 3.5ft (1.1m) 6s |
| Most Powerful | 10AM (Tue 18th Aug) | 3.5ft (1.1m) 6s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Gutted to be the one bringing you this one, folks. The 16-day window is looking pretty bleak for Crab Island. We’re looking at a long stretch of tiny, weak surf and mostly average to poor conditions. There’s a bit of a pulse of energy mid-period, but it’s nothing to get excited about. Let’s break it down day by day.
We start the run with almost nothing. The opening weekend is flat and messy. Saturday the 15th has some knee-high slop at 1ft, but the wind is blowing cross-off at 12 mph, chopping it up. Sunday the 16th will be glassy in the morning thanks to no wind, but there’s still no real swell to push through. The first few days are honestly a write-off. The energy is weak, with readings down around 20 to 40 in the brackets.
The middle of the week sees a small lift in size, but not in quality. Around Tuesday the 18th, the swell bumps to 4ft, and there’s a bit more push in the water (105 energy), but the wind is all wrong. It’s cross-shore all afternoon, making it lumpy and difficult. This pattern holds through Thursday the 20th. Morning sessions are the only real chance, with light cross-off winds, but even then, the waves are just "surfable" at best. Thursday morning is the pick of the week, honestly, but that’s not saying much. It’s a long period swell from the west, so at Crab Island, a reef break, it should have a little more shape, but it’s still barely over waist-high.
After that pulse, it fades away quickly. The last week of the window is a real disappointment. The swell drops back to dribble, with most days seeing 1ft to 1ft of weak, short-period junk. The energy readings drop back into the teens and twenties, and we get a weird, long-period groundswell rolling in on the 24th and 25th at 0.3ft with a 14-second period. That’s just enough to show you what could have been, but not enough to ride. Water temp is a crazy 70°, which is 8° warmer than normal for this time of year. That’s very unusual, and we'll be sweating in our wetsuits, that’s for sure.
Honestly, the only time this spot looks even remotely interesting for surfers is Thursday morning the 20th. Otherwise, the whole fortnight is a blank. If you’re out there, you’ll be on a log or a foamy. For the most part, conditions are too blown out for the size. I’d say the setup is more interesting for the kite crew than for paddle surfing on most days.
There’s a gap of several days at the start with zero options. The surf is tiny and poor for the entire run. The consistent theme is just not enough swell. A blank run like this is pretty normal for the area, so we just have to wait for the ocean to wake up. Forecasts can change, though, so keep an eye on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Sat afternoon, min 15°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Wed night. Warm (max 21°C on Tue morning, min 14°C on Thu night). Winds decreasing (fresh winds from the W on Wed afternoon, light winds from the N by Thu night). | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 8 | W 8 | WSW 7 | WSW 7 | W 7 | WSW 7 | W 5 | WSW 5 | W 7 | W 6 | WSW 6 | W 6 | W 6 | WSW 4 | WSW 5 | W 6 | WSW 6 | WSW 6 | WSW 6 | W 6 | WSW 8 |
Wave Graph | |||||||||||||||||||||
22 | 29 | 18 | 18 | 18 | 5 | 20 | 35 | 39 | 100 | 62 | 32 | 36 | 28 | 49 | 97 | 64 | 46 | 39 | 31 | 14 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | glassy | cross | cross-off | cross-off | cross | cross-on | cross-off | cross | cross-off | cross | cross | cross | cross-off | cross | cross-off | off | cross-off | off |
High Tide | 9:16PM9.76m | 9:37AM9.39m | 9:51PM9.46m | 10:10AM9.04m | 10:23PM9.02m | 10:41AM8.59m | 10:55PM8.48m | 11:12AM8.06m | 11:28PM7.89m | 11:51AM7.51m | 00:13AM7.29m | 12:49PM7.00m | 1:23AM6.79m | ||||||||
Low Tide | 3:01PM0.92m | 3:27AM0.99m | 3:34PM1.13m | 3:57AM1.32m | 4:04PM1.48m | 4:25AM1.75m | 4:35PM1.94m | 4:54AM2.27m | 5:08PM2.48m | 5:28AM2.83m | 5:52PM3.08m | 6:17AM3.42m | 7:01PM3.61m | ||||||||
6:00 | — | — | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:09 | — | — | |
— | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — | — | 8:29 | — | — | 8:27 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | 1 | 1 |
Temp °C | 21 | 22 | 16 | 19 | 19 | 18 | 19 | 19 | 18 | 21 | 19 | 18 | 18 | 18 | 16 | 17 | 17 | 16 | 17 | 17 | 14 |
Feels °C | 20 | 18 | 11 | 16 | 14 | 19 | 17 | 15 | 17 | 17 | 14 | 14 | 13 | 12 | 11 | 13 | 13 | 14 | 13 | 13 | 11 |
Swell 1 Height (m) Direction Period (s) | WSW 8 | W 8 | WSW 7 | WSW 7 | W 7 | WSW 7 | W 5 | W 18 | — | W 6 | SW 17 | W 6 | W 6 | SW 16 | W 9 | SW 15 | WSW 9 | WSW 6 | WSW 6 | WSW 9 | W 5 |
22 | 29 | 18 | 18 | 17 | 5 | 20 | 6 | — | 100 | 11 | 32 | 36 | 10 | 6 | 8 | 25 | 46 | 39 | 15 | 8 | |
Swell 2 Height (m) Direction Period (s) | NNW 4 | — | NW 4 | NW 4 | — | WSW 5 | W 7 | — | — | W 16 | — | SW 17 | SW 16 | — | SW 16 | W 9 | SW 14 | WSW 9 | WSW 9 | SW 13 | WSW 8 |
1 | — | 1 | 2 | — | 2 | 4 | — | — | 5 | — | 12 | 11 | — | 10 | 23 | 8 | 15 | 15 | 7 | 14 | |
Swell 3 Height (m) Direction Period (s) | WSW 8 | — | — | — | — | — | — | — | — | — | — | — | W 9 | — | SW 16 | W 15 | — | SW 14 | SW 16 | SW 16 | SW 13 |
6 | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 10 | 4 | — | 8 | 10 | 10 | 7 | |
Wind waves Height (m) Direction Period (s) | — | NW 3 | NNW 3 | — | WSW 7 | W 3 | — | WSW 5 | W 7 | — | WSW 6 | — | — | WSW 4 | WSW 5 | W 6 | WSW 6 | — | — | W 6 | NNW 3 |
— | 2 | 2 | — | 18 | 2 | — | 35 | 39 | — | 62 | — | — | 28 | 49 | 97 | 64 | — | — | 31 | 2 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 395 | 265 | 262 | 427 | 424 | 397 | 361 | 320 | 412 | 691 | 412 | 190 | 361 | 320 | 364 | 0 | 320 | 0 | 0 | 233 | 15 |
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.











