Surf Forecasts:
Crab Island surf forecast from 13 Aug 2026:
- Best quality surf: Thursday 13 Aug, 10PM (local time) - 2.5ft (0.7m), 10s period, WSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 18 Aug, 10AM (local time) - 4.5ft (1.4m), 7s period, W swell with 176 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 10PM (local time) - 2.5ft (0.7m), 10s 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 10PM. The primary swell is predicted to be 0.7m and 10s period with a secondary swell of 0.5m and 4s. 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 1.4m 7s 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 0.9m 4s period and expected on Saturday (Aug 15) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Thu 13th Aug) | 2.5ft (0.7m) 10s |
| Best Surf | 10PM (Thu 13th Aug) | 2.5ft (0.7m) 10s |
| Most Powerful | 10AM (Tue 18th Aug) | 4.5ft (1.4m) 7s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down what we've got.
Well, I gotta be straight with you. The next 16 days are a total bust at Crab Island. It’s a long, dry run of poor surf conditions, and there’s just nothing worth paddling out for. The whole stretch is a gap. From Thursday the 13th of August right through to Friday the 28th of August, every single session is tagged with "poor surf conditions" and a score of zero. It’s a bleak run.
The early part of the outlook, from mid-August, sees tiny swell. We’re talking 1 to 2 feet, with periods around 7 to 9 seconds – that’s weak, short-period windswill with combined wave energy readings between 5 and 64. Even when the wind goes glassy, like on Sunday morning the 16th with light easterly winds, there’s simply no power. It’s a cruel tease.
There is a small pulse of energy that shows up around Tuesday the 18th, with the swell bumping to 5 feet (combined energy 181). But it’s cross-off to cross-onshore wind, and at 7 seconds, it’s just a messy, short-period wall of chop with no shape. Not good.
Later in the month, around Thursday the 27th, we see another uptick to 4 feet from the WSW with a cross-off wind, but again, the period is a weak 7 seconds. The wave energy hits 145, but it’s all noise, no soul.
The water temperature on the morning of the 13th was 69°, which is a massive 7° warmer than average for this time of year. That’s very unusual, but it doesn’t make the surf any better.
So, honestly, there’s no standout. Nothing to recommend. It’s one of those spells where this area just goes to sleep. Don’t bother hauling the boards down. Forecasts can change, but this one is locked in poor. I’d leave the gear in the van for a fortnight.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Thu morning, min 13°C on Sat night). Winds increasing (light winds from the WNW on Thu night, fresh winds from the NNW by Sat afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Sun afternoon, min 15°C on Sun night). Winds increasing (calm on Sun morning, fresh winds from the WSW by Tue afternoon). | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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 10 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 8 | WSW 8 | W 7 | WSW 8 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 7 | WSW 4 | W 7 | WSW 7 | W 6 | W 6 | W 6 | WSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 149 | 143 | 98 | 64 | 61 | 48 | 22 | 40 | 19 | 11 | 10 | 5 | 5 | 4 | 16 | 176 | 135 | 84 | 76 | 39 | 15 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | cross-off | cross | cross | off | off | cross-off | off | glassy | cross | cross-off | glassy | cross | cross-on | cross-off | cross-on | cross | cross-off | cross | off |
High Tide | 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 | 10:41AM8.59m | 10:55PM8.48m | 11:12AM8.06m | 11:28PM7.89m | ||||||||
Low Tide | 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 | 4:25AM1.75m | 4:35PM1.94m | 4:54AM2.27m | 5:08PM2.48m | ||||||||
 | |  |  |  | | | |  | | | | | | | | | | | | | |
 | 5:56 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — |
 | — | 8:43 | — | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 24 | 20 | 20 | 22 | 18 | 20 | 20 | 15 | 18 | 20 | 16 | 19 | 19 | 18 | 20 | 19 | 18 | 17 | 19 | 17 |
Feels °C | 21 | 22 | 20 | 19 | 21 | 16 | 15 | 14 | 10 | 15 | 15 | 12 | 17 | 17 | 16 | 17 | 16 | 14 | 14 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 10 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 8 | WSW 8 | W 7 | WSW 8 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 7 | — | W 16 | SW 17 | SW 17 | SW 16 | SW 16 | WSW 5 |
| kJ | 149 | 143 | 98 | 64 | 61 | 48 | 22 | 40 | 19 | 11 | 10 | 5 | 5 | 4 | — | 5 | 11 | 12 | 11 | 10 | 9 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | W 11 | WSW 7 | — | NW 4 | — | — | W 5 | — | W 8 | — | — | — | W 17 | — | W 9 | WSW 7 |
| kJ | — | — | — | — | — | 2 | 5 | — | 1 | — | — | 2 | — | 1 | — | — | — | 6 | — | 2 | 15 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | W 10 | — | — | — | — | W 5 | — | — | — | — | — | — | — | — | SW 16 |
| kJ | — | — | — | — | — | — | 2 | — | — | — | — | 2 | — | — | — | — | — | — | — | — | 10 |
Wind waves Height (m) Direction Period (s) | — | — | W 3 | — | W 3 | — | NNW 4 | NW 4 | NNW 4 | — | — | NNW 4 | — | — | WSW 4 | W 7 | WSW 7 | W 6 | W 6 | W 6 | — |
| kJ | — | — | 2 | — | 1 | — | 10 | 10 | 5 | — | — | 5 | — | — | 16 | 176 | 135 | 84 | 76 | 39 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 15 | 361 | 0 | 20 | 361 | 190 | 395 | 597 | 262 | 398 | 423 | 431 | 307 | 451 | 364 | 141 | 424 | 319 | 190 | 190 | 45 |
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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