Surf Forecasts:
Crab Island surf forecast from 27 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 10PM (local time) - 3.5ft (1.0m), 5s period, W swell with cross-offshore winds.
- Most powerful swell: Sunday 30 Aug, 1AM (local time) - 6.5ft (2.0m), 10s period, WSW swell with 687 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 10PM (local time) - 3.5ft (1.0m), 5s 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 Tuesday (Sep 01) at 10PM. The primary swell is predicted to be 1.0m and 5s period with a secondary swell of 0.1m and 17s. Another secondary swell of 0.1m and 16s 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 2.0m 10s and forecast to arrive on Sunday (Aug 30) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Tue 1st Sep) | 3.5ft (1.0m) 5s |
| Best Surf | 10PM (Tue 1st Sep) | 3.5ft (1.0m) 5s |
| Most Powerful | 1AM (Sun 30th Aug) | 6.5ft (2.0m) 10s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Rusty here again. Let's break down the same forecast but in good old feet and miles per hour for the main event at Crab Island.
Right now, it's a tough stretch. On August 27th, we've got a knee-slapper of a wave, barely 0.6ft from the west. The water is unusually warm, a good 4° above normal at 68°F. But with a light cross-shore wind, it's just a chopfest.
From the 28th through the 6th of September, you'll be doing more waiting than surfing. The swell tries to get going, especially around the 30th and 31st, with some medium energy kicking in. But the wind is the enemy here. We get a fresh cross-onshore wind on the 30th, gusting up to 19 mph, making it lumpy and rough. The 3rd of September is even worse, with a strong 25 mph cross-onshore wind. It's messy.
But hold onto your board, because on the morning of Monday, September 7th, everything clicks. The southwest swell direction is perfect for the reef. We're looking at a solid 10ft of west swell with a 9-second period, pumping out massive energy. And the wind? It's switching to a light, offshore breeze. That means clean, organized, powerful waves. This is the one to wait for. Crab Island is an exposed reef, so this is an expert-only session. The wave faces will be big and intimidating. If you're not skilled enough, just watch the show.
The rest of the week is back to small and ordinary. The morning of the 11th of September offers some fresh offshore wind and a 6ft swell, but the period is short (7-8 seconds), so it'll be a bit weak and punchy. Nothing compared to that Monday morning. That's the session to circle on your calendar. It's over a week out, so keep hoping, but the signs are good.
Rusty, out.
Short Range ForecastHeavy rain (total 27mm), heaviest during Sat morning. Warm (max 20°C on Thu afternoon, min 16°C on Sat night). Winds increasing (light winds from the SW on Thu night, strong winds from the W by Sat afternoon). | Days 5-7 Weather SummaryModerate rain (total 12mm), heaviest on Sun night. Very mild (max 18°C on Sun afternoon, min 15°C on Sun night). Winds decreasing (fresh winds from the SSW on Sun afternoon, light winds from the WNW by Tue night). | |||||||||||||||||||
Thu 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | ||||||||||||||
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 7 | SW 6 | SW 6 | SW 6 | WSW 6 | SW 6 | SW 7 | WSW 10 | WSW 9 | WSW 9 | WSW 8 | WSW 10 | WSW 10 | WSW 9 | WSW 6 | W 6 | W 6 | WSW 6 | W 6 | WSW 3 |
Wave Graph  | ||||||||||||||||||||
 kJ | 4 | 15 | 138 | 239 | 103 | 106 | 112 | 687 | 311 | 280 | 250 | 471 | 416 | 206 | 64 | 66 | 69 | 35 | 16 | 10 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross | cross-on | cross-on | cross | cross-off | cross | cross | cross | cross | cross-off | cross-off | cross | cross-on |
High Tide | 7:02PM9.05m | 7:20AM8.96m | 7:36PM9.33m | 7:53AM9.20m | 8:09PM9.52m | 8:25AM9.34m | 8:42PM9.58m | 8:57AM9.36m | 9:15PM9.49m | 9:28AM9.22m | 9:48PM9.24m | 10:01AM8.93m | 10:23PM8.83m | |||||||
Low Tide | 1:08AM1.55m | 1:22PM1.53m | 1:41AM1.29m | 1:53PM1.31m | 2:12AM1.13m | 2:23PM1.21m | 2:43AM1.09m | 2:54PM1.23m | 3:14AM1.21m | 3:24PM1.39m | 3:45AM1.48m | 3:57PM1.70m | ||||||||
 |  | |  |  |  | |  | | | |  | |  |  | | | |  | | |
 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — |
 | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | — | 8:00 | — |
mm | 1 | 2 | 4 | 3 | 5 | 9 | 1 | — | 2 | 3 | 6 | — | — | — | — | 3 | — | — | — | — |
Temp °C | 20 | 18 | 18 | 18 | 17 | 18 | 18 | 16 | 19 | 18 | 16 | 16 | 17 | 16 | 17 | 17 | 17 | 17 | 17 | 17 |
Feels °C | 19 | 18 | 14 | 14 | 15 | 14 | 14 | 12 | 16 | 13 | 12 | 12 | 12 | 13 | 12 | 13 | 16 | 15 | 15 | 16 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 7 | — | — | — | W 6 | SW 7 | WSW 10 | WSW 9 | — | WSW 8 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 18 | W 6 | WSW 6 | W 6 | SW 15 |
| kJ | 4 | 4 | — | — | — | 35 | 112 | 687 | 311 | — | 250 | 471 | 416 | 206 | 26 | 6 | 69 | 35 | 16 | 9 |
Swell 2 Height (m) Direction Period (s) | — | W 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 16 | SW 16 | W 8 | SW 15 |
| kJ | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 10 | 10 | 5 | 9 |
Swell 3 Height (m) Direction Period (s) | SW 7 | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 16 | W 16 | SW 16 | — |
| kJ | 2 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 5 | 10 | — |
Wind waves Height (m) Direction Period (s) | — | SW 6 | SW 6 | SW 6 | WSW 6 | SW 6 | — | — | — | WSW 9 | — | — | WSW 10 | — | WSW 6 | W 6 | — | — | — | WSW 3 |
| kJ | — | 15 | 138 | 239 | 103 | 106 | — | — | — | 280 | — | — | 301 | — | 64 | 66 | — | — | — | 10 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 183 | 176 | 224 | 273 | 205 | 176 | 320 | 50 | 68 | 427 | 144 | 10 | 144 | 68 | 226 | 141 | 0 | 102 | 320 | 351 |
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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