Surf Forecasts:
Crab Island surf forecast from 23 Jul 2026:
- Best quality surf: Sunday 26 Jul, 10PM (local time) - 3.5ft (1.1m), 6s period, W swell with cross-offshore winds.
- Most powerful swell: Sunday 26 Jul, 4PM (local time) - 4ft (1.2m), 7s period, W swell with 126 kJ wave energy.
- Next surfable swell (1★+): Sunday 26 Jul, 10PM (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 Sunday (Jul 26) at 10PM. The primary swell is predicted to be 1.1m and 6s 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 1.2m 7s and forecast to arrive on Sunday (Jul 26) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Wednesday (Jul 29) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sun 26th Jul) | 3.5ft (1.1m) 6s |
| Best Surf | 10PM (Sun 26th Jul) | 3.5ft (1.1m) 6s |
| Most Powerful | 4PM (Sun 26th Jul) | 4ft (1.2m) 7s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
The Lowdown
Alright, let me tell you about the outlook for Crab Island. It’s a reef setup, exposed to the swell. The water temp is sitting at 69°, which is much warmer than normal for this time of year—a solid 9° above average, so you can leave the thick wetsuit at home.
Honestly, the next week and a half is pretty grim. Nothing’s really happening. We’ve got a long stretch of tiny, weak waves with poor conditions. From Thursday the 23rd of July right through to the end of the month, it’s a whole lot of nothing. We’re talking flat spells with only 0.3ft to 1.0ft on offer, and the combined swell energy is barely a whisper, mostly single digits (1–18). There’s a tease on Sunday the 26th where the swell bumps up to 4ft and the energy hits 113 to 126, but it’s still getting rated as poor surf. The wind is cross-off from the WNW, so it’s clean, but the waves just aren’t there to get excited about.
The real story, the only thing worth paying attention to, is the first weekend of August. On Saturday the 1st of August, we finally get some proper size. The morning shows 7ft of WSW swell with a 9-second period, and the combined energy is a solid 686. That’s moderate-to-strong energy, and it’s a groundswell, so it’ll have some punch. It’s a bit on the bigger side, over 8ft in the afternoon, so that’s strictly for the experienced crew. The wind is light from the S and SW, cross-on, which isn’t perfect, but it’s light enough that it shouldn’t ruin it. This is the standout window. The only real option in the whole 16 days.
Because it’s a reef, that long-period groundswell with a 9-second period will wrap in nicely, giving it shape. Just keep in mind the crowds are listed as "sometimes," so you might have some company, but it won’t be a zoo.
After that, it drops back off quickly. Sunday the 2nd has 5ft, but it’s got rain and light cross-on wind, and the energy is already down to 336. By Monday, it’s back to tiny, weak junk. The rest of the forecast is a write-off, with nothing but small, choppy, and onshore trash.
So, if you’re a beginner, steer clear of that Saturday. If you’re an expert, mark your calendar for August 1st. It’s the only chance for a real wave.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Thu afternoon, min 15°C on Thu night). Winds increasing (calm on Fri morning, fresh winds from the W by Sat morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Tue afternoon, min 13°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | ||||||||||||||
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 8 | NW 3 | W 13 | W 8 | WNW 3 | W 4 | W 4 | W 6 | W 6 | W 7 | W 6 | W 7 | WSW 6 | WSW 6 | WSW 6 | WSW 5 | W 5 | W 11 | WSW 3 | W 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1 | 2 | 3 | 1 | 2 | 3 | 29 | 75 | 113 | 126 | 76 | 43 | 39 | 11 | 6 | 5 | 4 | 2 | 3 | 8 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | glassy | cross | cross-off | cross | cross | cross | cross-off | cross-off | cross-off | cross | cross | cross-off | glassy | cross | cross-off | cross | cross | off |
High Tide | 2:22AM7.17m | 3:07PM7.14m | 3:36AM7.15m | 4:18PM7.38m | 4:45AM7.40m | 5:18PM7.78m | 5:41AM7.77m | 6:06PM8.20m | 6:27AM8.12m | 6:47PM8.55m | 7:06AM8.42m | 7:24PM8.82m | ||||||||
Low Tide | 8:02PM3.24m | 8:40AM3.34m | 9:16PM3.29m | 9:53AM3.26m | 10:24PM3.08m | 10:57AM2.97m | 11:22PM2.74m | 11:49AM2.60m | 00:10AM2.37m | 12:31PM2.27m | 00:51AM2.06m | 1:08PM1.99m | 1:28AM1.79m | |||||||
 |  | | |  |  |  |  | | | | | | | | | | | | | |
 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — |
 | — | 9:17 | — | — | 9:16 | — | — | 9:15 | — | — | 9:14 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 18 | 20 | 23 | 19 | 18 | 17 | 17 | 19 | 20 | 17 | 16 | 17 | 16 | 22 | 24 | 21 | 21 | 23 | 21 |
Feels °C | 20 | 15 | 18 | 19 | 16 | 14 | 14 | 15 | 14 | 15 | 15 | 12 | 13 | 15 | 22 | 21 | 19 | 18 | 20 | 19 |
Swell 1 Height (m) Direction Period (s) | W 8 | NW 3 | W 8 | W 8 | WNW 3 | W 8 | — | W 6 | — | — | W 6 | W 7 | W 6 | WSW 6 | WSW 6 | WSW 5 | W 5 | W 5 | W 10 | W 4 |
| kJ | 1 | 2 | 1 | 1 | 2 | 1 | — | 75 | — | — | 76 | 43 | 18 | 11 | 6 | 5 | 4 | 2 | 2 | 5 |
Swell 2 Height (m) Direction Period (s) | — | W 8 | W 13 | — | W 8 | — | — | — | — | — | — | — | — | W 8 | W 8 | W 8 | W 8 | W 11 | W 7 | W 7 |
| kJ | — | 1 | 3 | — | 1 | — | — | — | — | — | — | — | — | 6 | 1 | 1 | 1 | 2 | 1 | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 12 | W 11 | W 8 | — | W 10 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 2 | 1 | — | 8 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | W 4 | W 4 | WSW 6 | W 6 | W 7 | — | — | WSW 6 | — | — | — | — | — | WSW 3 | — |
| kJ | — | — | — | — | — | 3 | 29 | 64 | 113 | 126 | — | — | 39 | — | — | — | — | — | 3 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 842 | 364 | 395 | 897 | 441 | 899 | 414 | 438 | 361 | 372 | 0 | 189 | 206 | 88 | 135 | 189 | 135 | 189 | 190 | 190 |
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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