Surf Forecasts:
Crab Island surf forecast from 13 Jul 2026:
- Most powerful swell: Monday 13 Jul, 10AM (local time) - 2.5ft (0.8m), 4s period, E swell with 21 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 0.8m 4s and forecast to arrive on Monday (Jul 13) 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 0.8m 4s period and expected on Tuesday (Jul 14) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Mon 13th Jul) | 2.5ft (0.8m) 4s |
Table - best surf conditions forecast for Crab Island over the next 16 days.
Alright, surfers. Rusty here, and I’ve got to level with you right from the start… we’re looking at a real dud of a stretch ahead. There’s nothing but "poor surf conditions" for the entire 16-day window. Flat spells are one thing, but when the energy is that low that consistently, it’s a proper blank run. For a spot like Crab Island, this sort of quiet run is pretty normal for this time of year, so don’t go blaming yourself for missing a forecast.
We start off on Monday the 13th with a small, weak easterly windswell. The combined energy is just 29, which is barely a ripple. A stiff 16 mph cross-offshore wind will make it look clean, but with a swell height of only 3 ft and a short, weak 4-second period, it’s not something you’d paddle out for. By Monday afternoon, that tiny swell has collapsed to almost nothing.
The rest of the first week is a dead loss. Tuesday morning through to the following Monday all show waves under 1.0 ft and combined energy values crawling in the single or low double digits. For example, Thursday the 16th morning has a combined energy of just 9. Glassy conditions pop up here and there—like Tuesday afternoon and Wednesday afternoon—but there’s physically nothing to surf.
Moving into the second week, we see a slight increase in size around Wednesday the 22nd and Thursday the 23rd, but the swell direction shifts from the west to the southeast, and the period stays brutally short (3 to 4 seconds). The combined energy eventually climbs to 22 on Friday the 24th morning, but with 16 mph winds blowing across the face, it’s just messy, onshore junk.
The only *notable* bump in the entire run comes right at the tail end. On Monday the 27th, a southwest swell pushes the height up to 6 ft, with a combined energy of 337. That’s moderate energy finally. But the wind is howling from the southwest at 22 mph, blowing straight onshore, and the period is a weak 7 seconds. It’s going to be lumpy, blown-out, and frankly, more fun for the kite crew than for anyone with a paddle. By Tuesday the 28th, the swell drops to 5 ft but with a longer 10-second period and energy of 477, cross-shore winds of 16 mph. Still, the rating is zero across the whole forecast. Not a single standout moment in the lot.
So yeah, there are no good surf options here for the next 16 days. It’s one of those bleak stretches where you just leave the boards in the car and find a different hobby for a while. Forecasts can change, but this one is stubborn.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Tue afternoon, min 15°C on Sun night). Winds decreasing (fresh winds from the ENE on Sun night, calm by Wed afternoon). | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 27°C on Wed night, min 18°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 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) | E 4 | E 4 | W 15 | W 11 | WSW 11 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 8 | WSW 8 | WSW 8 | SW 7 | SW 7 | W 8 | W 8 | W 8 | W 8 | W 7 | W 7 | W 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 21 | 15 | 4 | 12 | 12 | 10 | 10 | 10 | 10 | 5 | 8 | 8 | 8 | 7 | 5 | 5 | 5 | 5 | 1 | 1 | 1 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross | glassy | cross | cross | glassy | cross | glassy | cross | off | cross-off | cross | off | glassy | cross | off | cross-on | glassy | off |
High Tide | 5:52AM8.65m | 6:19PM8.99m | 6:52AM9.05m | 7:15PM9.41m | 7:47AM9.35m | 8:07PM9.66m | 8:37AM9.47m | 8:55PM9.74m | 9:23AM9.43m | 9:40PM9.63m | 10:05AM9.21m | 10:22PM9.35m | 10:45AM8.86m | 11:01PM8.94m | |||||||
Low Tide | 11:58AM1.75m | 00:32AM1.52m | 12:56PM1.39m | 1:30AM1.17m | 1:50PM1.13m | 2:24AM0.97m | 2:39PM1.03m | 3:12AM0.94m | 3:24PM1.08m | 3:55AM1.08m | 4:05PM1.29m | 4:34AM1.38m | 4:43PM1.62m | ||||||||
 | |  | | | |  |  | | | |  | | | | | |  | | | | |
 | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — | 5:18 | — | — | 5:20 | — | — |
 | — | — | 9:29 | — | — | 9:28 | — | — | 9:27 | — | — | 9:25 | — | — | 9:24 | — | — | 9:23 | — | — | 9:22 |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 28 | 23 | 25 | 30 | 27 | 26 | 27 | 27 | 23 | 26 | 22 | 21 | 24 | 21 | 23 | 25 | 21 | 22 | 25 | 20 |
Feels °C | 20 | 23 | 17 | 22 | 27 | 22 | 25 | 27 | 25 | 21 | 22 | 21 | 19 | 21 | 19 | 22 | 22 | 17 | 20 | 23 | 16 |
Swell 1 Height (m) Direction Period (s) | W 19 | SW 19 | W 12 | W 11 | WSW 11 | WSW 10 | WSW 10 | WSW 9 | WSW 9 | W 8 | WSW 8 | WSW 8 | SW 7 | SW 7 | NW 3 | W 8 | W 8 | WNW 4 | W 7 | W 7 | WNW 3 |
| kJ | 7 | 15 | 3 | 10 | 12 | 10 | 9 | 8 | 8 | 5 | 7 | 7 | 8 | 7 | 2 | 5 | 5 | 1 | 1 | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | — | SW 15 | W 15 | SW 18 | SW 18 | SW 14 | SW 16 | SW 16 | SW 7 | W 10 | E 3 | WNW 4 | W 8 | W 8 | W 8 | SW 6 | SW 6 | W 8 | — | SW 5 | W 7 |
| kJ | — | 8 | 4 | 12 | 12 | 7 | 10 | 10 | 2 | 2 | 1 | 1 | 5 | 5 | 5 | 1 | 1 | 5 | — | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | — | W 14 | — | — | S 6 | SW 16 | SW 6 | SW 14 | SW 15 | — | SW 13 | SW 6 | — | — | SW 6 | SW 5 | — | — |
| kJ | 1 | 1 | 1 | — | 4 | — | — | 1 | 10 | 1 | 8 | 8 | — | 7 | 2 | — | — | 1 | 1 | — | — |
Wind waves Height (m) Direction Period (s) | E 4 | E 4 | E 4 | E 3 | E 3 | E 4 | E 3 | E 3 | ESE 3 | E 3 | ENE 3 | E 3 | — | — | — | — | — | NNW 3 | — | — | NE 2 |
| kJ | 21 | 13 | 18 | 5 | 3 | 18 | 5 | 3 | 3 | 1 | 1 | 5 | — | — | — | — | — | 1 | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 426 | 158 | 127 | 73 | 127 | 135 | 73 | 86 | 112 | 175 | 319 | 86 | 319 | 376 | 402 | 402 | 773 | 196 | 374 | 135 | 348 |
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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