Crab Island Surf Break

Lat Long: 51.56° N 4.00° W

Crab Island Surf Forecast and Surf Report

Issued: 12 am 09 Aug 2026 (local time)

Forecast update in  hr  min

Today's Crab Island sea temperature is
20.6° C
4.4° 

Crab Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Crab Island surf forecast from 9 Aug 2026:

  • Best quality surf: Wednesday 12 Aug, 10PM (local time) - 2.5ft (0.7m), 9s period, WSW swell with glassy winds.
  • Most powerful swell: Thursday 13 Aug, 10PM (local time) - 3ft (0.9m), 10s period, W swell with 154 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 12 Aug, 10PM (local time) - 2.5ft (0.7m), 9s 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 Wednesday (Aug 12) at 10PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.2m and 3s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Crab Island in the next 16 days are 0.9m 10s and forecast to arrive on Thursday (Aug 13) at 10PM. 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 Friday (Aug 14) at 7PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Wed 12th Aug)2.5ft (0.7m) 9s
Best Surf10PM (Wed 12th Aug)2.5ft (0.7m) 9s
Most Powerful10PM (Thu 13th Aug)3ft (0.9m) 10s

Table - best surf conditions forecast for Crab Island over the next 16 days.


The Lowdown

Alright, folks, Rusty here. Let’s be straight with you. Looking at the charts for the next couple of weeks, it’s a pretty quiet stretch for our shores. We’ve got a lot of tiny, weak swell and not much push behind it. The energy in the water is gonna be low for the most part, and you’ll be scratching around for anything rideable. It’s not a total write-off, but you gotta be patient and pick your moments.

The first few days are looking pretty sad. Through Sunday and Monday, we’re looking at knee-high mush at best. The swell is weak, with combined energy readings in the low double digits, like 5 and 24. The wind is mostly cross or light, so it’s not going to be a total mess, but there’s just nothing to work with. You’re better off doing something else.

We finally see a little pulse of energy roll in for Thursday morning, the 13th. It’s still small, only about 2.5ft, but the period stretches out to 11 seconds, which gives it a bit more grunt. The energy reading jumps to 177, which is the best we’ll see for a while. The wind is dead glassy, so it’ll be clean. This is the standout of the first week, but don’t get too excited. It’s still just a small, clean, surfable wave. The water temp is about average for this time of year, so nothing crazy there.

After that, it’s back to the small stuff. Friday and Saturday are pretty much flat with weak, short-period wind swell. The energy drops right back down, and we’re back to chasing shadows. The wind is okay, clean at times, but the surf is just not there.

The following week doesn't offer much hope either. We’ve got a long stretch of small, weak surf from about the 17th through the 23rd. There’s a slight bump in the swell on the 19th, with 2.5ft and a bit more energy (51 and 84), and the wind is offshore in the morning, so it’ll be clean. But again, it’s not going to be anything to write home about. The period is short, around 6 seconds, so it’ll be soft and crumbly, not really offering any punch.

There’s another moment on the 23rd, a Sunday, where the morning goes glassy with a 2.5ft swell, but the energy is still modest. It’s surfable, but ordinary. The whole window is just lacking that real groundswell. We’ve got a lot of small, short-period stuff, which isn't great for the reef here. It’ll be and a bit fat, not the kind of wave that gets your heart pumping.

So, the honest truth is, this 16-day run is a bit of a bust. There’s nothing that stands out as a proper session. The only time I’d really consider paddling out is that Thursday morning glass-off, but only if you’re desperate for a slide. The rest of the time, the kites might have more fun than us. The forecast can change, and it tends not to stay this poor for long, but as it stands, keep your board in the car and your expectations low.

Keep an eye on the charts, and I’ll see you out there when it turns on.

Short Range Forecast

Mostly dry. Warm (max 26°C on Tue afternoon, min 14°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 31°C on Wed afternoon, min 17°C on Tue night). Wind will be generally light.

Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.2
WSW
7
0.1
W
8
0.4
SW
4
0.6
W
6
0.3
SW
6
0.3
SW
7
0.2
W
8
0.2
W
10
0.3
WSW
11
0.5
WSW
10
0.6
WSW
10
0.8
WSW
9
0.8
WSW
11
0.8
WSW
10
0.8
WSW
10
0.6
WSW
9
0.6
W
9
0.4
WSW
8
0.3
WSW
8
0.3
WSW
8
0.3
WSW
7
Wave Graph
Metric surfscale
Energy kJ
4
2
4
23
6
7
5
7
25
57
74
92
153
136
128
64
57
22
12
11
11
Wind (km/h)
10
WSW
20
WSW
10
WNW
15
NNW
15
WSW
15
ENE
25
ESE
10
SSE
15
E
25
ESE
15
SSE
5
ESE
5
S
15
W
15
NW
15
NNW
25
NW
10
NNE
5
SE
15
WSW
25
ESE
Wind State
cross
cross
cross-off
off
cross
cross-off
cross-on
cross-on
cross
cross-on
cross-on
glassy
glassy
cross
cross-off
cross-off
cross-off
off
glassy
cross
cross
High Tide
3:58PM7.72m
4:41AM7.93m
5:13PM8.36m
5:50AM8.55m
6:15PM9.02m
6:47AM9.10m
7:08PM9.53m
7:37AM9.48m
7:55PM9.82m
8:21AM9.64m
8:38PM9.89m
9:01AM9.60m
9:16PM9.76m
Low Tide
9:32AM2.97m
10:18PM2.69m
10:52AM2.46m
11:32PM2.07m
11:58AM1.85m
00:33AM1.47m
12:53PM1.33m
1:26AM1.04m
1:41PM1.00m
2:12AM0.82m
2:23PM0.87m
2:52AM0.81m
3:01PM0.92m
3:27AM0.99m
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:50
5:52
5:54
5:54
5:56
5:58
6:00
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:51
8:49
8:46
8:45
8:43
8:40
8:38
 mm
Temp °C
19
19
17
20
21
19
23
26
23
27
31
27
27
30
22
26
26
22
23
26
24
Feels °C
18
16
15
18
19
16
21
23
21
22
27
26
24
26
19
22
21
19
22
23
21
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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