Crab Island Surf Break

Lat Long: 51.56° N 4.00° W

Crab Island Surf Forecast and Surf Report

Issued: 12 pm 18 Aug 2026 (local time)

Forecast update in  hr  min

Today's Crab Island sea temperature is
21.0° C
4.6° 

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 18 Aug 2026:

  • Best quality surf: Thursday 20 Aug, 7AM (local time) - 4.5ft (1.4m), 7s period, WSW swell with cross-offshore winds.
  • Most powerful swell: Thursday 20 Aug, 7AM (local time) - 4.5ft (1.4m), 7s period, WSW swell with 214 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 19 Aug, 1AM (local time) - 3ft (0.9m), 6s 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 19) at 1AM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.1m and 17s. 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 Thursday (Aug 20) at 7AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Friday (Aug 21) at 10PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Wed 19th Aug)3ft (0.9m) 6s
Best Surf 7AM (Thu 20th Aug)4.5ft (1.4m) 7s
Most Powerful 7AM (Thu 20th 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, and I’ve gotta be straight with you from the jump: Crab Island is looking pretty grim over the next two weeks. There’s really only one or two moments where you might paddle out and feel okay about it, but the rest of the time, you’re better off finding something else to do. We’re talking about a long run of days with nothing worth getting wet for, especially from the start through the end of August.

Kicking off, Tuesday the 18th and Wednesday the 19th are just messy. Tuesday morning you’ve got a 4ft cross-off swell from the west at 7 seconds, but the combined energy is only moderate at 141 and the wave comment says poor. That afternoon and all of Wednesday it gets worse – dropping down to 3ft and 3ft, small, weak, and crossed-up. The water is reading 70°, which is a whopping 8° warmer than normal for this time of year, so it’s much warmer than usual, but it doesn’t make up for the flat, grovelly conditions.

We grind through Thursday the 20th with some clean-looking but weak 4ft cross-off swells and energy around 158-163. Still, it’s not firing. Friday the 21st gives us a tiny window – Friday morning there’s a 2ft westerly swell, glassy, clean, but the energy is only 67 and the wave comment says it’s surfable but very ordinary. That’s the best of a bad batch, really. From Friday afternoon all the way through to Monday the 24th, it’s tiny, glassy or crossed-off dribble, with swells under 1.0ft and periods up to 14 seconds, combined energy dropping into the teens and twenties. Don’t even bother.

Now, here’s the one standout in the whole outlook, but it comes with a big warning. On Tuesday the 25th, a pulse of swell pushes through, with morning heights of 7ft from the southwest at 9 seconds, and the combined energy jumps to a massive 1188. That’s strong, powerful. But the wind on that morning is a fresh cross-onshore from the ESE at 22 mph, and it’s lumpy. That’s not paddle-surfing conditions, mate, that’s kite-surfing weather. The afternoon is still 5ft but messy. This is only for the heavies, and even then, it’s onshore slop. After that, from the 26th through the 30th, it’s back to tiny, weak, and crossed-up. There’s a brief, glassy window on Saturday afternoon the 29th with 2ft but just 61 energy and the wave comment says surfable but very ordinary.

Looking into early September, Tuesday the 1st and Wednesday the 2nd are still no good – 4ft to 5ft but onshore and choppy, energy between 62 and 136. Not worth it.

Honestly, if you’re going to pick one time to go, the Friday morning of the 21st of August is your best shot. It’s small, clean, and you might catch a few ripples. For the big swell on the 25th, leave the foam board at home and bring the kite gear – the island setup with that wind is just a mess for a paddle. It’s a quiet spell for Crab Island, and that’s how it goes sometimes.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Tue night. Very mild (max 19°C on Tue morning, min 12°C on Thu night). Winds increasing (light winds from the NW on Tue night, fresh winds from the W by Wed afternoon).

Days 4-6 Weather Summary

Mostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Fri night). Wind will be generally light.

Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
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
1
0
0
0
1
0
1
1
0
0
0
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)
1.2
W
7
1
WSW
6
0.9
WSW
6
0.8
WSW
6
1.1
WSW
5
1.4
WSW
7
1.4
WSW
7
1.2
W
7
0.9
WSW
9
0.6
WSW
8
0.4
WSW
8
0.3
WSW
8
0.3
WSW
10
0.3
WSW
10
0.3
W
9
0.2
WSW
9
0.2
WSW
9
0.2
W
8
0.2
W
8
0.2
WSW
9
0.4
WSW
4
Wave Graph
Metric surfscale
Energy kJ
130
85
66
46
56
175
208
146
132
54
22
14
18
18
14
8
8
8
8
8
7
Wind (km/h)
15
WNW
30
WSW
10
WNW
15
W
30
W
25
W
20
WNW
20
WNW
15
NNE
5
NNE
20
NNW
15
N
15
E
15
NNW
10
NE
0
ESE
5
W
10
NNE
15
SE
15
WSW
10
SW
Wind State
cross-off
cross
cross-off
cross
cross
cross
cross-off
cross-off
cross-off
off
cross-off
off
cross
cross-off
cross-off
glassy
cross
off
cross-on
cross-on
cross-on
High Tide
10:41AM8.59m
10:55PM8.48m
11:12AM8.06m
11:28PM7.89m
11:51AM7.51m
00:13AM7.29m
12:49PM7.00m
1:23AM6.79m
2:19PM6.75m
2:58AM6.69m
3:48PM7.01m
4:21AM7.06m
4:55PM7.57m
Low Tide
4:35PM1.94m
4:54AM2.27m
5:08PM2.48m
5:28AM2.83m
5:52PM3.08m
6:17AM3.42m
7:01PM3.61m
7:43AM3.84m
8:36PM3.79m
9:21AM3.79m
10:00PM3.49m
10:37AM3.32m
11:04PM2.94m
part cloud
cloud
rain showers
rain showers
clear
rain showers
part cloud
rain showers
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
clear
clear
part cloud
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:07
6:09
6:11
6:13
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:32
8:30
8:29
8:27
8:24
8:22
8:21
 mm
2
1
1
1
Temp °C
19
18
18
18
17
16
16
18
15
16
17
14
14
17
15
17
18
17
17
18
16
Feels °C
16
14
16
14
11
12
12
15
12
14
13
11
11
14
12
15
15
14
15
15
14
  • 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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