Mewslade Bay Surf Break

Lat Long: 51.56° N 4.29° W

Mewslade Bay Surf Forecast and Surf Report

Issued: 12 am 11 Sep 2026 (local time)

Forecast update in  hr  min

Today's Mewslade Bay sea temperature is
18.8°C
2.9° 

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


Mewslade Bay surf forecast from 11 Sep 2026:

  • Best quality surf: Friday 11 Sep, 1PM (local time) - 4ft (1.2m), 9s period, WSW swell with cross-offshore winds.
  • Most powerful swell: Saturday 12 Sep, 7PM (local time) - 6ft (1.9m), 7s period, WSW swell with 369 kJ wave energy.
  • Next surfable swell (1★+): Friday 11 Sep, 1PM (local time) - 4ft (1.2m), 9s period with WSW swell.

Best Forecast Surf Conditions for Mewslade Bay this week:

The surf forecast for Mewslade Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 11) at 1PM. The primary swell is predicted to be 1.2m and 9s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Mewslade Bay in the next 16 days are 1.9m 7s and forecast to arrive on Saturday (Sep 12) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Tuesday (Sep 15) at 10PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 1PM (Fri 11th Sep)4ft (1.2m) 9s
Best Surf 1PM (Fri 11th Sep)4ft (1.2m) 9s
Most Powerful 7PM (Sat 12th Sep)6ft (1.9m) 7s

Table - best surf conditions forecast for Mewslade Bay over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let’s have a look at what Mewslade Bay has in store for us over the next couple of weeks.

Right off the bat, I’m going to be straight with you – we’ve got a long, frustrating stretch of onshore and cross-shore chop ahead, with a lot of poor conditions. The water temp is about normal for this time of year, nothing crazy. The first window that looks even remotely usable isn’t until the morning of Monday the 21st of September. That’s a solid week of waiting.

Before that, we do see a spike of moderate energy (576) on Saturday the 19th with 7ft swell from the west, but the cross-onshore wind from the WSW is going to mess it up. That one’s a kite-surfing setup if anything. The same goes for Sunday the 20th – a 6ft west swell has cross-onshore wind again, spoiling the shape.

Alright, let’s talk about the proper highlight. The best on offer is Monday the 21st of September. We get a clean 6ft west swell rolling in, with a 7-second period and a moderate 12 mph offshore wind from the north. Mewslade is an exposed bay, and the northern wind is blowing straight off the land, grooming those waves perfectly. Combined energy is a solid 303 – moderate, but with that offshore wind, the faces will be clean. This is the peak of the run. It’s fairly consistent here, but expect some company – crowds are sometimes a thing.

Then, another standout appears on Thursday the 24th of September. We’re looking at a 7ft west swell, 8-second period, and the morning goes glassy with absolute zero wind – a north-northwest breeze at only 3 mph. That’s a recipe for perfection. The energy jumps to 558, which is a very solid, powerful wave. This is an intermediate zone, but the wave height is getting up there. The afternoon shifts to a cross-shore, but for a few hours in the morning, it’ll be magical.

Now, a word of caution. The very end of the forecast, on Friday the 25th and Saturday the 26th of September, shows a very big southwest swell – 10ft and 12ft (Friday), with combined energies over 1200 and 1800. That is for experts only. The wind is light offshore off the east, so the waves will be clean, but that size at Mewslade will be intimidating and dangerous. It is simply too big for most.

So in short: grit your teeth through the first week. The real action is on Monday 21st for clean head-high, and Thursday 24th for a glassy, bigger morning session. The end of the month brings big, clean, expert-only surf.

Rusty

Short Range Forecast

Moderate rain (total 19mm), heaviest on Sat night. Very mild (max 18°C on Thu night, min 14°C on Fri night). Winds increasing (light winds from the W on Fri afternoon, fresh winds from the SW by Sat afternoon).

Days 4-6 Weather Summary

Some drizzle, heaviest during Tue morning. Very mild (max 19°C on Mon morning, min 14°C on Tue night). Winds increasing (light winds from the SSW on Mon afternoon, fresh winds from the WNW by Tue morning).

Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
0
0
0
0
0
0
0
0
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)
1.4
WSW
9
1
WSW
9
0.9
WSW
8
1.5
WSW
5
1.8
WSW
7
1.8
WSW
7
1.2
WSW
7
1.1
WSW
10
0.9
WSW
9
0.9
WSW
9
0.9
WSW
9
0.9
WSW
8
1.1
WSW
6
1.7
W
6
1.3
WSW
8
1.3
WSW
10
1.1
W
10
0.9
W
10
0.7
WSW
6
1
WSW
6
1
W
6
Wave Graph
Metric surfscale
Energy kJ
314
169
99
125
306
321
135
235
146
140
134
122
87
225
202
315
230
156
37
67
73
Wind (km/h)
15
NW
10
W
15
SW
30
SW
35
SW
30
WSW
15
W
15
WSW
15
WSW
20
SW
15
SW
15
SSE
30
W
30
WNW
30
NW
30
NW
30
NW
20
NW
30
W
35
W
25
W
Wind State
cross-off
cross
cross-on
on
cross-on
cross-on
cross-on
cross-on
cross-on
on
on
cross-on
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-on
cross-on
cross
High Tide
7:02AM8.34m
7:20PM8.77m
7:40AM8.58m
7:57PM8.86m
8:16AM8.60m
8:33PM8.72m
8:50AM8.41m
9:07PM8.36m
9:23AM8.05m
9:41PM7.85m
9:57AM7.56m
10:15PM7.24m
10:31AM6.98m
10:52PM6.59m
Low Tide
1:10PM0.27m
1:33AM0.05m
1:46PM0.09m
2:07AM0.02m
2:20PM0.12m
2:39AM0.20m
2:53PM0.34m
3:10AM0.55m
3:25PM0.72m
3:41AM1.03m
3:58PM1.23m
4:14AM1.59m
4:33PM1.81m
part cloud
clear
part cloud
cloud
rain showers
heavy rain
part cloud
clear
part cloud
clear
part cloud
part cloud
rain showers
clear
part cloud
cloud
cloud
cloud
cloud
cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:43
6:46
6:47
6:48
6:50
6:52
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:42
7:38
7:37
7:35
7:32
7:30
7:28
 mm
3
16
1
1
Temp °C
15
16
16
17
17
18
17
17
18
19
19
19
17
17
16
14
15
15
16
17
16
Feels °C
13
15
12
12
12
16
16
17
18
18
18
19
13
12
11
8
9
10
11
12
11
  • 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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How to use the Wavefinder 

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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Mewslade Bay surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


Information about the Mewslade Bay Surf forecast

The above surf forecast table for Mewslade Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Mewslade Bay can be found by selecting the local surf guide option on the grey menu. Our Mewslade Bay 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 (Mewslade Bay) 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 Mewslade Bay 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.

Mewslade Bay is 25 km (16 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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