Surf Forecasts:
Mewslade Bay surf forecast from 17 Aug 2026:
- Best quality surf: Thursday 20 Aug, 7PM (local time) - 3ft (0.9m), 6s period, W swell with offshore winds.
- Most powerful swell: Wednesday 19 Aug, 10PM (local time) - 7ft (2.2m), 7s period, WSW swell with 500 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 7PM (local time) - 3ft (0.9m), 6s period with W 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 Thursday (Aug 20) at 7PM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.4m and 9s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Mewslade Bay in the next 16 days are 2.2m 7s and forecast to arrive on Wednesday (Aug 19) at 10PM. 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 Thursday (Aug 20) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Thu 20th Aug) | 3ft (0.9m) 6s |
| Best Surf | 7PM (Thu 20th Aug) | 3ft (0.9m) 6s |
| Most Powerful | 10PM (Wed 19th Aug) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Mewslade Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what’s on the menu down at Mewslade Bay. Gotta be straight with you from the off – it’s a tough stretch for waves around here. The water is sitting at a very unusual 69°, which is much warmer than normal for this time of year, but that’s about the only thing that’s firing.
The pattern for the next 16 days is a long, drawn-out lull with only brief, marginal windows. The first half of the period, from now until the end of the month, is looking poor. There’s a real gap from Monday the 19th all the way through to Thursday the 22nd of August where the swell is tiny, under 2ft, and not worth mentioning. The wind does go clean and offshore on the 23rd and 24th, but with waves barely reaching 1ft, you’d be bobbing around on a lake.
The only real standout, and I mean the *only* one worth circling on your calendar, is the morning of Friday, the 28th of August. We get a pulse of chest to head-high swell coming in from the WSW at 6ft with a 10-second period (moderate wave energy, reading 638). The wind is a gentle cross-onshore, so it won’t be glassy but it’s not a total washout, and the data says it’s marginal. This is better suited to the intermediate crew, as beginners might find the size a bit intimidating. Keep an eye on that tide window.
Speaking of the 28th, the afternoon session is a similar story at 6ft but with that same light cross-onshore breeze. The morning is the pick. The rest of the month continues messy, with the wind picking up again and the quality dropping off.
Into the second week, we see another pulse on Sunday morning, the 1st of September, with a 6ft SW swell (513 energy) but a fair bit of cross-shore wind. It’s another marginal window if you’re desperate, but nothing to write home about. The truth is, for most of this outlook, the conditions are poor, with strong winds and lumpy chop. Mewslade is an exposed spot, and when the wind is on it or cross-on, it gets pretty ugly.
Don’t hold your breath for the first week. If you’re really keen, pin your hopes on that Friday the 28th morning. Otherwise, it’s a blank run and we wait for the forecasts to change.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Wed night. Very mild (max 18°C on Mon morning, min 14°C on Wed night). Winds increasing (light winds from the WNW on Mon morning, fresh winds from the WSW by Wed afternoon). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Thu afternoon. Very mild (max 18°C on Thu afternoon, min 13°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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) | W 6 | W 6 | WSW 4 | W 7 | W 6 | WSW 6 | W 7 | WSW 7 | W 8 | WSW 7 | W 7 | WSW 9 | W 8 | WSW 8 | WSW 9 | WSW 10 | WSW 10 | WSW 9 | W 9 | WSW 9 | WSW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 30 | 40 | 20 | 124 | 94 | 147 | 212 | 268 | 496 | 214 | 110 | 79 | 36 | 22 | 15 | 19 | 19 | 17 | 14 | 16 | 16 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross-on | cross | cross-on | cross-on | cross | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | off |
High Tide | 10:17PM7.94m | 10:35AM7.48m | 10:54PM7.30m | 11:13AM6.91m | 11:35PM6.64m | 11:56AM6.32m | 00:23AM6.02m | 12:52PM5.80m | 1:31AM5.54m | 2:16PM5.50m | 3:07AM5.42m | 3:51PM5.63m | |||||||||
Low Tide | 4:02PM0.76m | 4:23AM1.02m | 4:38PM1.28m | 4:59AM1.59m | 5:17PM1.85m | 5:39AM2.19m | 6:04PM2.43m | 6:31AM2.73m | 7:09PM2.91m | 7:50AM3.10m | 8:44PM3.11m | 9:29AM3.09m | 10:16PM2.89m | ||||||||
 |  |  | | | | |  |  | | | | | |  | | | | | | | |
 | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — |
 | — | 8:36 | — | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:28 | — | — | 8:25 | — | — | 8:23 | — |
mm | — | — | — | — | — | — | — | 2 | 4 | — | 3 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 16 | 18 | 15 | 15 | 17 | 14 | 17 | 17 | 16 | 18 | 20 | 15 |
Feels °C | 15 | 14 | 16 | 15 | 14 | 14 | 11 | 11 | 11 | 13 | 14 | 11 | 13 | 14 | 10 | 15 | 12 | 12 | 15 | 15 | 11 |
Swell 1 Height (m) Direction Period (s) | W 6 | W 8 | W 17 | W 7 | SW 17 | SW 17 | SW 16 | — | SW 16 | WSW 7 | W 7 | WSW 9 | W 8 | WSW 8 | WSW 9 | WSW 10 | WSW 10 | WSW 9 | W 9 | WSW 9 | WNW 3 |
| kJ | 30 | 6 | 5 | 124 | 11 | 12 | 10 | — | 10 | 214 | 110 | 79 | 36 | 22 | 15 | 19 | 19 | 17 | 14 | 16 | 1 |
Swell 2 Height (m) Direction Period (s) | W 7 | SW 18 | — | SW 16 | — | — | — | — | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | W 11 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | WSW 9 |
| kJ | 1 | 12 | — | 11 | — | — | — | — | 10 | 8 | 8 | 8 | 7 | 7 | 2 | 9 | 8 | 8 | 8 | 8 | 16 |
Swell 3 Height (m) Direction Period (s) | W 18 | — | — | — | — | — | — | — | — | SW 15 | — | SW 14 | SW 16 | SW 16 | SW 13 | SW 15 | — | S 12 | — | — | SW 14 |
| kJ | 6 | — | — | — | — | — | — | — | — | 8 | — | 8 | 11 | 10 | 7 | 9 | — | 3 | — | — | 8 |
Wind waves Height (m) Direction Period (s) | — | W 6 | WSW 4 | — | W 6 | WSW 6 | W 7 | WSW 7 | W 8 | — | NW 3 | N 4 | — | NNW 6 | NW 3 | N 3 | — | NW 3 | — | W 3 | — |
| kJ | — | 40 | 20 | — | 94 | 147 | 212 | 268 | 496 | — | 6 | 10 | — | 3 | 2 | 1 | — | 2 | — | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 408 | 437 | 358 | 141 | 695 | 398 | 415 | 365 | 44 | 1 | 1 | 0 | 4 | 299 | 299 | 261 | 288 | 48 | 78 | 397 | 299 |
Best forecast wave conditions in Wales - Gower | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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