
Surf Forecasts:
Mewslade Bay surf forecast from 16 Sep 2026:
- Best quality surf: Sunday 20 Sep, 10AM (local time) - 3.5ft (1.0m), 10s period, WSW swell with glassy winds.
- Most powerful swell: Saturday 19 Sep, 1PM (local time) - 8ft (2.4m), 7s period, WSW swell with 607 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 4AM (local time) - 3.5ft (1.0m), 7s 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 Sunday (Sep 20) at 4AM. The primary swell is predicted to be 1.0m and 7s period with a secondary swell of 0.6m and 10s. 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 2.4m 7s and forecast to arrive on Saturday (Sep 19) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Sunday (Sep 20) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Sun 20th Sep) | 3.5ft (1.0m) 7s |
| Best Surf | 10AM (Sun 20th Sep) | 3.5ft (1.0m) 10s |
| Most Powerful | 1PM (Sat 19th Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Mewslade Bay over the next 16 days.
The Lowdown
G’day, Rusty here again. Let’s break down the surf over at Mewslade Bay, and trust me, it’s a bit of a mixed bag. The first couple of days are going to be a battle.
Right off the bat, the 16th and 17th are pretty rough. We’ve got a solid 1.4m to 1.8m W swell, but the wind is cross and cross-off, blowing 25 to 30 km/h. That makes for lumpy, cross-choppy conditions. The energy is moderate (384 down to 269), but it’s going to be messy. Nothing to get excited about.
The 18th and 19th keep the wind onshore and the waves get bigger, up to 2.2m by Saturday. But the period drops to 6-7 seconds, so it’s a jumbled-up mess. The energy spikes to 547-574 on the 19th, but with that cross-on wind, it’s going to be a washing machine. Not your friend.
Then we get a bit of a reprieve. The 20th Sunday morning, the wind goes glassy, swell settles at 1.0m with a 10-second interval. It’s clean and fun, a real session for the log. The energy is moderate (204), so there’s a bit of push, but it’s super clean. That’s your first genuine window.
The 21st and 22nd are small, with the swell dropping to 0.4-0.5m. There’s a tiny blip on the 22nd afternoon with a 0.5m, 11-second period, but it’s very marginal. You might catch a few, but you’ll be scratching for them.
The 23rd and 24th are pretty much flat, with the swell down to 0.3-0.4m and energy levels in the tank (16-33). The 25th and 26th are the same story, just tiny and weak. It’s a real dead spell.
Then, the 27th Sunday morning, things start to wake up. We’ve got 0.9m of WSW swell with a 11-second period, and the wind is light offshore. It’s clean, but the energy is still moderate (189). Decent enough for a grovel.
But hold on, the 28th Monday morning is where it gets properly interesting. The swell is still only 0.9m, but the period jumps to 13 seconds – that’s proper groundswell. The wind is a fresh offshore from the N at 30 km/h. That’s a beautiful, clean, lined-up wave. The energy is moderate (286), but with that long period, the quality is there. The 29th Tuesday is similar, with a 0.8m, 11-second swell and clean cross-off winds. Good, but a touch weaker.
Now, for the big one: the 30th September, Wednesday morning. The swell jumps back up to 2.3m from the WSW, but the period drops back to 8 seconds. The energy is pumping at 737 – that’s strong. The wind is a moderate offshore from the E. That’s a powerful, heavy wave. It’s not for the faint-hearted. At 2.3m, it’s pushing the limits for most, but for the experts, it’s a chance at something memorable. The afternoon drops to 1.9m and stays clean-ish.
After that, the 1st of October is back to small, 0.9m and weak energy.
So, highlighting the real standouts: the 28th Monday morning is your pick for a clean, long-period groundswell with offshore wind – that’s the one you want to plan for. Then the 30th Wednesday morning is a big, powerful beast, but it’s for advanced surfers only.
Water temp is about average for the time of year, nothing unusual.
Alright, that’s the rundown. It’s a bit of a wait for the good stuff, but when it comes, it comes with quality.
Rusty, signing off.
Short Range ForecastLight rain (total 4mm), mostly falling on Wed night. Very mild (max 16°C on Tue night, min 14°C on Tue night). Winds increasing (light winds from the NW on Wed morning, strong winds from the SW by Fri afternoon). | Days 4-6 Weather SummarySome drizzle, heaviest during Fri night. Very mild (max 18°C on Sat afternoon, min 14°C on Sat night). Winds decreasing (fresh winds from the WSW on Fri night, calm by Sun night). | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||
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 10 | W 10 | WSW 6 | W 7 | W 7 | W 7 | WSW 7 | WSW 6 | WSW 7 | WSW 7 | WSW 8 | WSW 7 | WSW 10 | WSW 9 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 11 | W 16 |
Wave Graph | |||||||||||||||||||||
384 | 302 | 143 | 348 | 269 | 250 | 191 | 206 | 498 | 542 | 570 | 156 | 193 | 108 | 38 | 27 | 27 | 16 | 16 | 65 | 122 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | glassy | cross-on | glassy | glassy | cross | glassy | cross | glassy | cross-off |
High Tide | 9:57AM7.56m | 10:15PM7.24m | 10:31AM6.98m | 10:52PM6.59m | 11:11AM6.37m | 11:36PM5.96m | 12:03PM5.79m | 00:42AM5.44m | 1:27PM5.41m | 2:25AM5.26m | 3:14PM5.52m | 3:58AM5.60m | 4:26PM6.04m | ||||||||
Low Tide | 3:58PM1.23m | 4:14AM1.59m | 4:33PM1.81m | 4:50AM2.19m | 5:15PM2.43m | 5:38AM2.77m | 6:18PM2.98m | 6:58AM3.22m | 8:06PM3.24m | 8:54AM3.23m | 9:47PM2.97m | 10:15AM2.80m | 10:48PM2.43m | ||||||||
6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — | |
— | 7:30 | — | — | 7:28 | — | — | 7:25 | — | — | 7:22 | — | — | 7:21 | — | — | 7:19 | — | — | 7:15 | — | |
mm | — | — | 3 | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 15 | 16 | 15 | 16 | 15 | 16 | 16 | 17 | 17 | 18 | 16 | 15 | 16 | 16 | 16 | 18 | 18 | 18 | 21 | 21 |
Feels °C | 11 | 10 | 10 | 9 | 9 | 10 | 10 | 9 | 13 | 13 | 15 | 14 | 14 | 14 | 16 | 17 | 18 | 18 | 18 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | W 10 | — | W 10 | — | — | W 9 | W 7 | W 12 | W 12 | W 16 | W 14 | WSW 7 | WSW 10 | WSW 9 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 11 | W 10 |
384 | — | 50 | — | — | 85 | 162 | 27 | 12 | 5 | 4 | 156 | 193 | 108 | 38 | 27 | 27 | 16 | 16 | 65 | 80 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | W 10 | — | — | — | — | W 9 | SW 14 | S 14 | WSW 9 | S 13 | — | W 13 | W 10 | WSW 18 | W 16 |
— | — | — | — | — | — | 50 | — | — | — | — | 45 | 8 | 4 | 17 | 3 | — | 3 | 7 | 61 | 122 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | W 14 | W 13 | — | — | — | — | — | W 12 | — | — |
— | — | — | — | — | — | — | — | — | — | — | 4 | 3 | — | — | — | — | — | 3 | — | — | |
Wind waves Height (m) Direction Period (s) | — | W 10 | WSW 6 | W 7 | W 7 | W 7 | WSW 7 | WSW 6 | WSW 7 | WSW 7 | WSW 8 | — | N 3 | — | — | — | — | — | — | — | — |
— | 302 | 143 | 348 | 269 | 250 | 191 | 206 | 498 | 542 | 570 | — | 1 | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 10 | 241 | 322 | 419 | 322 | 10 | 365 | 311 | 311 | 260 | 141 | 1 | 0 | 19 | 4 | 4 | 148 | 118 | 4 | 0 | 0 |
Best forecast wave conditions in Wales - Gower | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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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.










