
Surf Forecasts:
The Boiler surf forecast from 15 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 10AM (local time) - 4.5ft (1.3m), 10s period, W swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 7AM (local time) - 7ft (2.1m), 7s period, WSW swell with 408 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 10AM (local time) - 4.5ft (1.3m), 10s period with W swell.
Best Forecast Surf Conditions for The Boiler this week:
The surf forecast for The Boiler over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 16) at 10AM. The primary swell is predicted to be 1.3m and 10s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at The Boiler in the next 16 days are 2.1m 7s and forecast to arrive on Thursday (Sep 17) at 7AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Wed 16th Sep) | 4.5ft (1.3m) 10s |
| Best Surf | 10AM (Wed 16th Sep) | 4.5ft (1.3m) 10s |
| Most Powerful | 7AM (Thu 17th Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for The Boiler over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s shaping up for The Boiler.
Honestly, for the next week and a half, it’s a bit of a struggle. The wave energy is all over the place, but most of it comes with messy wind or just not enough size. The one window that stands out is late in the period – around September 29th. That’s where the real quality lives.
Right now, the water is sitting at 66° which is a solid 5° warmer than normal for this time of year. That’s notable – it feels more like late summer out there.
We kick off Tuesday the 15th and Wednesday the 16th with waist high swell, around 5 ft from the WSW, but a fresh 30 km/h west wind has it chopped and lumpy. Not worth paddling out for. On Wednesday morning the 16th, the wind backs off a touch to a 15 km/h cross-off from the northwest, and the period stretches to 10 seconds. The waves drop slightly to 4 ft, but it cleans right up. The combined energy pushes up to 332 (moderate). That’s your first real chance – clean lines, decent push, but inconsistent, so you’ll be sitting and waiting.
From Thursday the 17th through to the 22nd, we see a mix of cross and onshore winds. Sizes bump around the 5 ft to 6 ft mark on the 17th and 19th, but the west wind stays fresh (25-30 km/h) and the period drops to 7 seconds. That’s short-period wind swell – weak, lumpy, and uninspiring. Energy readings hover between 225 and 311 – moderate, but all of it messy. Not worth your time.
Sunday the 20th morning offers a brief reprieve – 3 ft, clean conditions with a light northwest cross-off at only 5 km/h. Energy is low at 131 though, and the waves are weak. A very grovelly session.
Now, Tuesday the 22nd morning is interesting. Glassy conditions with a 5 km/h east breeze, and while the height is only 2 ft from the west, the period jumps to 10 seconds, and energy hits 107. The afternoon sees a similar glassy setup with 2 ft and an 11-second period, energy up to 204. It’s small, but those long-period groundswell lines will wrap in clean. A longboard or a fish would be perfect.
Wednesday the 23rd morning keeps that glassy feel with a 2 ft, 13-second swell from the WSW, energy 178. But it’s inconsistent as always here – you’ll be scratching around.
Then we hit a big gap. From the 24th through to the 27th, it’s mostly small, weak, and cross-shore wind. Waves drop to 1 ft-2 ft, periods are short or just average, and energy falls below 100 most of the time. On Saturday the 26th, a 15-second period swell shows up from the WSW, but it’s only 1 ft and comes with a cross-onshore wind. Not rideable.
But then – Monday the 28th of September. The energy spikes to 2239. That’s strong, very strong. We’re looking at 12 ft from the WSW with a 10-second period. However, the wind is a moderate cross from the ESE at 20 km/h. The file says it’s predicted to be too big for this break. For a reef setup that’s inconsistent and rarely breaking, that’s a serious red flag. This is expert-only territory, if it’s even breaking properly. Not a beginner wave that day.
The true standout is Tuesday the 29th of September. Morning brings 7 ft from the WSW, 10-second period, and a light 10 km/h offshore north wind. Clean conditions. Combined energy is 727 – strong wave energy. This is the best call of the whole forecast. The afternoon glass off with 6 ft and a light SSE breeze at 5 km/h keeps it clean. Crowds are possible here sometimes, but on a Tuesday, you might get a few locals only.
After that, Wednesday the 30th deteriorates with a 25 km/h cross-on from the ESE and 5 ft – choppy again.
So, bottom line: the one to circle is Tuesday morning the 29th. That’s your best chance for clean, solid waves at The Boiler. Everything before that is either too small, too windy, or both.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Wed night. Very mild (max 16°C on Tue morning, min 13°C on Tue night). Winds increasing (light winds from the NW on Wed morning, strong winds from the WSW by Wed night). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Fri afternoon. Very mild (max 18°C on Sat morning, min 14°C on Sat night). Winds decreasing (fresh winds from the SW on Fri afternoon, calm by Sun night). | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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) | WSW 7 | WSW 7 | W 8 | W 10 | W 10 | WSW 6 | W 7 | W 7 | W 7 | W 7 | WSW 6 | WSW 7 | WSW 7 | WSW 7 | WSW 6 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 7 | W 8 |
Wave Graph | |||||||||||||||||||||
191 | 191 | 181 | 332 | 302 | 148 | 311 | 277 | 257 | 225 | 169 | 319 | 278 | 233 | 195 | 99 | 79 | 49 | 40 | 26 | 30 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross-off | cross | cross | cross-off | cross | cross-off | cross | cross-on | cross | cross | cross | cross | cross-off | cross | glassy | off | cross-off | cross-off |
High Tide | 9:45PM8.97m | 10:00AM8.68m | 10:13PM8.45m | 10:28AM8.16m | 10:42PM7.86m | 11:00AM7.58m | 11:19PM7.23m | 11:50AM6.98m | 00:25AM6.64m | 1:30PM6.60m | 2:17AM6.46m | 3:12PM6.83m | 3:50AM6.89m | ||||||||
Low Tide | 3:26PM1.54m | 3:42AM1.85m | 3:54PM2.00m | 4:07AM2.35m | 4:23PM2.56m | 4:36AM2.93m | 5:00PM3.19m | 5:15AM3.56m | 6:01PM3.82m | 6:38AM4.13m | 7:56PM4.09m | 8:47AM4.13m | 9:31PM3.73m | ||||||||
6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | |
— | 7:30 | — | — | 7:29 | — | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — | — | 7:20 | — | — | 7:17 | — | |
mm | — | — | — | — | — | 5 | — | — | — | — | 2 | 3 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 16 | 16 | 15 | 16 | 15 | 15 | 14 | 16 | 17 | 17 | 18 | 17 | 15 | 15 | 16 | 17 | 19 | 20 | 20 |
Feels °C | 12 | 11 | 13 | 12 | 9 | 10 | 10 | 8 | 9 | 10 | 13 | 13 | 14 | 14 | 13 | 13 | 13 | 18 | 20 | 20 | 20 |
Swell 1 Height (m) Direction Period (s) | W 11 | — | W 8 | W 10 | — | W 10 | — | — | W 9 | — | W 13 | W 12 | — | W 14 | W 10 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 7 | W 8 |
9 | — | 181 | 332 | — | 72 | — | — | 87 | — | 13 | 3 | — | 4 | 45 | 99 | 79 | 49 | 40 | 26 | 30 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 9 | W 14 | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 28 | 4 | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 13 | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | WSW 7 | WSW 7 | — | — | W 10 | WSW 6 | W 7 | W 7 | W 7 | W 7 | WSW 6 | WSW 7 | WSW 7 | WSW 7 | WSW 6 | — | — | — | — | — | — |
191 | 191 | — | — | 302 | 148 | 311 | 277 | 257 | 225 | 169 | 319 | 278 | 233 | 195 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 360 | 419 | 0 | 0 | 320 | 352 | 419 | 360 | 9 | 367 | 320 | 367 | 144 | 278 | 48 | 0 | 111 | 14 | 14 | 190 | 20 |
Best forecast wave conditions in Wales - Gower | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
Information about the The Boiler Surf forecast
The above surf forecast table for The Boiler provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at The Boiler can be found by selecting the local surf guide option on the grey menu. Our The Boiler 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 (The Boiler) 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 The Boiler 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.
The Boiler is 9 km (6 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.










