Surf Forecasts:
The Boiler surf forecast from 29 Aug 2026:
- Most powerful swell: Friday 4 Sep, 4AM (local time) - 10ft (3.0m), 9s period, W swell with 1,423 kJ wave energy.
Best Forecast Surf Conditions for The Boiler this week:
The most powerful waves expected at The Boiler in the next 16 days are 3.0m 9s and forecast to arrive on Friday (Sep 04) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Fri 4th Sep) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for The Boiler over the next 16 days.
The Lowdown
Alright, grab a coffee and settle in, this is a long one. Rusty here.
Honestly, looking at the next 16 days, it’s a tough period for The Boiler (reef). The water is sitting at 69°, which is a whopping 8° warmer than normal for this time of year – super unusual. The problem is that while there’s plenty of energy in the water, the wind is just not playing ball. We’re looking at a lot of cross-on and cross-off slop that’s ruining the shape. The first real chance of anything decent doesn’t roll in until Monday morning, the 31st of August. The swell picks up to a clean 7ft from the west, with a moderate 9-second period, and the wind shifts to a cross-off. The combined energy is moderate at 721, but it’s still only a marginal call. The conditions are clean, but it’s not a standout.
The next morning on Tuesday, the 1st of September, the swell drops right back to 3ft with a short period, and the wind goes cross-shore, making it choppy. Not great.
We get a slight bump on Wednesday morning, the 2nd, but it’s a 6ft swell with a short 6-second period and fresh cross-onshore winds – lumpy and messy. Thursday is the same story: strong cross-shore winds and bumpy surf.
Friday morning, the 4th of September, is the first real standout. The swell is 8ft from the west with a 9-second period, and the wind is a cross-off, giving us clean conditions. The energy is strong at 963. This is a good one for the experts, but at 8ft it’s pushing into the big territory, so it’s not for the faint-hearted. It’s likely to be a bit crowded, but for a reef break with that kind of size and clean wind, it’s worth the paddle.
Then we hit a dry patch. From the 5th to the 10th of September, the surf is poor or marginal. The wind is mostly onshore or cross-shore, and the swell is inconsistent and small. There’s a glimmer on Thursday afternoon, the 10th, with a 4ft swell and light wind, but it’s marginal.
The 11th and 12th of September see a massive pulse of energy. On Friday the 11th, the swell is 6ft from the WSW with a very long 12-second period, and the combined energy is a massive 1520 – strong. But the wind is fresh cross-onshore, making it lumpy. The long period means the reef might handle it well, but the wind is a killer. Saturday the 12th is even bigger, with a 10ft swell and a long period, energy hitting 1922, but the wind is a near gale 31 mph cross-shore – it’s going to be a mess. Only for the most experienced.
The final chance is on Sunday morning, the 13th of September. The swell drops to 6ft with a 12-second period, the wind is cross-off, and the energy is strong at 1087. It’s clean and maybe the best of the entire run. It’s a marginal call, but it’s the only one that combines size, clean wind, and a solid period.
So, the bottom line: The best on offer is Friday morning, the 4th of September, with a clean 8ft west swell, and Sunday morning, the 13th of September, with a clean 6ft west-southwest swell. Both are for skilled surfers. The rest is a bit of a write-off. The Boiler is inconsistent and rarely breaks clean, so this blank run is a bit more normal for the area. Forecasts can change, but right now, it’s a waiting game.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Sun night. Very mild (max 19°C on Sat afternoon, min 14°C on Mon morning). Winds increasing (light winds from the WSW on Sat afternoon, fresh winds from the SW by Sun night). | Days 5-7 Weather SummaryModerate rain (total 10mm), heaviest on Wed night. Very mild (max 18°C on Wed afternoon, min 14°C on Thu night). Winds increasing (light winds from the WSW on Tue night, strong winds from the SW by Wed morning). | |||||||||||||||||||
Sat 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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) | SW 7 | WSW 9 | WSW 9 | WSW 8 | WSW 8 | W 9 | WSW 9 | WSW 10 | WSW 9 | WSW 8 | WSW 5 | WSW 6 | WSW 7 | WSW 8 | WSW 8 | WSW 7 | W 9 | W 9 | W 8 | WSW 7 |
Wave Graph | ||||||||||||||||||||
93 | 435 | 267 | 326 | 567 | 721 | 528 | 235 | 111 | 125 | 36 | 189 | 544 | 414 | 357 | 445 | 1345 | 963 | 565 | 220 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross | cross-off | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | cross | cross |
High Tide | 8:09PM9.52m | 8:25AM9.34m | 8:42PM9.58m | 8:57AM9.36m | 9:15PM9.49m | 9:28AM9.22m | 9:48PM9.24m | 10:01AM8.93m | 10:23PM8.83m | 10:38AM8.51m | 11:04PM8.29m | 11:24AM7.96m | 00:02AM7.65m | |||||||
Low Tide | 2:12AM1.13m | 2:23PM1.21m | 2:43AM1.09m | 2:54PM1.23m | 3:14AM1.21m | 3:24PM1.39m | 3:45AM1.48m | 3:57PM1.70m | 4:20AM1.90m | 4:35PM2.16m | 5:02AM2.45m | 5:26PM2.76m | ||||||||
— | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | |
8:09 | — | — | 8:07 | — | — | 8:06 | — | — | 8:02 | — | — | 8:00 | — | — | 7:59 | — | — | 7:57 | — | |
mm | 1 | — | 3 | 3 | 7 | — | — | — | 1 | — | 1 | 2 | 1 | 6 | — | — | — | — | — | — |
Temp °C | 19 | 17 | 18 | 17 | 16 | 15 | 16 | 16 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 17 | 16 | 16 | 16 | 17 |
Feels °C | 19 | 16 | 13 | 11 | 10 | 9 | 11 | 13 | 15 | 13 | 15 | 12 | 13 | 14 | 13 | 10 | 9 | 10 | 10 | 13 |
Swell 1 Height (m) Direction Period (s) | — | WSW 9 | WSW 9 | WSW 8 | — | — | — | WSW 10 | W 9 | W 18 | W 8 | W 16 | — | W 15 | SW 15 | — | — | — | — | WSW 7 |
— | 435 | 197 | 76 | — | — | — | 235 | 101 | 6 | 12 | 5 | — | 4 | 8 | — | — | — | — | 220 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | SW 16 | — | — | — | — | — | — | — | — | SW 14 |
— | — | — | — | — | — | — | — | — | — | 10 | — | — | — | — | — | — | — | — | 8 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | W 16 | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | 5 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SW 7 | — | WSW 9 | WSW 8 | WSW 8 | W 9 | WSW 9 | — | WSW 9 | WSW 8 | WSW 5 | WSW 6 | WSW 7 | WSW 8 | WSW 8 | WSW 7 | W 9 | W 9 | W 8 | — |
93 | — | 267 | 326 | 567 | 721 | 528 | — | 111 | 125 | 36 | 189 | 544 | 414 | 357 | 445 | 1345 | 963 | 565 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 48 | 49 | 396 | 431 | 49 | 360 | 49 | 48 | 133 | 133 | 157 | 903 | 308 | 367 | 597 | 360 | 360 | 420 | 49 | 82 |
Best forecast wave conditions in Wales - Gower | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
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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.











