Surf Forecasts:
The Boiler surf forecast from 15 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 1AM (local time) - 5.5ft (1.7m), 7s period, W swell with 320 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 1.7m 7s and forecast to arrive on Thursday (Aug 20) at 1AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Friday (Aug 21) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 20th Aug) | 5.5ft (1.7m) 7s |
Table - best surf conditions forecast for The Boiler over the next 16 days.
The Lowdown
Alright, let’s break it down. The Boiler, a reef break that’s inconsistent and fairly exposed to the southwest, is the only spot in play for the next 16 days. And truth be told, it’s a grim stretch. The water is sitting at about 69°, which is a whopping 8° warmer than usual for this time of year—that’s very unusual, and you’ll notice it if you get wet.
We start with nothing. Friday the 14th through Sunday the 17th of August is total junk: tiny waves under 2 ft, mostly cross-onshore or choppy winds, and the swell energy is weak (78) at best. Monday the 18th sees a slight bump to 4 ft on the morning with a clean cross-offshore breeze, but the period is a short 6 seconds, and the energy is moderate (178). Still, the surf is poor, no way around it.
The only real glimmer hits on Tuesday the 25th of August. The afternoon shows glassy conditions with a 4 ft SW swell and a period of 8 seconds. The combined energy is moderate (205), and it’s the first time we get a “glassy” note—clean, smooth, no wind chop. The swell direction is WSW, a bit off the optimum SW for The Boiler, but that glassy wind is a major positive. Still, the surf is described as “ordinary,” so don’t expect a dream session. If you’re desperate, that’s your spot.
After that, Wednesday the 26th through the end of the period on the 29th of August is mostly small, weak, and cross-onshore. Morning of the 28th shows a 5 ft groundswell with clean cross-offshore wind and moderate energy (276), but the period is still short at 8 seconds, and the swell is from WSW—again, not ideal. It’s better than most, but not a standout.
So, bottom line: there’s no real standout in this 16-day window. The Boiler is inconsistent, and conditions are mostly poor. If you’re a kiter, the extra wind and chop on some days might be more interesting than paddle surfing. But for a wave? Wait for a better forecast.
Stay patient,
Rusty
Short Range ForecastMostly dry. Warm (max 22°C on Fri afternoon, min 15°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Very mild (max 19°C on Tue morning, min 14°C on Tue night). Mainly fresh winds. | |||||||||||||||||||
Fri 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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 9 | W 8 | WSW 8 | W 8 | WSW 7 | WSW 7 | W 7 | WSW 7 | W 5 | WSW 5 | WSW 7 | W 6 | WSW 6 | WSW 6 | W 6 | WSW 6 | W 7 | W 7 | W 6 | W 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 78 | 48 | 22 | 29 | 18 | 18 | 27 | 5 | 20 | 28 | 54 | 95 | 56 | 25 | 98 | 245 | 320 | 171 | 78 | 23 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | off | off | cross-off | off | cross-off | cross | cross | cross | cross | cross | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off | off |
High Tide | 8:38PM9.89m | 9:01AM9.60m | 9:16PM9.76m | 9:37AM9.39m | 9:51PM9.46m | 10:10AM9.04m | 10:23PM9.02m | 10:41AM8.59m | 10:55PM8.48m | 11:12AM8.06m | 11:28PM7.89m | 11:51AM7.51m | 00:13AM7.29m | |||||||
Low Tide | 2:52AM0.81m | 3:01PM0.92m | 3:27AM0.99m | 3:34PM1.13m | 3:57AM1.32m | 4:04PM1.48m | 4:25AM1.75m | 4:35PM1.94m | 4:54AM2.27m | 5:08PM2.48m | 5:28AM2.83m | 5:52PM3.08m | ||||||||
 |  |  | | | | | | | | |  | |  | | |  | |  | | |
 | — | — | 6:00 | — | — | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — |
 | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — | — | 8:29 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | — | — | — | — | 1 | — |
Temp °C | 22 | 18 | 21 | 21 | 15 | 19 | 18 | 17 | 18 | 18 | 18 | 19 | 18 | 17 | 17 | 17 | 17 | 16 | 18 | 15 |
Feels °C | 21 | 16 | 17 | 16 | 10 | 15 | 14 | 17 | 17 | 14 | 17 | 15 | 14 | 16 | 11 | 11 | 11 | 11 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | W 9 | W 8 | WSW 8 | W 8 | WSW 7 | WSW 7 | W 7 | WSW 7 | W 5 | W 8 | — | W 6 | SW 17 | WSW 6 | SW 16 | W 16 | SW 16 | W 7 | SW 14 | W 6 |
| kJ | 78 | 48 | 22 | 29 | 18 | 18 | 17 | 5 | 20 | 6 | — | 78 | 11 | 25 | 11 | 5 | 10 | 171 | 8 | 23 |
Swell 2 Height (m) Direction Period (s) | — | W 11 | WSW 8 | — | NW 4 | NNW 3 | — | W 4 | W 7 | — | — | W 16 | — | SW 17 | — | — | — | SW 15 | — | WSW 9 |
| kJ | — | 2 | 6 | — | 2 | 1 | — | 1 | 4 | — | — | 5 | — | 12 | — | — | — | 8 | — | 15 |
Swell 3 Height (m) Direction Period (s) | — | — | W 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 |
| kJ | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 |
Wind waves Height (m) Direction Period (s) | — | NNW 3 | NNW 3 | NW 3 | NW 4 | — | W 7 | W 3 | — | WSW 5 | WSW 7 | W 6 | WSW 6 | — | W 6 | WSW 6 | W 7 | — | W 6 | — |
| kJ | — | 2 | 2 | 9 | 3 | — | 27 | 3 | — | 28 | 54 | 95 | 56 | — | 98 | 245 | 320 | — | 78 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 133 | 190 | 394 | 373 | 205 | 189 | 397 | 223 | 421 | 320 | 412 | 318 | 182 | 171 | 690 | 360 | 419 | 151 | 0 | 14 |
Best forecast wave conditions in Wales - Gower | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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 The Boiler 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 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.
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