Surf Forecasts:
The Boiler surf forecast from 14 Sep 2026:
- Best quality surf: Friday 18 Sep, 7AM (local time) - 4ft (1.2m), 7s period, W swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 10PM (local time) - 3.5ft (1.1m), 10s period, W swell with 242 kJ wave energy.
- Next surfable swell (1★+): Friday 18 Sep, 7AM (local time) - 4ft (1.2m), 7s 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 Friday (Sep 18) at 7AM. The primary swell is predicted to be 1.2m and 7s period with a secondary swell of 0.1m and 16s. 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 1.1m 10s and forecast to arrive on Wednesday (Sep 16) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Fri 18th Sep) | 4ft (1.2m) 7s |
| Best Surf | 7AM (Fri 18th Sep) | 4ft (1.2m) 7s |
| Most Powerful | 10PM (Wed 16th Sep) | 3.5ft (1.1m) 10s |
Table - best surf conditions forecast for The Boiler over the next 16 days.
The Lowdown
Righto, let's have a look at what's on offer. To be straight with you, it's a pretty quiet stretch ahead for The Boiler. This is a reef setup, and while it can fire, the next couple of weeks look like they're gonna be a bit of a write-off for any proper sessions.
We kick things off from Monday the 14th of September, and honestly, it's not great. There's some small swell around, but the wind is all wrong – cross-on and bumpy. The water temp is sitting at 66°, which is much warmer than normal for this time of year, a real anomaly at +5°.
Tuesday the 15th sees a bit more size, with waves around 5ft from the W, but a strong 19 mph cross-off wind is gonna make it a messy, blown-out affair. Not worth paddling out for.
We get a slight lift on Wednesday the 16th morning. The swell is a touch smaller, around 3ft from the WSW, but the period stretches out to 10 seconds, and the wind is a clean cross-off. The combined energy is moderate (280). It's still only a marginal call, though. The rest of the week is a write-off – mostly messy, onshore, or just too weak.
Moving into the following week, the 21st and 22nd of September offer some glassy mornings, but the swell is tiny, barely 2ft to 2ft. There's a pulse on the 22nd afternoon with a 2ft WSW swell at an 11-second period, giving moderate energy (117) and clean conditions. It's surfable, but very ordinary.
The best of a bad bunch might just be that Friday the 25th of September. Glassy conditions in the morning and afternoon with a 2ft WSW swell at a 9-10 second period. It's clean, but again, it's tiny. The energy is weak (71). You'd be on a foamie or a longboard, just enjoying being out there.
From the 26th onwards, it drops right off into near-flatness with weak winds. The last few days of the month see a shift in wind to the east, but with a short, choppy 4ft E swell (4-second period). That's more of a kite-surfing breeze than a paddle-surfing swell. The combined energy is weak (52).
So, overall, there's no standout session here. The whole 16-day window is lean. The most promising, if you can call it that, is the morning of Wednesday the 16th or the glassy Friday the 25th, but you're really scraping the barrel. This reef needs a proper SW swell and the right winds to work, and we just aren't getting it.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Mon night. Very mild (max 18°C on Mon morning, min 13°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Thu morning. Very mild (max 17°C on Fri night, min 13°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 9 | WSW 6 | WSW 6 | W 7 | W 7 | W 7 | WSW 10 | WSW 10 | W 10 | W 6 | W 7 | W 7 | W 7 | WSW 7 | WSW 6 | WSW 6 | WSW 6 | WSW 6 | WSW 6 | WSW 7 | WSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 180 | 47 | 80 | 236 | 236 | 123 | 201 | 106 | 204 | 194 | 157 | 150 | 120 | 102 | 137 | 149 | 167 | 104 | 59 | 58 | 38 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | glassy |
High Tide | 9:17PM9.39m | 9:32AM9.11m | 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 | ||||||||
Low Tide | 2:58PM1.20m | 3:16AM1.44m | 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 | ||||||||
 |  |  | | |  |  | | |  | |  | |  | | | | | | | | |
 | 6:48 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — |
 | — | 7:34 | — | — | 7:30 | — | — | 7:29 | — | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — | — | 7:20 | — |
mm | 1 | — | 3 | — | — | — | — | — | 2 | 1 | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 18 | 18 | 18 | 16 | 16 | 16 | 15 | 15 | 16 | 16 | 16 | 14 | 16 | 16 | 17 | 17 | 17 | 17 | 18 | 18 | 17 |
Feels °C | 17 | 16 | 16 | 11 | 10 | 13 | 11 | 10 | 10 | 11 | 11 | 10 | 12 | 11 | 14 | 14 | 14 | 15 | 17 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | W 9 | W 9 | WSW 8 | — | — | W 8 | WSW 10 | WSW 10 | WSW 10 | W 10 | — | WSW 10 | W 7 | W 12 | W 12 | W 11 | — | W 10 | WSW 6 | WSW 7 | WSW 7 |
| kJ | 162 | 39 | 23 | — | — | 50 | 201 | 106 | 33 | 8 | — | 33 | 120 | 12 | 3 | 10 | — | 17 | 59 | 58 | 38 |
Swell 2 Height (m) Direction Period (s) | — | — | W 12 | — | — | WSW 8 | — | — | — | — | — | WSW 9 | W 9 | — | W 12 | — | — | W 14 | W 9 | W 15 | W 14 |
| kJ | — | — | 3 | — | — | 40 | — | — | — | — | — | 29 | 61 | — | 3 | — | — | 4 | 38 | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | W 17 | — | — | — | — | — | — | W 14 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 6 | — | — | — | — | — | — | 4 | — | — |
Wind waves Height (m) Direction Period (s) | WSW 9 | WSW 6 | WSW 6 | W 7 | W 7 | W 7 | W 6 | W 6 | W 10 | W 6 | W 7 | W 7 | — | WSW 7 | WSW 6 | WSW 6 | WSW 6 | WSW 6 | — | — | — |
| kJ | 180 | 47 | 80 | 236 | 236 | 123 | 79 | 65 | 204 | 194 | 157 | 150 | — | 102 | 137 | 149 | 167 | 104 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 133 | 133 | 133 | 360 | 360 | 48 | 9 | 320 | 320 | 417 | 360 | 48 | 0 | 273 | 133 | 133 | 133 | 74 | 133 | 133 | 14 |
Best forecast wave conditions in Wales - Gower | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.
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