
Surf Forecasts:
The Boiler surf forecast from 16 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: Saturday 19 Sep, 1PM (local time) - 7ft (2.2m), 7s period, WSW swell with 542 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 2.2m 7s and forecast to arrive on Saturday (Sep 19) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| 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 | 1PM (Sat 19th Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for The Boiler over the next 16 days.
The Lowdown
Alright, this is Rusty, and I've got the goods on the local outlook for us. It’s looking like a bit of a waiting game for most of the stretch, but there is a small window that could deliver.
Alright, let’s cut to the chase. The Boiler is our only real option on the table for the next two weeks and a bit, but it’s a spot that doesn’t break all that often. We’re looking at a patchy run, with a lot of blown-out days and tiny waves in between. The water temp is pretty average for the time of year, nothing wild to report there.
The first real chance to get wet is on Wednesday the 16th of September. That morning is the only clear winner in the first week. We’ve got a 4 ft west swell rolling in with a 10-second period. The wind is a light 9 mph from the northwest, which is a cross-offshore breeze, keeping the lineup clean. The combined swell energy is sitting at 326 (moderate wave energy). It’s a short window though, as the afternoon gets messy. That's the best we've got in the near term, and it's a solid call for an intermediate.
After that, it’s grim. Thursday the 17th through Saturday the 19th is all blown out with strong winds and lumpy conditions, with the swell jumping from 6 ft to 7 ft but with a nasty period under 8 seconds. Not worth the effort.
We get a little glimmer of hope on Sunday the 20th of September. The morning is glassy, absolutely dead calm with a 3 ft groundswell from the WSW. That's a very long period of 10 seconds, which is the kind of energy that will wrap in nicely here. The combined energy is 158 (weak to moderate). It’s small, but if you want to go for a cruise, that's your moment.
Then we hit a real dry spell. From the 21st of September all the way through to the 26th, it's a total desert. Tiny waves, onshore or sideshore breezes, and zero energy. Just a flat spell, nothing going on.
We finally see a pulse of long-period groundswell to close out the month. Sunday the 27th of September morning is looking clean again with a 3 ft swell from the same WSW direction, period up to 12 seconds, and glassy winds. The energy climbs to 153. The afternoon is similar, with a 3 ft, 11-second swell and 217 energy. That’s a good, clean session for a Sunday hack.
And then on Monday the 28th of September, we get our one true standout. The morning is the pick of the entire forecast. We’ve got a 2 ft, 13-second groundswell from the west, with 232 moderate energy. But the wind? It’s an offshore 9 mph from the north. The Boiler will be clean, lined up, and workable. It's a small wave, but that period and the offshore wind should make for some fun, shapey walls. The afternoon is even cleaner but a little smaller and breezier with a 16 mph offshore. That early session on Monday the 28th is the one to pencil in.
Looking further ahead, the very last day of the month, Wednesday the 30th of September, shows a spike in size. 8 ft from the WSW with a short 8-second period, but the combined energy is 737 (strong wave energy) and the wind is cross-off from the ENE. It could be a bigger, powerful day, but that short period is a worry. It looks more like a kite-surfing setup than a pure paddle session for the Boiler's reef, given the size and power.
So, to wrap it up: The first week is a write-off except for Wednesday morning the 16th. The second week has a couple of small, clean windows on the 27th and the 28th. The Monday the 28th morning, with the offshore wind and long period, is your absolute best bet for a quality session. Call it a promising but uncertain call at this range.
Rusty out.
Short Range ForecastLight rain (total 5mm), mostly falling on Wed night. Very mild (max 16°C on Tue night, min 13°C on Tue night). Winds increasing (light winds from the NNW on Tue night, strong winds from the SW by Fri afternoon). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Very mild (max 19°C on Mon afternoon, min 14°C on Sat night). Winds decreasing (fresh winds from the WSW on Fri night, calm by Mon morning). | ||||||||||||||||||||
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 5 | W 7 | W 7 | W 7 | W 7 | WSW 6 | WSW 7 | WSW 7 | WSW 8 | WSW 7 | WSW 10 | WSW 9 | WSW 7 | W 7 | W 7 | WSW 7 | WSW 7 | W 11 | W 11 |
Wave Graph | |||||||||||||||||||||
326 | 302 | 98 | 303 | 245 | 220 | 166 | 165 | 440 | 440 | 494 | 160 | 154 | 103 | 38 | 24 | 24 | 15 | 9 | 66 | 82 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross-off | cross | cross-off | cross | cross-on | cross-on | cross-on | cross | cross | glassy | cross | glassy | glassy | cross | glassy | cross-on | glassy | cross |
High Tide | 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 | 4:24PM7.46m | ||||||||
Low Tide | 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 | 10:08AM3.56m | 10:35PM3.06m | ||||||||
6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | 7:01 | — | — | |
— | 7:29 | — | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — | — | 7:20 | — | — | 7:17 | — | — | 7:15 | — | |
mm | — | — | 4 | — | — | — | — | 1 | 1 | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 16 | 15 | 16 | 14 | 16 | 16 | 17 | 17 | 18 | 16 | 16 | 17 | 16 | 17 | 19 | 19 | 19 | 21 | 21 |
Feels °C | 13 | 10 | 10 | 10 | 10 | 9 | 11 | 10 | 12 | 13 | 15 | 14 | 14 | 15 | 16 | 17 | 19 | 19 | 19 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | W 10 | — | W 10 | — | — | W 9 | W 7 | W 13 | W 12 | W 16 | W 14 | WSW 7 | WSW 10 | WSW 9 | WSW 7 | W 7 | W 7 | WSW 7 | WSW 7 | W 11 | W 11 |
326 | — | 50 | — | — | 85 | 162 | 13 | 3 | 5 | 4 | 160 | 154 | 103 | 38 | 24 | 24 | 15 | 9 | 66 | 82 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | W 10 | — | — | — | — | WSW 10 | W 14 | — | — | — | — | — | W 10 | WSW 18 | WSW 16 |
— | — | — | — | — | — | 50 | — | — | — | — | 34 | 4 | — | — | — | — | — | 7 | 61 | 81 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 14 | — | — | — | — | — | — | W 13 | WSW 18 | — |
— | — | — | — | — | — | — | — | — | — | — | 8 | — | — | — | — | — | — | 3 | 31 | — | |
Wind waves Height (m) Direction Period (s) | — | W 10 | WSW 5 | W 7 | W 7 | W 7 | WSW 7 | WSW 6 | WSW 7 | WSW 7 | WSW 8 | — | — | — | — | — | — | — | — | — | — |
— | 302 | 98 | 303 | 245 | 220 | 166 | 165 | 440 | 440 | 494 | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 224 | 320 | 419 | 320 | 9 | 367 | 308 | 308 | 278 | 144 | 19 | 0 | 0 | 14 | 20 | 157 | 126 | 20 | 0 | 1 |
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.










