Surf Forecasts:
Boiler Left surf forecast from 16 Sep 2026:
- Best quality surf: Tuesday 22 Sep, 7PM (local time) - 2ft (0.6m), 16s period, W swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 10PM (local time) - 7.5ft (2.3m), 7s period, WSW swell with 588 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 10AM (local time) - 2ft (0.6m), 9s period with W swell.
Best Forecast Surf Conditions for Boiler Left this week:
The surf forecast for Boiler Left over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 20) at 10AM. The primary swell is predicted to be 0.6m and 9s period with a secondary swell of 0.8m and 6s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Boiler Left in the next 16 days are 2.3m 7s and forecast to arrive on Friday (Sep 18) at 10PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Sun 20th Sep) | 2ft (0.6m) 9s |
| Best Surf | 7PM (Tue 22nd Sep) | 2ft (0.6m) 16s |
| Most Powerful | 10PM (Fri 18th Sep) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Boiler Left over the next 16 days.
The Lowdown
G’day, it’s Rusty. Let’s have a yarn about what’s coming. For the next 16 days, this stretch starts with a long, quiet gap – from now right through most of September there’s nothing worth wetsuiting up for. The first surfable moment shows up on Sunday the 20th morning, with clean, glassy conditions and a tiny 2ft west swell, but it’s weak and nothing to drive for. The entire first week is plagued by poor conditions, messy winds and small, gutless swell.
The standout pops up late. On Tuesday the 29th of September afternoon, Boiler Left finally gets a pulse – 7ft from the WSW with a 9-second period, and moderate energy behind it (718). That’s a solid size for this reef, and with cross-off winds out of the east at 12 mph, the surface should stay clean. The swell direction matches the optimum southwest, so the lines should set up proper on the reef. Water temp’s about normal for the time of year. It’s a long way out, so treat it like a good rumour – promising but not locked in.
The rest of the second week is tiny – mostly knee-high to waist-high west-southwest swell with clean offshore breezes, but only the morning of the 29th stands head and shoulders above the rest. The reef is inconsistent, but when it does fire, it’s worth the wait.
Rusty
Short Range ForecastLight rain (total 6mm), mostly falling on Wed night. Very mild (max 18°C on Fri night, min 14°C on Thu morning). Winds increasing (light winds from the NW on Wed morning, strong winds from the WSW by Fri afternoon). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat morning. Warm (max 20°C on Mon afternoon, min 15°C on Sat night). Winds decreasing (fresh winds from the WSW on Sat morning, 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 6 | W 7 | W 7 | W 7 | WSW 7 | WSW 6 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | W 9 | WSW 9 | WSW 7 | W 7 | WSW 7 | WSW 7 | W 12 | W 17 | W 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 384 | 302 | 173 | 306 | 303 | 226 | 186 | 247 | 542 | 456 | 405 | 173 | 57 | 101 | 40 | 24 | 16 | 17 | 71 | 142 | 159 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross-on | cross | cross-on | on | cross-on | on | cross-on | cross-on | glassy | cross-on | cross-off | glassy | glassy | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:15PM7.24m | 10:31AM6.98m | 10:52PM6.59m | 11:11AM6.37m | 11:36PM5.96m | 12:03PM5.79m | 00:42AM5.44m | 1:27PM5.41m | 2:25AM5.26m | 3:14PM5.52m | 3:58AM5.60m | 4:26PM6.04m | |||||||||
Low Tide | 3:58PM1.23m | 4:14AM1.59m | 4:33PM1.81m | 4:50AM2.19m | 5:15PM2.43m | 5:38AM2.77m | 6:18PM2.98m | 6:58AM3.22m | 8:06PM3.24m | 8:54AM3.23m | 9:47PM2.97m | 10:15AM2.80m | 10:48PM2.43m | ||||||||
 | |  | |  |  | |  | |  | |  |  | |  | | | | | | | |
 | 6:52 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — |
 | — | 7:30 | — | — | 7:28 | — | — | 7:24 | — | — | 7:22 | — | — | 7:21 | — | — | 7:17 | — | — | 7:15 | — |
mm | — | — | 4 | — | — | — | — | 2 | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 16 | 15 | 16 | 15 | 16 | 16 | 18 | 17 | 17 | 16 | 16 | 16 | 16 | 18 | 20 | 20 | 19 | 22 | 22 |
Feels °C | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 13 | 13 | 14 | 15 | 15 | 14 | 16 | 19 | 21 | 20 | 17 | 22 | 21 |
Swell 1 Height (m) Direction Period (s) | W 10 | — | W 10 | — | — | W 9 | W 7 | W 12 | W 12 | W 15 | W 14 | WSW 7 | WSW 6 | WSW 9 | WSW 7 | W 7 | WSW 7 | WSW 7 | W 12 | W 12 | W 11 |
| kJ | 384 | — | 72 | — | — | 106 | 162 | 27 | 12 | 5 | 4 | 173 | 44 | 101 | 40 | 24 | 16 | 17 | 71 | 99 | 110 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | W 9 | — | — | — | — | — | W 14 | W 9 | — | — | W 9 | W 9 | W 9 | WSW 19 | W 17 | W 15 |
| kJ | — | — | — | — | — | 87 | — | — | — | — | — | 4 | 57 | — | — | 7 | 6 | 2 | 36 | 142 | 159 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 14 | — | — | S 13 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 8 | 8 | — | — | 3 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | W 10 | WSW 6 | W 7 | W 7 | W 7 | WSW 7 | WSW 6 | WSW 7 | WSW 7 | WSW 7 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 302 | 173 | 306 | 303 | 226 | 186 | 247 | 542 | 456 | 405 | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 5 | 236 | 319 | 319 | 356 | 5 | 319 | 363 | 319 | 264 | 124 | 36 | 0 | 124 | 1 | 46 | 59 | 77 | 6 | 0 | 0 |
Best forecast wave conditions in Wales - Gower | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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Information about the Boiler Left Surf forecast
The above surf forecast table for Boiler Left provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Boiler Left can be found by selecting the local surf guide option on the grey menu. Our Boiler Left 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 (Boiler Left) 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 Boiler Left 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.
Boiler Left is 21 km (13 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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