
Surf Forecasts:
Hells Mouth (Porth Neigwl) surf forecast from 6 Aug 2026:
- Most powerful swell: Thursday 13 Aug, 10AM (local time) - 2.5ft (0.7m), 8s period, SW swell with 69 kJ wave energy.
Best Forecast Surf Conditions for Hells Mouth (Porth Neigwl) this week:
The most powerful waves expected at Hells Mouth (Porth Neigwl) in the next 16 days are 0.7m 8s and forecast to arrive on Thursday (Aug 13) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 2s period and expected on Monday (Aug 10) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Thu 13th Aug) | 2.5ft (0.7m) 8s |
Table - best surf conditions forecast for Hells Mouth (Porth Neigwl) over the next 16 days.
The Lowdown
Alright, let's get into it. This is Rusty, and I'm looking at the next couple of weeks for our stretch of coast. I've got to be straight with you – the charts aren't showing us much to get excited about. The whole 16-day window is a bit of a struggle, with only tiny, weak pulses of swell and onshore winds messing things up most of the time. The first real chance to even think about paddling out isn't until Thursday the 6th of August, but even then, it's a tough sell.
We'll kick things off at Hells Mouth (Porth Neigwl) . The water is sitting at 64°, which feels a touch warmer than normal for this time of year, so that's one small win. Thursday afternoon sees a tiny 2ft SW windswell, period is a short 6 seconds, and the combined energy is a weak 37. The wind is straight onshore from the SW at 6 mph, making it bumpy. It's poor, flat, and messy. Don't bother.
Friday the 7th is more of the same: 2ft SW swell with a 4-second period, energy down to 13, and the wind picks up to 12 mph onshore by the afternoon. This is a write-off. Saturday morning the 8th sees a weird 0.3ft, 11-second period pulse, but it's cross-onshore and basically non-existent. We're looking at a solid week of nothing worth mentioning.
The whole first week is a bust. We've got day after day of tiny, weak swells, often under 2ft, and the wind is almost always onshore or cross-onshore. There’s a brief moment on Wednesday morning the 12th with glassy conditions and a 0.7ft, 10-second period groundswell, but the energy is only 12 – you'd be floating out there, not surfing. The combined swell energy barely breaks double digits for days, with values like 2, 3, and 5. It's a long, flat spell.
Things stay quiet through the second week. We get a tiny bump on Thursday the 13th – a 2ft SW swell with an 8-second period, pushing the energy to 87. But it's cross-onshore again. Saturday the 15th and Sunday the 16th offer some clean, cross-offshore conditions with a light breeze, but the swell is a pathetic 0.7ft to 1.0ft. You'd need a longboard and a lot of patience.
Even as we push towards the 19th and 20th of August, the swell barely nudges up to 3ft, but the wind is strong and onshore or cross-shore, and the periods are short. There's a long-period 15-second pulse on the 20th, but it's a tiny 0.3ft with onshore wind – completely unsurfable. By the 21st, we get a 22 mph cross-shore wind and a 0.3ft 14-second period, combined energy of 21. Honestly, with those winds and the weak, bumpy conditions, this setup looks more interesting for kite surfing than paddle surfing.
There are no standout days. Nothing comes close to being worth highlighting. The forecast for the second week is just as poor as the first. We're in a flat spell, plain and simple. Keep the board in the car, but don't expect much for a while.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Thu night, min 14°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Tue morning, min 16°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | ||||||||||||||
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 6 | SW 4 | SW 4 | SW 5 | WSW 4 | SW 4 | SW 4 | WSW 7 | SW 7 | SW 6 | SW 6 | WSW 6 | SW 6 | WSW 6 | SW 6 | SW 6 | W 12 | WSW 10 | SW 10 | WSW 9 |
Wave Graph | ||||||||||||||||||||
16 | 28 | 7 | 7 | 7 | 5 | 3 | 5 | 11 | 10 | 6 | 4 | 6 | 3 | 2 | 2 | 3 | 10 | 24 | 30 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | glassy | cross-off | cross-off | cross-off | cross | cross-on | cross | glassy | cross-on | cross-on |
High Tide | 2:46AM3.52m | 3:25PM3.28m | 4:04AM3.34m | 4:47PM3.30m | 5:27AM3.38m | 6:03PM3.53m | 6:38AM3.60m | 7:06PM3.90m | 7:36AM3.87m | 7:59PM4.30m | 8:26AM4.13m | 8:47PM4.64m | ||||||||
Low Tide | 8:50PM1.25m | 9:48AM1.25m | 10:25PM1.35m | 11:26AM1.31m | 00:15AM1.24m | 12:58PM1.15m | 1:37AM0.91m | 2:04PM0.85m | 2:37AM0.52m | 2:57PM0.55m | 3:28AM0.17m | 3:43PM0.31m | ||||||||
— | — | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | |
— | 9:02 | — | — | 9:00 | — | 8:59 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:51 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 16 | 15 | 15 | 15 | 17 | 16 | 17 | 18 | 18 | 17 | 19 | 19 | 23 | 23 | 21 | 21 | 22 | 19 |
Feels °C | 12 | 13 | 14 | 12 | 12 | 12 | 15 | 14 | 15 | 17 | 18 | 15 | 17 | 17 | 21 | 22 | 21 | 20 | 19 | 19 |
Swell 1 Height (m) Direction Period (s) | NW 5 | — | — | SW 5 | WSW 4 | SW 11 | SW 4 | WSW 7 | SW 4 | SW 6 | SW 6 | WSW 6 | SW 6 | WSW 6 | SW 6 | SW 6 | SW 6 | WSW 10 | SW 10 | WSW 9 |
11 | — | — | 7 | 7 | 5 | 3 | 5 | 3 | 10 | 6 | 4 | 6 | 3 | 2 | 2 | 1 | 10 | 24 | 30 | |
Swell 2 Height (m) Direction Period (s) | SW 6 | W 12 | SW 12 | — | SW 12 | W 11 | SW 8 | WSW 7 | SW 7 | SW 12 | — | SW 4 | — | — | — | — | W 12 | SW 6 | — | WSW 4 |
16 | 3 | 6 | — | 5 | 2 | 3 | 5 | 11 | 6 | — | 1 | — | — | — | — | 3 | 1 | — | 3 | |
Swell 3 Height (m) Direction Period (s) | W 12 | — | — | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | W 12 | W 6 | — | — |
3 | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 1 | — | — | |
Wind waves Height (m) Direction Period (s) | WSW 4 | SW 4 | SW 4 | SW 3 | — | SW 4 | — | SW 4 | — | — | — | — | — | — | SE 2 | — | — | — | WSW 3 | SW 4 |
7 | 28 | 7 | 3 | — | 3 | — | 2 | — | — | — | — | — | — | 1 | — | — | — | 1 | 8 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 319 | 188 | 308 | 294 | 294 | 294 | 298 | 294 | 294 | 318 | 307 | 294 | 298 | 297 | 313 | 333 | 114 | 128 | 255 | 73 |
Best forecast wave conditions in Lleyn Peninsula | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
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Information about the Hells Mouth (Porth Neigwl) Surf forecast
The above surf forecast table for Hells Mouth (Porth Neigwl) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Hells Mouth (Porth Neigwl) can be found by selecting the local surf guide option on the grey menu. Our Hells Mouth (Porth Neigwl) 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 (Hells Mouth (Porth Neigwl)) 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 Hells Mouth (Porth Neigwl) 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.
Are you planning a holiday in Lleyn Peninsula? If you are looking for accommodation near Hells Mouth (Porth Neigwl), camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 32 km (20 miles) away. Other places in and around Lleyn Peninsula where you can find information about places to rent, and car hire include Anglesey which is 48 km (30 miles) away, Aberystwyth, Holyhead and Bangor.











