Surf Forecasts:
Hells Mouth (Porth Neigwl) surf forecast from 3 Sep 2026:
- Most powerful swell: Monday 7 Sep, 1PM (local time) - 3.5ft (1.1m), 13s period, WSW swell with 414 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 1.1m 13s and forecast to arrive on Monday (Sep 07) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Saturday (Sep 05) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Mon 7th Sep) | 3.5ft (1.1m) 13s |
Table - best surf conditions forecast for Hells Mouth (Porth Neigwl) over the next 16 days.
The Lowdown
Alright, I’ll call it how I see it. Sixteen days out at Hells Mouth (Porth Neigwl), and honestly, there’s nothing worth paddling out for. None of these days gets a nod from me. It’s one of those stretches where you just leave the boards in the car.
Right now, starting Thursday the 3rd, it’s a mess. A 30 to 40 km/h onshore wind is chewing up a 5ft swell from the southwest with a short, weak period of 6 to 7 seconds. The energy’s moderate (193 on the morning), but with that wind, it’s just blown-out. Water’s sitting at 65°, which is a touch warmer than average for September.
Friday the 4th is more of the same. That west wind is still howling across the beach, making a 5ft swell from the west-southwest look like a washing machine on spin cycle. The energy stays moderate, but quality is poor.
Saturday the 5th, the swell drops right off to a weak 2ft from the southwest. Combined energy is a weak 56 in the morning. It’s clean with a light breeze, but there’s no power.
From Sunday the 6th through Thursday the 10th, the wind stays ugly – cross-on to cross-shore – and the waves stay small and lumpy. The closest we get to anything is Thursday afternoon when the wind goes glassy and there’s a 4ft swell from the southwest with a 7-second period. It’s described as surfable but very ordinary. That’s not a call to action.
From Friday the 11th all the way through Friday the 18th, it flatlines. Swell heights are below 2ft, mostly 1ft or less. The combined energy drops into single digits. Even when a long-period groundswell of 19 seconds shows up on Tuesday the 15th, the swell is only 1ft. It’s a ghost.
No standouts. No days worth planning for. This is a dead run for the area, and it happens. Forecasts can flip, but as of now, leave the board bag in the garage.
- Rusty
Short Range ForecastModerate rain (total 10mm), heaviest on Thu night. Very mild (max 17°C on Thu morning, min 14°C on Fri morning). Winds decreasing (strong winds from the SW on Thu night, light winds from the W by Sat morning). | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Mon night. Warm (max 21°C on Sun afternoon, min 13°C on Mon night). Mainly strong winds. | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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) | SW 7 | SW 6 | SW 6 | WSW 8 | WSW 6 | W 5 | SW 6 | SW 6 | SW 4 | SW 5 | SSW 6 | SW 6 | WSW 5 | SW 5 | WSW 7 | W 6 | W 6 | W 6 | W 5 | SW 5 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 171 | 155 | 167 | 318 | 143 | 120 | 39 | 28 | 9 | 24 | 77 | 137 | 99 | 106 | 189 | 154 | 141 | 197 | 97 | 51 | 312 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on |
High Tide | 12:53PM3.82m | 1:20AM3.76m | 1:48PM3.50m | 2:24AM3.37m | 3:01PM3.24m | 3:49AM3.13m | 4:32PM3.23m | 5:21AM3.19m | 5:54PM3.50m | 6:32AM3.46m | 6:56PM3.92m | 7:27AM3.80m | 7:46PM4.33m | ||||||||
Low Tide | 7:31PM1.04m | 8:15AM1.21m | 8:50PM1.27m | 9:45AM1.42m | 10:41PM1.35m | 11:30AM1.41m | 00:19AM1.15m | 12:52PM1.16m | 1:31AM0.77m | 1:53PM0.82m | 2:25AM0.38m | 2:41PM0.50m | 3:11AM0.08m | ||||||||
 | |  | |  |  |  | |  | | |  | |  |  |  | | | | |  | |
 | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — |
 | — | 8:02 | — | — | 8:00 | — | — | 7:58 | — | — | 7:55 | — | — | 7:53 | — | — | 7:51 | — | — | 7:49 | — |
mm | — | — | 10 | — | — | — | — | — | — | — | — | — | — | 1 | 9 | 1 | 1 | — | — | — | 5 |
Temp °C | 17 | 17 | 17 | 15 | 17 | 16 | 14 | 15 | 15 | 18 | 21 | 18 | 15 | 15 | 15 | 14 | 15 | 15 | 14 | 15 | 17 |
Feels °C | 13 | 12 | 11 | 8 | 10 | 9 | 13 | 12 | 11 | 13 | 18 | 14 | 11 | 9 | 10 | 6 | 9 | 8 | 9 | 9 | 12 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 14 | — | NW 5 | SW 14 | SW 6 | NW 4 | SW 4 | SW 5 | SW 13 | — | WSW 13 | — | — | — | — | — | — | NW 5 | — |
| kJ | — | — | 8 | — | 16 | 8 | 39 | 5 | 9 | 24 | 6 | — | 99 | — | — | — | — | — | — | 12 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | NW 5 | SW 13 | WSW 6 | SW 13 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 15 | 7 | 4 | 7 | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 14 | SW 13 | SW 13 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 7 | 7 | 7 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 7 | SW 6 | SW 6 | WSW 8 | WSW 6 | W 5 | — | SW 6 | SSE 3 | SSE 3 | SSW 6 | SW 6 | WSW 5 | SW 5 | WSW 7 | W 6 | W 6 | W 6 | W 5 | SW 5 | SW 7 |
| kJ | 171 | 155 | 167 | 318 | 143 | 120 | — | 28 | 2 | 7 | 77 | 137 | 78 | 106 | 189 | 154 | 141 | 197 | 97 | 51 | 312 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 255 | 319 | 5 | 257 | 496 | 128 | 5 | 255 | 128 | 187 | 138 | 231 | 5 | 337 | 123 | 497 | 463 | 128 | 297 | 255 | 98 |
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.
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