Surf Forecasts:
Hells Mouth (Porth Neigwl) surf forecast from 15 Oct 2026:
- Best quality surf: Friday 16 Oct, 1AM (local time) - 2.5ft (0.8m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 22 Oct, 4AM (local time) - 5ft (1.6m), 6s period, NW swell with 163 kJ wave energy.
- Next surfable swell (1★+): Friday 16 Oct, 1AM (local time) - 2.5ft (0.8m), 8s period with SW swell.
Best Forecast Surf Conditions for Hells Mouth (Porth Neigwl) this week:
The surf forecast for Hells Mouth (Porth Neigwl) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Oct 16) at 1AM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.4m and 13s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Hells Mouth (Porth Neigwl) in the next 16 days are 1.6m 6s and forecast to arrive on Thursday (Oct 22) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Friday (Oct 16) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Fri 16th Oct) | 2.5ft (0.8m) 8s |
| Best Surf | 1AM (Fri 16th Oct) | 2.5ft (0.8m) 8s |
| Most Powerful | 4AM (Thu 22nd Oct) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Hells Mouth (Porth Neigwl) over the next 16 days.
Short Range ForecastLight rain (total 7mm), mostly falling on Thu afternoon. Very mild (max 13°C on Thu afternoon, min 9°C on Sat night). Winds decreasing (fresh winds from the NW on Fri morning, light winds from the E by Sat night). | Days 5-7 Weather SummaryModerate rain (total 10mm), heaviest on Tue afternoon. Very mild (max 14°C on Mon afternoon, min 10°C on Sun afternoon). Mainly fresh winds. | |||||||||||||||||||
Thu 15 | Friday 16 | Saturday 17 | Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | ||||||||||||||
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 8 | SW 8 | WSW 12 | NW 5 | SW 7 | WSW 11 | WSW 7 | SW 11 | SW 10 | W 9 | W 7 | W 17 | W 16 | SW 11 | SE 3 | W 10 | SW 8 | W 7 | WNW 4 | NW 5 |
Wave Graph  | ||||||||||||||||||||
 kJ | 329 | 78 | 58 | 63 | 14 | 12 | 5 | 4 | 4 | 2 | 1 | 6 | 5 | 5 | 7 | 2 | 2 | 1 | 12 | 76 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross-off | cross-off | off | off | cross-off | off | cross-off | off | off | cross-off | cross-off | cross-off | off | cross-off | cross | cross-on | cross |
High Tide | 11:47PM3.62m | 12:02PM3.62m | 00:24AM3.26m | 12:42PM3.29m | 1:08AM2.92m | 1:33PM3.00m | 2:12AM2.64m | 2:56PM2.82m | 4:05AM2.57m | 4:46PM2.91m | 5:35AM2.79m | 5:50PM3.20m | ||||||||
Low Tide | 6:12PM0.90m | 6:17AM1.16m | 6:53PM1.16m | 6:59AM1.41m | 7:52PM1.41m | 8:06AM1.61m | 9:10PM1.57m | 9:31AM1.70m | 10:36PM1.55m | 10:56AM1.63m | 11:51PM1.36m | 12:06PM1.42m | 00:48AM1.08m | |||||||
 |  |  | |  | | | | | | | |  |  | | | |  | | | |
 | — | — | 7:43 | — | — | 7:46 | — | — | 7:48 | — | — | 7:50 | — | — | 7:52 | — | — | 7:54 | — | — |
 | 6:23 | — | — | 6:22 | — | — | 6:19 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | 6:10 | — |
mm | 5 | 2 | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 5 | 3 | — | — | 4 |
Temp °C | 13 | 13 | 11 | 13 | 12 | 11 | 11 | 10 | 10 | 11 | 10 | 11 | 14 | 13 | 12 | 12 | 13 | 13 | 14 | 11 |
Feels °C | 11 | 10 | 4 | 6 | 5 | 8 | 8 | 7 | 7 | 6 | 5 | 5 | 10 | 11 | 10 | 10 | 11 | 10 | 11 | 3 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | NNW 5 | NW 4 | NNW 4 | SW 10 | SW 7 | W 7 | W 7 | W 16 | SW 11 | SW 11 | W 8 | SW 8 | W 7 | W 7 | W 13 |
| kJ | 329 | 78 | 29 | 27 | 12 | 17 | 5 | 1 | 4 | 2 | 1 | 1 | 5 | 5 | 4 | 1 | 2 | 1 | 1 | 4 |
Swell 2 Height (m) Direction Period (s) | WSW 14 | WSW 13 | WSW 12 | WSW 12 | WSW 12 | WSW 7 | WSW 7 | SW 7 | W 10 | W 9 | — | W 17 | W 12 | — | W 13 | W 10 | SW 6 | — | — | S 6 |
| kJ | 37 | 64 | 58 | 28 | 14 | 5 | 5 | 2 | 2 | 2 | — | 6 | 3 | — | 3 | 2 | 2 | — | — | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | WSW 11 | SW 11 | SW 11 | — | — | — | — | W 8 | N 5 | — | — | — | S 7 | S 7 | — |
| kJ | — | — | — | — | — | 12 | 5 | 4 | — | — | — | — | 1 | 1 | — | — | — | 1 | 1 | — |
Wind waves Height (m) Direction Period (s) | — | NNW 3 | NW 4 | NW 5 | NNW 5 | — | — | — | — | — | — | NE 2 | NE 3 | E 3 | SE 3 | SSE 3 | — | — | WNW 4 | NW 5 |
| kJ | — | 2 | 29 | 63 | 66 | — | — | — | — | — | — | 2 | 2 | 8 | 7 | 1 | — | — | 12 | 76 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 98 | 5 | 36 | 123 | 145 | 128 | 128 | 128 | 114 | 128 | 294 | 294 | 114 | 292 | 138 | 198 | 192 | 228 | 231 | 309 |
Best forecast wave conditions in Lleyn Peninsula | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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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