Surf Forecasts:
Hells Mouth (Porth Neigwl) surf forecast from 18 Sep 2026:
- Most powerful swell: Friday 18 Sep, 7PM (local time) - 8ft (2.5m), 7s period, SW swell with 671 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 2.5m 7s and forecast to arrive on Friday (Sep 18) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Wednesday (Sep 23) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Fri 18th Sep) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Hells Mouth (Porth Neigwl) over the next 16 days.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri afternoon. Very mild (max 17°C on Sat morning, min 12°C on Sun morning). Winds decreasing (near gales from the SW on Fri afternoon, calm by Sun afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Mon morning, min 13°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | |||||||||||||||
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 5 | SW 7 | SW 7 | WSW 7 | WSW 7 | W 4 | SW 6 | SW 6 | SW 6 | SW 4 | SW 4 | SW 4 | W 13 | W 12 | W 12 | W 15 | SW 4 | W 12 | SW 6 | SE 3 | S 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 60 | 635 | 598 | 372 | 164 | 59 | 39 | 18 | 5 | 17 | 11 | 9 | 3 | 3 | 3 | 4 | 7 | 3 | 2 | 2 | 9 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-on | cross-on | cross | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | on | glassy | on | glassy | off | cross | cross-on | cross-on |
High Tide | 1:15PM3.17m | 1:45AM2.89m | 2:13PM2.85m | 3:05AM2.60m | 4:04PM2.70m | 5:14AM2.61m | 5:48PM2.90m | 6:23AM2.86m | 6:40PM3.23m | 7:03AM3.17m | 7:16PM3.59m | 7:36AM3.50m | 7:48PM3.95m | ||||||||
Low Tide | 7:27AM1.41m | 8:05PM1.45m | 8:28AM1.66m | 9:31PM1.65m | 10:10AM1.77m | 11:24PM1.64m | 11:57AM1.65m | 00:48AM1.40m | 1:03PM1.37m | 1:38AM1.08m | 1:48PM1.06m | 2:17AM0.76m | 2:25PM0.77m | 2:52AM0.47m | |||||||
 |  |  |  |  |  | | | | | |  | | | | | | | | | | |
 | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:01 | — | — | 7:03 | — | — | 7:03 | — | — | 7:05 | — | — |
 | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — | — | 7:20 | — | — | 7:17 | — | — | 7:15 | — | — | 7:13 | — |
mm | — | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 16 | 17 | 17 | 16 | 13 | 13 | 15 | 17 | 17 | 17 | 16 | 17 | 17 | 17 | 17 | 15 | 18 | 22 | 20 |
Feels °C | 6 | 8 | 9 | 12 | 12 | 12 | 9 | 12 | 12 | 16 | 16 | 16 | 16 | 18 | 18 | 16 | 17 | 14 | 15 | 20 | 17 |
Swell 1 Height (m) Direction Period (s) | NW 5 | — | — | — | W 16 | — | SW 6 | NW 5 | SW 6 | SW 7 | W 13 | SW 4 | WSW 3 | — | SW 6 | SW 6 | SW 8 | SW 7 | NNW 5 | — | — |
| kJ | 14 | — | — | — | 5 | — | 39 | 11 | 5 | 2 | 3 | 9 | 1 | — | 2 | 1 | 3 | 2 | 5 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | W 14 | SW 6 | NW 4 | W 13 | W 7 | — | SW 5 | SW 5 | W 12 | W 11 | SW 13 | SW 4 | SW 6 | SW 6 | W 8 |
| kJ | — | — | — | — | — | — | 4 | 18 | 1 | 3 | 1 | — | 1 | 1 | 3 | 2 | 7 | 1 | 2 | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | W 14 | — | — | — | W 13 | W 13 | W 12 | — | W 15 | W 12 | W 12 | — | — | — |
| kJ | — | — | — | — | — | — | — | 4 | — | — | — | 3 | 3 | 3 | — | 4 | 3 | 3 | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 7 | SW 7 | WSW 7 | WSW 7 | W 4 | NW 5 | — | SW 3 | SW 4 | SW 4 | — | — | — | — | — | SW 4 | N 4 | ESE 3 | SE 3 | S 4 |
| kJ | 60 | 635 | 598 | 372 | 164 | 59 | 35 | — | 2 | 17 | 11 | — | — | — | — | — | 6 | 16 | 3 | 2 | 9 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 505 | 369 | 463 | 258 | 5 | 238 | 128 | 114 | 128 | 242 | 286 | 216 | 114 | 114 | 114 | 107 | 137 | 114 | 184 | 248 | 201 |
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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