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Porth Colmon surfForecast / Wales – Lleyn / UK
12 Day Weather and Surf, issued 6 am Saturday 30 Aug 2025 BST
Best Forecast Surf Conditions for Porth Colmon this week:
The surf forecast for Porth Colmon over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 02) at 7AM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.3m and 4s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Porth Colmon in the next 12 days are 3.5m 9s and forecast to arrive on Sunday (Aug 31) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 5s period and expected on Saturday (Aug 30) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Tue 2nd Sep) | 3.5ft (1.1m) 7s |
| Best Surf | 7AM (Tue 2nd Sep) | 3.5ft (1.1m) 7s |
| Most Powerful | 4PM (Sun 31st Aug) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Porth Colmon over the next 12 days.
Short Range Forecast Heavy rain (total 20mm), heaviest during Sun night. Very mild (max 18°C on Sat afternoon, min 15°C on Sat night). Winds decreasing (near gales from the S on Sat afternoon, light winds from the SSW by Mon night). | Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Tue morning. Very mild (max 16°C on Tue afternoon, min 13°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Saturday 30 | Sunday 31 | Monday 01 | Tuesday 02 | Wednesday 03 | Thursday 04 | Friday 05 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 8 | 7 | 8 | 8 | 9 | 8 | 8 | 6 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 14 | 6 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 174 | 529 | 789 | 1137 | 1582 | 919 | 418 | 352 | 297 | 94 | 116 | 158 | 111 | 79 | 58 | 92 | 112 | 121 | 179 | 4 | 284 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross | cross | cross- off | glass | glass | glass | cross- off | cross- off | glass | on | on | cross- off | cross- off | cross- off |
High Tide / height (m) | 1:07PM 3.08 | 1:30AM 2.98 | 1:52PM 2.82 | 2:23AM 2.68 | 3:02PM 2.60 | 3:58AM 2.51 | 4:58PM 2.59 | 5:47AM 2.59 | 6:21PM 2.83 | 6:49AM 2.84 | 7:09PM 3.18 | 7:31AM 3.15 | 7:47PM 3.56 | ||||||||
Low Tide / height (m) | 7:43PM 1.19 | 8:10AM 1.35 | 8:39PM 1.43 | 9:16AM 1.56 | 10:09PM 1.59 | 10:59AM 1.61 | 11:59PM 1.52 | 12:32PM 1.42 | 1:13AM 1.24 | 1:30PM 1.13 | 2:02AM 0.89 | 2:14PM 0.81 | 2:43AM 0.53 | ||||||||
Saturday 30 | Sunday 31 | Monday 01 | Tuesday 02 | Wednesday 03 | Thursday 04 | Friday 05 | |||||||||||||||
| Sunrise | 6:24 | - | - | 6:26 | - | - | 6:26 | - | - | 6:28 | - | - | 6:31 | - | - | 6:31 | - | - | 6:33 | - | - |
| Sunset | - | 8:13 | - | - | 8:09 | - | - | 8:07 | - | - | 8:06 | - | - | 8:04 | - | - | 8:00 | - | - | 7:59 | - |
 |  |  |  |  |  | | |  | | |  | |  | | | | |  | |  | |
Rain (mm) | 1 | 3 | - | - | 1 | 10 | 1 | 1 | 3 | 2 | - | - | - | - | - | - | - | - | - | - | 14 |
| Temp. °C | 17 | 18 | 16 | 16 | 16 | 16 | 15 | 16 | 15 | 14 | 16 | 16 | 15 | 16 | 15 | 15 | 16 | 16 | 16 | 17 | 17 |
| Feels °C (?) | 10 | 10 | 7 | 6 | 6 | 7 | 10 | 9 | 9 | 12 | 16 | 14 | 15 | 13 | 12 | 15 | 12 | 11 | 10 | 9 | 9 |
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Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Wales - Lleyn
The wind is still cross-off at Porth Colmon (moderate winds from the S at Caernarfon Airport 33 km from Porth Colmon). 0.8m 7s swell from the SSW with a 0.3m 4s local chop from the NW. 2 swells combining to make bigger set waves.
33 km away, 1 h 17 min ago
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Porth Colmon surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Porth Colmon Surf forecast
The above surf forecast table for Porth Colmon provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Porth Colmon can be found by selecting the local surf guide option on the grey menu. Our Porth Colmon 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 (Porth Colmon) 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 Porth Colmon 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 Porth Colmon, camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 37 km (23 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 42 km (26 miles) away, Holyhead, Bangor and Aberystwyth.
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