Surf Forecasts:
Harlech surf forecast from 13 Sep 2026:
- Best quality surf: Saturday 19 Sep, 10PM (local time) - 5ft (1.5m), 7s period, WSW swell with glassy winds.
- Most powerful swell: Saturday 19 Sep, 4PM (local time) - 5.5ft (1.7m), 7s period, WSW swell with 311 kJ wave energy.
- Next surfable swell (1★+): Saturday 19 Sep, 10PM (local time) - 5ft (1.5m), 7s period with WSW swell.
Best Forecast Surf Conditions for Harlech this week:
The surf forecast for Harlech over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 19) at 10PM. The primary swell is predicted to be 1.5m and 7s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Harlech in the next 16 days are 1.7m 7s and forecast to arrive on Saturday (Sep 19) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 5s period and expected on Wednesday (Sep 16) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sat 19th Sep) | 5ft (1.5m) 7s |
| Best Surf | 10PM (Sat 19th Sep) | 5ft (1.5m) 7s |
| Most Powerful | 4PM (Sat 19th Sep) | 5.5ft (1.7m) 7s |
Table - best surf conditions forecast for Harlech over the next 16 days.
Short Range ForecastLight rain (total 7mm), mostly falling on Mon night. Very mild (max 18°C on Sun afternoon, min 13°C on Tue night). Winds decreasing (fresh winds from the SW on Mon night, light winds from the WSW by Tue afternoon). | Days 5-7 Weather SummaryModerate rain (total 19mm), heaviest on Fri night. Very mild (max 16°C on Fri night, min 13°C on Thu night). Mainly fresh winds. | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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) | WSW 6 | SW 4 | SW 5 | SW 5 | SW 6 | W 5 | W 5 | NW 5 | NW 5 | W 5 | WSW 5 | W 6 | W 5 | W 6 | W 6 | WSW 5 | SW 6 | WSW 7 | WSW 7 | WSW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 16 | 12 | 16 | 43 | 131 | 64 | 54 | 35 | 64 | 22 | 37 | 109 | 78 | 127 | 108 | 36 | 80 | 244 | 311 | 93 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | cross-on | cross-on | on | on | cross-on | cross-on | on | cross-on | on | on | cross-on | on | cross-on | cross-on | cross-on | on | cross-on |
High Tide | 10:20PM4.70m | 10:39AM4.35m | 10:57PM4.45m | 11:14AM4.15m | 11:33PM4.10m | 11:49AM3.87m | 00:09AM3.70m | 12:25PM3.54m | 00:47AM3.29m | 1:05PM3.19m | 1:34AM2.90m | 2:01PM2.86m | 2:53AM2.60m | |||||||
Low Tide | 4:59PM0.23m | 5:23AM0.25m | 5:28PM0.40m | 5:49AM0.54m | 5:55PM0.63m | 6:13AM0.85m | 6:23PM0.90m | 6:36AM1.16m | 6:56PM1.20m | 7:10AM1.45m | 7:50PM1.49m | 8:13AM1.69m | 9:19PM1.69m | |||||||
 |  | |  |  | | | | | | | |  | | | |  |  | | | |
 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — |
 | 7:37 | — | — | 7:35 | — | — | 7:32 | — | — | 7:30 | — | — | 7:28 | — | — | 7:25 | — | — | 7:22 | — |
mm | — | — | — | — | 6 | — | — | 1 | — | — | 4 | — | 2 | 1 | — | — | 7 | 5 | 4 | — |
Temp °C | 18 | 17 | 17 | 17 | 18 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 16 | 16 | 16 | 15 |
Feels °C | 19 | 17 | 17 | 15 | 15 | 9 | 11 | 11 | 9 | 10 | 9 | 9 | 9 | 9 | 10 | 11 | 14 | 14 | 14 | 15 |
Swell 1 Height (m) Direction Period (s) | WSW 6 | W 9 | SW 5 | W 8 | — | — | — | WSW 5 | WSW 6 | W 9 | — | — | — | — | — | NW 5 | — | — | — | WSW 7 |
| kJ | 16 | 2 | 16 | 1 | — | — | — | 19 | 3 | 2 | — | — | — | — | — | 7 | — | — | — | 93 |
Swell 2 Height (m) Direction Period (s) | W 9 | — | W 9 | — | — | — | — | — | WSW 8 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 2 | — | 2 | — | — | — | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SW 4 | — | SW 5 | SW 6 | W 5 | W 5 | NW 5 | NW 5 | W 5 | WSW 5 | W 6 | W 5 | W 6 | W 6 | WSW 5 | SW 6 | WSW 7 | WSW 7 | NNW 3 |
| kJ | — | 12 | — | 43 | 131 | 64 | 54 | 35 | 64 | 22 | 37 | 109 | 78 | 127 | 108 | 36 | 80 | 244 | 311 | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 263 | 255 | 263 | 263 | 263 | 501 | 462 | 143 | 137 | 281 | 284 | 293 | 293 | 501 | 399 | 310 | 284 | 294 | 26 | 27 |
Best forecast wave conditions in Mid Wales | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
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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 Harlech 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 Harlech Surf forecast
The above surf forecast table for Harlech provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Harlech can be found by selecting the local surf guide option on the grey menu. Our Harlech 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 (Harlech) 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 Harlech 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.
Harlech is 9 km (6 miles) from Porthmadog. If you plan a holiday in Mid Wales, look for hotels and other accommodation in Porthmadog. Porthmadog has rooms for a wide range of budgets as well as car hire and transport links.
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