Surf Forecasts:
Harlech surf forecast from 11 Sep 2026:
- Most powerful swell: Saturday 12 Sep, 4PM (local time) - 5.5ft (1.7m), 7s period, SW swell with 261 kJ wave energy.
Best Forecast Surf Conditions for Harlech this week:
The most powerful waves expected at Harlech in the next 16 days are 1.7m 7s and forecast to arrive on Saturday (Sep 12) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 4s period and expected on Friday (Sep 18) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 12th Sep) | 5.5ft (1.7m) 7s |
Table - best surf conditions forecast for Harlech over the next 16 days.
Short Range ForecastModerate rain (total 14mm), heaviest on Sat morning. Very mild (max 17°C on Sat afternoon, min 12°C on Fri night). Winds increasing (light winds from the SW on Fri afternoon, fresh winds from the SSW by Sat morning). | Days 4-6 Weather SummaryHeavy rain (total 21mm), heaviest during Mon night. Very mild (max 18°C on Mon morning, min 12°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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) | WSW 8 | WSW 8 | SW 8 | SW 6 | SW 7 | WSW 7 | WSW 7 | WSW 7 | SW 6 | SW 5 | SW 6 | SW 6 | WSW 6 | W 4 | NW 5 | NW 5 | WNW 4 | W 3 | WSW 5 | WSW 5 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 44 | 28 | 17 | 147 | 261 | 116 | 30 | 17 | 11 | 35 | 77 | 82 | 47 | 19 | 51 | 42 | 18 | 3 | 38 | 32 | 16 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross | on | on | cross-on | cross-on | on | on | cross-on | on | on |
High Tide | 9:04PM4.80m | 9:25AM4.43m | 9:43PM4.83m | 10:03AM4.45m | 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 | ||||||||
Low Tide | 3:52PM0.16m | 4:19AM-0.09m | 4:27PM0.14m | 4:53AM0.03m | 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 | ||||||||
 |  |  |  |  |  |  | | | | |  | | | | | |  |  | |  | |
 | 6:41 | — | — | 6:43 | — | — | 6:46 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — |
 | — | 7:42 | — | — | 7:39 | — | — | 7:37 | — | — | 7:35 | — | — | 7:32 | — | — | 7:30 | — | — | 7:28 | — |
mm | — | — | — | 8 | 4 | 1 | 1 | — | — | 3 | 1 | 6 | — | 1 | 2 | 2 | — | 6 | — | — | — |
Temp °C | 14 | 15 | 14 | 16 | 17 | 17 | 16 | 16 | 17 | 18 | 18 | 17 | 15 | 16 | 14 | 14 | 14 | 15 | 14 | 15 | 14 |
Feels °C | 12 | 14 | 10 | 12 | 14 | 16 | 15 | 16 | 17 | 18 | 16 | 15 | 11 | 13 | 11 | 10 | 11 | 11 | 8 | 12 | 10 |
Swell 1 Height (m) Direction Period (s) | WSW 8 | WSW 8 | SW 8 | — | — | — | WSW 7 | WSW 7 | SW 6 | — | — | WSW 6 | — | — | WSW 6 | SW 6 | WSW 6 | — | — | — | SW 6 |
| kJ | 44 | 28 | 17 | — | — | — | 30 | 17 | 11 | — | — | 41 | — | — | 15 | 10 | 3 | — | — | — | 16 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 4 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 4 | NW 4 | SW 3 | SW 6 | SW 7 | WSW 7 | — | — | SW 3 | SW 5 | SW 6 | SW 6 | WSW 6 | W 4 | NW 5 | NW 5 | WNW 4 | W 3 | WSW 5 | WSW 5 | — |
| kJ | 5 | 4 | 1 | 147 | 261 | 116 | — | — | 2 | 35 | 77 | 82 | 47 | 19 | 51 | 42 | 18 | 3 | 38 | 32 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 137 | 137 | 245 | 263 | 344 | 142 | 137 | 292 | 263 | 263 | 263 | 257 | 1048 | 1215 | 143 | 143 | 284 | 288 | 293 | 501 | 399 |
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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