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Surf Forecasts:
Harlech surfForecast / Wales – Mid / UK
16 Day Weather and Surf, issued 12 pm Sunday 17 May 2026 BSTForecast update in hr min s Forecast update imminent
Harlech surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Harlech sea temperature is
12.3° C
(Which is 1.5°C warmer than normal for this time of year)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 Friday (May 22) at 1AM. The primary swell is predicted to be 0.6m and 10s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Harlech in the next 16 days are 2.0m 9s and forecast to arrive on Wednesday (May 20) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Tuesday (May 19) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Fri 22nd May) | 2ft (0.6m) 10s |
| Best Surf | 1AM (Fri 22nd May) | 2ft (0.6m) 10s |
| Most Powerful | 4AM (Wed 20th May) | 6.5ft (2.0m) 9s |
Table - best surf conditions forecast for Harlech over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 32mm), heaviest during Tue night. Very mild (max 12°C on Tue morning, min 8°C on Sun night). Winds increasing (light winds from the SW on Sun night, fresh winds from the SW by Tue afternoon). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Wed night. Very mild (max 18°C on Fri morning, min 12°C on Wed morning). Winds decreasing (fresh winds from the SW on Wed morning, calm by Fri night). | ||||||||||||||||||||
Sunday 17 | Monday 18 | Tuesday 19 | Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
W 5 | WSW 4 | WSW 5 | WSW 6 | WSW 6 | SW 4 | SSW 7 | SW 7 | SW 8 | SW 9 | SW 7 | SW 7 | SW 7 | SW 7 | SW 10 | SW 10 | WSW 11 | WSW 10 | WSW 10 | SW 10 | WSW 9 | |
28 | 34 | 37 | 33 | 16 | 10 | 81 | 322 | 515 | 406 | 230 | 91 | 82 | 62 | 74 | 79 | 81 | 40 | 38 | 23 | 16 | |
Wind (km/h) | |||||||||||||||||||||
on | cross-on | cross-on | cross-on | cross | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-off | cross | cross | off | cross | cross-on | glassy | glassy | cross-on | off | |
High Tide | 9:19PM4.68m | 9:43AM4.65m | 10:04PM4.70m | 10:30AM4.48m | 10:50PM4.58m | 11:18AM4.19m | 11:39PM4.36m | 12:10PM3.82m | 00:33AM4.08m | 1:07PM3.44m | 1:33AM3.78m | 2:15PM3.15m | 2:44AM3.56m | ||||||||
Low Tide | 4:02PM0.26m | 4:27AM0.20m | 4:50PM0.36m | 5:19AM0.23m | 5:40PM0.52m | 6:13AM0.33m | 6:32PM0.71m | 7:11AM0.49m | 7:28PM0.91m | 8:12AM0.66m | 8:27PM1.08m | 9:16AM0.80m | 9:31PM1.20m | ||||||||
 |  |  | |  |  | | | | |  | | | |  | | | | |  |  | |
 | 5:16 | — | — | 5:15 | — | — | 5:13 | — | — | 5:11 | — | — | 5:09 | — | — | 5:09 | — | — | 5:07 | — | — |
 | — | — | 9:08 | — | — | 9:10 | — | — | 9:13 | — | — | 9:14 | — | — | 9:15 | — | — | 9:16 | — | — | 9:17 |
1 | 2 | 5 | 1 | — | 7 | 2 | 1 | 13 | 1 | — | 3 | — | — | — | — | — | — | — | — | — | |
Temp °C | 11 | 10 | 9 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 13 | 13 | 15 | 17 | 17 | 18 | 16 | 14 | 20 | 21 | 19 |
6 | 5 | 6 | 8 | 8 | 8 | 8 | 5 | 6 | 6 | 9 | 10 | 13 | 16 | 15 | 16 | 16 | 13 | 20 | 21 | 18 | |
Swell 1 Height (m) Direction Period (s) | W 13 | NW 4 | W 12 | WSW 6 | WSW 6 | SW 4 | WSW 7 | — | — | — | — | SW 7 | — | SW 7 | SW 10 | SW 10 | WSW 11 | WSW 10 | WSW 10 | SW 10 | WSW 9 |
 kJ | 3 | 1 | 3 | 33 | 16 | 10 | 20 | — | — | — | — | 91 | — | 62 | 74 | 79 | 81 | 40 | 38 | 23 | 16 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | WSW 11 | — | W 15 | — | WSW 13 | — | — | — | W 13 | W 13 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 13 | — | 4 | — | 16 | — | — | — | 4 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 5 | WSW 4 | WSW 5 | — | — | SE 2 | SSW 7 | SW 7 | SW 8 | SW 9 | SW 7 | S 3 | SW 7 | — | SE 2 | — | — | — | — | — | — |
| kJ | 28 | 34 | 37 | — | — | 2 | 81 | 322 | 515 | 406 | 230 | 3 | 82 | — | 1 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 284 | 284 | 284 | 26 | 257 | 329 | 308 | 351 | 305 | 310 | 310 | 207 | 151 | 61 | 0 | 140 | 26 | 80 | 26 | 26 | 130 |
Best forecast wave conditions in Mid Wales | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
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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