Harlech Surf Forecast

/ Wales – Mid (13 surf breaks) /

UK (471 surf breaks)

Surf Forecasts:

Harlech surfForecast / Wales – Mid / UK

12 Day Weather and Surf, issued 12 am Thursday 04 Sep 2025 BST

Forecast 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 18.3° C
(Which is 2.6°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 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 04) at 4AM. The primary swell is predicted to be 0.9m and 10s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Harlech in the next 12 days are 2.2m 13s and forecast to arrive on Monday (Sep 08) at 7PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Monday (Sep 08) at 10AM.

Wave Type	Time (BST) & Date	Wave Height & Period
Next good surf (1 star+)	4AM (Thu 4th Sep)	3ft (0.9m) 10s
Best Surf	4AM (Thu 4th Sep)	3ft (0.9m) 10s
Most Powerful	7PM (Mon 8th Sep)	7ft (2.2m) 13s

Table - best surf conditions forecast for Harlech over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Light rain (total 7mm), mostly falling on Wed night. Warm (max 21°C on Sat afternoon, min 13°C on Wed night). Wind will be generally light.										Days 3-6 Weather Summary Heavy rain (total 21mm), heaviest during Sun afternoon. Warm (max 20°C on Sat night, min 13°C on Sun night). Mainly fresh winds.
		Thursday 04			Friday 05			Saturday 06			Sunday 07			Monday 08			Tuesday 09			Wed 10
	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM
Rating (10 max)	0	1	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	WSW	SW	WSW	WSW	WSW	WSW	SW	SW	SW	SW	SW	WSW	SW	SW	SW	SW	SW	SW	WSW	SW	SW
Period(s) (?)	9	10	10	10	9	9	8	5	5	6	8	10	10	9	13	12	10	10	9	8	8
Wave Graph (?)
Energy (?)	98	95	135	81	46	31	16	9	14	6	20	141	303	144	1859	1702	833	348	119	93	100
Wind (km/h)	W	NNW	W	WNW	WSW	SW	SE	ESE	SSE	SE	SSE	S	S	SSE	S	SSE	SSE	S	SE	SSE	SSW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	glass	on	cross- on	on	cross- on	cross- off	cross- off	cross- off	cross- off	cross- off	cross	cross	cross- off	cross	cross- off	cross- off	cross- off	cross- off	cross- off	cross
High Tide / height (m)		6:31AM 3.02	6:53PM 3.38		7:14AM 3.37		7:32PM 3.81	7:52AM 3.74		8:09PM 4.23	8:30AM 4.08		8:46PM 4.60	9:07AM 4.36		9:23PM 4.87	9:45AM 4.55		10:02PM 4.99	10:24AM 4.61
Low Tide / height (m)	1:09AM 1.35		1:27PM 1.23	2:00AM 0.98		2:12PM 0.89	2:41AM 0.60		2:51PM 0.59	3:19AM 0.27		3:27PM 0.34	3:56AM 0.03		4:03PM 0.19		4:32AM -0.08	4:39PM 0.13		5:09AM -0.04	5:16PM 0.18

		Thursday 04			Friday 05			Saturday 06			Sunday 07			Monday 08			Tuesday 09			Wed 10
Sunrise	-	6:30	-	-	6:31	-	-	6:33	-	-	6:35	-	-	6:37	-	-	6:39	-	-	6:39	-
Sunset	-	-	7:59	-	-	7:57	-	-	7:53	-	-	7:52	-	-	7:50	-	-	7:46	-	-	7:45

Rain (mm)	4	2	1	-	-	-	-	-	-	1	3	6	1	-	2	2	2	4	4	4	2
Temp. °C	15	15	16	15	15	15	14	19	21	20	18	17	16	18	18	16	16	17	16	15	16
Feels °C (?)	13	12	14	14	12	13	12	16	18	15	14	15	14	12	13	10	12	13	12	12	13

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Wales - Mid

Wind Update Continuing clean conditions at Harlech (calm at Caernarfon 26 km from Harlech). A 0.9m swell from the WSW
50 minutes ago Harlech

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26 km away, 50 min ago

5 km/h

0.0

18.3

Air / Water (°C)

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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 12 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.