Prefailles Surf Forecast

/ Loire Atlantique (9 surf breaks) /

France (410 surf breaks)

Surf Forecasts:

Prefailles surfForecast / Loire Atlantique / France

12 Day Weather and Surf, issued 7 pm Wednesday 17 Sep 2025 CEST

Forecast update in hr min s Forecast update imminent

Prefailles surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.

Today's Prefailles sea temperature is 18.5° C
(Which is normal for this time of year)

Best Forecast Surf Conditions for Prefailles this week:

The surf forecast for Prefailles over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 18) at 5AM. The primary swell is predicted to be 1.0m and 13s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Prefailles in the next 12 days are 1.0m 13s and forecast to arrive on Thursday (Sep 18) at 8AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 3s period and expected on Tuesday (Sep 23) at 11PM.

Wave Type	Time (CEST) & Date	Wave Height & Period
Next good surf (1 star+)	5AM (Thu 18th Sep)	3.5ft (1.0m) 13s
Best Surf	5AM (Thu 18th Sep)	3.5ft (1.0m) 13s
Most Powerful	8AM (Thu 18th Sep)	3.5ft (1.0m) 13s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Some drizzle, heaviest during Sat morning. Warm (max 23°C on Thu night, min 16°C on Wed night). Wind will be generally light.										Days 3-6 Weather Summary Moderate rain (total 15mm), heaviest on Mon afternoon. Very mild (max 19°C on Sat night, min 12°C on Tue morning). Winds decreasing (fresh winds from the SW on Sat night, calm by Sun night).
		Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23			Wed 24
	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	1	1	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	W	W	WSW	W	W	W	W	W	WSW	WSW	WSW	W	W	W	W	W	W	W	W	W	W
Period(s) (?)	12	13	12	11	10	10	10	10	9	9	9	8	8	8	8	7	6	7	15	13	12
Wave Graph (?)
kJ (?)	180	324	236	151	104	73	70	65	121	222	197	273	89	44	31	17	3	1	4	3	11
Wind (km/h)	W	SE	WSW	ENE	SE	S	WSW	SSE	SSW	W	WSW	WSW	NW	SSW	WSW	NNE	NE	N	NNE	NNE	NNE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross	cross- on	cross	cross- off	cross- on	on	cross- on	on	cross- on	cross	cross- on	cross	glass	cross- on	cross- on	off	cross- off	off	cross- off	off	off
High Tide / height (m)	3:36AM 3.56		3:49PM 3.91	4:17AM 3.81		4:28PM 4.16	4:49AM 4.02		4:58PM 4.34		5:16AM 4.18	5:25PM 4.46		5:39AM 4.29	5:49PM 4.51		6:02AM 4.36	6:14PM 4.49		6:26AM 4.37	6:39PM 4.40
Low Tide / height (m)	8:43PM 0.97	9:06AM 0.98		9:41PM 0.67	9:58AM 0.66		10:27PM 0.38	10:41AM 0.39		11:06PM 0.17	11:20AM 0.19		11:42PM 0.04	11:56AM 0.08		12:16AM 0.02	12:30PM 0.08		12:49AM 0.10	1:04PM 0.17

		Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23			Wed 24
Sunrise	-	7:48	-	-	7:50	-	-	7:52	-	-	7:52	-	-	7:54	-	-	7:56	-	-	7:56	-
Sunset	-	-	8:15	-	-	8:13	-	-	8:10	-	-	8:08	-	-	8:07	-	-	8:05	-	-	8:02

Rain (mm)	-	-	-	-	-	-	-	1	-	-	-	-	1	5	6	2	-	1	-	-	-
Temp. °C	16	16	19	23	21	22	21	19	20	19	17	17	16	14	15	16	13	17	17	13	18
Feels °C (?)	15	17	18	21	17	18	23	18	17	17	13	13	13	13	11	13	10	13	12	8	14

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 Loire Atlantique

Wind Update The wind is still cross-on at Prefailles (light winds from the SW.(Wind varies from 190 to 260 degs) at Saint -Nazaire -Montoir 21 km from Prefailles). 0.8m 10s swell from the W with a 0.2m 2s local chop from the WSW. 2 swells combining to make bigger set waves.
1 hour 35 minutes ago Prefailles

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21 km away, 1 h 35 min ago

13 km/h

0.0

18.5

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 Prefailles 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 Prefailles Surf forecast

The above surf forecast table for Prefailles provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Prefailles can be found by selecting the local surf guide option on the grey menu. Our Prefailles 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 (Prefailles) 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 Prefailles 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.

Prefailles is 17 km (11 miles) from Saint-Nazaire. If you plan a holiday in Loire Atlantique, look for hotels and other accommodation in Saint-Nazaire. Saint-Nazaire has rooms for a wide range of budgets as well as car hire and transport links.