Weather Grève de Saint Marc - Detailed bulletin - Free 15-day Marine forecasts

Tréveneuc (22411)Longitude : -2°51’,1836 W Latitude : 48°40’,014 N Altitude : 0m

Sat

13

-

- nd - km/h - bft - m/s - mph

Sun

14

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- nd - km/h - bft - m/s - mph

Mon

15

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- nd - km/h - bft - m/s - mph

Tue

16

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- nd - km/h - bft - m/s - mph

Wed

17

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- nd - km/h - bft - m/s - mph

Thu

18

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- nd - km/h - bft - m/s - mph

Fri

19

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- nd - km/h - bft - m/s - mph

Sat

20

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- nd - km/h - bft - m/s - mph

Sun

21

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- nd - km/h - bft - m/s - mph

Mon

22

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- nd - km/h - bft - m/s - mph

Tue

23

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- nd - km/h - bft - m/s - mph

Wed

24

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- nd - km/h - bft - m/s - mph

Thu

25

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- nd - km/h - bft - m/s - mph

Fri

26

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- nd - km/h - bft - m/s - mph

Sat

27

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- nd - km/h - bft - m/s - mph

BULLETIN

(established in local time)

Reliability 85%

Wind alert - Warning strong breeze offshore.

Saturday 13 september

Wind

Average winds

Gusts

10m above ground level:

Direction

Speed

Gusts

Under storms

Waves

Total sea (m) (m)

Swell height (m) (m)

Total sea (m)

Total wave height (m)

Wind (m)

Swell direction

Swell height (m)

Swell period (s)

Wave length (m)

High tide (m)

Sea temp

Weather

Rain (mm) (mm)

Cloud cover(%)

Amount of precipitation(mm)

Type of precipitation

Precipitation risk(%)

Visibility(km)

Pressure(hPa)

UV

Temperature

Air temp

Perceived temp

Air temp

Perceived temp

Offshore

Offshore wind

Offshore sea (m)

30

20

10

0

50

40

30

20

10

15

10

5

0

40

30

20

10

0

10

5

0

1

0.5

0

3

0

20

15

10

70

65

60

55

50

Sun 14

09h
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
20h
21h
22h
23h
00h
01h
02h
03h
04h
05h
06h
07h
08h

230° SW SW
235° SW SW
240° SW WSW
245° SW WSW
245° SW WSW
240° SW WSW
240° SW WSW
250° W WSW
255° W WSW
265° W W
255° W WSW
250° W WSW
240° SW WSW
230° SW SW
225° SW SW
220° SW SW
210° SW SSW
210° SW SSW
190° S S
180° S S
170° S S
155° SE SSE
155° SE SSE
150° SE SSE

11 21 6 13 4
13 24 7 15 4
15 27 8 17 4
15 27 8 17 4
15 27 8 17 4
15 27 8 17 4
14 26 7 16 4
14 26 7 16 4
13 24 7 15 4
12 23 6 14 4
11 20 6 12 4
9 17 5 11 3
8 15 4 9 3
8 15 4 9 3
8 14 4 9 3
8 14 4 9 3
7 13 4 8 3
5 10 3 6 2
6 11 3 7 2
6 11 3 7 2
6 12 3 7 3
8 14 4 9 3
8 15 4 9 3
9 16 4 10 3

20 37 10 23 5
22 41 11 25 6
24 44 12 27 6
25 46 13 29 6
25 47 13 29 6
25 47 13 29 6
26 48 13 30 6
26 48 13 30 6
25 46 13 29 6
24 44 12 27 6
22 41 11 25 6
18 34 9 21 5
17 31 9 19 5
13 25 7 16 4
11 21 6 13 4
11 21 6 13 4
11 20 6 12 4
10 19 5 12 3
10 18 5 11 3
10 18 5 11 3
10 19 5 12 -
12 23 6 14 4
12 23 6 14 4
13 25 7 16 4

- - - - -
- - - - -
- - - - -
- - - - -
>40 >75 >21 >45 >9
>40 >75 >22 >45 >9
>45 >85 >24 >50 >9
- - - - -
>40 >80 >23 >50 >9
>45 >85 >24 >50 >9
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -

0.4
0.4
0.4
0.4
0.5
0.5
0.4
0.4
0.4
0.5
0.5
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.3
0.3
0.3
0.3

0.8
0.8
0.9
0.9
1
1
0.9
0.9
0.9
1
0.9
0.9
0.9
0.8
0.9
0.9
0.9
0.8
0.8
0.8
0.7
0.7
0.7
0.7

0.2
0.2
0.2
0.2
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0
0
0
0
0.1
0.1
0

230° SW SW
270° W W
180° S S
225° SW SW
225° SW SW
180° S S
180° S S
185° S S
185° S S
185° S S
185° S S
185° S S
185° S S
180° S S
270° W W
225° SW SW
180° S S
180° S S
185° S S
185° S S
350° N N
350° N N
350° N N
350° N N

0.4
0.3
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.3
0.3
0.3
0.3

10
10
10
10
10
10
9
10
10
9
9
9
9
9
9
8
9
9
9
9
10
10
10
10

140
130
130
130
130
130
140
140
140
140
140
120
160
160
150
140
160
170
170
170
150
150
150
160

7.4
9.4
10.5
10.5
9.6
8.0
6.2
4.4
3.2
2.7
3.1
4.5
6.5
8.4
9.7
10.1
9.6
8.4
6.8
5.2
3.9
3.2
3.4
4.4

18 65
18 65
18 65
18 65
18 65
18 65
19 65
19 65
19 65
19 65
19 65
19 65
19 65
18 65
18 65
18 65
18 65
18 65
18 65
18 65
18 65
18 65
18 65
18 65

10
0
35
80
90
85
85
60
85
55
65
40
40
30
55
55
90
55
80
95
100
100
100
100

1.7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

-
-
-
-
-
-
-

90
0
0
20
40
45
40
35
40
40
30
25
20
0
0
0
0
0
20
25
25
20
25
30

>20
>20
>20
>20
>20
>20
>20
>20
>20
>20
>20
>20
>20
>20
>20
>20
10
10
10
5
10
15
>20
>20

1013
1013
1013
1013
1013
1013
1013
1012
1012
1013
1013
1013
1014
1014
1014
1014
1014
1014
1014
1013
1013
1012
1012
1012

0
1
2
2
2
2
2
3
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0

14 58
15 60
17 62
17 63
18 64
18 64
18 64
18 65
18 65
17 63
17 63
16 61
15 59
14 58
14 56
13 56
13 56
14 56
14 57
14 57
15 58
15 59
15 59
15 60

11 52
15 58
15 59
16 61
17 63
17 63
17 63
17 63
17 62
14 58
14 58
13 55
12 54
11 52
11 51
11 51
11 51
12 53
11 53
12 53
12 54
12 54
12 54
12 54

19 35 5 10 22
19 35 5 10 22
19 36 5 10 22
19 36 5 10 22
18 33 5 9 21
18 33 5 9 21
19 35 5 10 22
17 31 5 9 19
15 28 4 8 17
18 34 5 9 21
17 31 5 9 19
16 29 5 8 18
15 28 4 8 17
15 27 4 8 17
15 27 4 8 17
13 24 4 7 15
11 21 4 6 13
9 17 3 5 11
9 17 3 5 11
9 17 3 5 11
10 19 3 5 12
12 23 4 6 14
13 25 4 7 16
15 28 4 8 17

1
1.1
1.1
1.1
1.1
1.1
1
1
1
1
1
0.9
0.9
0.9
0.9
0.8
0.8
0.8
0.8
0.7
0.7
0.7
0.7
0.7

Forecasts established in local time
Last updated 2h ago | Next update in 1h
Caption

Expert opinion

A westerly, strong and mostly variable flow prevails over the whole area.

For Grève de Saint Marc :
Warning strong breeze offshore.

We are 85% sure of the situation, because the atmosphere might be less unstable and showers more frequent than forecast.

Cloud and sun in the morning, very cloudy with possibility of thunder storms in the afternoon. Some showers in the morning, possibility of showers in the afternoon. In the evening, very cloudy with risk of storms.
Possibility of showers SW wind force 4 continuing all day. Gusts reaching 26 knots in the middle of the day. Smooth to slight sea. Low, fairly long swell from S. Excellent visibility.

Tides at Saint-Quay-Portrieux

75

Low tide 05h45 2.26m

High tide 11h26 10.61m

66

Low tide 18h05 2.68m

High tide 23h49 10.1m

www.shom.fr - © SHOM 2025

Consult the tides for September

Sat

13

-

- nd - km/h - bft - m/s - mph

Sun

14

-

- nd - km/h - bft - m/s - mph

Mon

15

-

- nd - km/h - bft - m/s - mph

Tue

16

-

- nd - km/h - bft - m/s - mph

Wed

17

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- nd - km/h - bft - m/s - mph

Thu

18

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- nd - km/h - bft - m/s - mph

Fri

19

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- nd - km/h - bft - m/s - mph

Sat

20

-

- nd - km/h - bft - m/s - mph

Sun

21

-

- nd - km/h - bft - m/s - mph

Mon

22

-

- nd - km/h - bft - m/s - mph

Tue

23

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- nd - km/h - bft - m/s - mph

Wed

24

-

- nd - km/h - bft - m/s - mph

Thu

25

-

- nd - km/h - bft - m/s - mph

Fri

26

-

- nd - km/h - bft - m/s - mph

Sat

27

-

- nd - km/h - bft - m/s - mph

* +33 1 77 86 86 86: short number of forecasts for France accessible from France - €2.99 per call** 0899 70 12 34: number of forecasts for France and the World accessible from France - €2.99 per call

Weather beach Grève de Saint Marc

BULLETIN

Wind

Waves

Weather

Temperature

Offshore

Expert opinion

Tides at Saint-Quay-Portrieux