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

Wed

13

-

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

Thu

14

-

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

Fri

15

-

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

Sat

16

-

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

Sun

17

-

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

Mon

18

-

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

Tue

19

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

Wed

20

-

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

Thu

21

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

Fri

22

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

Sat

23

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

Sun

24

-

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

Mon

25

-

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

Tue

26

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

Wed

27

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

BULLETIN

(established in local time)

Reliability 90%

No gale warning.

Wednesday 13 august

Wind

Average winds

Gusts

10m above ground level:

Direction

Speed

Gusts

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)

15

10

5

0

30

20

10

0

10

5

0

20

15

10

5

0

5

0

0.5

0

3

0

30

25

20

15

10

90

80

70

60

50

Thu 14

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

240° SW WSW
150° SE SSE
5° N N
10° N N
15° N NNE
10° N N
15° N NNE
20° N NNE
15° N NNE
355° N N
355° N N
350° N N
325° NW NW
295° NW WNW
265° W W
255° W WSW
250° W WSW
255° W WSW
245° SW WSW
245° SW WSW
245° SW WSW
255° W WSW
260° W W
280° W W

2 3 1 2 1
2 4 1 2 1
2 3 1 2 1
3 5 1 3 1
4 8 2 5 2
7 13 4 8 3
7 13 4 8 3
6 12 3 7 3
6 11 3 7 2
6 11 3 7 2
6 11 3 7 2
4 8 2 5 2
3 6 2 4 2
2 4 1 2 1
3 5 1 3 1
3 6 2 4 2
3 6 2 4 2
4 7 2 4 2
4 8 2 5 2
5 10 3 6 2
5 9 3 6 2
5 9 3 6 2
5 9 3 6 2
5 9 3 6 2

5 9 3 6 2
7 13 4 8 3
8 15 4 9 3
9 17 5 11 3
11 20 6 12 4
12 22 6 14 4
13 24 7 15 4
12 23 6 14 4
11 21 6 13 4
10 19 5 12 3
10 19 5 12 3
9 16 4 10 3
8 14 4 9 3
5 10 3 6 2
5 9 3 6 2
5 10 3 6 -
6 11 3 7 -
6 12 3 7 3
6 12 3 7 3
8 15 4 9 3
9 16 4 10 3
8 15 4 9 3
9 17 5 11 3
10 19 5 12 3

0.2
0.1
0.2
0.1
0.1
0.1
0.1
0.1
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
0.1
0.1
0.1

0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.3
0.3
0.3
0.3
0.3
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2

0
0
0
0
0
0
0
0.1
0.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

185° S S
200° S SSW
200° S SSW
245° SW WSW
245° SW WSW
230° SW SW
240° SW WSW
200° S SSW
200° S SSW
190° S S
190° S SSW
185° S S
185° S S
185° S S
200° S SSW
195° S SSW
200° S SSW
200° S SSW
345° N NNW
345° N NNW
340° N NNW
340° N NNW
340° N NNW
340° N NNW

0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1

8
7
7
7
7
8
8
8
5
6
6
7
7
7
6
6
6
6
7
7
7
6
6
6

130
130
130
120
120
120
110
90
70
80
80
90
90
90
100
100
100
100
80
80
70
70
60
60

11.2
10.2
8.4
6.2
4.0
2.4
1.8
2.3
4.1
6.6
9.1
10.9
11.4
10.7
9.1
6.9
4.7
2.9
1.8
1.9
3.2
5.5
8.0
10.0

21 69
21 69
21 70
21 70
21 70
21 71
22 71
22 71
22 71
22 71
21 71
21 71
21 71
21 70
21 70
21 71
21 71
21 71
21 71
21 70
21 70
21 70
21 70
21 70

100
100
100
100
90
95
85
40
50
40
75
85
65
80
75
45
35
50
55
55
80
60
80
70

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-

20
20
20
20
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

10
10
5
10
15
15
>20
15
>20
>20
>20
15
15
10
5
5
5
4
5
5
5
5
15
>20

1015
1015
1015
1016
1016
1016
1016
1016
1015
1015
1016
1016
1017
1017
1017
1018
1018
1017
1018
1018
1018
1019
1019
1019

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

19 67
20 68
20 68
21 70
21 70
21 70
21 70
21 69
21 69
20 69
20 67
19 66
19 65
18 65
18 64
17 63
17 62
16 61
16 60
16 60
16 61
16 62
18 64
19 67

19 66
19 67
25 76
25 77
27 81
26 78
25 76
24 76
23 74
23 73
18 64
17 63
17 63
17 63
16 61
16 60
15 60
15 59
14 57
14 57
14 57
15 59
17 63
19 67

3 5 1 1 3
2 3 1 1 2
3 5 1 1 3
3 6 2 2 4
6 12 3 3 7
8 15 3 4 9
8 15 3 4 9
7 13 3 4 8
6 12 3 3 7
6 11 2 3 7
6 12 3 3 7
5 9 2 3 6
4 8 2 2 5
4 7 2 2 4
4 7 2 2 4
4 7 2 2 4
5 10 2 3 6
6 11 2 3 7
8 14 3 4 9
8 15 3 4 9
8 14 3 4 9
8 15 3 4 9
8 15 3 4 9
8 14 3 4 9

0.3
0.3
0.3
0.3
0.3
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2

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

Expert opinion

Low 1009 hPa centered at 80 nautical miles in the South-West of Fastnet Rock (South-West Ireland) moving at 26 knots to the North-East to be centered on the North of the Irish Sea.

For Grève de Saint Marc :
No gale warning.

We are 90% sure of the situation, because the atmosphere might not be as stable as forecast.

Very cloudy skies to overcast. The risk of seeing rain will remain low. In the evening, good clear periods but cloud building.
No precipitation. NW force 1 freshening NNE force 3 in the middle of the day then becoming N. Gusts reaching 13 knots in the middle of the day. Smooth sea. Low, fairly long swell from SW. Poor visibility becoming poor in the middle of the day then good.

Tides at Saint-Quay-Portrieux

93

Low tide 04h53 1.46m

High tide 10h36 11.24m

90

Low tide 17h08 1.75m

High tide 22h51 11.39m

www.shom.fr - © SHOM 2025

Consult the tides for August

Wed

13

-

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

Thu

14

-

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

Fri

15

-

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

Sat

16

-

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

Sun

17

-

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

Mon

18

-

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

Tue

19

-

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

Wed

20

-

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

Thu

21

-

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

Fri

22

-

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

Sat

23

-

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

Sun

24

-

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

Mon

25

-

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

Tue

26

-

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

Wed

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