Grande-Synthe Sea Conditions and Tide Table

Grande-Synthe Sea Conditions table showing wave height, swell direction and period.

High and low tide times are also provided on the table along with the moon phase and forecast weather. Sunrise today is at 08:00 AM and sunset is at 05:07 PM.

Days 1–3 Weather Summary

Light rain (total 5mm), mostly falling on Thu night. Cool air temperatures (max 16°C on Wed afternoon, min 10°C on Tue morning). Winds decreasing (fresh winds from the S on Tue night, light winds from the SSW by Thu night).

Days 4–6 Weather Summary

Moderate rain (total 10mm), heaviest on Fri night. Cool air temperatures (max 16°C on Sat afternoon, min 10°C on Sun night). Wind will be generally light.

Days 7–9 Weather Summary

Light rain (total 9mm), mostly falling on Mon afternoon. Very mild (max 10°C on Mon morning, min 4°C on Wed morning). Mainly fresh winds.

Days 10–12 Weather Summary

Light rain (total 2mm), mostly falling on Sat night. Very mild (max 11°C on Sat afternoon, min 5°C on Thu morning). Winds increasing (light winds from the WSW on Thu night, strong winds from the SSW by Sat afternoon).

Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
Wave Height Map
High Tide
5:02PM4.94m
5:26AM4.62m
6:06PM4.53m
6:32AM4.31m
7:19PM4.27m
7:46AM4.17m
8:35PM4.23m
8:58AM4.22m
9:40PM4.35m
9:58AM4.41m
10:31PM4.55m
10:47AM4.64m
11:13PM4.76m
11:29AM4.87m
11:52PM4.95m
12:08PM5.07m
00:28AM5.10m
12:44PM5.22m
1:03AM5.19m
1:19PM5.30m
1:37AM5.23m
1:55PM5.30m
2:12AM5.20m
Low Tide
11:27AM0.94m
00:04AM1.31m
12:31PM1.24m
1:13AM1.61m
1:45PM1.42m
2:28AM1.73m
3:00PM1.43m
3:39AM1.67m
4:06PM1.32m
4:38AM1.48m
5:00PM1.15m
5:25AM1.26m
5:44PM0.97m
6:05AM1.06m
6:23PM0.83m
6:41AM0.89m
6:59PM0.72m
7:15AM0.76m
7:33PM0.66m
7:48AM0.70m
8:07PM0.66m
8:22AM0.69m
8:42PM0.73m
Wave
height (m) 
direction
period (s) 
1.2
WSW
6.0
1
WSW
6.0
1.3
SW
5.0
1.1
SW
5.0
0.8
WSW
6.0
0.9
SW
4.0
0.9
SW
4.0
0.8
WSW
5.0
0.4
N
11.0
0.5
N
8.0
0.6
N
11.0
1.2
NNE
7.0
1.1
NNE
8.0
0.9
NNE
8.0
0.8
NNE
8.0
1
NNE
4.0
1.1
NNE
5.0
1.6
NNE
7.0
1.3
NNE
6.0
1.4
N
6.0
1.7
N
6.0
1.8
N
6.0
1.6
N
6.0
1.4
NNW
6.0
0.9
N
8.0
0.8
N
7.0
1
WNW
4.0
1.5
NNW
5.0
1.7
N
7.0
1.3
NNW
6.0
1.3
WSW
5.0
2.2
WSW
7.0
2.3
WSW
7.0
1.8
WSW
7.0
2
WSW
7.0
2
WSW
7.0
clear
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
cloud
light rain
cloud
part cloud
mod rain
rain showers
rain showers
part cloud
cloud
cloud
part cloud
part cloud
rain showers
rain showers
part cloud
part cloud
part cloud
cloud
part cloud
rain showers
clear
clear
part cloud
cloud
cloud
cloud
cloud
cloud
rain showers
clear
some clouds
some clouds
some clouds
some clouds
some clouds
cloudy
cloudy
light rain
cloudy
some clouds
mod rain
rain shwrs
rain shwrs
some clouds
cloudy
cloudy
some clouds
some clouds
rain shwrs
rain shwrs
some clouds
some clouds
some clouds
cloudy
some clouds
rain shwrs
clear
clear
some clouds
cloudy
cloudy
cloudy
cloudy
cloudy
rain shwrs
 km/h
20
SSW
25
S
30
S
25
S
20
S
20
S
20
S
15
SSW
10
SSE
15
ESE
15
E
5
SE
10
SSE
10
SE
5
ENE
20
NE
25
NE
25
NE
25
N
30
NNW
30
NNW
30
NW
25
WNW
20
WNW
15
WSW
15
W
15
WSW
30
NW
30
WNW
15
W
30
SSW
35
SW
35
SSW
30
SSW
40
S
30
SSW
 mm 
5
7
1
2
3
4
2
2
max°C
14
14
13
15
16
14
15
16
14
15
15
14
15
16
13
12
11
11
10
9
9
6
6
6
6
6
6
6
7
7
7
7
9
10
11
11
Moonrise
11:05
12:25
1:41
2:53
4:04
5:15
6:27
7:39
8:51
10:00
11:02
Moonset
2:12
2:30
2:44
2:55
3:06
3:16
3:28
3:42
4:00
4:24
4:57
5:41
Sunrise
8:00
8:00
8:03
8:04
8:06
8:07
8:10
8:11
8:12
8:15
8:15
8:18
Sunset
5:07
5:07
5:06
5:04
5:02
5:01
5:00
4:59
4:58
4:57
4:55
4:54
Today's sea temperature in Grande-Synthe is 13.6 °C (Statistics for 11 Nov 1981-2005 – mean: 12.6 max: 13.7 min: 10.8°C)
Issued (local time): 6 am Tuesday 11 Nov 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
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