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 08:47 AM and sunset is at 04:44 PM.

Days 1–3 Weather Summary

Some drizzle, heaviest during Mon night. Cool air temperatures (max 11°C on Mon night, min 7°C on Mon morning). Wind will be generally light.

Days 4–6 Weather Summary

Light rain (total 2mm), mostly falling on Thu night. Cool air temperatures (max 12°C on Thu night, min 6°C on Sat morning). Winds decreasing (fresh winds from the S on Thu afternoon, light winds from the WSW by Sat night).

Days 7–9 Weather Summary

Light rain (total 5mm), mostly falling on Sun morning. Mild temperatures (max 9°C on Tue night, min 6°C on Mon night). Wind will be generally light.

Days 10–12 Weather Summary

Mostly dry. Mild temperatures (max 8°C on Wed morning, min 4°C on Wed night). Mainly fresh winds.

Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
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
9:08AM4.27m
9:43PM4.29m
10:04AM4.37m
10:34PM4.42m
10:54AM4.53m
11:19PM4.58m
11:39AM4.72m
00:01AM4.74m
12:21PM4.89m
00:40AM4.90m
1:00PM5.03m
1:18AM5.04m
1:38PM5.13m
1:56AM5.15m
2:16PM5.18m
2:33AM5.21m
2:55PM5.19m
3:11AM5.23m
3:35PM5.15m
3:52AM5.19m
4:17PM5.09m
4:35AM5.10m
5:04PM4.99m
5:23AM4.97m
Low Tide
4:09PM1.48m
4:38AM1.59m
5:04PM1.38m
5:28AM1.42m
5:52PM1.24m
6:13AM1.23m
6:35PM1.08m
6:54AM1.04m
7:15PM0.94m
7:33AM0.88m
7:54PM0.84m
8:12AM0.76m
8:31PM0.78m
8:49AM0.68m
9:08PM0.79m
9:27AM0.67m
9:46PM0.84m
10:05AM0.70m
10:23PM0.93m
10:44AM0.78m
11:03PM1.05m
11:25AM0.89m
11:46PM1.18m
Wave
height (m) 
direction
period (s) 
1.2
WSW
6
1
WSW
6
0.8
SSW
4
0.7
SW
5
0.4
WSW
6
0.8
NNW
4
0.4
NNE
4
0.3
WSW
2
0.9
SW
4
1.2
WSW
6
1.3
SSW
4
1.8
SW
6
1
W
5
0.7
W
4
0.7
WSW
4
1.2
WSW
5
1.3
WSW
6
1.5
WSW
7
0.7
W
5
0.6
NW
3
0.6
N
4
1
NNW
5
1.2
N
5
1.1
N
6
0.8
N
6
0.7
N
6
1.3
N
5
1.4
N
6
1.2
N
6
1
N
6
0.9
NNE
6
1
NNE
5
1.2
NNE
5
1.3
NNE
6
1
NNE
5
1.7
NNE
6
clear
cloud
rain showers
part cloud
cloud
cloud
clear
cloud
cloud
part cloud
part cloud
light rain
cloud
part cloud
clear
part cloud
cloud
light rain
light rain
cloud
part cloud
light rain
cloud
part cloud
clear
light rain
part cloud
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
clear
cloudy
rain shwrs
some clouds
cloudy
cloudy
clear
cloudy
cloudy
some clouds
some clouds
light rain
cloudy
some clouds
clear
some clouds
cloudy
light rain
light rain
cloudy
some clouds
light rain
cloudy
some clouds
clear
light rain
some clouds
clear
clear
some clouds
some clouds
clear
some clouds
some clouds
some clouds
some clouds
 km/h
25
S
20
S
20
SSE
20
S
5
SSW
25
N
5
W
10
SW
25
SSW
25
S
35
S
35
SSW
20
W
15
WSW
15
SSW
20
SSW
25
SSW
30
S
5
WNW
15
NNW
15
NW
20
NNW
20
NNW
20
NW
15
WSW
15
W
20
NNE
20
NE
20
NE
15
ENE
15
ENE
25
NE
20
ENE
20
ENE
20
NNE
30
NNE
 mm 
1
1
1
2
2
1
max°C
9
10
11
11
11
10
9
9
9
10
11
12
9
10
9
6
7
7
8
8
7
8
8
7
6
7
9
8
8
7
5
5
5
5
8
8
Moonrise
4:16
5:28
6:40
7:51
8:55
9:49
10:30
11:00
11:23
11:40
11:54
12:06
Moonset
1:49
2:05
2:27
2:57
3:38
4:33
5:39
6:53
8:10
9:27
10:45
Sunrise
8:47
8:48
8:48
8:48
8:49
8:51
8:51
8:52
8:52
8:52
8:52
8:52
Sunset
4:44
4:44
4:44
4:45
4:45
4:45
4:45
4:45
4:46
4:47
4:47
4:49
Today's sea temperature in Grande-Synthe is
10.4° C
(Statistics for 15 Dec 1981-2005 – mean: 9.8 max: 11.0 min: 8.4°C)
Issued (local time): 12 pm Monday 15 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
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