Grassy Key (North) Sea Conditions and Tide Table

Grassy Key (North) 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 — and sunset is at 05:37 PM.

Days 1–4 Weather Summary

Mostly dry. Warm air temperatures (max 25°C on Thu afternoon, min 20°C on Fri night). Wind will be generally light.

Days 5–7 Weather Summary

Mostly dry. Warm air temperatures (max 23°C on Sun afternoon, min 21°C on Sun night). Mainly strong winds.

Days 8–10 Weather Summary

Mostly dry. Warm (max 23°C on Thu night, min 21°C on Fri night). Mainly fresh winds.

Days 11–13 Weather Summary

Some drizzle, heaviest during Tue afternoon. Warm (max 24°C on Tue afternoon, min 20°C on Sun morning). Wind will be generally light.

Thu
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tue
30
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
AM
Wave Height Map
High Tide
3:43PM0.24m
2:03AM0.44m
3:47PM0.24m
2:46AM0.45m
4:14PM0.24m
3:29AM0.46m
4:48PM0.25m
4:11AM0.46m
5:26PM0.25m
4:53AM0.45m
6:05PM0.25m
5:37AM0.44m
6:45PM0.27m
6:24AM0.41m
7:25PM0.28m
7:15AM0.37m
8:07PM0.31m
8:13AM0.32m
8:51PM0.34m
9:20AM0.27m
9:38PM0.38m
10:38AM0.23m
10:29PM0.42m
12:17PM0.21m
Low Tide
8:37PM0.17m
9:56AM-0.02m
9:10PM0.16m
10:38AM-0.03m
9:38PM0.16m
11:18AM-0.02m
10:00PM0.16m
11:59AM-0.02m
10:19PM0.16m
12:38PM-0.01m
10:48PM0.16m
1:17PM0.01m
11:40PM0.16m
1:54PM0.04m
1:09AM0.15m
2:31PM0.06m
2:56AM0.12m
3:10PM0.10m
4:21AM0.08m
3:52PM0.12m
5:31AM0.03m
4:40PM0.15m
6:33AM-0.03m
Wave
height (m) 
direction
period (s) 
0.4
SE
3
0.2
ESE
2
0.1
S
2
0.2
WNW
2
0.4
NW
2
0.4
NNE
3
0.3
ENE
2
0.3
E
3
0.4
ENE
3
0.4
E
3
0.6
ENE
3
0.7
ENE
3
0.8
ENE
4
0.9
ENE
4
0.9
E
4
0.7
E
4
0.7
E
4
0.6
E
3
0.6
E
3
0.7
ENE
3
0.7
ENE
3
0.7
E
4
0.6
E
3
0.5
E
3
0.5
E
3
0.4
ENE
3
0.4
NE
3
0.4
E
3
0.2
ENE
2
0.2
ENE
2
0.1
NE
2
0.1
E
2
0.1
E
2
0.1
E
2
0.2
ESE
2
0.4
SE
3
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
some clouds
some clouds
some clouds
clear
clear
clear
clear
clear
clear
some clouds
some clouds
clear
some clouds
some clouds
some clouds
some clouds
clear
clear
clear
clear
clear
clear
some clouds
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
some clouds
 km/h
15
SE
10
SE
15
W
20
NW
20
NNW
25
NNE
20
E
20
ENE
20
ENE
25
ENE
30
NE
35
NE
40
NE
40
ENE
35
ENE
30
ENE
35
ENE
30
ENE
30
ENE
30
ENE
30
ENE
35
ENE
25
ENE
25
ENE
25
ENE
20
ENE
20
NE
20
ENE
15
NE
15
NNE
10
E
10
ENE
10
E
10
E
15
ESE
20
ESE
 mm 
max°C
25
25
25
23
23
23
23
23
24
23
23
22
22
23
23
23
23
23
22
22
22
22
23
22
23
22
22
22
22
21
22
22
22
22
23
23
Moonrise
6:49
7:41
8:29
9:13
9:53
10:28
11:02
11:34
12:06
12:41
1:19
2:03
Moonset
4:25
5:15
6:09
7:06
8:04
9:01
9:58
10:54
11:51
12:50
1:51
2:57
Sunrise
7:01
7:03
7:03
7:03
7:03
7:05
7:05
7:05
7:05
7:05
7:07
7:07
Sunset
5:37
5:38
5:38
5:38
5:39
5:40
5:40
5:42
5:42
5:43
5:43
5:44
Today's sea temperature in Grassy Key (North) is
23.5° C
(Statistics for 18 Dec 1981-2005 – mean: 24.7 max: 26.3 min: 22.9°C)
Issued (local time): 6 pm Thursday 18 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest