Mercer Island Sea Conditions and Tide Table

Mercer Island 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 —.

Days 1–4 Weather Summary

Heavy rain (total 37mm), heaviest during Sun night. Cool air temperatures (max 14°C on Mon morning, min 8°C on Mon night). Winds increasing (light winds from the S on Sat night, fresh winds from the SW by Mon afternoon).

Days 5–7 Weather Summary

Heavy rain (total 39mm), heaviest during Tue night. Cool air temperatures (max 12°C on Tue night, min 4°C on Thu night). Winds decreasing (fresh winds from the SSW on Tue night, light winds from the SSE by Thu morning).

Days 8–10 Weather Summary

Heavy rain (total 21mm), heaviest during Sun morning. Mild temperatures (max 8°C on Sun afternoon, min 2°C on Sat night). Wind will be generally light.

Days 11–13 Weather Summary

Light rain (total 3mm), mostly falling on Wed morning. Mild temperatures (max 6°C on Wed night, min 1°C on Mon night). Wind will be generally light.

Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thu
25
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
PM
Wave Height Map
High Tide
1:34AM2.16m
10:55AM3.07m
3:10AM2.45m
11:13AM3.04m
3:56AM2.69m
11:34AM3.02m
4:29AM2.88m
11:59AM3.02m
5:02AM3.01m
12:30PM3.04m
5:36AM3.10m
1:04PM3.06m
6:13AM3.14m
1:39PM3.07m
6:49AM3.16m
2:12PM3.06m
7:24AM3.17m
2:43PM3.00m
7:54AM3.18m
3:14PM2.88m
8:18AM3.18m
3:51PM2.69m
8:37AM3.17m
4:51PM2.42m
Low Tide
3:49AM2.13m
6:58PM0.98m
4:57AM2.43m
7:27PM0.74m
7:57PM0.55m
7:42AM2.76m
8:29PM0.40m
8:41AM2.83m
9:03PM0.29m
9:28AM2.87m
9:39PM0.21m
10:10AM2.90m
10:15PM0.18m
10:52AM2.91m
10:50PM0.19m
11:41AM2.89m
11:23PM0.26m
12:41PM2.81m
11:55PM0.40m
1:53PM2.66m
00:25AM0.61m
3:07PM2.40m
Wave
height (m) 
direction
period (s) 
light rain
cloud
cloud
heavy rain
light rain
rain showers
rain showers
mod rain
light rain
rain showers
part cloud
cloud
light rain
mod rain
light rain
rain showers
light rain
rain showers
part cloud
cloud
cloud
light rain
heavy rain
light rain
cloud
cloud
part cloud
clear
clear
part cloud
cloud
light rain
light rain
cloud
part cloud
part cloud
light rain
cloudy
cloudy
heavy rain
light rain
rain shwrs
rain shwrs
mod rain
light rain
rain shwrs
some clouds
cloudy
light rain
mod rain
light rain
rain shwrs
light rain
rain shwrs
some clouds
cloudy
cloudy
light rain
heavy rain
light rain
cloudy
cloudy
some clouds
clear
clear
some clouds
cloudy
light rain
light rain
cloudy
some clouds
some clouds
 km/h
5
S
10
SSE
5
SSE
10
SW
20
SSW
30
SW
15
SSW
10
S
20
SSW
35
SSW
20
SW
20
SSW
10
SE
5
SSE
25
SSW
10
S
10
SSW
10
SSW
15
SSW
15
S
15
SSW
5
ESE
5
E
30
SSW
15
SSW
10
SSW
10
SW
5
SSE
5
NE
10
N
10
NNE
10
N
0
WNW
5
S
5
N
5
N
 mm 
1
18
3
1
1
8
5
23
5
7
1
1
1
1
4
14
3
1
2
max°C
11
11
11
12
14
13
9
11
12
12
8
8
7
7
9
6
6
6
5
7
7
5
5
8
7
7
6
3
4
3
1
3
4
6
5
5
Moonrise
2:41
3:48
4:56
6:04
7:10
8:09
8:59
9:39
10:10
10:35
10:55
11:12
Moonset
1:07
1:25
1:47
2:15
2:51
3:38
4:36
5:43
6:54
8:07
9:20
Sunrise
7:48
7:50
7:50
7:50
7:52
7:52
7:52
7:54
7:54
7:54
7:54
7:54
Sunset
4:16
4:16
4:17
4:17
4:17
4:19
4:19
4:20
4:20
4:21
4:21
4:22
Today's sea temperature in Mercer Island is
11.2° C
(Statistics for 13 Dec 1981-2005 – mean: 8.7 max: 10.0 min: 7.2°C)
Issued (local time): 9 pm Saturday 13 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest