Knappa, Knappa Slough, Columbia River Sea Conditions and Tide Table

Knappa, Knappa Slough, Columbia River 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

Light rain (total 6mm), mostly falling on Thu afternoon. Cool air temperatures (max 10°C on Thu morning, min 5°C on Wed night). Wind will be generally light.

Days 5–7 Weather Summary

Mostly dry. Cool air temperatures (max 10°C on Tue morning, min 2°C on Sun night). Wind will be generally light.

Days 8–10 Weather Summary

Light rain (total 7mm), mostly falling on Fri afternoon. Very mild (max 11°C on Thu morning, min 5°C on Tue night). Wind will be generally light.

Days 11–13 Weather Summary

Heavy rain (total 54mm), heaviest during Fri night. Very mild (max 10°C on Fri night, min 3°C on Sun night). Winds decreasing (strong winds from the S on Fri night, calm by Sat night).

Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thursday
1
Friday
2
Saturday
3
Sunday
4
Mon
5
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
5:39AM2.33m
4:46PM2.36m
6:17AM2.40m
5:48PM2.17m
6:58AM2.50m
7:05PM2.00m
7:44AM2.61m
8:31PM1.89m
8:33AM2.72m
9:54PM1.90m
9:24AM2.83m
11:08PM1.97m
10:18AM2.93m
00:15AM2.08m
11:12AM2.96m
1:12AM2.19m
12:07PM3.00m
2:04AM2.30m
1:01PM3.00m
2:52AM2.38m
1:54PM2.95m
3:36AM2.44m
2:45PM2.85m
Low Tide
11:23PM0.05m
11:45AM0.90m
00:01AM0.16m
12:44PM0.81m
00:43AM0.30m
1:50PM0.68m
1:32AM0.48m
3:02PM0.49m
2:28AM0.65m
4:12PM0.27m
3:30AM0.80m
5:16PM0.04m
4:35AM0.91m
6:17PM-0.15m
5:41AM0.98m
7:12PM-0.29m
8:03PM-0.37m
7:42AM0.91m
8:52PM-0.39m
8:37AM0.85m
9:37PM-0.35m
9:31AM0.78m
Wave
height (m) 
direction
period (s) 
cloud
cloud
light rain
part cloud
light rain
rain showers
rain showers
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
cloud
cloud
part cloud
cloud
cloud
cloud
cloud
mod rain
heavy rain
heavy rain
mod rain
rain showers
light rain
rain showers
clear
cloud
light rain
cloudy
cloudy
light rain
some clouds
light rain
rain shwrs
rain shwrs
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
cloudy
cloudy
cloudy
some clouds
cloudy
cloudy
cloudy
cloudy
mod rain
heavy rain
heavy rain
mod rain
rain shwrs
light rain
rain shwrs
clear
cloudy
light rain
 km/h
10
E
10
E
5
ESE
5
E
5
WSW
10
W
15
WNW
5
WNW
5
WNW
0
SE
5
E
5
ESE
5
E
10
E
10
E
10
E
10
E
5
E
5
ESE
5
ESE
5
E
5
ESE
5
ESE
5
E
10
E
5
ENE
10
E
15
SE
40
SSW
20
WSW
5
SW
5
SE
5
S
5
ESE
10
E
10
E
 mm 
2
1
1
2
7
19
14
8
5
1
1
4
max°C
5
10
8
6
7
6
6
7
7
6
7
7
4
7
7
5
10
9
6
10
9
6
11
10
9
9
8
10
9
9
8
9
9
5
6
6
Moonrise
11:16
11:33
11:50
12:09
12:32
1:00
1:39
2:32
3:41
5:01
6:25
7:46
Moonset
9:27
10:39
11:52
1:07
2:26
3:50
5:15
6:36
7:46
8:40
9:20
9:49
Sunrise
7:54
7:56
7:56
7:56
7:56
7:56
7:56
7:56
7:56
7:56
7:56
7:56
Sunset
4:32
4:34
4:34
4:35
4:36
4:37
4:37
4:38
4:39
4:40
4:42
4:43
Today's sea temperature in Knappa, Knappa Slough, Columbia River is
10.5° C
(Statistics for 24 Dec 1981-2005 – mean: 9.6 max: 11.2 min: 8.2°C)
Issued (local time): 9 pm Wednesday 24 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest