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 05:22 AM and sunset is at 09:08 PM.

Days 1–3 Weather Summary

Moderate rain (total 13mm), heaviest on Sat morning. Cool air temperatures (max 19°C on Sun afternoon, min 10°C on Fri night). Wind will be generally light.

Days 4–6 Weather Summary

Mostly dry. Warm air temperatures (max 22°C on Mon afternoon, min 12°C on Mon night). Wind will be generally light.

Days 7–9 Weather Summary

Mostly dry. Warm (max 22°C on Sat afternoon, min 8°C on Fri night). Wind will be generally light.

Days 10–12 Weather Summary

Mostly dry. Warm (max 20°C on Sun afternoon, min 9°C on Sun night). Wind will be generally light.

Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Thursday
26
Friday
27
Saturday
28
Sunday
29
Monday
30
Tuesday
1
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
10:07AM1.80m
10:10PM2.59m
11:25AM1.81m
10:58PM2.70m
12:34PM1.88m
11:48PM2.78m
1:36PM1.95m
00:38AM2.82m
2:33PM2.02m
1:30AM2.81m
3:26PM2.08m
2:21AM2.76m
4:16PM2.12m
3:12AM2.68m
5:02PM2.15m
5:46PM2.18m
6:29PM2.20m
5:45AM2.20m
7:10PM2.22m
6:41AM2.00m
7:50PM2.24m
Low Tide
4:10PM0.46m
5:43AM0.03m
5:09PM0.60m
6:44AM-0.19m
6:09PM0.69m
7:41AM-0.36m
7:08PM0.75m
8:35AM-0.47m
8:06PM0.78m
9:26AM-0.51m
9:03PM0.77m
10:14AM-0.49m
9:58PM0.75m
11:00AM-0.42m
10:51PM0.72m
11:44AM-0.32m
11:44PM0.69m
12:24PM-0.18m
00:38AM0.66m
1:04PM-0.02m
1:34AM0.62m
1:43PM0.16m
2:34AM0.55m
Wave
height (m) 
direction
period (s) 
light rain
light rain
light rain
mod rain
light rain
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
clear
part cloud
cloud
cloud
cloud
cloud
cloud
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
light rain
light rain
light rain
mod rain
light rain
some clouds
some clouds
clear
clear
clear
some clouds
some clouds
clear
some clouds
cloudy
cloudy
cloudy
cloudy
cloudy
some clouds
clear
some clouds
clear
clear
clear
clear
some clouds
some clouds
clear
clear
clear
clear
some clouds
cloudy
cloudy
cloudy
 km/h
5
WSW
10
W
5
WSW
0
S
5
ESE
5
E
0
WSW
15
W
0
NNE
5
WNW
10
WNW
0
NW
10
W
15
W
5
WSW
10
W
10
W
5
WNW
5
W
15
W
5
W
5
WNW
15
WNW
0
WNW
5
W
15
WNW
5
WNW
10
WNW
15
WNW
5
W
10
W
15
W
0
S
0
SW
10
WNW
5
W
 mm 
2
2
2
6
1
max°C
11
13
12
12
12
12
17
19
16
20
22
18
20
20
15
15
16
15
14
17
16
16
19
14
18
22
16
17
20
14
18
19
16
16
18
16
Moonrise
1:47
2:09
2:37
3:13
4:03
5:07
6:22
7:41
8:59
10:14
11:24
12:31
Moonset
3:54
5:18
6:44
8:06
9:17
10:12
10:53
11:23
11:45
12:03
12:20
Sunrise
5:22
5:22
5:22
5:22
5:22
5:22
5:24
5:24
5:24
5:24
5:26
5:26
Sunset
9:08
9:08
9:08
9:08
9:08
9:08
9:09
9:09
9:08
9:08
9:08
9:08
Today's sea temperature in Knappa, Knappa Slough, Columbia River is 17.6 °C (Statistics for 20 Jun 1981-2005 – mean: 13.9 max: 15.5 min: 12.8°C)
Issued (local time): 4 am Friday 20 Jun 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
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