Mad River Slough, Arcata Bay, Humboldt Bay Sea Conditions and Tide Table

Mad River Slough, Arcata Bay, Humboldt Bay 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 52mm), heaviest during Thu night. Cool air temperatures (max 15°C on Thu night, min 8°C on Fri night). Winds decreasing (fresh winds from the S on Thu night, calm by Sat afternoon).

Days 5–7 Weather Summary

Heavy rain (total 52mm), heaviest during Tue night. Cool air temperatures (max 12°C on Mon morning, min 6°C on Tue night). Wind will be generally light.

Days 8–10 Weather Summary

Heavy rain (total 39mm), heaviest during Wed night. Very mild (max 12°C on Fri morning, min 8°C on Fri night). Winds decreasing (fresh winds from the S on Wed night, light winds from the SSE by Sat afternoon).

Days 11–13 Weather Summary

Moderate rain (total 17mm), heaviest on Sun afternoon. Very mild (max 11°C on Sun night, min 6°C on Mon night). Wind will be generally light.

Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tue
30
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
00:53AM1.83m
11:08AM2.55m
1:29AM1.86m
11:44AM2.55m
2:05AM1.87m
12:20PM2.52m
2:41AM1.89m
12:57PM2.47m
3:18AM1.91m
1:36PM2.37m
3:55AM1.95m
2:19PM2.24m
4:32AM2.02m
3:11PM2.07m
5:09AM2.12m
4:15PM1.88m
5:48AM2.24m
5:34PM1.70m
6:28AM2.39m
7:03PM1.59m
7:12AM2.55m
8:34PM1.59m
8:00AM2.70m
Low Tide
5:04AM1.28m
6:18PM-0.20m
5:43AM1.28m
6:53PM-0.23m
6:21AM1.28m
7:29PM-0.23m
7:01AM1.26m
8:04PM-0.21m
7:45AM1.24m
8:40PM-0.15m
8:35AM1.20m
9:17PM-0.05m
9:33AM1.13m
9:55PM0.09m
10:41AM1.01m
10:36PM0.29m
11:53AM0.81m
11:21PM0.51m
1:04PM0.55m
00:13AM0.73m
2:09PM0.26m
1:12AM0.93m
3:09PM-0.04m
Wave
height (m) 
direction
period (s) 
3
W
11
3
WNW
11
3
WNW
11
2.4
WNW
11
2.3
WNW
12
2.1
WNW
11
1.9
WNW
11
1.7
WNW
11
1.7
WNW
11
1.8
WNW
11
2
WNW
10
2
WNW
10
2.1
WNW
12
2.5
WNW
12
2.4
WNW
12
2.3
WNW
12
2
WNW
12
1.9
WNW
11
2.5
SSW
8
4
W
14
4
W
12
4.5
W
13
4
WSW
12
3
WSW
11
2.4
W
10
1.7
W
9
1.5
W
9
1.4
W
8
2.2
WSW
8
3
W
13
3.5
W
12
3
W
12
3
W
11
3
WNW
11
2.5
WNW
12
3
WNW
13
heavy rain
heavy rain
cloud
part cloud
cloud
light rain
mod rain
light rain
cloud
rain showers
part cloud
part cloud
cloud
cloud
cloud
rain showers
part cloud
heavy rain
rain showers
thunderstorm
light rain
rain showers
thunderstorm
rain showers
rain showers
clear
part cloud
cloud
light rain
light rain
mod rain
light rain
light rain
part cloud
cloud
part cloud
heavy rain
heavy rain
cloudy
some clouds
cloudy
light rain
mod rain
light rain
cloudy
rain shwrs
some clouds
some clouds
cloudy
cloudy
cloudy
rain shwrs
some clouds
heavy rain
rain shwrs
risk tstorm
light rain
rain shwrs
risk tstorm
rain shwrs
rain shwrs
clear
some clouds
cloudy
light rain
light rain
mod rain
light rain
light rain
some clouds
cloudy
some clouds
 km/h
30
S
10
WSW
15
N
5
NE
5
E
10
NW
5
NNE
10
NW
5
WSW
5
SSE
10
SSE
10
SW
5
SE
5
E
5
NE
10
NNE
15
SE
25
SE
40
S
30
S
30
S
35
SSE
25
SSE
25
SSW
10
SE
10
SE
5
SSE
20
SE
25
SE
25
SE
25
SE
10
WNW
5
NE
5
E
5
ESE
10
SSW
 mm 
24
13
2
10
3
1
39
12
14
4
3
9
3
5
1
2
4
8
2
1
max°C
15
13
11
10
11
10
11
11
11
11
12
12
10
11
11
9
11
11
10
10
10
10
12
11
10
12
12
10
10
9
11
10
8
8
9
9
Moonrise
7:43
8:34
9:17
9:53
10:23
10:49
11:12
11:34
11:56
12:19
12:47
1:21
Moonset
4:19
5:16
6:18
7:24
8:31
9:38
10:45
11:53
1:04
2:17
3:35
Sunrise
7:35
7:37
7:37
7:37
7:37
7:39
7:39
7:39
7:39
7:39
7:39
7:39
Sunset
4:51
4:51
4:52
4:52
4:52
4:52
4:53
4:53
4:54
4:55
4:57
4:57
Today's sea temperature in Mad River Slough, Arcata Bay, Humboldt Bay is
12.7° C
(Statistics for 18 Dec 1981-2005 – mean: 11.6 max: 13.5 min: 10.1°C)
Issued (local time): 9 pm Thursday 18 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
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