Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 2 pm Thursday 21 May 2026 JST
Forecast update in hr  min  s Forecast update imminent
Niyodo Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Niyodo Rivermouth sea temperature is
22.6° C
(Which is 1.4°C warmer than normal for this time of year)

How big are the waves at Niyodo Rivermouth today?

The current surf forecast for Niyodo Rivermouth at 9PM is: 2.1m 7s primary swell from a South-southwest direction and 0.8m 10s secondary swell from a East-southeast direction (forecast issued at 02:00pm May 21). The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (21 May)--
Afternoon (21 May)5ft (1.6m)7s
Evening (21 May)7ft (2.1m)7s

Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 32mm), heaviest during Sat night. Warm (max 26°C on Fri morning, min 20°C on Thu night). Wind will be generally light.

Thu
21
Friday
22
Saturday
23
Sun
24
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
Rating
(10 max)
2
1
2
2
3
2
2
2
1
0
0
1
1
0
0
0
0
0
3
3
3
4
3
3
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
1.6
S
7
1.6
S
7
2.2
SSW
7
2.1
SSW
7
2.2
SW
7
1.6
SSW
7
1.4
SSW
7
1.2
SSW
7
1
SSW
7
0.7
ESE
10
0.7
ESE
9
0.7
ESE
9
0.5
ESE
9
0.5
ESE
10
0.9
E
7
1.8
ESE
8
2.3
ESE
8
2.5
ESE
8
2.5
E
9
2.5
ESE
9
2.5
E
9
2.5
ESE
9
2.3
E
9
2.5
E
8
Wave Graph
Metric surfscale
Energy kJ
243
269
485
456
503
280
203
128
99
80
78
78
50
52
70
384
703
953
1075
1023
1131
1023
809
836
Wind (km/h)
10
S
5
SSW
5
SSW
10
WSW
5
NNW
10
NW
10
NNW
15
NNW
10
NNW
20
SE
5
S
0
NW
5
NNE
15
ESE
15
SE
20
ESE
20
ESE
25
ESE
10
ESE
10
E
10
E
10
NNE
10
NE
5
ENE
on
on
on
cross
cross-off
cross-off
off
off
off
cross-on
on
glassy
glassy
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
off
cross-off
cross-off
High Tide
10:33PM1.59m
9:10AM1.57m
11:39PM1.53m
10:29AM1.44m
00:43AM1.51m
Low Tide
3:21PM0.20m
3:50AM1.09m
4:23PM0.37m
5:12AM1.07m
5:32PM0.52m
6:43AM0.98m
light rain
thunderstorm
thunderstorm
part cloud
rain showers
clear
clear
clear
clear
clear
part cloud
cloud
part cloud
part cloud
rain showers
rain showers
light rain
light rain
light rain
mod rain
light rain
light rain
light rain
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:00
5:00
4:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:01
7:02
7:02
7:04
3
1
1
1
1
2
2
3
5
6
4
5
1
Temp °C
23
23
24
23
23
21
20
24
26
24
22
21
21
21
21
21
21
21
21
21
21
21
21
21
26
27
28
26
27
23
21
23
25
23
23
23
23
21
21
20
20
20
22
23
23
23
22
22
Swell 1
Height (m)
Direction
Period (s)
1.4
S
7
0.9
ESE
9
0.8
ESE
9
0.8
ESE
10
1.8
SSW
7
1.6
SSW
7
1.4
SSW
7
1.2
SSW
7
1
SSW
7
0.8
SSW
7
0.7
SSW
6
0.6
S
6
0.5
ESE
9
0.6
ENE
4
0.7
ESE
9
0.3
SW
6
2.5
E
9
2.5
E
9
2.5
ESE
9
2.3
E
9
0.4
SSW
6
Energy kJ
188
148
110
103
363
280
203
128
99
58
41
28
50
15
68
5
1075
1131
1023
809
10
Swell 2
Height (m)
Direction
Period (s)
0.9
ESE
9
0.7
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
ESE
9
0.7
ESE
9
0.5
S
6
0.5
ESE
10
0.5
S
6
0.5
S
6
0.6
S
5
0.1
S
8
Energy kJ
136
81
83
83
83
81
80
78
78
19
52
17
16
21
1
Swell 3
Height (m)
Direction
Period (s)
0.2
ENE
4
0.1
NE
4
0.1
NE
6
0.2
SSE
7
0.4
SW
6
0.5
S
6
0.3
SW
6
Energy kJ
2
1
1
5
9
17
6
Wind waves
Height (m)
Direction
Period (s)
1.6
S
7
1.6
S
7
2.2
SSW
7
2.1
SSW
7
2.2
SW
7
0.7
WNW
4
0.4
NW
3
0.4
NW
3
0.4
SSE
3
0.6
ESE
3
0.6
ENE
4
0.9
E
7
1.8
ESE
8
2.3
ESE
8
2.5
ESE
8
2.5
ESE
9
2.5
E
8
Energy kJ
243
269
485
456
503
11
2
3
4
8
13
70
384
703
953
1023
836
Nearest Offshore or Glassy
Rating
(10 max)
2
2
3
3
3
2
2
2
1
1
1
1
1
1
2
1
1
1
4
2
2
4
3
3
Distance (km)
51
51
51
51
0
0
0
0
0
29
61
0
0
29
29
229
229
224
29
245
183
0
0
0
Best forecast wave conditions in Shikoku
Rating
(10 max)
2
2
3
3
3
2
2
2
1
1
1
1
1
1
2
4
4
3
3
Best forecast wave conditions in Japan
Rating
(10 max)
2
2
3
3
3
2
2
2
1
1
1
1
1
1
2
1
1
2
4
2
2
4
3
3
Header Global
Rating
(10 max)
5
5
5
5
5
5
5
4
5
7
7
7
6
5
7
5
7
7
8
8
7
6
7
5
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Niyodo Rivermouth surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


Nearest locationNearest
Nearest locationNearest
Nearest locationNearest