Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 8 pm Wednesday 20 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
21.9° C
(Which is slightly warmer than usual)

How big are the waves at Niyodo Rivermouth today?

The current surf forecast for Niyodo Rivermouth at 3AM is: 0.9m 10s primary swell from a East-southeast direction and 1.2m 6s secondary swell from a South direction (forecast issued at 08:00pm May 20). The wind direction is predicted to be glassy and the swell rating is 2.

Time (JST) & DateWave HeightWave Period
Morning (21 May)5ft (1.6m)7s
Afternoon (21 May)5.5ft (1.7m)7s
Evening (21 May)7ft (2.2m)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 29mm), heaviest during Thu morning. Warm (max 26°C on Fri morning, min 20°C on Thu night). Wind will be generally light.

Wed
20
Thursday
21
Friday
22
Saturday
23
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
12 PM
3 PM
Rating
(10 max)
2
2
2
2
3
3
3
2
2
2
4
3
2
2
2
0
0
1
2
1
0
0
0
0
Swell
Height Map
Height MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
1
ESE
10
1
ESE
10
0.9
ESE
10
0.9
ESE
10
1.6
S
6
1.6
S
7
1.7
SSW
7
1.7
S
7
2.3
SSW
7
2.2
SSW
7
2.3
SW
8
2
SSW
8
1.5
SSW
7
1.3
SSW
7
1.2
SSW
7
1
SSW
7
0.9
S
6
0.8
S
6
0.9
E
10
1.7
ESE
6
2.1
ESE
7
2.5
ESE
8
3
ESE
8
3
ESE
8
Wave Graph
Metric surfscale
Energy kJ
204
186
154
151
209
240
293
303
545
516
616
429
231
168
124
96
68
51
148
180
407
784
1046
1145
Wind (km/h)
5
ENE
5
ENE
5
E
5
E
0
ENE
0
W
5
SSE
0
SE
10
SW
5
WSW
5
NNW
5
NW
10
NNW
10
NNW
10
N
20
SE
5
SSE
5
NW
5
ENE
10
ESE
20
ESE
25
SE
25
SE
20
SE
glassy
cross-off
cross-off
glassy
glassy
glassy
glassy
glassy
cross-on
cross
off
glassy
off
cross-off
off
cross-on
cross-on
cross-off
glassy
cross
cross-on
cross-on
cross-on
cross-on
High Tide
9:31PM1.67m
8:11AM1.69m
10:33PM1.59m
9:10AM1.57m
11:39PM1.53m
10:29AM1.44m
Low Tide
2:46AM1.06m
3:21PM0.20m
3:50AM1.09m
4:23PM0.37m
5:12AM1.07m
light rain
rain showers
rain showers
part cloud
cloud
cloud
mod rain
light rain
light rain
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
cloud
part cloud
light rain
light rain
light rain
light rain
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:01
5:00
5:00
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:00
7:01
7:02
7:02
1
1
1
9
3
2
1
3
2
2
3
Temp °C
22
23
22
22
22
22
22
22
23
23
22
21
20
24
26
24
23
21
21
20
21
21
21
21
26
26
25
25
26
26
26
26
26
27
25
24
21
24
25
23
25
22
23
20
21
20
19
20
Swell 1
Height (m)
Direction
Period (s)
1
ESE
10
1
ESE
10
1
S
6
1.2
S
6
1.3
S
6
1.4
S
7
1.4
S
7
0.9
ESE
9
0.8
ESE
9
0.8
ESE
10
2
SSW
8
1.7
SSW
8
1.5
SSW
7
1.3
SSW
7
1.2
SSW
7
1
SSW
7
0.9
S
6
0.8
S
6
0.6
SSE
6
0.4
SW
6
0.3
SW
6
0.3
SW
6
Energy kJ
204
186
73
112
143
179
188
136
110
105
439
331
231
168
124
96
68
51
30
10
6
5
Swell 2
Height (m)
Direction
Period (s)
0.6
S
7
0.8
SSE
6
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
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
0.5
ESE
9
0.5
ESE
9
0.4
SSW
6
0.4
S
6
Energy kJ
34
53
154
151
148
142
136
81
83
81
83
83
80
50
50
15
11
Swell 3
Height (m)
Direction
Period (s)
0.1
SE
7
0.1
SE
8
0.2
SSE
8
0.5
SW
6
Energy kJ
2
2
6
19
Wind waves
Height (m)
Direction
Period (s)
0.9
SSE
7
1.1
S
6
1.6
S
6
1.6
S
7
1.7
SSW
7
1.7
S
7
2.3
SSW
7
2.2
SSW
7
2.3
SW
8
2
SSW
8
0.7
WNW
4
0.2
ENE
4
0.2
ENE
4
0.9
E
10
1.7
ESE
6
2.1
ESE
7
2.5
ESE
8
3
ESE
8
3
ESE
8
Energy kJ
62
80
209
240
293
303
545
516
616
429
17
1
2
148
180
407
784
1046
1145
Nearest Offshore or Glassy
Rating
(10 max)
2
2
2
2
3
3
3
2
1
3
4
3
2
2
2
1
1
1
2
2
1
1
1
1
Distance (km)
0
0
0
0
0
0
0
0
58
51
0
0
0
0
0
55
29
0
0
29
229
229
330
283
Best forecast wave conditions in Shikoku
Rating
(10 max)
2
2
2
2
3
3
3
2
1
3
4
3
2
2
2
1
1
1
2
2
Best forecast wave conditions in Japan
Rating
(10 max)
2
2
2
2
3
3
3
2
4
4
4
3
2
2
2
1
1
1
2
2
1
1
1
1
Header Global
Rating
(10 max)
4
4
4
5
5
5
5
5
5
5
5
5
4
5
5
7
7
7
6
5
5
5
5
6
  • 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

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