Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 2 pm Monday 18 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
21.6° C
(Which is slightly warmer than usual)

How big are the waves at Niyodo Rivermouth today?

The current surf forecast for Niyodo Rivermouth at 9PM is: 0.9m 9s primary swell from a East-southeast direction and 0.3m 12s secondary swell from a Southeast direction (forecast issued at 02:00pm May 18). The wind direction is predicted to be cross-offshore.

Time (JST) & DateWave HeightWave Period
Morning (18 May)--
Afternoon (18 May)3ft (0.9m)9s
Evening (18 May)3ft (0.9m)9s

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 40mm), heaviest during Wed morning. Warm (max 24°C on Mon afternoon, min 18°C on Mon night). Wind will be generally light.

Mon
18
Tuesday
19
Wednesday
20
Thu
21
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)
0
0
1
1
1
1
1
1
0
0
0
1
1
1
2
2
2
2
2
2
2
1
2
0
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)
0.9
ESE
9
0.9
ESE
9
0.8
ESE
9
0.9
ESE
9
0.8
ESE
9
0.9
ESE
9
0.9
ESE
8
0.7
ESE
8
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
1
ESE
10
1
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
1.6
SSW
6
Wave Graph
Metric surfscale
Energy kJ
113
113
106
111
99
106
103
70
154
154
175
170
170
166
163
163
160
157
190
186
154
151
148
188
Wind (km/h)
10
SSE
10
SSE
5
SE
5
NE
5
NE
5
NNE
5
NE
5
SSE
10
S
10
S
5
SSE
5
NNE
5
NNE
5
NE
5
NE
5
ESE
5
SE
5
ENE
10
ENE
5
E
5
E
5
E
5
E
10
SSW
on
on
glassy
cross-off
cross-off
cross-off
cross-off
glassy
on
on
cross-on
glassy
off
cross-off
glassy
glassy
glassy
cross-off
cross-off
glassy
glassy
cross
glassy
on
High Tide
7:41PM1.85m
6:39AM1.85m
8:34PM1.77m
7:22AM1.79m
9:31PM1.67m
8:11AM1.69m
Low Tide
1:09AM0.92m
1:36PM-0.06m
1:54AM1.00m
2:26PM0.05m
2:46AM1.06m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
cloud
part cloud
light rain
heavy rain
rain showers
rain showers
cloud
light rain
cloud
light rain
mod rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:01
5:01
5:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:00
7:00
7:00
7:01
1
13
6
1
1
1
7
Temp °C
25
24
23
20
19
18
18
22
23
23
22
19
19
20
20
22
21
21
23
22
22
22
22
22
24
24
25
21
20
19
19
22
22
22
23
20
19
21
21
24
24
24
26
25
25
25
26
24
Swell 1
Height (m)
Direction
Period (s)
0.9
ESE
9
0.9
ESE
9
0.8
ESE
9
0.9
ESE
9
0.8
ESE
9
0.9
ESE
9
0.9
ESE
8
0.7
ESE
8
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
1.2
S
6
1.2
S
6
1.2
S
6
1.2
S
7
1.3
S
6
1.4
S
6
Energy kJ
113
113
106
111
99
106
103
70
154
154
175
170
170
166
163
163
160
157
104
109
120
124
137
163
Swell 2
Height (m)
Direction
Period (s)
0.3
SE
12
0.1
SE
10
0.1
SE
10
0.3
SE
12
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.5
SE
10
0.5
E
8
0.4
E
9
0.4
SSE
7
0.5
SSE
7
0.5
SSE
7
0.7
SSE
7
0.7
SSE
7
0.3
S
8
1
ESE
10
1
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
Energy kJ
23
4
4
21
31
30
30
50
33
25
18
27
27
40
40
10
190
186
154
151
148
145
Swell 3
Height (m)
Direction
Period (s)
0.1
SE
10
0.1
SE
12
0.1
SE
12
0.3
ESE
10
0.3
S
7
Energy kJ
4
6
6
20
8
Wind waves
Height (m)
Direction
Period (s)
0.2
ESE
2
0.4
SE
4
0.9
SSE
6
0.9
SSE
6
1
SSE
6
1.6
SSW
6
Energy kJ
1
3
45
45
69
188
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
Distance (km)
645
58
0
0
0
0
0
0
51
51
58
0
0
0
0
0
0
0
0
0
0
51
0
51
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
3
Best forecast wave conditions in Japan
Rating
(10 max)
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
3
Header Global
Rating
(10 max)
4
6
5
4
4
5
5
4
4
4
4
4
4
4
4
4
5
5
4
5
5
5
5
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

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