Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 8 pm Sunday 17 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
21.0° C
(Which is normal for this time of year)

How big are the waves at Niyodo Rivermouth today?

The current surf forecast for Niyodo Rivermouth at 1AM is: 0.9m 9s primary swell from a East-southeast direction and 0.3m 12s secondary swell from a Southeast direction (forecast issued at 08:00pm May 17). The wind direction is predicted to be offshore.

Time (JST) & DateWave HeightWave Period
Morning (18 May)2.5ft (0.7m)9s
Afternoon (18 May)2.5ft (0.8m)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

Moderate rain (total 11mm), heaviest on Tue night. Warm (max 24°C on Mon morning, min 18°C on Sun night). Wind will be generally light.

Sun
17
Monday
18
Tuesday
19
Wednesday
20
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)
1
1
1
1
1
1
0
0
0
1
1
1
1
0
0
1
1
2
2
2
2
2
1
1
Swell
Height Map
Height 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
0.9
ESE
9
0.9
ESE
9
0.8
ESE
9
0.7
ESE
9
0.8
ESE
9
0.8
ESE
9
0.8
ESE
9
0.9
ESE
9
0.9
ESE
9
0.9
ESE
9
0.9
ESE
8
0.8
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
1
ESE
10
Wave Graph
Metric surfscale
Energy kJ
106
108
111
111
92
84
106
106
106
111
106
106
103
76
154
171
146
170
170
166
163
163
160
190
Wind (km/h)
5
SE
5
NNE
5
N
5
NNE
5
NNE
5
S
10
SSE
10
SSE
5
SSE
5
NE
5
NNE
5
NNE
5
NE
5
S
10
S
5
SSE
5
ESE
5
ENE
5
NNE
5
NNE
0
NE
0
ESE
5
SE
10
SE
glassy
cross-off
off
off
off
glassy
on
on
cross-on
glassy
off
glassy
cross-off
on
on
on
glassy
glassy
off
glassy
glassy
glassy
cross-on
cross-on
High Tide
6:51PM1.90m
5:58AM1.88m
7:41PM1.85m
6:39AM1.85m
8:34PM1.77m
7:22AM1.79m
Low Tide
00:25AM0.84m
12:48PM-0.10m
1:09AM0.92m
1:36PM-0.06m
1:54AM1.00m
2:26PM0.05m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
cloud
cloud
light rain
light rain
rain showers
light rain
light rain
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:01
5:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:59
7:00
7:00
7:00
2
1
1
2
2
1
1
Temp °C
22
20
19
18
19
23
24
24
22
20
19
18
18
21
23
22
21
19
20
20
20
21
23
23
24
21
19
17
19
23
24
24
23
22
20
19
19
21
22
23
23
21
22
22
23
24
26
25
Swell 1
Height (m)
Direction
Period (s)
0.9
ESE
9
0.9
ESE
9
0.9
ESE
9
0.9
ESE
9
0.8
ESE
9
0.7
ESE
9
0.8
ESE
9
0.8
ESE
9
0.8
ESE
9
0.9
ESE
9
0.9
ESE
9
0.9
ESE
9
0.9
ESE
8
0.8
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
1.1
SSE
8
1.1
S
8
1.2
S
7
1.3
S
7
Energy kJ
106
108
111
111
92
84
106
106
106
111
106
106
103
76
154
171
146
170
170
166
159
157
159
171
Swell 2
Height (m)
Direction
Period (s)
0.3
SE
12
0.3
SE
11
0.3
SE
12
0.3
SE
12
0.3
SE
12
0.3
SE
12
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
0.6
SSE
6
0.7
SE
6
0.3
S
9
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
1
ESE
10
Energy kJ
24
19
23
23
23
23
23
4
4
21
31
30
30
50
33
25
27
39
15
166
163
163
160
190
Swell 3
Height (m)
Direction
Period (s)
0.1
SE
10
0.1
SE
10
0.1
SE
10
0.1
SE
10
0.1
SE
12
0.1
SE
12
0.3
ESE
10
0.1
S
9
Energy kJ
4
4
4
4
6
6
20
2
Wind waves
Height (m)
Direction
Period (s)
0.2
ESE
2
0.3
SE
3
0.4
ESE
4
0.6
SE
5
0.9
SE
7
1
SSE
8
1.2
SSE
7
Energy kJ
1
1
6
19
63
107
135
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
Distance (km)
0
0
0
0
0
0
523
58
55
0
0
0
0
55
58
58
0
0
0
0
0
0
29
29
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
Best forecast wave conditions in Japan
Rating
(10 max)
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
Header Global
Rating
(10 max)
7
4
8
6
4
4
5
6
5
4
5
4
5
4
4
4
4
4
4
4
4
4
4
4
  • 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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