Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 8 pm Saturday 30 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
23.1° C
(Which is 1.1°C warmer than normal for this time of year)

How big are the waves at Niyodo Rivermouth today (31 May):

  • Morning surf: Morning surf (31 May, local time) - 3ft (0.9m), 14s period with S swell.
  • Afternoon surf: Afternoon surf (31 May, local time) - 4ft (1.2m), 12s period with S swell.
  • Evening surf: Evening surf (31 May, local time) - 4ft (1.2m), 12s period with S swell.

The current surf forecast for Niyodo Rivermouth at 12AM is: 0.6m 11s primary swell from a East direction and 0.3m 5s secondary swell from a South-southeast direction (forecast issued at 08:00pm May 30). The wind direction is predicted to be offshore.

Time (JST) & DateWave HeightWave Period
Morning (31 May)3ft (0.9m)14s
Afternoon (31 May)4ft (1.2m)12s
Evening (31 May)4ft (1.2m)12s

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 37mm), heaviest during Tue morning. Warm (max 25°C on Sun morning, min 19°C on Sun night). Wind will be generally light.

Sat
30
Sunday
31
Monday
1
Tuesday
2
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
2
2
2
3
2
2
2
2
3
3
4
2
3
3
3
3
4
3
4
4
2
Swell
Height Map
Height MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.6
E
11
0.6
E
11
0.6
E
11
0.5
S
16
0.7
S
14
0.9
S
14
1.1
S
13
1.2
S
12
1.4
S
12
1.2
S
12
0.9
S
16
1.2
S
15
1.1
S
14
2
S
14
1.8
S
13
2
S
13
2.1
S
13
2
S
14
2.3
S
14
2.3
S
14
2.4
S
14
2.2
SSW
14
2.2
SSW
14
2.2
SSW
14
Wave Graph
Metric surfscale
Energy kJ
89
88
88
124
203
293
398
439
565
411
386
648
482
1476
1155
1370
1533
1519
2155
2155
2308
1755
1777
1683
Wind (km/h)
5
S
5
NNE
5
N
5
NNW
5
N
0
S
0
SSW
5
S
5
SSW
10
S
5
SSW
0
SW
5
NNE
5
SSE
10
S
10
SSE
5
SE
5
ESE
10
ESE
5
ENE
5
E
5
NE
5
ENE
15
E
glassy
glassy
off
glassy
off
glassy
glassy
on
cross-on
on
cross-on
glassy
glassy
glassy
on
on
cross-on
cross
cross-on
cross-off
cross
glassy
cross-off
cross
High Tide
6:04PM1.68m
5:02AM1.68m
6:40PM1.69m
5:34AM1.69m
7:15PM1.68m
6:07AM1.69m
Low Tide
11:33PM0.93m
11:50AM0.19m
00:06AM0.95m
12:24PM0.17m
00:38AM0.97m
12:59PM0.19m
cloud
cloud
cloud
cloud
cloud
cloud
cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
cloud
light rain
light rain
light rain
light rain
light rain
mod rain
mod rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:56
4:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:07
7:08
7:08
7:09
1
4
4
2
3
8
8
Temp °C
24
22
21
21
21
24
25
25
24
21
20
20
19
22
23
23
22
21
19
19
19
19
19
21
26
24
22
22
22
26
27
26
25
22
22
23
21
24
23
24
24
23
20
21
21
21
21
21
Swell 1
Height (m)
Direction
Period (s)
0.6
E
11
0.6
E
11
0.6
E
11
0.7
ESE
11
0.7
S
14
0.9
S
14
1.1
S
13
1.2
S
12
1.4
S
12
1.2
S
12
1.2
SSE
6
1.2
S
15
1.1
S
14
2
S
14
1.8
S
13
2
S
13
2.1
S
13
2
S
14
2.3
S
14
2.3
S
14
2.4
S
14
2.2
SSW
14
2.2
SSW
14
2.2
SSW
14
Energy kJ
89
88
88
105
203
293
398
439
565
411
103
648
482
1476
1155
1370
1533
1519
2155
2155
2308
1755
1777
1683
Swell 2
Height (m)
Direction
Period (s)
0.3
SSE
5
0.3
SSE
5
0.3
SSE
5
0.5
S
16
0.8
ESE
11
0.8
ESE
11
0.8
ESE
11
0.6
ESE
11
0.6
E
11
0.7
S
16
1.2
S
12
1.2
SSE
6
1.1
SE
6
0.5
E
10
0.8
SE
6
0.5
E
10
0.5
E
10
0.8
SSW
17
0.5
ESE
10
0.5
ESE
10
0.4
E
10
0.3
SE
12
0.3
SE
12
Energy kJ
6
5
5
124
135
135
133
91
85
245
384
110
91
50
42
50
49
336
58
58
30
23
23
Swell 3
Height (m)
Direction
Period (s)
0.1
SE
9
0.3
SE
7
0.2
S
16
0.1
SE
9
0.3
SSE
9
0.2
SSE
9
0.2
SSE
9
0.1
SE
9
0.3
SE
12
0.6
E
11
0.9
S
16
1
S
11
1
S
11
0.3
SE
11
0.5
E
10
0.3
SE
11
0.3
SE
11
0.5
ESE
10
0.3
SE
11
0.3
SE
12
Energy kJ
3
7
20
3
15
8
8
3
22
85
386
238
231
19
54
19
19
58
20
22
Wind waves
Height (m)
Direction
Period (s)
0.9
SSE
5
0.5
E
6
1.1
ESE
5
1.4
SE
6
1.7
SE
6
Energy kJ
37
19
52
128
195
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
2
2
2
3
3
3
3
3
3
3
4
3
4
4
4
4
4
4
4
4
4
Distance (km)
0
0
0
0
0
0
0
51
51
51
51
0
0
0
58
58
29
29
29
0
29
0
0
497
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
1
1
2
2
2
3
3
3
3
3
3
3
4
3
4
4
4
4
4
4
4
4
Best forecast wave conditions in Japan
Rating
(10 max)
1
1
1
2
2
2
3
3
3
3
3
3
3
4
3
4
4
4
4
4
4
4
4
4
Header Global
Rating
(10 max)
5
5
6
8
7
7
7
7
7
6
5
5
5
5
5
5
5
4
5
5
5
5
5
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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