Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 2 pm Sunday 31 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
23.7° C
(Which is 1.7°C warmer than normal for this time of year)

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

  • 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 6PM is: 1.3m 12s primary swell from a South direction and 0.6m 11s secondary swell from a East direction, 0.9m 4s secondary swell from a South direction (forecast issued at 02:00pm May 31). The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (31 May)--
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 151mm), heaviest during Tue night. Warm (max 27°C on Sun afternoon, min 19°C on Sun night). Winds increasing (calm on Sun night, fresh winds from the ENE by Tue night).

Sun
31
Monday
1
Tuesday
2
Wed
3
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
3
0
1
3
4
3
3
2
3
3
3
4
4
3
4
3
2
2
!
!
!
!
!
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)
1.1
S
13
1.2
S
12
1.3
S
12
1.2
S
12
0.9
S
16
1.6
S
11
1.1
S
14
1.8
S
14
1.7
S
13
2.2
S
14
2.2
S
14
2.3
S
14
2.3
S
14
2.2
S
14
2.5
S
13
2.5
S
13
2.2
SSW
13
2.3
SSW
14
2.5
SSW
14
4.5
ESE
9
6
ESE
10
5.5
SSW
15
5.5
S
14
5
S
13
Wave Graph
Metric surfscale
Energy kJ
398
439
488
411
386
617
482
1196
986
1733
1868
2187
2127
1840
2171
2313
1725
2167
2446
2995
7020
11851
12108
7950
Wind (km/h)
0
S
5
WNW
20
S
10
S
10
SSW
0
N
5
NNE
5
SSE
10
S
10
SSE
10
SE
5
SE
5
NE
5
ENE
10
E
10
ENE
15
E
20
E
30
E
35
E
40
ENE
35
NNE
35
N
35
NNW
glassy
glassy
on
on
on
glassy
cross-off
on
on
on
cross-on
cross-on
glassy
cross-off
cross
cross-off
cross
cross
cross
cross
cross-off
off
off
off
High Tide
6:40PM1.69m
5:34AM1.69m
7:15PM1.68m
6:07AM1.69m
7:51PM1.65m
6:40AM1.68m
Low Tide
00:06AM0.95m
12:24PM0.17m
00:38AM0.97m
12:59PM0.19m
1:11AM0.98m
cloud
clear
clear
light rain
rain showers
clear
clear
clear
clear
part cloud
cloud
light rain
light rain
light rain
light rain
light rain
heavy rain
heavy rain
heavy rain
heavy rain
heavy rain
heavy rain
heavy rain
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:56
4:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:08
7:08
7:09
7:09
1
1
2
4
4
4
4
12
12
11
15
19
48
13
1
Temp °C
25
27
24
21
20
19
19
22
23
22
22
20
19
19
20
20
21
21
22
22
22
22
23
24
27
27
23
22
21
22
21
23
23
22
23
22
21
21
22
21
22
21
21
19
19
19
19
20
Swell 1
Height (m)
Direction
Period (s)
1.1
S
13
1.2
S
12
1.3
S
12
1.2
S
12
1.7
SSE
7
1.6
S
11
1.3
S
11
1.8
S
14
1.7
S
13
2.2
S
14
2.2
S
14
2.3
S
14
2.3
S
14
2.2
S
14
2.5
S
13
2.5
S
13
2.2
SSW
13
2.3
SSW
14
2.5
SSW
14
2.5
SSW
14
3.5
SSW
15
5.5
SSW
15
5.5
S
14
5
S
13
Energy kJ
398
439
488
411
271
617
396
1196
986
1733
1868
2187
2127
1840
2171
2313
1725
2167
2446
2991
5220
11851
12108
7950
Swell 2
Height (m)
Direction
Period (s)
0.6
ESE
11
0.6
ESE
11
0.6
E
11
0.7
S
16
1.2
S
12
1.1
S
15
1.1
S
14
0.8
ESE
6
1
SSW
16
0.5
E
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.3
SE
12
0.1
S
18
1.2
S
11
4.5
E
11
4
ESE
11
Energy kJ
91
91
85
245
376
559
482
42
540
53
59
58
58
58
57
23
6
319
4826
3366
Swell 3
Height (m)
Direction
Period (s)
0.2
SSE
9
0.1
SE
9
0.3
SE
12
0.6
E
11
0.9
S
16
0.9
ESE
8
0.8
ESE
7
0.5
E
10
0.6
E
10
0.7
E
10
0.3
SE
11
2.5
SE
12
Energy kJ
8
3
22
85
386
91
57
51
77
100
20
1903
Wind waves
Height (m)
Direction
Period (s)
0.9
S
4
1.5
SSE
6
0.9
ESE
10
0.6
ESE
4
0.7
E
4
0.4
ESE
10
2
ESE
6
2.5
ESE
7
3
ESE
8
4.5
ESE
9
6
ESE
10
6.5
ESE
11
1.7
NNW
5
Energy kJ
27
140
180
15
14
31
284
549
1182
2995
7020
10463
142
Nearest Offshore or Glassy
Rating
(10 max)
2
2
2
3
2
3
3
3
4
4
3
4
4
4
4
4
4
4
2
4
4
1
1
1
Distance (km)
0
0
0
0
2304
51
0
0
0
0
82
29
29
29
0
0
0
0
380
432
432
560
535
535
Best forecast wave conditions in Shikoku
Rating
(10 max)
2
2
2
3
3
3
3
4
4
3
4
4
4
4
4
4
4
Best forecast wave conditions in Japan
Rating
(10 max)
2
2
2
3
4
3
3
4
4
4
4
4
4
4
4
4
4
2
4
4
3
1
2
Header Global
Rating
(10 max)
7
7
7
7
7
6
5
5
5
5
5
5
5
4
5
9
5
5
5
8
5
6
4
5
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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