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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 8 pm Wednesday 20 May 2026 JSTForecast 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) & Date | Wave Height | Wave 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 ForecastHeavy 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 | |
Swell Height Map |   |    |    |    | ||||||||||||||||||||
ESE 10 | ESE 10 | ESE 10 | ESE 10 | S 6 | S 7 | SSW 7 | S 7 | SSW 7 | SSW 7 | SW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | S 6 | S 6 | E 10 | ESE 6 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | |
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) | ||||||||||||||||||||||||
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 | |||||||||||||||||||
 |  | |  |  | |  | | | | |  |  | | | |  |  | |  | | | | | |
 | — | — | — | 5:01 | — | — | — | — | — | — | — | 5:00 | — | — | — | — | — | — | — | 5:00 | — | — | — | — |
 | 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) | ESE 10 | ESE 10 | S 6 | S 6 | S 6 | S 7 | S 7 | ESE 9 | ESE 9 | ESE 10 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | S 6 | S 6 | SSE 6 | SW 6 | SW 6 | SW 6 | — | — |
 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) | S 7 | SSE 6 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | — | — | — | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 9 | SSW 6 | S 6 | — | — | — | — |
| 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) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 7 | — | SE 8 | SSE 8 | SW 6 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 2 | 6 | 19 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSE 7 | S 6 | — | — | S 6 | S 7 | SSW 7 | S 7 | SSW 7 | SSW 7 | SW 8 | SSW 8 | — | WNW 4 | — | ENE 4 | ENE 4 | — | E 10 | ESE 6 | ESE 7 | ESE 8 | ESE 8 | ESE 8 |
| kJ | 62 | 80 | — | — | 209 | 240 | 293 | 303 | 545 | 516 | 616 | 429 | — | 17 | — | 1 | 2 | — | 148 | 180 | 407 | 784 | 1046 | 1145 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
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 | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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