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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 2 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 8PM is: 1.0m 10s primary swell from a East-southeast direction and 1.0m 6s secondary swell from a South direction (forecast issued at 02:00pm May 20). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | - | - |
| Afternoon (20 May) | 3.5ft (1.1m) | 10s |
| Evening (20 May) | 3.5ft (1.0m) | 10s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 13mm), heaviest on Sat morning. Warm (max 25°C on Fri morning, min 20°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Wed 20 | Thursday 21 | Friday 22 | Sat 23 | |||||||||||||||||||||
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 | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SSW 7 | S 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | S 7 | SSW 7 | ESE 10 | E 10 | ESE 6 | ESE 7 | |
212 | 245 | 186 | 186 | 186 | 151 | 148 | 285 | 298 | 545 | 627 | 688 | 627 | 636 | 288 | 203 | 132 | 99 | 94 | 60 | 52 | 190 | 165 | 293 | |
Wind (km/h) | ||||||||||||||||||||||||
glassy | glassy | glassy | cross-off | cross-off | glassy | glassy | on | on | cross-on | cross-on | cross-on | off | cross-off | cross-off | off | off | cross-on | cross-on | glassy | cross-off | glassy | cross-on | cross-on | |
High Tide | 9:31PM1.67m | 8:11AM1.69m | 10:33PM1.59m | 9:10AM1.57m | 11:39PM1.53m | |||||||||||||||||||
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 | 2 | 1 | — | 1 | — | — | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | |
Temp °C | 23 | 22 | 22 | 23 | 22 | 22 | 22 | 23 | 22 | 23 | 23 | 23 | 22 | 21 | 20 | 23 | 25 | 24 | 23 | 21 | 20 | 20 | 20 | 21 |
26 | 26 | 25 | 26 | 25 | 25 | 25 | 26 | 25 | 24 | 26 | 27 | 25 | 23 | 21 | 22 | 24 | 25 | 24 | 23 | 21 | 22 | 21 | 20 | |
Swell 1 Height (m) Direction Period (s) | ESE 10 | ESE 10 | ESE 10 | S 6 | S 6 | S 6 | S 6 | S 7 | ESE 9 | ESE 9 | ESE 10 | ESE 10 | ESE 10 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | S 7 | SSW 7 | ESE 10 | S 6 | S 6 | S 6 |
 kJ | 212 | 245 | 186 | 69 | 88 | 109 | 141 | 210 | 136 | 136 | 115 | 81 | 81 | 414 | 288 | 203 | 132 | 99 | 94 | 60 | 52 | 19 | 7 | 7 |
Swell 2 Height (m) Direction Period (s) | SSE 7 | S 7 | SSE 7 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | — | — | — | — | — | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 9 | SSE 6 | SW 6 | SW 6 | SSW 6 |
| kJ | 36 | 34 | 51 | 186 | 186 | 151 | 148 | 142 | — | — | — | — | — | 83 | 81 | 83 | 83 | 80 | 50 | 50 | 23 | 10 | 10 | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 4 | — | NE 4 | SW 7 | SE 7 | SSE 7 | SE 7 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | 21 | 8 | 5 | 2 |
Wind waves Height (m) Direction Period (s) | — | — | S 6 | — | — | — | SSW 6 | SSW 7 | S 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SW 8 | — | WNW 4 | NNW 4 | — | — | SE 3 | SE 4 | E 10 | ESE 6 | ESE 7 |
| kJ | — | — | 66 | — | — | — | 103 | 285 | 298 | 545 | 627 | 688 | 627 | 636 | — | 13 | 1 | — | — | 2 | 10 | 190 | 165 | 293 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 51 | 58 | 58 | 58 | 51 | 0 | 0 | 0 | 0 | 0 | 55 | 61 | 0 | 0 | 0 | 229 | 229 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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