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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 2 am 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
21.8° C
(Which is slightly warmer than usual)How big are the waves at Niyodo Rivermouth today?
The current surf forecast for Niyodo Rivermouth at 6AM is: 0.9m 10s primary swell from a East-southeast direction and 0.6m 7s secondary swell from a South-southeast direction (forecast issued at 02:00am May 20). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 3ft (0.9m) | 10s |
| Afternoon (20 May) | 3.5ft (1.0m) | 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 ForecastHeavy rain (total 23mm), heaviest during Thu morning. Warm (max 25°C on Fri morning, min 20°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
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 | 6 PM | 9 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | S 7 | S 7 | S 7 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | ESE 9 | ESE 10 | |
170 | 166 | 163 | 163 | 212 | 208 | 157 | 186 | 154 | 193 | 232 | 282 | 335 | 531 | 650 | 688 | 753 | 579 | 322 | 214 | 162 | 105 | 78 | 54 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | glassy | glassy | glassy | cross-off | cross | glassy | glassy | glassy | on | on | cross-on | cross-on | cross-on | off | cross-off | cross-off | off | off | cross-on | cross-on | cross | |
High Tide | 7:22AM1.79m | 9:31PM1.67m | 8:11AM1.69m | 10:33PM1.59m | 9:10AM1.57m | |||||||||||||||||||
Low Tide | 1:54AM1.00m | 2:26PM0.05m | 2:46AM1.06m | 3:21PM0.20m | 3:50AM1.09m | 4:23PM0.37m | ||||||||||||||||||
 | |  |  |  | |  |  |  | | | |  | | | | |  | |  | | | | | |
 | — | 5:01 | — | — | — | — | — | — | — | 5:01 | — | — | — | — | — | — | — | 5:00 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 7:00 | — | — | — | — | — | — | — | 7:01 | — | — | — | — | — | — | — | 7:02 | — |
— | — | — | — | 1 | 2 | 1 | 1 | 1 | — | — | 1 | 7 | 5 | 1 | 1 | 1 | — | — | — | — | — | — | 1 | |
Temp °C | 20 | 20 | 20 | 23 | 21 | 22 | 23 | 22 | 22 | 22 | 22 | 23 | 22 | 23 | 23 | 22 | 22 | 21 | 20 | 23 | 25 | 23 | 22 | 21 |
21 | 21 | 21 | 25 | 24 | 26 | 26 | 25 | 25 | 25 | 26 | 26 | 24 | 23 | 25 | 25 | 25 | 23 | 21 | 22 | 25 | 22 | 23 | 23 | |
Swell 1 Height (m) Direction Period (s) | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | S 7 | S 7 | ESE 9 | ESE 9 | ESE 9 | ESE 10 | ESE 10 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 |
 kJ | 170 | 166 | 163 | 163 | 212 | 208 | 157 | 186 | 154 | 193 | 232 | 139 | 139 | 113 | 115 | 81 | 619 | 445 | 322 | 214 | 162 | 105 | 59 | 30 |
Swell 2 Height (m) Direction Period (s) | SSE 7 | SSE 7 | SSE 7 | SSE 7 | S 7 | SSE 7 | SSE 6 | — | — | ESE 10 | ESE 10 | — | — | — | — | — | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 9 | ESE 10 |
| kJ | 25 | 26 | 36 | 41 | 34 | 51 | 61 | — | — | 151 | 145 | — | — | — | — | — | 81 | 81 | 81 | 83 | 81 | 78 | 78 | 54 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSE 6 | SSE 6 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 14 | 23 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | S 6 | S 6 | S 6 | SSW 6 | — | S 7 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | — | WNW 4 | — | — | — | ESE 3 |
| kJ | — | — | — | — | — | — | 101 | 112 | 135 | 118 | — | 282 | 335 | 531 | 650 | 688 | 753 | 579 | — | 22 | — | — | — | 3 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 29 | 0 | 0 | 0 | 51 | 58 | 58 | 58 | 51 | 0 | 0 | 0 | 0 | 0 | 82 | 29 | 29 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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