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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 2 am Thursday 21 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 8AM is: 1.6m 7s primary swell from a South direction and 1.3m 7s secondary swell from a South direction, 0.9m 10s secondary swell from a East-southeast direction (forecast issued at 02:00am May 21). The wind direction is predicted to be glassy and the swell rating is 3.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 May) | 5ft (1.6m) | 7s |
| Afternoon (21 May) | 5ft (1.5m) | 7s |
| Evening (21 May) | 7ft (2.1m) | 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 114mm), heaviest during Sat night. Warm (max 25°C on Fri morning, min 20°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 21 | Friday 22 | Saturday 23 | ||||||||||||||||||||||
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 | S 7 | SSW 7 | S 7 | SSW 7 | SSW 7 | SW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | S 7 | ESE 9 | S 6 | ESE 9 | ESE 6 | ESE 7 | ESE 8 | ESE 8 | E 9 | ESE 9 | ESE 9 | |
154 | 183 | 148 | 236 | 285 | 238 | 489 | 475 | 503 | 268 | 231 | 149 | 99 | 92 | 78 | 51 | 78 | 77 | 203 | 473 | 847 | 1088 | 841 | 878 | |
Wind (km/h) | ||||||||||||||||||||||||
cross | glassy | glassy | glassy | on | glassy | glassy | glassy | glassy | cross-off | off | off | off | cross-on | on | glassy | glassy | cross | cross-on | cross-on | 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 | 5:32PM0.52m | ||||||||||||||||||
 | |  |  |  | |  |  | |  |  | | | |  | |  | | | | | | |  | |
 | — | 5:01 | — | — | — | — | — | — | — | 5:00 | — | — | — | — | — | — | — | 5:00 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 7:01 | — | — | — | — | — | — | — | 7:02 | — | — | — | — | — | — | — | 7:02 | — |
1 | 1 | — | 2 | 8 | 2 | 4 | — | 1 | — | — | — | — | — | — | — | — | 1 | 2 | 2 | 2 | 3 | 7 | 10 | |
Temp °C | 22 | 23 | 22 | 22 | 22 | 22 | 22 | 23 | 22 | 22 | 20 | 24 | 25 | 24 | 23 | 22 | 21 | 21 | 21 | 21 | 22 | 21 | 21 | 21 |
25 | 27 | 26 | 26 | 25 | 26 | 26 | 28 | 25 | 24 | 21 | 23 | 24 | 23 | 24 | 24 | 23 | 22 | 21 | 20 | 21 | 20 | 20 | 20 | |
Swell 1 Height (m) Direction Period (s) | S 6 | S 6 | S 6 | S 7 | S 7 | ESE 9 | ESE 9 | ESE 10 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | S 7 | S 6 | S 6 | S 6 | ESE 10 | S 6 | S 6 | — | E 9 | ESE 9 | — |
 kJ | 73 | 115 | 139 | 176 | 183 | 148 | 110 | 115 | 363 | 268 | 231 | 149 | 99 | 92 | 68 | 51 | 38 | 54 | 18 | 18 | — | 1088 | 841 | — |
Swell 2 Height (m) Direction Period (s) | 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 | ESE 9 | S 6 | SW 6 | — | — | — | — | — |
| kJ | 154 | 183 | 148 | 142 | 136 | — | — | — | 81 | 83 | 81 | 83 | 81 | 71 | 78 | 50 | 78 | 11 | 5 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SSE 8 | — | SSE 7 | S 6 | SW 6 | SW 6 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | — | 5 | 18 | 10 | 6 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | SW 6 | S 7 | SSW 7 | S 7 | SSW 7 | SSW 7 | SW 7 | — | NW 3 | — | — | — | NE 5 | ENE 5 | E 4 | ESE 6 | ESE 7 | ESE 8 | ESE 8 | — | S 6 | ESE 9 |
| kJ | — | — | 83 | 236 | 285 | 238 | 489 | 475 | 503 | — | 2 | — | — | — | 11 | 8 | 17 | 77 | 203 | 473 | 847 | — | 15 | 878 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 29 | 0 | 0 | 0 | 51 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 55 | 61 | 0 | 0 | 29 | 229 | 224 | 330 | 297 | 224 | 224 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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