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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 2 pm Monday 18 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
21.6° C
(Which is slightly warmer than usual)How big are the waves at Niyodo Rivermouth today?
The current surf forecast for Niyodo Rivermouth at 9PM is: 0.9m 9s primary swell from a East-southeast direction and 0.3m 12s secondary swell from a Southeast direction (forecast issued at 02:00pm May 18). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | - | - |
| Afternoon (18 May) | 3ft (0.9m) | 9s |
| Evening (18 May) | 3ft (0.9m) | 9s |
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 40mm), heaviest during Wed morning. Warm (max 24°C on Mon afternoon, min 18°C on Mon night). Wind will be generally light. | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
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 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SSW 6 | |
113 | 113 | 106 | 111 | 99 | 106 | 103 | 70 | 154 | 154 | 175 | 170 | 170 | 166 | 163 | 163 | 160 | 157 | 190 | 186 | 154 | 151 | 148 | 188 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | glassy | cross-off | cross-off | cross-off | cross-off | glassy | on | on | cross-on | glassy | off | cross-off | glassy | glassy | glassy | cross-off | cross-off | glassy | glassy | cross | glassy | on | |
High Tide | 7:41PM1.85m | 6:39AM1.85m | 8:34PM1.77m | 7:22AM1.79m | 9:31PM1.67m | 8:11AM1.69m | ||||||||||||||||||
Low Tide | 1:09AM0.92m | 1:36PM-0.06m | 1:54AM1.00m | 2:26PM0.05m | 2:46AM1.06m | |||||||||||||||||||
 | | |  | | | | | | | | |  |  |  |  |  |  | | |  | | |  | |
 | — | — | — | — | — | 5:01 | — | — | — | — | — | — | — | 5:01 | — | — | — | — | — | — | — | 5:01 | — | — |
 | — | — | 7:00 | — | — | — | — | — | — | — | 7:00 | — | — | — | — | — | — | — | 7:00 | — | — | — | — | 7:01 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 13 | 6 | 1 | — | 1 | — | 1 | 7 | |
Temp °C | 25 | 24 | 23 | 20 | 19 | 18 | 18 | 22 | 23 | 23 | 22 | 19 | 19 | 20 | 20 | 22 | 21 | 21 | 23 | 22 | 22 | 22 | 22 | 22 |
24 | 24 | 25 | 21 | 20 | 19 | 19 | 22 | 22 | 22 | 23 | 20 | 19 | 21 | 21 | 24 | 24 | 24 | 26 | 25 | 25 | 25 | 26 | 24 | |
Swell 1 Height (m) Direction Period (s) | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | S 6 | S 6 | S 6 | S 7 | S 6 | S 6 |
 kJ | 113 | 113 | 106 | 111 | 99 | 106 | 103 | 70 | 154 | 154 | 175 | 170 | 170 | 166 | 163 | 163 | 160 | 157 | 104 | 109 | 120 | 124 | 137 | 163 |
Swell 2 Height (m) Direction Period (s) | SE 12 | SE 10 | SE 10 | SE 12 | SE 11 | SE 11 | SE 11 | SE 10 | E 8 | E 9 | — | SSE 7 | SSE 7 | SSE 7 | SSE 7 | SSE 7 | — | S 8 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 |
| kJ | 23 | 4 | 4 | 21 | 31 | 30 | 30 | 50 | 33 | 25 | — | 18 | 27 | 27 | 40 | 40 | — | 10 | 190 | 186 | 154 | 151 | 148 | 145 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 12 | SE 12 | — | — | — | ESE 10 | — | — | — | — | — | — | — | — | — | — | — | S 7 | — | — | — | — | — |
| kJ | 4 | 6 | 6 | — | — | — | 20 | — | — | — | — | — | — | — | — | — | — | — | 8 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | ESE 2 | — | SE 4 | — | — | — | — | — | — | — | — | — | — | SSE 6 | SSE 6 | SSE 6 | — | — | — | — | — | SSW 6 |
| kJ | — | — | 1 | — | 3 | — | — | — | — | — | — | — | — | — | — | 45 | 45 | 69 | — | — | — | — | — | 188 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 645 | 58 | 0 | 0 | 0 | 0 | 0 | 0 | 51 | 51 | 58 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 51 | 0 | 51 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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