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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 8 am Wednesday 15 Apr 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
19.5° C
(Which is slightly warmer than usual)How big are the waves at Niyodo Rivermouth today?
The current surf forecast for Niyodo Rivermouth at 12PM is: 1.3m 17s primary swell from a Southeast direction and 1.4m 12s secondary swell from a Southeast direction, 1.1m 5s secondary swell from a Southeast direction (forecast issued at 08:00am April 15). The wind direction is predicted to be glassy and the swell rating is 4.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Apr) | 3.5ft (1.1m) | 18s |
| Afternoon (15 Apr) | 7ft (2.1m) | 16s |
| Evening (15 Apr) | 7.5ft (2.3m) | 16s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 15 | Thursday 16 | Friday 17 | Sat 18 | |||||||||||||||||||||
| 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 12 | 18 | 17 | 16 | 16 | 16 | 16 | 16 | 15 | 14 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 379 | 679 | 951 | 2344 | 2602 | 2538 | 2506 | 2443 | 2169 | 1484 | 2295 | 2175 | 2039 | 1808 | 1808 | 1833 | 1808 | 1808 | 1563 | 1466 | 1486 | 1650 | 1672 | 1836 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | glass | off | off | off | cross- off | cross- off | off | off | off | glass | glass | off | off | cross- off | off | glass | glass | cross- on | cross- on | cross- off | cross- off | cross- off |
High Tide / height (m) | ||||||||||||||||||||||||
Low Tide / height (m) | ||||||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Sat 18 | |||||||||||||||||||||
| Sunrise | 5:35 | - | - | - | - | - | - | - | 5:33 | - | - | - | - | - | - | - | 5:33 | - | - | - | - | - | - | - |
| Sunset | - | - | - | - | 6:35 | - | - | - | - | - | - | - | 6:36 | - | - | - | - | - | - | - | 6:36 | - | - | - |
 |  |  |  | |  |  | |  | | | | | | | | | | | | |  | | | |
Rain (mm) | - | 2 | 8 | 19 | 5 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 17 | 17 | 17 | 17 | 18 | 17 | 16 | 17 | 16 | 18 | 21 | 22 | 18 | 14 | 13 | 13 | 15 | 17 | 16 | 18 | 17 | 16 | 15 | 15 |
| Feels °C (?) | 18 | 18 | 18 | 18 | 19 | 17 | 15 | 16 | 13 | 15 | 17 | 20 | 18 | 12 | 10 | 11 | 14 | 16 | 17 | 16 | 15 | 15 | 14 | 14 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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