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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 8 pm Monday 20 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
19.6° C
(Which is slightly warmer than usual)How big are the waves at Niyodo Rivermouth today?
The current surf forecast for Niyodo Rivermouth at 4AM is: 1.7m 12s primary swell from a East-southeast direction and 0.3m 5s secondary swell from a South-southwest direction (forecast issued at 08:00pm April 20). The wind direction is predicted to be cross-offshore and the swell rating is 3.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Apr) | 5ft (1.5m) | 12s |
| Afternoon (21 Apr) | 4.5ft (1.4m) | 11s |
| Evening (21 Apr) | 4.5ft (1.3m) | 11s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||||||||
| 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 | 6 AM | 9 AM | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1342 | 1099 | 1047 | 876 | 737 | 614 | 593 | 513 | 486 | 415 | 338 | 275 | 260 | 212 | 170 | 170 | 164 | 130 | 133 | 130 | 127 | 125 | 96 | 84 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | glass | off | off | off | off | off | off | off | off | off | off | glass | on | on | glass | glass | glass | glass | glass | cross- off | cross- off | glass |
High Tide / height (m) | 8:29PM 1.77 | 7:32AM 1.81 | 9:26PM 1.63 | 8:10AM 1.71 | 10:40PM 1.50 | 8:57AM 1.58 | ||||||||||||||||||
Low Tide / height (m) | 1:55AM 0.90 | 2:29PM 0.10 | 2:38AM 1.04 | 3:24PM 0.24 | 3:33AM 1.15 | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||||||||
| Sunrise | - | - | - | - | 5:28 | - | - | - | - | - | - | - | 5:26 | - | - | - | - | - | - | - | 5:26 | - | - | - |
| Sunset | 6:38 | - | - | - | - | - | - | - | 6:38 | - | - | - | - | - | - | - | 6:39 | - | - | - | - | - | - | - |
 |  | | |  | | |  | |  | | | | |  | | |  | |  |  | |  | | |
Rain (mm) | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 2 | 4 | 9 | 10 |
| Temp. °C | 19 | 18 | 17 | 17 | 17 | 17 | 19 | 21 | 18 | 14 | 13 | 12 | 12 | 17 | 18 | 18 | 17 | 17 | 16 | 14 | 12 | 12 | 12 | 13 |
| Feels °C (?) | 20 | 19 | 18 | 17 | 17 | 13 | 14 | 16 | 14 | 11 | 9 | 8 | 8 | 15 | 16 | 16 | 16 | 16 | 15 | 14 | 12 | 10 | 11 | 13 |
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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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