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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 2 pm Saturday 18 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 9PM is: 2.3m 15s primary swell from a Southeast direction and 0.2m 12s secondary swell from a East direction (forecast issued at 02:00pm April 18). The wind direction is predicted to be glassy and the swell rating is 4.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Apr) | - | - |
| Afternoon (18 Apr) | 8ft (2.5m) | 16s |
| Evening (18 Apr) | 7.5ft (2.3m) | 15s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||||||||
| 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 | 6 AM | 9 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 2513 | 3092 | 2584 | 2309 | 2140 | 1956 | 1929 | 1812 | 1787 | 1785 | 1949 | 1922 | 1950 | 2064 | 1973 | 1672 | 1575 | 1363 | 1170 | 1152 | 949 | 920 | 852 | 718 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- on | glass | glass | glass | off | cross- off | cross- on | glass | on | glass | glass | glass | cross- off | cross- off | cross- on | on | on | glass | glass | glass | off | cross- off | off |
High Tide / height (m) | 6:52PM 1.94 | 6:26AM 1.90 | 7:39PM 1.88 | 6:58AM 1.87 | 8:29PM 1.77 | 7:32AM 1.81 | ||||||||||||||||||
Low Tide / height (m) | 12:40AM 0.62 | 1:01PM -0.01 | 1:17AM 0.76 | 1:43PM 0.01 | 1:55AM 0.90 | |||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 5:31 | - | - | - | - | - | - | - | 5:30 | - | - | - | - | - | - | - | 5:28 | - |
| Sunset | - | - | 6:37 | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:38 | - | - | - | - | - |
 |  | |  | | | | | | | | |  | | | |  |  | |  | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - | - | - | - | - | - |
| Temp. °C | 20 | 19 | 18 | 18 | 17 | 16 | 16 | 18 | 19 | 18 | 17 | 17 | 17 | 17 | 17 | 19 | 20 | 20 | 19 | 17 | 17 | 17 | 17 | 19 |
| Feels °C (?) | 20 | 19 | 19 | 19 | 18 | 16 | 16 | 18 | 19 | 18 | 18 | 18 | 17 | 17 | 16 | 18 | 18 | 19 | 20 | 18 | 18 | 17 | 16 | 15 |
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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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