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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 2 am Sunday 31 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
23.1° C
(Which is 1.1°C warmer than normal for this time of year)How big are the waves at Niyodo Rivermouth today (31 May):
- Morning surf: Morning surf (31 May, local time) - 3ft (0.9m), 14s period with S swell.
- Afternoon surf: Afternoon surf (31 May, local time) - 4ft (1.2m), 12s period with S swell.
- Evening surf: Evening surf (31 May, local time) - 4.5ft (1.3m), 12s period with S swell.
The current surf forecast for Niyodo Rivermouth at 7AM is: 0.8m 14s primary swell from a South direction and 0.8m 11s secondary swell from a East-southeast direction (forecast issued at 02:00am May 31). The wind direction is predicted to be glassy and the swell rating is 2.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 May) | 3ft (0.9m) | 14s |
| Afternoon (31 May) | 4ft (1.2m) | 12s |
| Evening (31 May) | 4.5ft (1.3m) | 12s |
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 154mm), heaviest during Tue night. Warm (max 26°C on Sun afternoon, min 19°C on Sun night). Winds increasing (calm on Sun morning, near gales from the ENE by Tue night). | ||||||||||||||||||||||||
Sunday 31 | Monday 1 | Tuesday 2 | ||||||||||||||||||||||
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 |    |    |    | |||||||||||||||||||||
E 11 | S 16 | S 14 | S 14 | S 13 | S 12 | S 12 | S 12 | S 16 | S 15 | S 14 | S 14 | S 13 | S 13 | S 14 | S 14 | S 14 | S 14 | S 13 | S 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | |
88 | 124 | 203 | 293 | 398 | 439 | 488 | 480 | 386 | 648 | 482 | 1638 | 1556 | 1553 | 1579 | 1759 | 1894 | 2073 | 2060 | 2299 | 2048 | 2048 | 1733 | 2342 | |
Wind (km/h) | ||||||||||||||||||||||||
off | glassy | glassy | glassy | glassy | glassy | on | on | on | glassy | glassy | glassy | on | on | on | glassy | cross-on | glassy | glassy | cross | cross | cross | cross | cross | |
High Tide | 5:02AM1.68m | 6:40PM1.69m | 5:34AM1.69m | 7:15PM1.68m | 6:07AM1.69m | 7:51PM1.65m | ||||||||||||||||||
Low Tide | 11:33PM0.93m | 11:50AM0.19m | 00:06AM0.95m | 12:24PM0.17m | 00:38AM0.97m | 12:59PM0.19m | ||||||||||||||||||
 | |  | | |  | | |  | | | | |  |  |  |  | | | |  | |  |  | |
 | — | 4:56 | — | — | — | — | — | — | — | 4:56 | — | — | — | — | — | — | — | 4:56 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 7:08 | — | — | — | — | — | — | — | 7:08 | — | — | — | — | — | — | — | 7:09 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 8 | 5 | 5 | 3 | 10 | 9 | 11 | 17 | |
Temp °C | 21 | 21 | 21 | 24 | 24 | 26 | 24 | 21 | 20 | 20 | 19 | 22 | 23 | 23 | 21 | 20 | 19 | 19 | 19 | 20 | 20 | 21 | 21 | 21 |
23 | 23 | 23 | 27 | 25 | 27 | 24 | 23 | 22 | 23 | 21 | 24 | 23 | 23 | 23 | 23 | 21 | 21 | 21 | 21 | 21 | 23 | 20 | 18 | |
Swell 1 Height (m) Direction Period (s) | E 11 | ESE 11 | S 14 | S 14 | S 13 | S 12 | S 12 | S 12 | S 12 | S 15 | SSE 6 | S 14 | S 13 | S 13 | S 14 | S 14 | S 14 | S 14 | S 13 | S 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 |
 kJ | 88 | 105 | 203 | 293 | 398 | 439 | 488 | 480 | 384 | 648 | 109 | 1638 | 1556 | 1553 | 1579 | 1759 | 1894 | 2073 | 2060 | 2299 | 2048 | 2048 | 1733 | 2342 |
Swell 2 Height (m) Direction Period (s) | SSE 5 | S 16 | ESE 11 | ESE 11 | ESE 11 | E 11 | E 11 | S 16 | S 16 | SSE 11 | S 14 | E 10 | ESE 10 | E 10 | E 10 | ESE 10 | ESE 10 | ESE 10 | E 10 | SE 12 | — | — | — | S 10 |
| kJ | 5 | 124 | 135 | 135 | 91 | 85 | 85 | 245 | 386 | 297 | 482 | 55 | 60 | 50 | 53 | 58 | 58 | 58 | 30 | 23 | — | — | — | 31 |
Swell 3 Height (m) Direction Period (s) | S 16 | SE 9 | SSE 9 | SSE 9 | SSE 9 | SE 9 | SE 12 | ESE 11 | E 10 | SSE 5 | S 11 | E 10 | — | SE 11 | E 10 | — | — | SE 11 | SE 12 | SE 12 | — | — | — | — |
| kJ | 20 | 3 | 15 | 8 | 8 | 3 | 22 | 90 | 52 | 42 | 231 | 51 | — | 19 | 52 | — | — | 20 | 22 | 23 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | S 4 | SSE 5 | — | — | — | — | — | — | — | ESE 6 | — | — | ESE 10 | SE 5 | ESE 6 | ESE 7 | ESE 8 |
| kJ | — | — | — | — | — | — | — | 11 | 29 | — | — | — | — | — | — | — | 87 | — | — | 31 | 115 | 295 | 652 | 1692 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 283 | 51 | 51 | 0 | 0 | 0 | 380 | 58 | 58 | 0 | 29 | 0 | 0 | 29 | 29 | 432 | 432 | 432 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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