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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 2 pm 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
23.7° C
(Which is 1.7°C warmer than normal for this time of year)How big are the waves at Niyodo Rivermouth today (31 May):
- Afternoon surf: Afternoon surf (31 May, local time) - 4ft (1.2m), 12s period with S swell.
- Evening surf: Evening surf (31 May, local time) - 4ft (1.2m), 12s period with S swell.
The current surf forecast for Niyodo Rivermouth at 6PM is: 1.3m 12s primary swell from a South direction and 0.6m 11s secondary swell from a East direction, 0.9m 4s secondary swell from a South direction (forecast issued at 02:00pm May 31). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 May) | - | - |
| Afternoon (31 May) | 4ft (1.2m) | 12s |
| Evening (31 May) | 4ft (1.2m) | 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 151mm), heaviest during Tue night. Warm (max 27°C on Sun afternoon, min 19°C on Sun night). Winds increasing (calm on Sun night, fresh winds from the ENE by Tue night). | ||||||||||||||||||||||||
Sun 31 | Monday 1 | Tuesday 2 | Wed 3 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
S 13 | S 12 | S 12 | S 12 | S 16 | S 11 | S 14 | S 14 | S 13 | S 14 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 | SSW 13 | SSW 14 | SSW 14 | ESE 9 | ESE 10 | SSW 15 | S 14 | S 13 | |
398 | 439 | 488 | 411 | 386 | 617 | 482 | 1196 | 986 | 1733 | 1868 | 2187 | 2127 | 1840 | 2171 | 2313 | 1725 | 2167 | 2446 | 2995 | 7020 | 11851 | 12108 | 7950 | |
Wind (km/h) | ||||||||||||||||||||||||
glassy | glassy | on | on | on | glassy | cross-off | on | on | on | cross-on | cross-on | glassy | cross-off | cross | cross-off | cross | cross | cross | cross | cross-off | off | off | off | |
High Tide | 6:40PM1.69m | 5:34AM1.69m | 7:15PM1.68m | 6:07AM1.69m | 7:51PM1.65m | 6:40AM1.68m | ||||||||||||||||||
Low Tide | 00:06AM0.95m | 12:24PM0.17m | 00:38AM0.97m | 12:59PM0.19m | 1:11AM0.98m | |||||||||||||||||||
 |  | |  |  |  | | | |  | | | | |  | |  | | |  | | | | | |
 | — | — | — | — | — | 4:56 | — | — | — | — | — | — | — | 4:56 | — | — | — | — | — | — | — | 4:54 | — | — |
 | — | — | 7:08 | — | — | — | — | — | — | — | 7:08 | — | — | — | — | — | — | — | 7:09 | — | — | — | — | 7:09 |
— | — | — | 1 | 1 | — | — | — | — | — | — | 2 | 4 | 4 | 4 | 4 | 12 | 12 | 11 | 15 | 19 | 48 | 13 | 1 | |
Temp °C | 25 | 27 | 24 | 21 | 20 | 19 | 19 | 22 | 23 | 22 | 22 | 20 | 19 | 19 | 20 | 20 | 21 | 21 | 22 | 22 | 22 | 22 | 23 | 24 |
27 | 27 | 23 | 22 | 21 | 22 | 21 | 23 | 23 | 22 | 23 | 22 | 21 | 21 | 22 | 21 | 22 | 21 | 21 | 19 | 19 | 19 | 19 | 20 | |
Swell 1 Height (m) Direction Period (s) | S 13 | S 12 | S 12 | S 12 | SSE 7 | S 11 | S 11 | S 14 | S 13 | S 14 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 | SSW 13 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 15 | S 14 | S 13 |
 kJ | 398 | 439 | 488 | 411 | 271 | 617 | 396 | 1196 | 986 | 1733 | 1868 | 2187 | 2127 | 1840 | 2171 | 2313 | 1725 | 2167 | 2446 | 2991 | 5220 | 11851 | 12108 | 7950 |
Swell 2 Height (m) Direction Period (s) | ESE 11 | ESE 11 | E 11 | S 16 | S 12 | S 15 | S 14 | ESE 6 | SSW 16 | E 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SE 12 | — | — | S 18 | S 11 | — | — | E 11 | ESE 11 |
| kJ | 91 | 91 | 85 | 245 | 376 | 559 | 482 | 42 | 540 | 53 | 59 | 58 | 58 | 58 | 57 | 23 | — | — | 6 | 319 | — | — | 4826 | 3366 |
Swell 3 Height (m) Direction Period (s) | SSE 9 | SE 9 | SE 12 | E 11 | S 16 | ESE 8 | ESE 7 | E 10 | E 10 | E 10 | — | SE 11 | — | — | — | — | — | — | — | — | — | — | SE 12 | — |
| kJ | 8 | 3 | 22 | 85 | 386 | 91 | 57 | 51 | 77 | 100 | — | 20 | — | — | — | — | — | — | — | — | — | — | 1903 | — |
Wind waves Height (m) Direction Period (s) | — | — | S 4 | SSE 6 | — | — | — | — | ESE 10 | ESE 4 | — | — | — | E 4 | — | ESE 10 | ESE 6 | ESE 7 | ESE 8 | ESE 9 | ESE 10 | ESE 11 | — | NNW 5 |
| kJ | — | — | 27 | 140 | — | — | — | — | 180 | 15 | — | — | — | 14 | — | 31 | 284 | 549 | 1182 | 2995 | 7020 | 10463 | — | 142 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 2304 | 51 | 0 | 0 | 0 | 0 | 82 | 29 | 29 | 29 | 0 | 0 | 0 | 0 | 380 | 432 | 432 | 560 | 535 | 535 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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