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Surf Forecasts:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 8 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):
- Evening surf: Evening surf (31 May, local time) - 4ft (1.2m), 12s period with S swell.
The current surf forecast for Niyodo Rivermouth at 11PM is: 0.9m 16s primary swell from a South direction and 1.4m 7s secondary swell from a South-southeast direction, 1.2m 12s secondary swell from a South direction, 1.2m 6s secondary swell from a South-southeast direction (forecast issued at 08:00pm May 31). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 May) | - | - |
| Afternoon (31 May) | - | - |
| 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 109mm), heaviest during Tue night. Warm (max 26°C on Wed afternoon, min 19°C on Mon night). Winds increasing (calm on Sun night, fresh winds from the NE by Tue night). | ||||||||||||||||||||||||
Sun 31 | Monday 1 | Tuesday 2 | Wednesday 3 | |||||||||||||||||||||
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 | 12 PM | 3 PM | |
Swell Height Map |   |    |    |    | ||||||||||||||||||||
S 12 | S 12 | S 16 | S 15 | S 14 | S 14 | S 13 | S 14 | S 14 | S 14 | S 14 | S 14 | S 13 | SSW 13 | SSW 13 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 15 | S 14 | S 13 | SSW 12 | SE 10 | |
488 | 411 | 386 | 559 | 482 | 1196 | 986 | 1733 | 2019 | 2379 | 2293 | 2073 | 2135 | 1605 | 1649 | 1886 | 1987 | 2452 | 5085 | 12013 | 11501 | 6436 | 2815 | 1081 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | glassy | glassy | glassy | on | on | cross-on | cross | glassy | cross-off | cross | cross-off | cross-off | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-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 | 1:35PM0.23m | ||||||||||||||||||
 |  | |  |  | | | |  |  | | |  | | | |  |  | | |  | | | | |
 | — | — | — | 4:56 | — | — | — | — | — | — | — | 4:56 | — | — | — | — | — | — | — | 4:54 | — | — | — | — |
 | 7:08 | — | — | — | — | — | — | — | 7:08 | — | — | — | — | — | — | — | 7:09 | — | — | — | — | — | — | 7:09 |
— | 1 | 1 | — | — | — | — | — | — | — | 3 | 4 | 4 | 5 | 4 | 5 | 9 | 17 | 21 | 32 | 3 | — | — | — | |
Temp °C | 24 | 21 | 20 | 20 | 20 | 22 | 23 | 23 | 22 | 21 | 20 | 19 | 19 | 20 | 20 | 21 | 22 | 22 | 22 | 23 | 22 | 23 | 25 | 26 |
24 | 22 | 21 | 23 | 22 | 24 | 23 | 24 | 23 | 23 | 23 | 21 | 21 | 22 | 21 | 22 | 22 | 21 | 20 | 20 | 20 | 21 | 24 | 27 | |
Swell 1 Height (m) Direction Period (s) | S 12 | S 12 | SSE 7 | SSE 7 | SSE 7 | S 14 | S 13 | S 14 | S 14 | S 14 | S 14 | S 14 | S 13 | SSW 13 | SSW 13 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 15 | S 14 | S 13 | SSW 12 | SE 10 |
 kJ | 488 | 411 | 175 | 163 | 116 | 1196 | 986 | 1733 | 2019 | 2379 | 2293 | 2073 | 2135 | 1605 | 1649 | 1886 | 1987 | 2452 | 4969 | 12013 | 11501 | 6436 | 2815 | 1081 |
Swell 2 Height (m) Direction Period (s) | E 11 | S 16 | S 12 | S 15 | S 14 | SSE 6 | SSW 16 | E 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SE 12 | SE 12 | — | — | — | — | — | SE 11 | ESE 11 | ESE 11 | ESE 11 | SSW 11 |
| kJ | 83 | 245 | 384 | 559 | 482 | 28 | 540 | 53 | 59 | 59 | 58 | 58 | 22 | 23 | — | — | — | — | — | 4206 | 5590 | 3366 | 1843 | 994 |
Swell 3 Height (m) Direction Period (s) | SE 12 | E 11 | S 16 | S 11 | S 11 | ESE 6 | E 10 | E 10 | — | SE 12 | — | — | — | — | — | — | — | — | — | — | — | — | NE 8 | NE 8 |
| kJ | 22 | 85 | 386 | 242 | 231 | 31 | 54 | 74 | — | 21 | — | — | — | — | — | — | — | — | — | — | — | — | 222 | 36 |
Wind waves Height (m) Direction Period (s) | S 4 | SSE 6 | — | — | — | — | — | ESE 5 | — | — | — | E 10 | ESE 10 | ESE 6 | SE 7 | ESE 7 | ESE 8 | ESE 8 | ESE 10 | ENE 10 | NNE 7 | NW 4 | WNW 4 | WNW 4 |
| kJ | 9 | 91 | — | — | — | — | — | 29 | — | — | — | 73 | 32 | 246 | 400 | 653 | 1143 | 2408 | 5085 | 3286 | 456 | 43 | 20 | 17 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 647 | 55 | 51 | 0 | 0 | 82 | 82 | 29 | 29 | 29 | 0 | 0 | 29 | 0 | 380 | 539 | 642 | 432 | 539 | 535 | 224 | 224 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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