Surf Forecasts:
Monabe Rivermouth surf forecast from 20 Oct 2026:
- Best quality surf: Wednesday 21 Oct, 6PM (local time) - 8ft (2.5m), 16s period, SSE swell with offshore winds.
- Most powerful swell: Thursday 22 Oct, 12AM (local time) - 10ft (3.0m), 15s period, SSE swell with 3,741 kJ wave energy.
- Next surfable swell (1★+): Wednesday 21 Oct, 6AM (local time) - 6ft (1.8m), 14s period with SE swell.
Best Forecast Surf Conditions for Monabe Rivermouth this week:
The surf forecast for Monabe Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Oct 21) at 6AM. The primary swell is predicted to be 1.8m and 14s period with a secondary swell of 0.9m and 17s. Another secondary swell of 1.0m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Monabe Rivermouth in the next 16 days are 3.0m 15s and forecast to arrive on Thursday (Oct 22) at 12AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 15s period and expected on Friday (Oct 23) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 21st Oct) | 6ft (1.8m) 14s |
| Best Surf | 6PM (Wed 21st Oct) | 8ft (2.5m) 16s |
| Most Powerful | 12AM (Thu 22nd Oct) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
Short Range ForecastLight rain (total 9mm), mostly falling on Tue night. Warm (max 26°C on Wed morning, min 15°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 36mm), heaviest during Fri night. Warm (max 23°C on Sun morning, min 19°C on Fri afternoon). Wind will be generally light. | |||||||||||||||||||
Tue 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SE 14 | SE 13 | SSE 13 | SSE 16 | SSE 15 | S 14 | S 14 | S 15 | S 14 | S 14 | E 8 | E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 10 | ESE 10 | ESE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1344 | 1050 | 1286 | 3393 | 3741 | 2643 | 1840 | 2648 | 1454 | 2216 | 277 | 565 | 461 | 238 | 166 | 123 | 143 | 214 | 253 | 253 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | on | off | off | glassy | off | glassy | off | off | cross-off | glassy | glassy | glassy | cross-on | off | glassy | glassy | glassy |
High Tide | 1:44AM1.32m | 3:20PM1.52m | 2:53AM1.44m | 3:45PM1.61m | 3:43AM1.58m | 4:09PM1.70m | 4:26AM1.71m | 4:34PM1.78m | 5:07AM1.82m | 5:01PM1.84m | 5:48AM1.89m | 5:29PM1.87m | ||||||||
Low Tide | 8:43PM1.07m | 8:28AM0.64m | 9:18PM0.90m | 9:14AM0.57m | 9:48PM0.71m | 9:53AM0.53m | 10:18PM0.52m | 10:29AM0.51m | 10:49PM0.34m | 11:05AM0.53m | 11:22PM0.17m | 11:40AM0.58m | 11:57PM0.05m | |||||||
 |  |  |  |  |  | | |  |  |  | | |  | | |  | | | | |
 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 5:25 | — | — | 5:24 | — | — | 5:23 | — | — | 5:22 | — | — | 5:21 | — | — | 5:20 | — | — | 5:19 | — |
mm | 2 | 6 | — | 1 | — | — | — | — | — | 1 | 31 | 2 | 1 | 1 | — | — | — | — | — | — |
Temp °C | 25 | 24 | 26 | 26 | 21 | 21 | 22 | 16 | 19 | 19 | 21 | 21 | 21 | 20 | 23 | 23 | 22 | 22 | 22 | 21 |
Feels °C | 28 | 27 | 29 | 28 | 21 | 19 | 21 | 14 | 19 | 20 | 22 | 23 | 24 | 22 | 25 | 25 | 25 | 25 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SE 14 | SE 13 | SSE 13 | SSE 16 | SSE 15 | S 14 | S 14 | S 15 | S 14 | S 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 12 | SSW 12 | SSW 11 | ESE 10 | ESE 10 | ESE 9 |
| kJ | 1344 | 1050 | 1286 | 3393 | 3741 | 2643 | 1840 | 2648 | 1454 | 2216 | 3204 | 3371 | 2441 | 1487 | 703 | 488 | 245 | 214 | 253 | 253 |
Swell 2 Height (m) Direction Period (s) | SSE 20 | SSE 17 | SSE 17 | ESE 10 | WSW 5 | ESE 9 | S 18 | ESE 10 | SSW 16 | — | E 9 | E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SSW 10 | SSW 9 | SSW 9 |
| kJ | 75 | 642 | 1045 | 71 | 31 | 110 | 1033 | 61 | 844 | — | 146 | 565 | 461 | 238 | 166 | 123 | 143 | 140 | 78 | 46 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | ESE 9 | ESE 9 | ESE 10 | ESE 10 | — | ESE 9 | — | — | — | — | NE 4 | NE 4 | — | E 9 | — |
| kJ | — | — | — | — | — | 75 | 73 | 81 | 157 | — | 148 | — | — | — | — | 4 | 1 | — | 56 | — |
Wind waves Height (m) Direction Period (s) | — | SSW 4 | SW 5 | SW 5 | WNW 4 | NE 6 | NE 6 | ENE 6 | NE 5 | E 9 | E 8 | — | — | — | — | — | — | NE 4 | NE 4 | — |
| kJ | — | 24 | 58 | 51 | 37 | 112 | 79 | 91 | 35 | 349 | 277 | — | — | — | — | — | — | 20 | 9 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 42 | 42 | 42 | 42 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 9 | 9 | 0 | 0 | 0 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Monabe Rivermouth surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Monabe Rivermouth Surf forecast
The above surf forecast table for Monabe Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Monabe Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Monabe Rivermouth surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Monabe Rivermouth) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Monabe Rivermouth may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Monabe Rivermouth is 11 km (7 miles) from the city of Aki. If you plan a holiday in Shikoku, look for hotels and other accommodation in Aki. Aki has rooms for a wide range of budgets as well as car hire and transport links.
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