Surf Forecasts:
Monabe Rivermouth surf forecast from 22 Sep 2026:
- Best quality surf: Monday 28 Sep, 12AM (local time) - 4.5ft (1.3m), 13s period, S swell with glassy winds.
- Most powerful swell: Monday 28 Sep, 12AM (local time) - 4.5ft (1.3m), 13s period, S swell with 547 kJ wave energy.
- Next surfable swell (1★+): Monday 28 Sep, 12AM (local time) - 4.5ft (1.3m), 13s period with S 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 Monday (Sep 28) at 12AM. The primary swell is predicted to be 1.3m and 13s period. 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 1.3m 13s and forecast to arrive on Monday (Sep 28) at 12AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 14s period and expected on Monday (Sep 28) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 28th Sep) | 4.5ft (1.3m) 13s |
| Best Surf | 12AM (Mon 28th Sep) | 4.5ft (1.3m) 13s |
| Most Powerful | 12AM (Mon 28th Sep) | 4.5ft (1.3m) 13s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
Short Range ForecastMostly dry. Warm (max 29°C on Tue morning, min 19°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 26mm), heaviest during Sun morning. Warm (max 26°C on Fri morning, min 21°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | Sunday 27 | Monday 28 | |||||||||||||||
AM | 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) | E 9 | E 9 | ENE 6 | SE 7 | SE 7 | SE 7 | SE 9 | E 10 | E 9 | E 9 | E 9 | E 9 | SSE 11 | SSE 10 | SSE 9 | S 12 | S 11 | S 13 | E 8 | E 9 | SE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 108 | 57 | 34 | 9 | 8 | 8 | 19 | 7 | 7 | 7 | 7 | 15 | 48 | 58 | 47 | 57 | 143 | 547 | 19 | 24 | 14 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | on | off | glassy | on | off | glassy | on | off | glassy | on | cross-off | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy |
High Tide | 4:26PM1.53m | 3:23AM1.49m | 4:45PM1.62m | 4:07AM1.63m | 5:04PM1.71m | 4:46AM1.75m | 5:25PM1.78m | 5:23AM1.84m | 5:48PM1.84m | 6:00AM1.90m | 6:11PM1.87m | 6:38AM1.91m | 6:36PM1.88m | ||||||||
Low Tide | 9:26AM0.53m | 10:02PM1.00m | 10:04AM0.43m | 10:28PM0.84m | 10:36AM0.35m | 10:54PM0.68m | 11:07AM0.31m | 11:22PM0.52m | 11:37AM0.31m | 11:51PM0.37m | 12:07PM0.36m | 00:22AM0.25m | 12:37PM0.45m | 00:55AM0.18m | |||||||
 | |  | | |  | | | | | | |  | |  |  |  |  | |  |  | |
 | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — |
 | — | 6:02 | — | — | 6:00 | — | — | 6:00 | — | — | 5:58 | — | — | 5:57 | — | — | 5:55 | — | — | 5:53 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 12 | 7 | 3 | 4 | 9 | 2 | 5 |
Temp °C | 29 | 28 | 22 | 25 | 25 | 22 | 25 | 26 | 22 | 26 | 25 | 23 | 23 | 25 | 22 | 22 | 23 | 23 | 23 | 23 | 23 |
Feels °C | 29 | 28 | 23 | 25 | 26 | 24 | 26 | 28 | 24 | 27 | 27 | 26 | 25 | 28 | 26 | 26 | 27 | 27 | 28 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | ENE 6 | ENE 4 | SE 7 | SE 7 | SE 9 | SSE 8 | SSE 8 | ENE 4 | ENE 4 | E 9 | SSE 11 | SSE 10 | SSE 9 | SSE 8 | S 11 | S 13 | SSW 14 | SSW 14 | SSW 14 |
| kJ | 108 | 57 | 34 | 4 | 8 | 7 | 19 | 7 | 7 | 2 | 3 | 15 | 48 | 58 | 47 | 57 | 143 | 547 | 1267 | 1208 | 1318 |
Swell 2 Height (m) Direction Period (s) | ENE 4 | ENE 5 | SE 8 | SE 7 | ENE 4 | SSE 9 | E 10 | E 10 | E 9 | E 9 | E 9 | SSE 8 | E 9 | S 7 | E 8 | S 12 | SSW 14 | SSW 16 | E 8 | E 9 | E 9 |
| kJ | 2 | 4 | 17 | 9 | 1 | 8 | 8 | 7 | 6 | 6 | 6 | 7 | 14 | 1 | 12 | 41 | 158 | 277 | 19 | 24 | 13 |
Swell 3 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 7 | S 7 | E 6 | SSE 8 | SSE 8 | E 4 | S 6 | S 13 | S 14 | SSW 14 | E 8 | E 8 | SE 13 | SE 10 | SE 10 |
| kJ | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 7 | 7 | 1 | 1 | 4 | 15 | 41 | 29 | 32 | 7 | 15 | 14 |
Wind waves Height (m) Direction Period (s) | NNW 3 | NE 5 | NE 6 | NE 5 | — | — | E 5 | E 6 | — | NE 4 | NE 4 | — | — | E 8 | E 6 | E 6 | NNE 4 | — | — | — | — |
| kJ | 1 | 29 | 80 | 16 | — | — | 1 | 3 | — | 13 | 8 | — | — | 35 | 26 | 25 | 1 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 9 | 47 | 238 | 910 | 306 | 565 | 565 | 1510 | 346 | 528 | 288 | 9 | 9 | 9 | 9 | 9 | 0 | 9 | 9 | 9 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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