Surf Forecasts:
Monabe Rivermouth surf forecast from 17 Sep 2026:
- Best quality surf: Saturday 19 Sep, 6PM (local time) - 11ft (3.5m), 14s period, ESE swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 12PM (local time) - 11ft (3.5m), 16s period, ESE swell with 5,735 kJ wave energy.
- Next surfable swell (1★+): Friday 18 Sep, 9AM (local time) - 8ft (2.5m), 9s period with E 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 Friday (Sep 18) at 9AM. The primary swell is predicted to be 2.5m and 9s period with a secondary swell of 0.1m and 11s. 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 3.5m 16s and forecast to arrive on Saturday (Sep 19) at 12PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Sunday (Sep 20) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Fri 18th Sep) | 8ft (2.5m) 9s |
| Best Surf | 6PM (Sat 19th Sep) | 11ft (3.5m) 14s |
| Most Powerful | 12PM (Sat 19th Sep) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat afternoon. Warm (max 30°C on Sun morning, min 22°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Mon morning, min 19°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | |||||||||||||||
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 | E 10 | E 10 | ESE 15 | ESE 13 | ESE 12 | ESE 13 | ESE 13 | ESE 13 | ESE 12 | E 11 | E 10 | E 9 | E 9 | ESE 8 | ESE 8 | E 7 | E 7 | E 7 | E 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1041 | 1215 | 885 | 1301 | 5220 | 3688 | 2860 | 4033 | 4193 | 3280 | 1505 | 286 | 125 | 61 | 24 | 6 | 6 | 50 | 61 | 43 | 28 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross-off | glassy | cross-on | off | off | off | cross-off | cross-off | off | off | off | on | off | glassy | on | off | glassy | on | off |
High Tide | 10:36AM1.27m | 8:52PM1.49m | 9:22PM1.39m | 4:06PM1.33m | 00:05AM1.30m | 4:10PM1.43m | 2:22AM1.37m | 4:26PM1.53m | 3:23AM1.49m | 4:45PM1.62m | 4:07AM1.63m | 5:04PM1.71m | |||||||||
Low Tide | 2:51PM1.11m | 4:47AM0.66m | 6:47AM0.71m | 8:43PM1.27m | 8:31AM0.64m | 9:35PM1.14m | 9:26AM0.53m | 10:02PM1.00m | 10:04AM0.43m | 10:28PM0.84m | 10:36AM0.35m | 10:54PM0.68m | |||||||||
 |  |  |  |  |  | | |  | | | | | | | | | | | | | |
 | 5:48 | — | — | 5:50 | — | — | 5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — |
 | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:04 | — | — | 6:02 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 24 | 28 | 27 | 24 | 30 | 29 | 24 | 27 | 27 | 21 | 27 | 25 | 22 | 25 | 25 | 22 | 26 | 26 | 23 |
Feels °C | 28 | 28 | 27 | 30 | 30 | 27 | 30 | 28 | 23 | 25 | 24 | 19 | 27 | 25 | 23 | 26 | 27 | 25 | 27 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 10 | S 10 | E 10 | ESE 15 | ESE 13 | ESE 12 | ESE 13 | ESE 13 | ESE 13 | ESE 12 | E 11 | E 10 | E 9 | ENE 6 | ENE 5 | ENE 4 | E 7 | E 7 | E 7 | E 6 |
| kJ | 2 | 2 | 7 | 861 | 5220 | 3688 | 2860 | 4033 | 4193 | 3280 | 1505 | 286 | 125 | 61 | 14 | 4 | 1 | 50 | 61 | 43 | 28 |
Swell 2 Height (m) Direction Period (s) | — | — | SE 16 | ESE 13 | — | S 8 | SSW 9 | — | — | — | S 9 | NE 5 | SE 10 | ENE 6 | E 9 | ESE 8 | ESE 8 | S 8 | SSE 9 | SSE 8 | SSE 8 |
| kJ | — | — | 10 | 756 | — | 6 | 7 | — | — | — | 6 | 6 | 16 | 7 | 24 | 6 | 6 | 4 | 8 | 7 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | SE 17 | — | — | — | — | — | — | WSW 9 | S 8 | S 8 | SSE 10 | S 8 | S 8 | S 8 | SSE 9 | SSW 7 | S 7 | S 7 |
| kJ | — | — | — | 695 | — | — | — | — | — | — | 7 | 6 | 5 | 9 | 5 | 5 | 5 | 8 | 5 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | E 9 | E 9 | E 10 | E 10 | — | — | — | — | — | NW 4 | NW 3 | NNW 4 | — | — | NE 6 | NE 5 | — | — | — | — | — |
| kJ | 1041 | 1215 | 885 | 1301 | — | — | — | — | — | 17 | 5 | 5 | — | — | 56 | 15 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 20 | 0 | 0 | 20 | 0 | 0 | 0 | 42 | 42 | 0 | 0 | 9 | 42 | 47 | 235 | 337 | 9 | 9 | 432 | 238 |
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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