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Surf Forecasts:
Monabe Rivermouth surfForecast / Shikoku / Japan
16 Day Weather and Surf, issued 8 pm Friday 17 Apr 2026 JSTForecast update in hr min s Forecast update imminent
Monabe Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Monabe Rivermouth sea temperature is
19.5° C
(Which is slightly warmer than usual)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 Saturday (Apr 18) at 6AM. The primary swell is predicted to be 2.3m and 16s period with a secondary swell of 1.5m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Monabe Rivermouth in the next 16 days are 2.5m 16s and forecast to arrive on Saturday (Apr 18) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 7s period and expected on Saturday (Apr 25) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sat 18th Apr) | 7.5ft (2.3m) 16s |
| Best Surf | 6AM (Sat 18th Apr) | 7.5ft (2.3m) 16s |
| Most Powerful | 3PM (Sat 18th Apr) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Light rain (total 5mm), mostly falling on Mon afternoon. Warm (max 20°C on Sun afternoon, min 16°C on Fri night). Wind will be generally light. | Days 3-6 Weather Summary Heavy rain (total 60mm), heaviest during Wed night. Warm (max 22°C on Tue morning, min 13°C on Tue night). Wind will be generally light. | |||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Fri 24 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 16 | 16 | 16 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 8 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 2357 | 2545 | 2925 | 2140 | 1812 | 1785 | 2483 | 1567 | 1151 | 1514 | 933 | 940 | 519 | 351 | 297 | 184 | 227 | 218 | 250 | 173 | 117 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- on | cross- on | off | glass | glass | cross- off | glass | cross- on | off | cross- off | cross- on | off | glass | on | cross | cross- off | glass | off | off | glass | |
High Tide / height (m) | 5:56AM 1.90 | 6:52PM 1.94 | 6:26AM 1.90 | 7:39PM 1.88 | 6:58AM 1.87 | 8:29PM 1.77 | 7:32AM 1.81 | 9:26PM 1.63 | 8:10AM 1.71 | 10:40PM 1.50 | 8:57AM 1.58 | 12:20AM 1.44 | 10:13AM 1.44 | |||||||||
Low Tide / height (m) | 12:04AM 0.52 | 12:22PM 0.05 | 12:40AM 0.62 | 1:01PM -0.01 | 1:17AM 0.76 | 1:43PM 0.01 | 1:55AM 0.90 | 2:29PM 0.10 | 2:38AM 1.04 | 3:24PM 0.24 | 3:33AM 1.15 | 4:34PM 0.39 | 5:12AM 1.22 | |||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Fri 24 | ||||||||||||||||
| Sunrise | - | 5:31 | - | - | 5:30 | - | - | 5:28 | - | - | 5:28 | - | - | 5:26 | - | - | 5:26 | - | - | 5:24 | - | |
| Sunset | - | - | 6:37 | - | - | 6:37 | - | - | 6:37 | - | - | 6:38 | - | - | 6:39 | - | - | 6:40 | - | - | 6:40 | |
 |  | |  |  | |  |  |  | | | |  | | |  |  |  |  |  | | ||
Rain (mm) | 2 | - | - | - | - | - | - | - | 3 | - | - | - | - | - | - | 37 | 14 | 9 | 1 | 5 | 7 | |
| Temp. °C | 17 | 19 | 19 | 17 | 19 | 20 | 17 | 20 | 19 | 17 | 22 | 21 | 15 | 19 | 20 | 18 | 19 | 18 | 17 | 16 | 17 | |
| Feels °C (?) | 16 | 19 | 19 | 18 | 19 | 20 | 17 | 18 | 17 | 17 | 18 | 19 | 13 | 17 | 19 | 19 | 21 | 20 | 17 | 16 | 19 | |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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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