Surf Forecasts:
Monabe Rivermouth surf forecast from 14 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 9AM (local time) - 2ft (0.6m), 9s period, ESE swell with 66 kJ wave energy.
Best Forecast Surf Conditions for Monabe Rivermouth this week:
The most powerful waves expected at Monabe Rivermouth in the next 16 days are 0.6m 9s and forecast to arrive on Sunday (Jul 19) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 8s period and expected on Thursday (Jul 16) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Sun 19th Jul) | 2ft (0.6m) 9s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s on the menu for the next couple of weeks.
Honestly, it’s a pretty quiet outlook for this stretch. The only break in the game is Monabe Rivermouth, and even then, it’s a spot that rarely breaks, so we’re starting from a tricky spot right off the bat. Water temp is sitting around 79°, which is about average for the time of year, so no surprises there.
We’ve got a gap of nearly two weeks where the surf just isn’t worth your time. From Tuesday, July 14, right through to Tuesday morning, July 29, everything is flagged as poor surf conditions. Swell heights stay tiny, between 1.0 ft and 2 ft, with combined swell energy mostly in the weak range, hitting numbers like 37 and peaking around 168. It’s all very weak to moderate energy at best. Periods hang around 9 to 12 seconds, so there’s a bit of groundswell character, but with such small size and the rivermouth setup, it’s just not going to shape up into anything rideable.
The bright spot, and the only real standout, is Wednesday, July 29. That morning, we finally see a pulse of better energy. Swell bumps to 3 ft from the ESE, with a period of 13 seconds, and combined energy jumps to 380, putting us in moderate territory. Winds go glassy with a slight air, so it’ll be clean. The swell direction is ESE, which matches the optimum east direction for this spot, so that’s a good sign. However, by the afternoon, it drops off a bit and winds go cross-on, so the window is tight.
For the July 29 morning, Monabe Rivermouth is the call. It’s 3 ft ESE swell, glassy conditions, and the rivermouth can focus that energy nicely if it’s working. Keep in mind it’s an inconsistent break that rarely breaks, so this is a rare chance to get in. Crowds are only sometimes an issue, but with the lack of other options, it might feel a little busier if it’s actually breaking.
Beyond that, the forecast gets a bit more interesting further out, with longer period SE swells showing up in the last few days of July, but those are still in the poor condition category for now. We’ll have to see how that shapes up.
For now, mark your calendar for the morning of July 29. That’s your best shot.
- Rusty
Short Range ForecastMostly dry. Warm (max 30°C on Tue afternoon, min 26°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Fri night. Warm (max 30°C on Fri afternoon, min 26°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tue 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SE 12 | SE 12 | SE 11 | E 10 | SE 10 | ESE 10 | ESE 10 | E 10 | E 9 | E 9 | E 9 | E 9 | E 9 | ESE 10 | ESE 9 | E 10 | E 9 | E 9 | E 9 | E 9 | ESE 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 22 | 21 | 18 | 17 | 17 | 30 | 31 | 29 | 27 | 24 | 42 | 39 | 38 | 32 | 66 | 49 | 41 | 25 | 25 | 14 | 22 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | glassy | on | off | glassy | cross-on | off | glassy | on | off | glassy | on | cross-off | glassy | on | glassy | glassy | on | glassy | glassy |
High Tide | 6:48PM1.85m | 5:43AM1.87m | 7:28PM1.86m | 6:33AM1.89m | 8:05PM1.84m | 7:20AM1.86m | 8:40PM1.80m | 8:08AM1.78m | 9:12PM1.74m | 8:56AM1.65m | 9:43PM1.69m | 9:48AM1.51m | 10:14PM1.63m | 10:51AM1.37m | |||||||
Low Tide | 00:14AM0.93m | 12:37PM-0.11m | 00:58AM0.86m | 1:21PM-0.05m | 1:40AM0.79m | 2:01PM0.07m | 2:22AM0.74m | 2:40PM0.24m | 3:06AM0.70m | 3:16PM0.45m | 3:52AM0.67m | 3:50PM0.66m | 4:44AM0.67m | ||||||||
 |  | |  | | | |  | | |  | | | | | | | |  | | | |
 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 |
 | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | 7:13 |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 1 | — | — |
Temp °C | 30 | 28 | 30 | 29 | 28 | 30 | 30 | 28 | 30 | 30 | 27 | 30 | 30 | 27 | 29 | 30 | 27 | 29 | 29 | 27 | 30 |
Feels °C | 34 | 33 | 35 | 33 | 33 | 35 | 34 | 33 | 33 | 34 | 32 | 34 | 34 | 32 | 34 | 34 | 32 | 34 | 34 | 32 | 34 |
Swell 1 Height (m) Direction Period (s) | SSW 10 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | E 9 | E 9 | E 9 | SSW 6 | SSW 6 | SW 6 | E 9 | E 9 | SW 6 | SW 5 | SSW 7 |
| kJ | 235 | 146 | 151 | 165 | 157 | 178 | 114 | 93 | 66 | 40 | 42 | 39 | 38 | 13 | 27 | 40 | 41 | 25 | 18 | 6 | 18 |
Swell 2 Height (m) Direction Period (s) | SE 12 | SE 12 | SE 11 | E 10 | ESE 9 | ESE 10 | ESE 10 | E 10 | E 9 | E 9 | SSW 7 | SW 6 | SSW 6 | ESE 10 | ESE 9 | E 10 | SSW 5 | SSW 6 | E 9 | E 9 | ESE 11 |
| kJ | 22 | 21 | 18 | 17 | 17 | 30 | 31 | 29 | 27 | 24 | 17 | 10 | 15 | 32 | 66 | 49 | 11 | 14 | 25 | 14 | 22 |
Swell 3 Height (m) Direction Period (s) | E 9 | E 9 | E 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SE 10 | SE 9 | SE 10 | SE 10 | SE 8 | SSE 9 | SE 8 | SE 8 | SE 9 | SE 9 | ESE 8 | SE 8 |
| kJ | 15 | 15 | 17 | 17 | 17 | 16 | 15 | 15 | 14 | 15 | 13 | 23 | 24 | 24 | 8 | 9 | 10 | 19 | 19 | 7 | 11 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SW 6 | — | — | — | — | E 3 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 96 | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 42 | 9 | 9 | 42 | 9 | 9 | 75 | 9 | 9 | 42 | 9 | 9 | 284 | 9 | 9 | 578 | 9 | 9 | 20 | 238 | 9 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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