Surf Forecasts:
Monabe Rivermouth surf forecast from 17 Jul 2026:
- Most powerful swell: Tuesday 21 Jul, 9AM (local time) - 2ft (0.6m), 11s period, E swell with 83 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 11s and forecast to arrive on Tuesday (Jul 21) 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 0.4m 6s period and expected on Saturday (Jul 18) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Tue 21st Jul) | 2ft (0.6m) 11s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
The Lowdown
G’day, Rusty here. Look, I’ll level with ya – the first week and a half is a total write-off. We’re looking at nothing but tiny, weak dribble from the 17th through to the 25th of July, with combined swell energy barely cracking 100 (40 to 132). It’s just not worth paddling out for. The water’s sitting at 82°, which is about average for this time of year, nothing weird there.
The first real glimmer of hope comes on the morning of Sunday the 26th of July. Monabe Rivermouth will see a bump to 3 ft from the SE, with a 14-second period and moderate energy (387). The wind is glassy, so the surface will be clean. But this is a river break that rarely breaks, so don’t expect it to be consistent. Still, it’s the best you’ll get for a while.
Now, the real standout – and I mean the one you’ve been waiting for – lands on the morning of Tuesday the 29th of July. Swell jumps to 13 ft from the S, with a very long 16-second period and massive energy (7356). That’s expert-only territory, way over 8 ft, so leave the foamies at home. The wind is glassy, and the break is a rivermouth, so that long-period groundswell will wrap in nicely. This is a serious session for the experienced crew. The morning of Wednesday the 30th of July is also firing, with 15 ft from the S, 16-second period, and even more energy (10536), again glassy. This is the best on offer.
After that, the end of the month and into August gets messy. The 31st of July and 1st of August see a wind shift to cross-on, and the swell direction goes ESE with a short, weak period (7-8 seconds). The energy drops (377 to 784), and conditions are poor. Not worth it.
So, to sum it up: wait for the 29th and 30th of July mornings. That’s your window. The rest is a flat spell or a blown-out mess.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Warm (max 30°C on Sat afternoon, min 25°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Tue morning. Warm (max 30°C on Wed morning, min 26°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | ||||||||||||||
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 9 | E 9 | E 10 | E 10 | E 9 | E 9 | E 9 | E 11 | ESE 8 | ENE 11 | E 10 | E 10 | E 10 | E 10 | SE 10 | E 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 41 | 39 | 47 | 41 | 41 | 44 | 65 | 60 | 59 | 60 | 83 | 22 | 22 | 31 | 33 | 18 | 17 | 17 | 17 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | on | glassy | cross-on | on | cross-off | glassy | cross-on | glassy | glassy | cross-on | glassy | glassy | on | glassy | glassy | on | glassy |
High Tide | 8:08AM1.78m | 9:12PM1.74m | 8:56AM1.65m | 9:43PM1.69m | 9:48AM1.51m | 10:14PM1.63m | 10:51AM1.37m | 10:46PM1.56m | 12:17PM1.26m | 11:25PM1.51m | 2:21PM1.26m | 00:20AM1.46m | |||||||
Low Tide | 2:22AM0.74m | 2:40PM0.24m | 3:06AM0.70m | 3:16PM0.45m | 3:52AM0.67m | 3:50PM0.66m | 4:44AM0.67m | 4:25PM0.85m | 5:45AM0.66m | 5:07PM1.03m | 6:59AM0.64m | 6:19PM1.16m | |||||||
 |  | |  | | |  | | |  |  | | | | | | | | | |
 | — | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:09 | — | — | 5:09 | — | — |
 | 7:15 | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:10 | — |
mm | — | — | — | 2 | — | — | — | — | — | 1 | 3 | 2 | 1 | — | — | — | — | — | — |
Temp °C | 27 | 29 | 30 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 30 | 30 | 27 | 30 | 30 | 27 |
Feels °C | 31 | 33 | 34 | 33 | 33 | 33 | 33 | 32 | 33 | 33 | 34 | 34 | 33 | 34 | 35 | 33 | 34 | 34 | 33 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 10 | E 9 | E 9 | E 10 | E 10 | E 9 | E 9 | E 9 | E 11 | ESE 8 | ESE 8 | E 10 | E 10 | E 10 | E 10 | SE 10 | E 10 |
| kJ | 41 | 39 | 47 | 41 | 41 | 44 | 65 | 60 | 59 | 60 | 83 | 22 | 13 | 31 | 33 | 18 | 17 | 15 | 17 |
Swell 2 Height (m) Direction Period (s) | SW 7 | SW 6 | SSW 6 | SE 8 | ESE 5 | ESE 5 | SE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | ESE 10 | ENE 11 | ESE 11 | ESE 11 | ESE 10 | SE 9 | E 10 | SE 10 |
| kJ | 11 | 10 | 7 | 11 | 9 | 8 | 13 | 7 | 7 | 7 | 7 | 21 | 22 | 11 | 11 | 11 | 14 | 17 | 16 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 8 | SSW 6 | SE 8 | SSW 6 | SSW 6 | ESE 12 | ESE 11 | SSW 7 | SSW 8 | SSE 8 | ESE 11 | SSE 8 | SSE 8 | SE 11 | S 8 | SSW 7 | SSE 8 |
| kJ | 14 | 12 | 11 | 7 | 10 | 4 | 3 | 14 | 13 | 5 | 6 | 6 | 11 | 6 | 6 | 4 | 4 | 5 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | E 3 | — | — | — | — | SW 5 | SW 8 | — | SSW 8 | — | — | — | — | — | SW 7 | — |
| kJ | — | — | — | 1 | — | — | — | — | 1 | 9 | — | 6 | — | — | — | — | — | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 9 | 9 | 531 | 9 | 20 | 42 | 9 | 9 | 42 | 9 | 9 | 42 | 42 | 9 | 490 | 235 | 235 | 516 | 47 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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