
Surf Forecasts:
Monabe Rivermouth surf forecast from 10 Jul 2026:
- Best quality surf: Friday 10 Jul, 9PM (local time) - 13ft (4.0m), 17s period, S swell with glassy winds.
- Most powerful swell: Saturday 11 Jul, 6AM (local time) - 15ft (4.5m), 17s period, S swell with 11,955 kJ wave energy.
- Next surfable swell (1★+): Friday 10 Jul, 9PM (local time) - 13ft (4.0m), 17s 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 Friday (Jul 10) at 9PM. The primary swell is predicted to be 4.0m and 17s 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 4.5m 17s and forecast to arrive on Saturday (Jul 11) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.0m 17s period and expected on Saturday (Jul 11) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 10th Jul) | 13ft (4.0m) 17s |
| Best Surf | 9PM (Fri 10th Jul) | 13ft (4.0m) 17s |
| Most Powerful | 6AM (Sat 11th Jul) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
Alright, Rusty here. Let's have a look at what's on the cards for this stretch.
First off, we’ve got a serious pulse of swell coming through, but it's not for everyone. The first few days are all about a big, powerful S groundswell hitting Monabe Rivermouth. This is a river mouth break, and it's a sheltered one, so it really needs the right direction to fire. The optimum swell direction is from the east, but we're getting a solid south pulse.
Friday, July 10th, starts off with a bang. There's a 13ft S swell with a very long 17-second period. The water temp is 77°, which is a bit colder than normal for this time of year. Friday morning is glassy, with zero wind, and the combined energy of all swells is strong to very strong (7851). That's excellent for experienced surfers only. This swell is too big for beginners, and with that long period, it's going to be a very powerful, walled-up wave at a river mouth. It could be a bit scary, but for the right crew, it's a proper session. Friday afternoon, the wind swings onshore and the outlook drops off.
Saturday, July 11th, the morning is even bigger. The swell bumps up to 15ft, still from the south with that 17-second period, and it's glassy again. The combined energy is very strong (11381). This is a serious, heavy, expert-only day. The quality is there, but the size and the specific direction are a caveat for a spot that prefers east in its optimum. This is the standout window, but it's a short, intense window just for the experienced.
After Saturday morning, it all just shuts down. There's a massive gap in surfable waves. Sunday through to the following Monday, July 20th, the swell drops to almost nothing. We're looking at a week of tiny, weak waves and poor conditions with a mix of onshore breezes. It's a blank run.
Things start to wake up a little around Tuesday, July 21st. We get a new, smaller ESE swell. The morning of the 21st is glassy with a 4ft ESE swell at 9 seconds. The combined energy (238) is moderate. It's described as very ordinary, but it's surfable. Wednesday, July 22nd, morning is similar – 3ft E swell, glassy, with moderate energy (252). Still "ordinary," but it's clean.
The next small window is Thursday the 23rd morning, with a 3ft E swell, glassy, moderate energy (316). Then Friday the 24th morning, with a 4ft S swell, glassy, moderate-to-strong energy (612). It's still nothing to write home about, just small, clean waves.
To be honest, the only real standout is that first Friday and Saturday morning. It's a massive, powerful, and clean swell. But it's a short-lived, expert-only affair at a break that's rarely breaking. After that, it's a long, quiet stretch. The second week offers a few small, clean mornings, but nothing that’s going to get the heart racing. It's a bit of a tease, that big swell up front.
Stay safe out there, and don't be a hero if you're not ready for that size.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Sun night. Warm (max 28°C on Sun morning, min 23°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Mon afternoon. Warm (max 29°C on Mon afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | |||||||||||||||
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) | S 17 | S 17 | S 17 | S 17 | SSW 17 | SSW 17 | SSW 16 | E 9 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 12 | E 9 | E 9 | E 9 | E 9 | E 10 | E 9 | E 10 |
Wave Graph | |||||||||||||||||||||
7851 | 8960 | 10444 | 11381 | 0 | 0 | 0 | 16 | 18 | 17 | 17 | 26 | 15 | 22 | 14 | 45 | 44 | 40 | 47 | 41 | 67 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross-off | glassy | on | glassy | glassy | on | cross-off | glassy | cross-on | glassy | glassy | on | glassy | on | on | glassy | glassy | on | off |
High Tide | 3:02PM1.45m | 1:48AM1.61m | 4:18PM1.58m | 2:54AM1.66m | 5:16PM1.70m | 3:56AM1.73m | 6:05PM1.79m | 4:52AM1.81m | 6:48PM1.85m | 5:43AM1.87m | 7:28PM1.86m | 6:33AM1.89m | 8:05PM1.84m | ||||||||
Low Tide | 8:06PM1.07m | 9:06AM0.29m | 9:29PM1.09m | 10:07AM0.13m | 10:35PM1.06m | 11:01AM-0.00m | 11:28PM1.00m | 11:51AM-0.09m | 00:14AM0.93m | 12:37PM-0.11m | 00:58AM0.86m | 1:21PM-0.05m | 1:40AM0.79m | ||||||||
5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | |
— | 7:16 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | |
mm | — | — | — | — | — | — | — | 1 | 6 | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 25 | 27 | 27 | 25 | 28 | 27 | 25 | 28 | 29 | 27 | 29 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 25 |
Feels °C | 30 | 30 | 29 | 30 | 30 | 30 | 32 | 31 | 29 | 32 | 34 | 32 | 33 | 32 | 31 | 31 | 31 | 30 | 31 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | S 17 | S 17 | S 17 | S 17 | SSW 17 | SSW 17 | SSW 16 | SSW 14 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SE 6 | E 9 | E 10 |
7851 | 8960 | 10444 | 11381 | 12042 | 11940 | 6991 | 3668 | 1543 | 937 | 679 | 476 | 314 | 245 | 149 | 116 | 88 | 54 | 26 | 41 | 67 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | E 9 | E 9 | SE 10 | E 9 | SE 10 | E 9 | E 9 | E 9 | E 9 | ESE 5 | E 9 | SSW 8 | SSW 8 | SSW 8 |
— | — | — | — | — | — | — | 16 | 15 | 17 | 15 | 26 | 14 | 14 | 14 | 45 | 9 | 40 | 38 | 37 | 24 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SE 11 | E 9 | SE 10 | E 9 | SE 10 | SE 12 | ESE 4 | SE 11 | E 9 | ESE 5 | E 10 | SE 6 | SE 6 |
— | — | — | — | — | — | — | — | 18 | 15 | 17 | 14 | 15 | 22 | 3 | 29 | 44 | 9 | 47 | 17 | 11 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | ENE 3 | E 3 | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 50 | 0 | 0 | 42 | 20 | 42 | 42 | 9 | 9 | 42 | 9 | 9 | 75 | 9 | 20 | 335 | 9 | 9 | 75 | 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.










