Surf Forecasts:
Monabe Rivermouth surf forecast from 27 Jul 2026:
- Best quality surf: Monday 27 Jul, 6PM (local time) - 2.5ft (0.7m), 9s period, S swell with glassy winds.
- Most powerful swell: Monday 3 Aug, 3PM (local time) - 5ft (1.6m), 15s period, ESE swell with 1,147 kJ wave energy.
- Next surfable swell (1★+): Monday 27 Jul, 6PM (local time) - 2.5ft (0.7m), 9s 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 Monday (Jul 27) at 6PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.6m and 10s. Another secondary swell of 0.2m and 3s is also forecast. 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 1.6m 15s and forecast to arrive on Monday (Aug 03) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Tuesday (Jul 28) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 27th Jul) | 2.5ft (0.7m) 9s |
| Best Surf | 6PM (Mon 27th Jul) | 2.5ft (0.7m) 9s |
| Most Powerful | 3PM (Mon 3rd Aug) | 5ft (1.6m) 15s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's have a look at what's on the table.
Alright, straight up, we're looking at a quiet start. For the first week, starting Monday, July 27th, through to the end of July and into the first couple of days of August, there's just nothing doing at Monabe Rivermouth. Tiny swell, poor conditions, and a lot of flat days. We're talking a solid 7 to 8 day gap with no real surf worth paddling out for, so don't bother waxing up just yet.
Now, things get interesting as we move into the second week. The whole pattern shifts on Monday, August 3rd, when a bigger, longer-period ESE groundswell starts showing up. It's a bit messy with cross-shore wind that morning, but the real standout window opens up Tuesday, August 4th. That morning, it's gonna be a full-on 8 ft of ESE swell with a very long 17 second period, and the wind is completely glassy – calm as a lake. The combined energy is pumping at 4018. This is proper groundswell, and for a setup like a river mouth, that long period is going to peel beautifully. It's big though, over 8 ft, so this one's for experienced surfers only. The water temperature is sitting at 85°, which is much warmer than normal for this time of year.
Wednesday morning, August 5th, is another cracker. Same 10 ft of ESE swell, same 17 second period, with a glassy southwesterly light air. The combined energy is even higher at 5733. That's another top-shelf session for the crew who know what they're doing.
Thursday, August 6th, is the final standout of that run. Morning sees an 12 ft ESE swell with an offshore breeze, but the afternoon shifts to a clean 12 ft easterly swell with a gentle offshore from the north – that's peak conditions for this spot. The energy readings are huge, in the 7000s. Again, this is expert-only territory. By Friday, August 7th, it drops off a bit and gets more marginal, and by the weekend it's fizzling out back into small, ordinary surf for the following Monday and Tuesday.
So, to wrap it up: the first week is a write-off, a total dud. The standout is undeniably the window from Tuesday, August 4th, through to Thursday, August 6th. That's when the big, clean groundswell hits with offshore or glassy winds. It's a short, powerful blast of proper surf, but it's for experts only. If you're not in that boat, you're waiting until the following week for some smaller, more manageable waves around Monday and Tuesday.
Stay salty.
Rusty.
Short Range ForecastMostly dry. Warm (max 32°C on Wed afternoon, min 27°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 33°C on Sat morning, min 27°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | |||||||||||||||
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) | SE 14 | S 9 | SE 10 | SE 10 | ESE 10 | ESE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 9 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | ESE 13 | ESE 12 | ESE 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 72 | 74 | 52 | 51 | 67 | 77 | 48 | 38 | 38 | 36 | 35 | 35 | 24 | 22 | 23 | 27 | 28 | 19 | 56 | 121 | 573 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | off | glassy | on | cross-off | glassy | glassy | off | glassy | on | glassy | glassy | on | off | glassy | on | off | glassy | cross-on | glassy |
High Tide | 5:56PM1.60m | 4:35AM1.62m | 6:23PM1.66m | 5:15AM1.70m | 6:49PM1.71m | 5:52AM1.76m | 7:14PM1.74m | 6:28AM1.79m | 7:38PM1.76m | 7:03AM1.79m | 8:03PM1.77m | 7:40AM1.75m | 8:28PM1.77m | ||||||||
Low Tide | 10:54AM0.31m | 11:15PM1.04m | 11:31AM0.23m | 11:47PM0.96m | 12:04PM0.17m | 00:17AM0.88m | 12:35PM0.14m | 00:48AM0.81m | 1:05PM0.16m | 1:19AM0.73m | 1:34PM0.21m | 1:51AM0.67m | 2:03PM0.30m | 2:26AM0.61m | |||||||
 |  |  | | |  | |  | | | | | | | | | | | |  |  | |
 | 5:13 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — |
 | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 7 |
Temp °C | 31 | 31 | 28 | 31 | 31 | 29 | 30 | 32 | 29 | 32 | 32 | 29 | 31 | 31 | 28 | 33 | 31 | 28 | 30 | 31 | 27 |
Feels °C | 34 | 35 | 33 | 35 | 35 | 33 | 33 | 35 | 32 | 34 | 35 | 32 | 34 | 34 | 32 | 36 | 34 | 33 | 34 | 35 | 32 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 9 | S 8 | S 8 | ESE 10 | SSW 5 | SSW 6 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | SSW 5 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | ESE 13 | ESE 12 | ESE 15 |
| kJ | 50 | 74 | 52 | 51 | 67 | 51 | 24 | 38 | 38 | 36 | 35 | 15 | 22 | 22 | 23 | 27 | 28 | 19 | 56 | 121 | 573 |
Swell 2 Height (m) Direction Period (s) | SE 10 | ESE 10 | SE 10 | SE 10 | S 8 | ESE 10 | SE 10 | SSW 8 | SW 5 | SW 5 | SW 4 | ESE 9 | SW 4 | SW 6 | SE 11 | SSW 4 | SW 6 | ESE 14 | ESE 17 | ESE 16 | SE 10 |
| kJ | 37 | 68 | 51 | 50 | 34 | 65 | 48 | 19 | 12 | 6 | 5 | 35 | 3 | 6 | 20 | 2 | 2 | 19 | 56 | 94 | 16 |
Swell 3 Height (m) Direction Period (s) | SE 14 | SE 14 | SE 14 | SE 13 | SE 13 | SSW 8 | SSW 8 | SE 13 | SSW 8 | SSW 8 | SSW 8 | S 8 | SE 12 | ESE 13 | SSW 5 | S 7 | SW 4 | E 11 | SE 11 | ENE 4 | SSW 8 |
| kJ | 72 | 71 | 29 | 28 | 28 | 22 | 21 | 26 | 11 | 11 | 11 | 4 | 24 | 16 | 2 | 1 | 1 | 9 | 19 | 3 | 6 |
Wind waves Height (m) Direction Period (s) | — | — | SW 3 | SW 4 | SSW 4 | SW 5 | W 3 | WSW 4 | WNW 3 | — | SW 4 | — | — | — | — | — | — | — | NE 4 | — | — |
| kJ | — | — | 1 | 4 | 13 | 77 | 2 | 16 | 2 | — | 7 | — | — | — | — | — | — | — | 2 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 42 | 9 | 9 | 50 | 9 | 9 | 9 | 9 | 9 | 238 | 9 | 47 | 565 | 638 | 2187 | 565 | 47 | 9 | 20 | 0 |
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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