Surf Forecasts:
Monabe Rivermouth surf forecast from 22 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: Saturday 25 Jul, 3AM (local time) - 1.5ft (0.4m), 16s period, SE swell with 94 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. 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 0.4m 16s and forecast to arrive on Saturday (Jul 25) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 8s period and expected on Wednesday (Jul 29) at 3PM.
| 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 | 3AM (Sat 25th Jul) | 1.5ft (0.4m) 16s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
The Lowdown
G’day, Rusty here. Gotta be straight: the next week and a half is a flat spell for Monabe Rivermouth. This river mouth rarely breaks, so a quiet run is more normal here. The first half of the 16 days gives you next to nothing, but the second week shows a big shift in the pattern.
From Thursday, July 23 through to Saturday, August 1, you’re looking at waves from 1 ft to 2 ft from the east or southeast with weak to modest energy – nothing to get excited about. The winds are glassy or light offshore at times, but the surf simply isn’t there.
A pulse shows Sunday, August 2 with a 3 ft swell from the ESE and moderate energy. The real standout is Monday, August 3 and Tuesday, August 4. Monday morning serves up a clean 6 ft east swell with an 18-second period – that’s very long-period groundswell, best for a river mouth setup, offering real shape and wider gaps between sets. Energy is strong at 2040. Tuesday morning is even bigger at 7 ft from the east, 18-second period, and massive energy (2974). Both mornings have glassy light winds, meaning clean faces. At 7 ft it’s for experts only. The afternoons get bumpy with light onshores, so make it dawn.
So the clear best of the whole period: Monday, August 3 and Tuesday, August 4 mornings at Monabe Rivermouth. After that, it fades fast from Wednesday, August 5 with dropping size and poor surf.
Keep the faith – forecasts can flip. Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat afternoon. Warm (max 31°C on Thu afternoon, min 27°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Sun afternoon. Warm (max 30°C on Sun morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | ||||||||||||||
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 10 | E 10 | SE 10 | E 10 | SE 18 | SE 18 | SE 16 | SE 16 | SE 16 | SE 16 | SE 15 | SE 15 | SE 14 | SE 14 | ESE 10 | S 9 | SE 10 | ESE 10 | ESE 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 18 | 18 | 18 | 17 | 49 | 49 | 42 | 91 | 90 | 87 | 78 | 77 | 74 | 72 | 71 | 74 | 51 | 67 | 65 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | on | off | glassy | on | off | glassy | on | off | glassy | glassy | cross-off | glassy | on | off | glassy | on | cross-off |
High Tide | 11:25PM1.51m | 2:21PM1.26m | 00:20AM1.46m | 4:03PM1.34m | 1:37AM1.44m | 4:53PM1.44m | 2:50AM1.47m | 5:27PM1.53m | 3:48AM1.54m | 5:56PM1.60m | 4:35AM1.62m | 6:23PM1.66m | |||||||
Low Tide | 6:59AM0.64m | 6:19PM1.16m | 8:17AM0.59m | 8:22PM1.21m | 9:22AM0.50m | 9:48PM1.18m | 10:13AM0.41m | 10:39PM1.11m | 10:54AM0.31m | 11:15PM1.04m | 11:31AM0.23m | 11:47PM0.96m | |||||||
 |  | | | | | | |  | |  | |  | | | | | | | |
 | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:13 | — | — |
 | 7:12 | — | 7:10 | — | — | 7:10 | — | — | 7:09 | — | — | 7:09 | — | — | 7:08 | — | — | 7:07 | — |
mm | — | — | — | — | — | — | — | — | 2 | — | 1 | 3 | 4 | 1 | 2 | 1 | 1 | 1 | 2 |
Temp °C | 27 | 30 | 31 | 28 | 31 | 31 | 28 | 31 | 31 | 28 | 30 | 29 | 28 | 29 | 29 | 27 | 29 | 30 | 27 |
Feels °C | 33 | 35 | 36 | 34 | 35 | 35 | 33 | 35 | 35 | 34 | 34 | 34 | 34 | 33 | 33 | 32 | 33 | 34 | 32 |
Swell 1 Height (m) Direction Period (s) | E 10 | E 10 | SE 10 | E 10 | SE 10 | SSW 4 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | S 9 | S 8 | S 8 | S 8 | S 9 | S 8 | S 8 | ESE 10 |
| kJ | 18 | 18 | 15 | 17 | 14 | 3 | 42 | 41 | 37 | 35 | 50 | 37 | 49 | 49 | 52 | 74 | 51 | 51 | 65 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | SW 4 | E 10 | SE 10 | SE 18 | SE 18 | SE 16 | SE 16 | SE 16 | SE 16 | S 9 | SE 11 | SE 11 | SE 10 | ESE 10 | SE 10 | SE 10 | ESE 10 | S 8 |
| kJ | 10 | 2 | 18 | 16 | 49 | 49 | 42 | 91 | 90 | 87 | 40 | 55 | 57 | 37 | 68 | 51 | 50 | 67 | 34 |
Swell 3 Height (m) Direction Period (s) | SSE 8 | SE 9 | SE 19 | SSW 4 | SSW 4 | SE 9 | E 9 | E 9 | S 8 | S 8 | SE 15 | SE 15 | SE 14 | SE 14 | SE 14 | SE 14 | SE 13 | SE 13 | S 5 |
| kJ | 6 | 14 | 15 | 1 | 1 | 14 | 15 | 6 | 10 | 10 | 78 | 77 | 74 | 72 | 71 | 29 | 28 | 28 | 11 |
Wind waves Height (m) Direction Period (s) | SW 3 | — | SSW 4 | — | — | — | WSW 4 | NNE 3 | — | W 4 | — | — | — | — | SE 3 | SSW 3 | — | SSW 4 | — |
| kJ | 2 | — | 1 | — | — | — | 2 | 1 | — | 1 | — | — | — | — | 2 | 1 | — | 7 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 235 | 47 | 490 | 47 | 9 | 50 | 9 | 9 | 42 | 9 | 9 | 9 | 9 | 9 | 47 | 9 | 9 | 42 | 9 |
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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