Surf Forecasts:
Monabe Rivermouth surf forecast from 18 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 3AM (local time) - 1.5ft (0.4m), 16s period, SE swell with 94 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 0.4m 16s and forecast to arrive on Saturday (Jul 25) at 3AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 6s period and expected on Sunday (Jul 19) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| 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, I'm Rusty. Let's have a look at what's on the cards for the local surf scene.
Right off the bat, I gotta tell you, it's a tough start. We're looking at a long, dry spell with no real surf to speak of. From now, right through until the morning of the 27th of July, you're not going to find any quality waves. The swell is tiny, the energy is weak, and the wind is all over the shop. It's a real bummer for a stretch.
The first real flicker of activity comes on the morning of Monday the 27th of July at Monabe Rivermouth. The swell suddenly jumps up to 7ft out of the southeast, with a period of 15 seconds – that's a proper groundswell. The combined energy is a massive 1745, but the wind is a light cross-onshore from the SSE, which will mess with the shape. It's still a bit of a wildcard, so keep your expectations in check.
The 28th of July, Tuesday, sees the swell peak. The morning has a solid 13ft of southeast swell, 16-second period, and a huge energy of 6675. The wind is light cross-onshore, so it'll be lumpy but rideable for the experts. As the afternoon comes in, the wind picks up to 12 mph from the same direction, making it choppy and a real handful. This is serious, big-wave territory – only for the very experienced.
After that, the wind becomes a real problem. The 29th of July has a 10ft swell, but the wind is a strong cross-shore, making it a mess. By the 30th, we're looking at near-gale force winds, which is just a no-go for paddling. Honestly, for that period, the setup looks more interesting for kite surfing than paddle surfing.
If you're looking for the standout, I'd say the morning of the 28th of July at Monabe Rivermouth is the pick of the bunch. It's not perfect, but 13ft of southeast swell with that long period and just light cross-onshore wind is about as good as it gets in this window. Just be aware it's a rare break, so it's a bit of a gamble. The water temp is about average for the time of year, nothing wild.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Warm (max 29°C on Sun morning, min 25°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Thu morning, min 26°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | ||||||||||||||
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 10 | E 9 | E 9 | E 9 | E 11 | ESE 11 | ESE 10 | E 10 | E 10 | E 10 | E 10 | SE 10 | E 10 | SE 18 | SE 18 | SE 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 41 | 41 | 44 | 65 | 60 | 60 | 60 | 58 | 37 | 21 | 33 | 32 | 17 | 17 | 18 | 17 | 49 | 49 | 42 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | on | cross-off | glassy | on | glassy | on | on | glassy | cross-on | on | glassy | glassy | on | off | glassy | on | glassy |
High Tide | 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 | 4:03PM1.34m | 1:37AM1.44m | ||||||
Low Tide | 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 | 8:17AM0.59m | 8:22PM1.21m | |||||||
 |  | |  | | | | | | | | | | | | | | | | |
 | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:09 | — | — | 5:09 | — | — | 5:11 | — | — |
 | 7:14 | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:10 | — | — | 7:10 | — |
mm | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 29 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 30 | 30 | 28 | 30 | 30 | 27 |
Feels °C | 34 | 32 | 32 | 33 | 33 | 33 | 33 | 35 | 33 | 33 | 34 | 33 | 33 | 35 | 34 | 34 | 34 | 34 | 32 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 10 | E 10 | E 9 | E 9 | E 9 | E 11 | ESE 8 | E 8 | E 10 | E 10 | E 10 | E 10 | SE 10 | E 10 | SE 9 | E 10 | SE 11 |
| kJ | 41 | 41 | 44 | 65 | 60 | 60 | 60 | 58 | 22 | 12 | 33 | 32 | 17 | 17 | 15 | 17 | 14 | 16 | 42 |
Swell 2 Height (m) Direction Period (s) | SE 8 | ESE 5 | ESE 5 | SE 9 | SSE 9 | SSE 8 | SSE 8 | SSW 8 | ESE 11 | ESE 10 | ESE 10 | ESE 11 | SSW 4 | SE 9 | E 10 | SE 10 | SE 18 | SE 18 | SE 16 |
| kJ | 11 | 10 | 10 | 13 | 7 | 14 | 7 | 6 | 37 | 21 | 11 | 11 | 1 | 14 | 18 | 16 | 49 | 49 | 42 |
Swell 3 Height (m) Direction Period (s) | SSW 6 | SSW 7 | SSW 7 | SSW 6 | ESE 12 | ESE 11 | SSW 7 | SSE 8 | SSE 8 | SSW 3 | SSE 8 | SSE 8 | ESE 10 | SSW 7 | S 7 | SSW 7 | E 10 | SE 9 | E 9 |
| kJ | 7 | 9 | 4 | 3 | 13 | 13 | 5 | 7 | 6 | 1 | 6 | 6 | 10 | 5 | 4 | 5 | 17 | 14 | 15 |
Wind waves Height (m) Direction Period (s) | ESE 4 | — | — | — | — | SSW 5 | — | — | SSW 8 | SW 3 | SSW 3 | SSW 3 | SW 4 | — | SSW 7 | SW 6 | — | ESE 7 | — |
| kJ | 2 | — | — | — | — | 2 | — | — | 6 | 2 | 1 | 1 | 2 | — | 4 | 6 | — | 5 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 9 | 9 | 42 | 9 | 9 | 42 | 9 | 9 | 42 | 42 | 235 | 910 | 238 | 238 | 923 | 47 | 9 | 50 | 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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