
Surf Forecasts:
Monabe Rivermouth surf forecast from 11 Jul 2026:
- Best quality surf: Saturday 18 Jul, 9AM (local time) - 4.5ft (1.3m), 8s period, ESE swell with glassy winds.
- Most powerful swell: Saturday 18 Jul, 9PM (local time) - 5.5ft (1.7m), 8s period, ESE swell with 363 kJ wave energy.
- Next surfable swell (1★+): Saturday 18 Jul, 9AM (local time) - 4.5ft (1.3m), 8s period with ESE 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 Saturday (Jul 18) at 9AM. The primary swell is predicted to be 1.3m and 8s period with a secondary swell of 0.1m and 13s. 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 1.7m 8s and forecast to arrive on Saturday (Jul 18) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 17s period and expected on Saturday (Jul 11) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sat 18th Jul) | 4.5ft (1.3m) 8s |
| Best Surf | 9AM (Sat 18th Jul) | 4.5ft (1.3m) 8s |
| Most Powerful | 9PM (Sat 18th Jul) | 5.5ft (1.7m) 8s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
G’day, I’m Rusty.
Straight up, this is a tough 16-day stretch for Monabe Rivermouth. There’s not a single decent day in the whole run. The break is a river mouth that rarely breaks, is very sheltered, and only handles swell from the east. What little swell that shows up is tiny and weak, and even when the energy climbs a bit, the conditions are poor or just ordinary. Expect a long blank run with very little to get excited about.
Kicking off on Saturday 11 July, it’s a dead loss with no swell and a light breeze from the SSW. Sunday 12 July stays near flat with 1ft of weak easterly swell pushing through at 9 seconds – the combined energy is only 15, so barely a bump. The wind goes glassy in the morning which is nice, but there’s nothing to ride. Monday 13 July and Tuesday 14 July are similar: tiny 1ft south-east swells, glassy mornings, combined energy sitting between 32 and 37. Wednesday 15 July sees 1-1ft swell, still poor. By Thursday 16 July there’s 1-2ft from the east at 9 seconds, energy up to 79 – still hopeless for a wave.
Friday 17 July pushes a bit more east swell at 2-3ft, energy hitting 99 by the arvo, but a risk of thunderstorms and a cross-onshore breeze makes it a mess. Saturday 18 July is the first time the swell gets over 3ft – 4-5ft from the east-south-east at a short 8 seconds, combined energy at 244-279. Winds are glassy in the morning, clean in the arvo, and the models call it “surfable but very ordinary.” For a river mouth that rarely breaks, that’s about as good as it gets here, but it’s still nothing to write home about.
Sunday 19 July looks dangerous – 10ft of south-east groundswell at 12 seconds in the morning (energy 2018!) but it’s cross-onshore winds at 6 mph and the conditions are marginal. That size is only for experts, and the afternoon drops to 8ft but cranks up to 12 mph cross-onshore – choppy and poor. Monday 20 July to Wednesday 22 July are back to 3-5ft of short period swell, weak energy, and mostly poor conditions. Thursday 23 July and Friday 24 July offer 3-5ft from the east-south-east, with Friday morning glassy and 5ft at 9 seconds (energy 448) – surfable but ordinary.
Saturday 25 July and Sunday 26 July fade back to 2-3ft south swells, weak energy, and not worth paddling out.
Honestly, this spot is rarely breaking and the whole forecast is grim. A rare river break like this tends to stay poor for long stretches – forecasts can change, but right now there’s nothing to chase.
– Rusty
Short Range ForecastMostly dry. Warm (max 30°C on Tue morning, min 24°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Tue afternoon, min 25°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sat 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | SSW 17 | SSW 17 | SSW 16 | E 9 | E 9 | SE 10 | SE 10 | SE 11 | SE 12 | SE 12 | SE 12 | SE 11 | ESE 10 | ESE 9 | ESE 9 | E 9 | E 9 | E 9 | ESE 9 | SE 8 | ESE 8 |
Wave Graph | |||||||||||||||||||||
0 | 0 | 0 | 15 | 15 | 17 | 17 | 18 | 22 | 22 | 21 | 18 | 31 | 28 | 29 | 45 | 43 | 64 | 92 | 86 | 237 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | off | glassy | on | cross-off | glassy | on | off | glassy | on | off | glassy | on | glassy | glassy | on | glassy | glassy | cross-on | off | glassy |
High Tide | 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 | 7:20AM1.86m | 8:40PM1.80m | 8:08AM1.78m | |||||||
Low Tide | 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 | 2:01PM0.07m | 2:22AM0.74m | ||||||||
— | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | |
7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | 7:14 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — |
Temp °C | 28 | 25 | 27 | 28 | 26 | 29 | 29 | 28 | 30 | 30 | 28 | 30 | 29 | 27 | 29 | 28 | 26 | 29 | 30 | 26 | 30 |
Feels °C | 32 | 30 | 32 | 33 | 31 | 33 | 34 | 33 | 34 | 34 | 33 | 34 | 32 | 32 | 33 | 32 | 31 | 32 | 32 | 29 | 33 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 17 | SSW 16 | SSW 14 | SSW 12 | SSW 12 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | ESE 9 | SE 8 | SSW 8 |
12184 | 11788 | 7433 | 3954 | 1743 | 966 | 667 | 458 | 307 | 253 | 146 | 116 | 88 | 80 | 76 | 76 | 38 | 37 | 92 | 86 | 11 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | E 9 | E 9 | SE 10 | SE 10 | SE 11 | SE 12 | SE 12 | E 9 | E 10 | ESE 10 | ESE 9 | ESE 9 | E 9 | E 9 | E 9 | SSW 8 | E 10 | SE 13 |
— | — | — | 15 | 15 | 17 | 17 | 18 | 22 | 22 | 15 | 16 | 31 | 28 | 29 | 45 | 43 | 64 | 23 | 46 | 7 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | E 9 | E 9 | E 9 | E 9 | E 9 | SE 12 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 8 | SSW 8 | SSW 5 | SSW 8 | SW 10 |
— | — | — | — | — | 15 | 15 | 14 | 14 | 15 | 21 | 18 | 17 | 17 | 16 | 14 | 13 | 13 | 9 | 23 | 4 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 6 | SE 3 | SE 4 | SE 4 | E 4 | ESE 8 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 20 | 1 | 6 | 7 | 14 | 237 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 42 | 20 | 42 | 42 | 9 | 9 | 42 | 9 | 9 | 53 | 9 | 9 | 75 | 9 | 9 | 292 | 9 | 9 | 335 | 9 | 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.











