
Surf Forecasts:
Monabe Rivermouth surf forecast from 13 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 12AM (local time) - 3ft (0.9m), 9s period, ESE swell with 119 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 0.9m 9s and forecast to arrive on Sunday (Jul 19) at 12AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 11s period and expected on Monday (Jul 13) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12AM (Sun 19th Jul) | 3ft (0.9m) 9s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
G’day, I’m Rusty, and I’ve been staring at this forecast for Monabe Rivermouth for a while now. Gotta be straight with you—this is a tough one. For the next two weeks, it’s mostly tiny, weak, and pretty ordinary. The swell just doesn’t have any push for a proper paddle session.
First up, on Monday 13th July, we’ve got a tiny 1ft SE swell, but it’s 10 seconds—long enough to roll in but with only 32 units of energy (weak). Winds are light onshore, and the report says “poor surf conditions.” That’s the story for the next couple of weeks. Through Tuesday 14th to the 17th, it’s the same deal: knee-high dribble, mostly 1ft to 1ft, with periods around 9 to 12 seconds. Combined energy stays under 50 (weak). The odd morning glass-off with SW wind is the only silver lining, but the waves just aren’t there.
Saturday 18th July sees a tiny bump to 2ft from the ESE, period 10 seconds, and energy climbs to 110 (moderate). Still, the report says “poor surf conditions”—the wind is cross-on and the waves are messy. Sunday 19th morning has a glassy 3ft, only 8 seconds period, so it’s short and crumbly. Energy hits 84 (weak). This pattern holds through the week: small, weak, and mostly cross-onshore.
Then, around Monday 27th July, things change. The morning starts with a 6ft SSE swell, period 13 seconds, and combined energy jumps to 1089 (strong). That’s the first real pulse of the window. Winds are glassy, so it’ll be clean. The report says “expect good surf conditions.” That Monday morning is the standout—the biggest swell, cleanest wind, and decent energy. But at 6ft, it’s a bit much for beginners. The swell direction is SSE, which matches the optimum E direction reasonably well, but it’s coming from a more southerly angle, so the Rivermouth might handle it okay. Crowds are “sometimes” here, so you might share it.
Tuesday 28th July morning drops to 5ft from the S at 10 seconds, energy 607 (moderate). Winds are glassy again, but the report says “surfable waves but very ordinary conditions.” The afternoon gets messy. The long gap before that Monday pulse is a solid 13 days of nothing worth paddling out for.
Water temperature on Monday 13th is 79°F, with a -1°F anomaly—that’s about average for the time of year, so no shock there.
Overall, for the next 16 days, the only real shot is that Monday 27th July morning. It’s a long-range call, so keep an eye on it. Everything else is a bust. If you’re a kite surfer, the cross-on winds and small swell might make it interesting, but for a paddle surfer, it’s a waiting game.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Mon afternoon, min 27°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat afternoon. Warm (max 30°C on Thu afternoon, min 26°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Mon 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | |||||||||||||||
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) | SE 10 | SE 10 | SE 10 | SE 12 | SE 12 | SE 11 | SE 10 | ESE 9 | ESE 9 | E 10 | E 10 | SE 10 | E 9 | E 9 | SE 12 | ESE 10 | ESE 9 | ESE 8 | E 9 | E 9 | E 9 |
Wave Graph | |||||||||||||||||||||
17 | 16 | 15 | 22 | 21 | 18 | 27 | 17 | 29 | 30 | 29 | 15 | 28 | 28 | 40 | 108 | 119 | 82 | 42 | 42 | 38 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | off | glassy | on | glassy | glassy | on | off | on | cross-on | off | glassy | on | glassy | glassy | cross-on | glassy | glassy | cross-on | glassy | glassy |
High Tide | 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 | 9:12PM1.74m | 8:56AM1.65m | 9:43PM1.69m | 9:48AM1.51m | |||||||
Low Tide | 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 | 2:40PM0.24m | 3:06AM0.70m | 3:16PM0.45m | 3:52AM0.67m | ||||||||
— | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:07 | |
7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | 7:13 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — |
Temp °C | 30 | 28 | 30 | 30 | 28 | 30 | 30 | 28 | 30 | 30 | 28 | 30 | 29 | 27 | 29 | 28 | 26 | 28 | 28 | 26 | 29 |
Feels °C | 35 | 33 | 34 | 35 | 33 | 34 | 34 | 33 | 34 | 34 | 33 | 33 | 32 | 32 | 33 | 32 | 31 | 33 | 31 | 31 | 33 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 8 | SSW 7 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SW 7 | E 9 | E 9 | ESE 10 | ESE 9 | ESE 8 | E 9 | E 9 | E 9 |
667 | 458 | 307 | 235 | 146 | 113 | 134 | 91 | 150 | 84 | 81 | 41 | 22 | 28 | 40 | 108 | 119 | 82 | 42 | 42 | 38 | |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | E 9 | SE 12 | SE 12 | SE 11 | SE 10 | SSW 8 | ESE 9 | E 10 | E 10 | E 8 | E 9 | SSW 7 | SW 7 | SW 6 | SSW 6 | SW 6 | SE 8 | SW 4 | SSE 9 |
17 | 16 | 15 | 22 | 21 | 18 | 27 | 38 | 29 | 30 | 29 | 12 | 28 | 18 | 11 | 8 | 3 | 8 | 33 | 5 | 17 | |
Swell 3 Height (m) Direction Period (s) | E 9 | E 9 | SE 10 | E 9 | E 9 | E 10 | E 9 | ESE 9 | SE 10 | SE 9 | SE 10 | SE 10 | SSW 8 | SE 9 | SE 12 | E 4 | SSE 10 | E 5 | SSE 10 | SSE 9 | SW 8 |
15 | 15 | 15 | 15 | 15 | 17 | 15 | 17 | 17 | 14 | 15 | 15 | 11 | 13 | 36 | 2 | 9 | 2 | 19 | 28 | 10 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | ENE 2 | — | — | — | — | — | SSW 5 | SW 5 | — |
— | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 11 | 7 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 53 | 9 | 9 | 42 | 9 | 9 | 42 | 9 | 9 | 75 | 9 | 9 | 238 | 9 | 9 | 50 | 9 | 9 | 50 | 9 | 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.











