
Surf Forecasts:
Monabe Rivermouth surf forecast from 7 Jul 2026:
- Best quality surf: Saturday 11 Jul, 3AM (local time) - 15ft (4.5m), 17s period, S swell with cross-offshore winds.
- Most powerful swell: Saturday 11 Jul, 3AM (local time) - 15ft (4.5m), 17s period, S swell with 12,483 kJ wave energy.
- Next surfable swell (1★+): Tuesday 7 Jul, 3PM (local time) - 4ft (1.2m), 16s period with SE 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 Tuesday (Jul 07) at 3PM. The primary swell is predicted to be 1.2m and 16s period with a secondary swell of 1.4m and 8s. 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 4.5m 17s and forecast to arrive on Saturday (Jul 11) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 16s period and expected on Saturday (Jul 11) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 7th Jul) | 4ft (1.2m) 16s |
| Best Surf | 3AM (Sat 11th Jul) | 15ft (4.5m) 17s |
| Most Powerful | 3AM (Sat 11th Jul) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Hey mates, Rusty here again, with a look at what’s coming in our local stretch at Monabe Rivermouth over the next couple weeks. This is a river mouth break that’s heavily sheltered; when it works, it’s beautiful, but it’s not often.
First off, it’s dead quiet to start. Tuesday morning is a write-off – light onshore breeze, wave energy reading a measly 771, and the water temp is about `77°F`, which feels a smidge cool for summer. No reason to get wet.
Then Tuesday afternoon shows some life: glassy surface, 1.2m (4ft) swell from the southeast with a long 16-second period. It’s tempting, but this break ‘rarely breaks’ – so you’re rolling the dice.
The prime window is Thursday the 9th and Friday the 10th. Thursday morning glassy, offshore wind, and a punchy 3.0m (10ft) SSE swell with a big energy punch (4514). This is big, powerful, and for experienced surfers only. Friday morning is even better: 3.0m (10ft) south swell, 16-second intervals, glassy, with energy hitting 7926. That’s dynamite. Crowds are possible, so be early.
Saturday the 11th is still pumping in the morning with a 4.5m (15ft) south swell and glassy conditions – energy over 10,000 – but that’s full-on big-wave territory, experts only. Then it flatlines Saturday afternoon.
From Sunday the 12th, it goes tiny. Waves below knee-high, energy dropping to double digits. That flat spell runs nearly a week.
Later on, there’s a glimmer on Sunday the 19th: 2.4m (8ft) from the east-southeast, glassy, and a solid 2052 energy reading. It’s a decent cleanup session for those ready. Monday the 20th still has 1.9m (6ft) and clean conditions, though the period drops off a bit.
So your real window is tight: Thursday 9th through Saturday 11th is the only true standout. The rest of the month is mostly waiting on that next small pulse around the 19th.
That’s it from me – Rusty.
Short Range ForecastSome drizzle, heaviest during Tue morning. Warm (max 27°C on Thu morning, min 23°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Sat night. Warm (max 27°C on Fri morning, min 23°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | |||||||||||||||
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 13 | SE 16 | SE 16 | SE 16 | SE 15 | SE 15 | SSE 15 | SSE 15 | SSE 15 | S 16 | S 17 | S 17 | S 17 | SSW 16 | SE 12 | SE 12 | ESE 9 | ESE 9 | SE 10 | E 9 | E 9 |
Wave Graph | |||||||||||||||||||||
459 | 710 | 1707 | 2888 | 1825 | 3075 | 3818 | 4376 | 4636 | 4757 | 10851 | 11839 | 10806 | 0 | 23 | 22 | 28 | 28 | 26 | 26 | 25 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | on | cross-on | cross-off | glassy | on | off | glassy | on | glassy | glassy | on | glassy | glassy | cross-on | off | glassy | on | glassy |
High Tide | 10:22AM1.43m | 10:58PM1.62m | 11:42AM1.36m | 11:45PM1.60m | 1:23PM1.36m | 00:42AM1.59m | 3:02PM1.45m | 1:48AM1.61m | 4:18PM1.58m | 2:54AM1.66m | 5:16PM1.70m | 3:56AM1.73m | 6:05PM1.79m | ||||||||
Low Tide | 4:25PM0.67m | 5:34AM0.68m | 5:20PM0.83m | 6:45AM0.58m | 6:35PM0.98m | 7:58AM0.45m | 8:06PM1.07m | 9:06AM0.29m | 9:29PM1.09m | 10:07AM0.13m | 10:35PM1.06m | 11:01AM-0.00m | 11:28PM1.00m | ||||||||
5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | |
— | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 2 | — | 1 | — | 1 | — |
Temp °C | 24 | 24 | 24 | 25 | 26 | 24 | 27 | 26 | 25 | 27 | 26 | 25 | 27 | 27 | 24 | 27 | 27 | 25 | 28 | 28 | 26 |
Feels °C | 28 | 28 | 28 | 28 | 29 | 28 | 30 | 29 | 30 | 31 | 29 | 30 | 30 | 31 | 28 | 30 | 30 | 30 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 13 | E 8 | SE 16 | SE 16 | SE 15 | SE 15 | SSE 15 | SSE 15 | SSE 15 | S 16 | S 17 | S 17 | S 17 | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 10 |
459 | 245 | 1707 | 2888 | 1825 | 3075 | 3818 | 4376 | 4636 | 4757 | 10851 | 11839 | 10806 | 10137 | 7996 | 3203 | 1872 | 969 | 657 | 561 | 385 | |
Swell 2 Height (m) Direction Period (s) | SE 18 | SE 16 | E 8 | SSE 18 | SSE 18 | SSE 19 | S 21 | E 8 | E 8 | S 18 | SSW 20 | — | — | — | SE 12 | E 9 | ESE 9 | ESE 9 | E 9 | E 9 | E 9 |
194 | 710 | 163 | 883 | 1274 | 621 | 696 | 65 | 49 | 3169 | 2667 | — | — | — | 23 | 16 | 28 | 28 | 26 | 26 | 25 | |
Swell 3 Height (m) Direction Period (s) | SSW 6 | SE 12 | — | — | — | — | — | — | E 8 | — | — | — | — | — | — | SE 12 | — | SE 11 | SE 10 | SE 10 | SE 10 |
25 | 228 | — | — | — | — | — | — | 66 | — | — | — | — | — | — | 22 | — | 18 | 26 | 17 | 17 | |
Wind waves Height (m) Direction Period (s) | ESE 7 | — | — | E 7 | ESE 7 | — | — | ESE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — |
118 | — | — | 147 | 93 | — | — | 87 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 20 | 0 | 0 | 20 | 20 | 0 | 0 | 75 | 0 | 0 | 50 | 0 | 0 | 75 | 20 | 9 | 42 | 9 | 9 | 42 | 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.










