
Surf Forecasts:
Monabe Rivermouth surf forecast from 4 Jul 2026:
- Best quality surf: Friday 10 Jul, 3AM (local time) - 15ft (4.5m), 17s period, S swell with cross-offshore winds.
- Most powerful swell: Friday 10 Jul, 6PM (local time) - 16ft (5.0m), 18s period, S swell with 16,033 kJ wave energy.
- Next surfable swell (1★+): Monday 6 Jul, 6PM (local time) - 3ft (0.9m), 14s 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 Monday (Jul 06) at 6PM. The primary swell is predicted to be 0.9m and 14s period. 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 5.0m 18s and forecast to arrive on Friday (Jul 10) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.0m 17s period and expected on Saturday (Jul 11) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 6th Jul) | 3ft (0.9m) 14s |
| Best Surf | 3AM (Fri 10th Jul) | 15ft (4.5m) 17s |
| Most Powerful | 6PM (Fri 10th Jul) | 16ft (5.0m) 18s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Righto, let's have a look at what's on the cards for Monabe Rivermouth. It's a tricky little river mouth setup that rarely breaks, so when it does, you gotta be on it. The water's sitting at 77°, pretty much where you'd expect for this time of year.
Truth be told, the next week and a half looks mostly frustrating. We've got a long quiet spell from now right through to the end of Saturday the 6th of July. The swell that's around is tiny – 1.0ft to 2ft – and mostly from the ESE or SE with weak energy (30 to 168). There's a moment on Sunday morning the 5th with 1ft SE swell at 11 seconds (62 combined energy) and glassy conditions, but it's just too small to get excited about. Monday morning the 6th has 2ft, 16-second SE groundswell (168 energy) and glassy, but again, it's barely breaking.
Then things ramp up in a big way. Tuesday the 7th of July morning: the swell jumps to 3ft, but the period is a massive 18 seconds from the SE, and the combined energy is up at 1010 – that's moderate energy with very long-period groundswell. The wind is glassy. This is the first real standout. Long-period waves on a river mouth can be a bit straight, but if the banks are right, the sets will have real shape and power.
Wednesday the 8th of July morning is where it gets serious for the experienced crew. We're looking at 10ft of SE swell at 17 seconds, with glassy conditions and the combined energy roaring at 5040. That is strong wave energy. This is proper, heavy, expert-only territory. The river mouth will be handling a lot of water.
The absolute pick of the entire outlook is Friday the 10th of July morning. The swell hits 15ft from the S at 18 seconds, with glassy conditions and a massive 13289 combined energy – that's very strong wave energy. That is a massive, long-period south groundswell. For an experienced surfer who knows the river mouth's ins and outs, this could be an epic, heavy session. The afternoon has 16ft, but the wind goes onshore and questionable, so the morning glass-off is the window.
After that, the 11th sees nothing, then we're back to small, weak, and ordinary for the rest of the run. A few days of 1.0ft to 3ft junk from the 12th to the 19th of July, with poor surf conditions and weak energy (mostly under 100). Nothing worth paddling out for.
All in all, keep your eyes on the morning of Tuesday the 7th for a taste of quality, but the true standouts for the big dogs are the mornings of Wednesday the 8th and Friday the 10th of July. That Friday morning glass-off with the 15ft south groundswell is the one to circle on the calendar – promising, but with a long-range forecast so stay tuned.
Rusty.
Short Range ForecastModerate rain (total 19mm), heaviest on Sun afternoon. Warm (max 27°C on Mon morning, min 22°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Wed afternoon. Warm (max 27°C on Tue morning, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | |||||||||||||||
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) | ESE 9 | ESE 9 | ESE 9 | SE 11 | SE 9 | SE 10 | SE 16 | SE 14 | SE 13 | SE 18 | SE 17 | SE 17 | SE 17 | SE 17 | SSE 16 | SSE 16 | SSE 16 | SSE 17 | S 18 | S 18 | S 18 |
Wave Graph | |||||||||||||||||||||
16 | 16 | 15 | 30 | 19 | 25 | 157 | 206 | 398 | 510 | 2117 | 3761 | 5040 | 6179 | 4312 | 6957 | 6988 | 8148 | 13289 | 15209 | 14634 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | glassy | cross-on | glassy | glassy | on | off | glassy | on | glassy | glassy | cross-on | cross-off | cross-on | cross-on | cross-off | glassy | on | off |
High Tide | 9:12PM1.66m | 8:32AM1.60m | 9:43PM1.66m | 9:21AM1.52m | 10:18PM1.64m | 10:22AM1.43m | 10:58PM1.62m | 11:42AM1.36m | 11:45PM1.60m | 1:23PM1.36m | 00:42AM1.59m | 3:02PM1.45m | 1:48AM1.61m | ||||||||
Low Tide | 2:30PM0.30m | 2:55AM0.84m | 3:04PM0.40m | 3:40AM0.80m | 3:41PM0.52m | 4:32AM0.75m | 4:25PM0.67m | 5:34AM0.68m | 5:20PM0.83m | 6:45AM0.58m | 6:35PM0.98m | 7:58AM0.45m | 8:06PM1.07m | ||||||||
4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — | |
— | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | |
mm | 6 | 2 | — | — | 8 | 2 | — | 1 | — | — | — | — | — | 1 | — | — | 2 | — | — | — | — |
Temp °C | 23 | 24 | 24 | 24 | 24 | 24 | 27 | 27 | 25 | 27 | 26 | 24 | 26 | 26 | 25 | 27 | 27 | 24 | 26 | 26 | 24 |
Feels °C | 26 | 28 | 28 | 28 | 27 | 28 | 31 | 31 | 29 | 30 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 27 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 5 | ESE 9 | SSW 6 | SSW 6 | SSW 6 | E 5 | SSW 6 | SE 14 | SE 13 | SE 14 | SE 17 | SE 17 | SE 17 | SE 17 | SSE 16 | SSE 16 | SSE 16 | SSE 17 | S 18 | S 18 | S 18 |
5 | 16 | 49 | 66 | 33 | 17 | 51 | 206 | 398 | 500 | 2117 | 3761 | 5040 | 6179 | 4312 | 6957 | 6988 | 8148 | 13289 | 15209 | 14634 | |
Swell 2 Height (m) Direction Period (s) | ESE 9 | SSW 5 | ESE 9 | SE 11 | SE 9 | SSW 6 | SE 16 | SSW 6 | SSW 6 | SE 18 | SSW 6 | — | — | — | SSE 19 | — | — | S 21 | — | — | — |
16 | 5 | 15 | 30 | 19 | 24 | 157 | 31 | 47 | 510 | 22 | — | — | — | 1314 | — | — | 1980 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | ESE 12 | ESE 12 | SSE 9 | ESE 9 | S 8 | SE 10 | E 5 | E 9 | E 5 | SW 6 | E 7 | — | — | — | — | — | — | — | — | — | — |
14 | 14 | 7 | 15 | 5 | 25 | 11 | 59 | 27 | 54 | 26 | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | E 4 | E 5 | ESE 5 | — | — | — | — | — | — | — | — | — | — | E 8 | E 8 | — | — | — | — |
— | — | 12 | 17 | 18 | — | — | — | — | — | — | — | — | — | — | 84 | 42 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 288 | 47 | 9 | 9 | 235 | 20 | 9 | 42 | 0 | 0 | 77 | 0 | 0 | 20 | 0 | 20 | 531 | 0 | 0 | 75 | 0 |
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.










