Surf Forecasts:
Monabe Rivermouth surf forecast from 5 Jul 2026:
- Best quality surf: Friday 10 Jul, 9PM (local time) - 15ft (4.5m), 18s period, S swell with glassy winds.
- Most powerful swell: Friday 10 Jul, 9PM (local time) - 15ft (4.5m), 18s period, S swell with 13,569 kJ wave energy.
- Next surfable swell (1★+): Monday 6 Jul, 12PM (local time) - 2ft (0.6m), 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 Monday (Jul 06) at 12PM. The primary swell is predicted to be 0.6m and 16s 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 4.5m 18s and forecast to arrive on Friday (Jul 10) at 9PM. Winds are predicted to be glassy 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 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Mon 6th Jul) | 2ft (0.6m) 16s |
| Best Surf | 9PM (Fri 10th Jul) | 15ft (4.5m) 18s |
| Most Powerful | 9PM (Fri 10th Jul) | 15ft (4.5m) 18s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, Rusty here. Let's have a look at what we've got cookin' for Monabe Rivermouth.
Honestly, for the first week and a half, it's a bit of a slow grind. The swell is tiny and the surf quality is rated as poor through the 10th of July, so don't get your hopes up for anything special. The water temp is 25°, which is a bit colder than normal for this time of year.
After a few days of nothing, things finally kick into gear on the morning of Wednesday, the 8th of July. A solid 8ft SE groundswell with a very long 17-second period rolls in, and the wave energy hits 4257 (moderate to strong). The wind is glassy from the SSE, so expect excellent, clean surf for experienced surfers only. This is a proper, punchy groundswell that will be breaking with a lot of power. Keep in mind, with that super-long period, it might be a bit straight at the river mouth, but with glassy conditions, it's going to be a standout session for the crew who can handle it.
The Thursday morning (9th July) looks even bigger, with 10ft SSE swell and glassy wind, so another top shelf morning for the experienced crew. But the true highlight, the real standout, is the Friday morning of the 10th of July. We're looking at a 13ft S swell, with a 17-second period, and glassy wind. The wave energy is a whopping 10405 (strong to very strong). That is serious, powerful surf. It's strictly for experts only, but if you're one of them, that's the session to circle on the calendar. The Rivermouth is rarely breaks, so when it lines up like this, you have to be on it, and yes, crowds are possible.
After that Friday, the swell drops off a cliff on the 11th and we're back to flat, poor conditions through to the 20th. There's a few mornings with small, surfable waves around the 4ft to 4ft mark with glassy winds on the 17th, 18th, 19th, and 20th, but they're described as very ordinary. Not worth getting too excited about.
So, the call: The morning of Friday, 10th of July is the absolute standout. Massive, powerful S swell, glassy, and for experts only. The morning of the 8th and 9th are excellent runners-up. For the rest? Just find a longboard and a glassy morning, or wait for the next proper swell.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Sun afternoon. Warm (max 27°C on Mon afternoon, min 24°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri morning, min 21°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | |||||||||||||||
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 11 | SE 9 | ESE 8 | SE 16 | SE 14 | SE 13 | SE 13 | SE 16 | SE 16 | SE 17 | SE 17 | SSE 16 | SSE 16 | SSE 16 | S 16 | S 17 | S 17 | S 18 | SSW 17 | SSW 17 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 19 | 19 | 14 | 157 | 305 | 398 | 519 | 636 | 1852 | 4185 | 4959 | 3549 | 4944 | 5572 | 6251 | 10405 | 11889 | 13559 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | glassy | glassy | glassy | off | glassy | on | glassy | glassy | on | glassy | glassy | on | off | glassy | on | cross-off | glassy | glassy | glassy |
High Tide | 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 | 4:18PM1.58m | 2:54AM1.66m | ||||||||
Low Tide | 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 | 9:06AM0.29m | 9:29PM1.09m | ||||||||
 |  |  |  |  |  |  | |  | | | | |  | | | | |  | | | |
 | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — |
 | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | — | 7:16 | — |
mm | 1 | 15 | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | 19 | 11 | — |
Temp °C | 25 | 25 | 24 | 25 | 27 | 25 | 26 | 25 | 24 | 25 | 25 | 24 | 26 | 26 | 23 | 27 | 27 | 25 | 24 | 25 | 23 |
Feels °C | 29 | 30 | 28 | 30 | 32 | 29 | 30 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 27 | 30 | 30 | 30 | 28 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SE 13 | SE 13 | SE 16 | SE 16 | SE 17 | SE 17 | SSE 16 | SSE 16 | SSE 16 | S 16 | S 17 | S 17 | S 18 | SSW 17 | SSW 17 | SSW 16 |
| kJ | 80 | 47 | 31 | 32 | 58 | 398 | 519 | 636 | 1852 | 4185 | 4959 | 3549 | 4944 | 5572 | 6251 | 10405 | 11889 | 13559 | 11932 | 10360 | 5774 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | SE 9 | ESE 8 | SE 16 | SE 14 | SSW 6 | SSW 6 | SE 12 | E 8 | — | E 8 | SSE 19 | S 21 | S 18 | E 8 | — | — | — | — | — | — |
| kJ | 15 | 19 | 14 | 157 | 305 | 49 | 33 | 228 | 120 | — | 100 | 1129 | 873 | 2242 | 84 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SE 11 | S 8 | E 4 | E 8 | E 8 | E 8 | SE 18 | SSW 6 | SSE 21 | — | — | E 8 | — | E 8 | E 8 | — | — | — | — | — | — |
| kJ | 19 | 5 | 1 | 21 | 20 | 18 | 194 | 13 | 578 | — | — | 105 | — | 160 | 84 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | E 7 | E 7 | — | E 8 | — | — | E 8 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 54 | 100 | — | 72 | — | — | 113 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 9 | 42 | 9 | 0 | 0 | 0 | 75 | 0 | 0 | 50 | 0 | 0 | 75 | 0 | 0 | 387 | 0 | 20 | 20 | 20 |
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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