Surf Forecasts:
Monabe Rivermouth surf forecast from 24 Jul 2026:
- Best quality surf: Monday 27 Jul, 6PM (local time) - 2.5ft (0.7m), 9s period, S swell with glassy winds.
- Most powerful swell: Saturday 25 Jul, 6AM (local time) - 1.5ft (0.4m), 16s period, SE swell with 93 kJ wave energy.
- Next surfable swell (1★+): Monday 27 Jul, 6PM (local time) - 2.5ft (0.7m), 9s period with S 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 27) at 6PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.6m and 10s. 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 0.4m 16s and forecast to arrive on Saturday (Jul 25) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Wednesday (Jul 29) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 27th Jul) | 2.5ft (0.7m) 9s |
| Best Surf | 6PM (Mon 27th Jul) | 2.5ft (0.7m) 9s |
| Most Powerful | 6AM (Sat 25th Jul) | 1.5ft (0.4m) 16s |
Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s coming up at Monabe Rivermouth.
Honestly, the next week and a half is a bit of a write-off. The surf that’s on offer is tiny and weak, and the conditions are just ordinary. You’re looking at a long stretch of nothing really happening from the 25th of July right through to the 3rd of August. The swell is barely a ripple, mostly around 1 foot to 2 feet, and the energy is pitiful – we’re talking values like 138 all the way down to 22. It’s flat, it’s weak, and it’s not worth paddling out for.
But then, from the 4th of August, things start to get interesting. The 5th of August, Wednesday morning, is the real standout. We’ve got a solid 15 foot swell lighting up the river mouth, coming from the ESE. The period is a very long 18 seconds, which is proper groundswell energy – the combined energy of all swells is a massive 12972. The wind is glassy, calm as can be, so expect absolutely clean, smooth conditions. This is a big, powerful swell. At 15 feet, it’s definitely for experienced surfers only. The water temperature is about average for this time of year.
Then, the 6th of August, Thursday morning, is the absolute peak. We’re talking 23 feet of swell from the E, with a period of 18 seconds and a combined energy reading of 31267. The wind is glassy again. This is exceptional, heavy, powerful surf. Again, this is expert-only territory. The river mouth setup could be interesting with that long period, it might barrel, but it’s going to be a beast.
After that, the swell drops fast. The 7th of August Friday morning sees a much smaller 5 foot ESE swell, but the wind is glassy. By the 8th and 9th, the wind is better but the swell is messy and short period.
So, the only two days to really get excited about are the mornings of the 5th and 6th of August. If you’re a confident, experienced surfer, those are the windows. The 5th is a big, clean groundswell, and the 6th is an absolute monster. For everyone else, the first week is a bust.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 31°C on Sat morning, min 27°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 34°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | ||||||||||||||
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 16 | SE 16 | SE 16 | SE 16 | SE 15 | SE 15 | SE 14 | SE 14 | S 9 | SE 14 | SE 10 | ESE 10 | ESE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 42 | 91 | 90 | 87 | 78 | 76 | 74 | 72 | 76 | 54 | 51 | 67 | 65 | 48 | 48 | 38 | 36 | 35 | 35 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | glassy | on | off | glassy | glassy | off | glassy | on | off | glassy | on | cross-off | cross-off | cross-off | off | glassy | on | glassy |
High Tide | 1:37AM1.44m | 4:53PM1.44m | 2:50AM1.47m | 5:27PM1.53m | 3:48AM1.54m | 5:56PM1.60m | 4:35AM1.62m | 6:23PM1.66m | 5:15AM1.70m | 6:49PM1.71m | 5:52AM1.76m | 7:14PM1.74m | |||||||
Low Tide | 9:22AM0.50m | 9:48PM1.18m | 10:13AM0.41m | 10:39PM1.11m | 10:54AM0.31m | 11:15PM1.04m | 11:31AM0.23m | 11:47PM0.96m | 12:04PM0.17m | 00:17AM0.88m | 12:35PM0.14m | 00:48AM0.81m | |||||||
 |  | |  |  |  | | | | | | | | | | | | | | |
 | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — |
 | 7:10 | — | 7:09 | — | — | 7:09 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — |
mm | — | — | — | — | — | 1 | — | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 31 | 31 | 28 | 31 | 30 | 28 | 30 | 30 | 27 | 30 | 30 | 28 | 33 | 34 | 28 | 29 | 30 | 26 |
Feels °C | 34 | 35 | 35 | 32 | 35 | 34 | 33 | 34 | 34 | 32 | 34 | 34 | 32 | 35 | 36 | 30 | 31 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | S 9 | S 8 | S 8 | S 9 | S 9 | S 8 | ESE 10 | SSW 5 | SE 10 | SE 10 | SSW 5 | ESE 10 | SSW 7 | ESE 9 |
| kJ | 42 | 41 | 37 | 49 | 50 | 56 | 49 | 66 | 76 | 54 | 51 | 67 | 20 | 48 | 48 | 17 | 36 | 21 | 35 |
Swell 2 Height (m) Direction Period (s) | SE 16 | SE 16 | SE 16 | SE 16 | S 9 | SE 11 | SE 11 | SE 10 | ESE 10 | SE 10 | SE 10 | S 8 | ESE 10 | SSW 5 | SSW 8 | ESE 10 | SW 5 | ESE 9 | SW 4 |
| kJ | 42 | 91 | 90 | 87 | 41 | 55 | 57 | 37 | 68 | 51 | 50 | 49 | 65 | 9 | 21 | 38 | 8 | 35 | 5 |
Swell 3 Height (m) Direction Period (s) | E 9 | E 9 | S 8 | S 8 | SE 15 | SE 15 | SE 14 | SE 14 | SE 14 | SE 14 | SE 13 | SE 13 | SSW 8 | SSW 8 | SE 13 | SSW 8 | SSW 8 | ESE 14 | SSW 7 |
| kJ | 15 | 6 | 10 | 10 | 78 | 76 | 74 | 72 | 71 | 47 | 28 | 28 | 22 | 22 | 26 | 12 | 11 | 20 | 10 |
Wind waves Height (m) Direction Period (s) | — | — | — | WSW 4 | — | — | — | NE 3 | E 3 | — | SSW 3 | SSW 3 | SW 5 | — | SSW 5 | NW 3 | NW 3 | — | — |
| kJ | — | — | — | 2 | — | — | — | 1 | 1 | — | 1 | 2 | 28 | — | 10 | 3 | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 9 | 9 | 42 | 9 | 9 | 9 | 9 | 9 | 47 | 9 | 9 | 42 | 9 | 9 | 9 | 9 | 9 | 638 | 20 |
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.
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