Surf Forecasts:
Aha Rivermouth surf forecast from 20 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 3PM (local time) - 13ft (4.0m), 15s period, E swell with onshore winds.
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 15ft (4.5m), 17s period, E swell with 10,655 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 3PM (local time) - 13ft (4.0m), 15s period with E swell.
Best Forecast Surf Conditions for Aha Rivermouth this week:
The surf forecast for Aha Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 25) at 3PM. The primary swell is predicted to be 4.0m and 15s period with a secondary swell of 2.2m and 7s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 4.5m 17s and forecast to arrive on Tuesday (Aug 25) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.0m 9s period and expected on Wednesday (Aug 26) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 25th Aug) | 13ft (4.0m) 15s |
| Best Surf | 3PM (Tue 25th Aug) | 13ft (4.0m) 15s |
| Most Powerful | 9AM (Tue 25th Aug) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright folks, it's Rusty here. Let's have a look at the surf over the next couple of weeks at Aha Rivermouth.
Right off the bat, I gotta tell you, it’s a rough stretch. The whole window is pretty grim, with nothing really worth paddling out for. There’s a big gap of poor conditions right through until late August. The first time there’s even a sniff of something rideable is around Wednesday, August 26th, but even then it’s a struggle. From the 20th right through to the 25th, it’s a write-off with strong, messy cross-shore winds and lumpy, blown-out slop. The wave energy on the 24th is massive (1424 to 3089), but it's all show and no go with that wind.
So, a standout? There aren’t any. The only spot that even gets a "marginal" nod is the Wednesday afternoon, August 26th. Swell drops to about 1.8m from the ENE with a moderate cross-shore breeze. It’s not clean, but it’s the best of a bad bunch. Still, with a score that low, I wouldn’t be rushing down there. The crowd profile says "sometimes", so you might have company even for this, but to be honest, it’s not worth fighting for.
The water temp is sitting around 29°C, which is about average for the time of year, so at least you won’t be cold while you’re sitting there staring at the chop.
After that brief flicker, it goes straight back to poor. The winds pick up again, and we get a run of cross-onshore stuff that just won't let up. By the time we hit September, it’s actually getting dangerous with near gale and storm force winds forecast for the 4th, making it a total mess.
Honestly, save your energy on this one. It’s a long, flat, and windy outlook for Aha Rivermouth.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Thu night. Warm (max 28°C on Thu night, min 27°C on Thu night). Mainly strong winds. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Sun night. Warm (max 29°C on Wed afternoon, min 27°C on Tue night). Winds decreasing (fresh winds from the E on Mon morning, calm by Tue night). | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 7 | ESE 6 | SSE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ESE 6 | ESE 6 | ESE 6 | ESE 17 | E 17 | E 18 | E 17 | E 15 | NNE 13 | NNW 11 | E 11 | E 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 335 | 213 | 0 | 16 | 16 | 8 | 16 | 115 | 143 | 140 | 1045 | 2413 | 5891 | 10655 | 7608 | 5880 | 1846 | 244 | 76 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | on | cross-on |
High Tide | 10:59PM1.71m | 1:42PM1.30m | 11:43PM1.60m | 5:29PM1.41m | 1:28AM1.52m | 5:43PM1.53m | 3:31AM1.54m | 6:01PM1.65m | 4:36AM1.64m | 6:20PM1.74m | 5:20AM1.76m | 6:39PM1.83m | |||||||
Low Tide | 6:35AM0.81m | 4:55PM1.26m | 8:22AM0.83m | 7:56PM1.39m | 9:56AM0.75m | 10:37PM1.33m | 10:52AM0.63m | 11:23PM1.21m | 11:30AM0.52m | 11:53PM1.09m | 12:02PM0.43m | 00:18AM0.96m | |||||||
 |  | | |  | | | | | | | |  |  | |  | | |  | |
 | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — |
 | 6:59 | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — |
mm | 2 | 2 | 1 | 1 | — | 2 | 4 | — | — | 2 | 2 | 1 | — | — | — | — | — | — | — |
Temp °C | 28 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 |
Feels °C | 29 | 24 | 24 | 27 | 27 | 27 | 28 | 28 | 28 | 29 | 28 | 28 | 29 | 29 | 31 | 31 | 33 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | SW 9 | S 8 | SW 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | SSW 9 | SSW 9 | SSW 9 | ESE 17 | E 17 | E 18 | E 17 | E 15 | SSW 9 | NNW 11 | WNW 10 | W 10 |
| kJ | 3 | 161 | 4 | 8 | 16 | 8 | 16 | 302 | 181 | 140 | 1045 | 2413 | 5891 | 10655 | 7608 | 35 | 1846 | 2386 | 1231 |
Swell 2 Height (m) Direction Period (s) | SW 9 | SW 8 | WSW 10 | ENE 9 | — | ENE 9 | E 13 | ESE 14 | ESE 13 | ESE 12 | S 8 | SSW 9 | S 8 | SSW 9 | SSW 9 | S 9 | NW 10 | E 11 | E 9 |
| kJ | 12 | 25 | 10 | 16 | — | 8 | 14 | 41 | 35 | 58 | 64 | 132 | 45 | 46 | 43 | 6 | 450 | 244 | 76 |
Swell 3 Height (m) Direction Period (s) | ESE 10 | ESE 11 | — | — | — | — | E 16 | ESE 14 | E 14 | ESE 15 | ESE 13 | ENE 10 | ENE 10 | — | — | SE 10 | E 11 | SE 10 | E 11 |
| kJ | 10 | 11 | — | — | — | — | 5 | 40 | 16 | 78 | 67 | 42 | 52 | — | — | 4 | 195 | 17 | 37 |
Wind waves Height (m) Direction Period (s) | SE 7 | ESE 6 | SSE 8 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | ESE 6 | ESE 6 | ESE 6 | E 6 | E 7 | ENE 7 | — | N 7 | NNE 13 | W 9 | SW 8 | S 8 |
| kJ | 335 | 213 | 1151 | 1502 | 1098 | 990 | 522 | 115 | 143 | 140 | 159 | 173 | 145 | — | 442 | 5880 | 2267 | 1129 | 822 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 84 | 595 | 595 | 595 | 595 | 664 | 595 | 595 | 595 | 595 | 693 | 595 | 66 | 40 | 40 | 40 | 3 | 40 | 12 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Aha Rivermouth surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Aha Rivermouth Surf forecast
The above surf forecast table for Aha Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Aha Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Aha 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 (Aha 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 Aha 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.
Aha Rivermouth is 31 km (19 miles) from the city of Okinawa. If you plan a holiday in Okinawa, look for hotels and other accommodation in Okinawa. Okinawa has rooms for a wide range of budgets as well as car hire and transport links.
Nearest