Surf Forecasts:
Aha Rivermouth surf forecast from 22 Aug 2026:
- Most powerful swell: Tuesday 25 Aug, 12PM (local time) - 16ft (5.0m), 17s period, E swell with 13,772 kJ wave energy.
Best Forecast Surf Conditions for Aha Rivermouth this week:
The most powerful waves expected at Aha Rivermouth in the next 16 days are 5.0m 17s and forecast to arrive on Tuesday (Aug 25) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.5m 9s period and expected on Wednesday (Aug 26) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12PM (Tue 25th Aug) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s break it down for Aha Rivermouth. This 16-day outlook is a tough one, with a long dry spell at the beginning. There’s basically nothing worth paddling out for until we get deep into the forecast.
From Sunday the 23rd of August, it’s a dead loss. Tiny waves, then the swell pumps up to 20ft, but the wind is a monster – we’re talking gale force and worse. The 26th of August sees a 20ft swell with a violent storm, and the next day has a 13ft swell with a severe gale offshore. It’s just unsafe.
The end of August is flat or small, with cross-shore winds making everything choppy and weak. The wave energy is low, staying under 1000 (combined energy of all swells directed here between 89 and 839). Not worth a look.
The first real chance shows up on Tuesday the 1st of September. A clean 8ft east swell with a light onshore breeze, and the forecast gives it a little nod. It’s the first time we get a score above zero. But the swell direction is off for this break, which prefers northeast.
The only real highlight is Monday the 7th of September. The morning shows a massive 10ft east swell with a light onshore wind. The forecast actually flags it as “wind and tide favorable,” the best score in the whole run. But, and this is a big but, that size is predicted to be too big for this beach/jetty setup. That’s expert-only territory, and even then, it’s a mission. Crowds are possible here.
Honestly, for most of the 16 days, you’re better off doing something else. The one window for the brave and the skilled is that Monday the 7th of September. Water temp is about average for this time of year. Keep an eye on it, but don’t hold your breath.
- Rusty
Short Range ForecastLight rain (total 9mm), mostly falling on Sun night. Warm (max 29°C on Tue morning, min 27°C on Sat night). Winds increasing (moderate winds from the SE on Sat night, strong winds from the N by Tue afternoon). | Days 5-7 Weather SummaryHeavy rain (total 160mm), heaviest during Wed morning. Warm (max 29°C on Fri morning, min 26°C on Tue night). Winds decreasing (extremely windy from the W on Wed morning, light winds from the SE by Fri morning). | ||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
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 10 | ESE 4 | ESE 5 | ESE 12 | ESE 16 | ESE 15 | E 18 | E 17 | E 16 | ENE 15 | NW 12 | NW 11 | E 9 | E 10 | E 10 | ENE 16 | ENE 15 | ESE 8 | E 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 16 | 16 | 28 | 60 | 196 | 816 | 5458 | 11236 | 11856 | 10621 | 9596 | 3217 | 104 | 54 | 284 | 25 | 21 | 207 | 114 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-off | off | cross-off | cross | cross | cross | cross | cross | cross-on |
High Tide | 1:28AM1.52m | 5:43PM1.53m | 3:31AM1.54m | 6:01PM1.65m | 4:36AM1.64m | 6:20PM1.74m | 5:20AM1.76m | 6:39PM1.83m | 5:58AM1.87m | 6:59PM1.90m | 6:33AM1.97m | 7:20PM1.96m | |||||||
Low Tide | 9:56AM0.75m | 10:37PM1.33m | 10:52AM0.63m | 11:23PM1.21m | 11:30AM0.52m | 11:53PM1.09m | 12:02PM0.43m | 00:18AM0.96m | 12:31PM0.36m | 00:44AM0.82m | 1:00PM0.33m | 1:11AM0.69m | |||||||
 |  | |  |  | |  |  |  | |  | | | | | | | |  | |
 | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | 6:58 | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | 1 | — | — | 3 | 2 | 2 | — | — | 1 | 27 | 61 | 48 | 21 | 1 | 1 | — | — | 1 | — |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 28 |
Feels °C | 30 | 29 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 23 | 13 | 17 | 20 | 27 | 29 | 30 | 33 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 10 | SW 10 | SW 10 | SW 10 | ESE 16 | ESE 15 | E 18 | E 17 | E 16 | ENE 15 | E 12 | NW 11 | W 10 | WSW 11 | SW 12 | ENE 16 | SW 12 | SSW 12 | SSW 11 |
| kJ | 160 | 153 | 94 | 88 | 196 | 816 | 5458 | 11236 | 11856 | 10621 | 497 | 3217 | 1466 | 1304 | 1193 | 25 | 383 | 1358 | 750 |
Swell 2 Height (m) Direction Period (s) | ENE 9 | S 7 | S 7 | ESE 12 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | E 13 | E 11 | E 9 | E 10 | E 18 | — | ENE 15 | ENE 15 | E 8 |
| kJ | 16 | 39 | 27 | 60 | 50 | 39 | 39 | 40 | 59 | 39 | 511 | 182 | 104 | 54 | 6 | — | 21 | 42 | 114 |
Swell 3 Height (m) Direction Period (s) | SE 10 | ENE 9 | ENE 9 | ENE 10 | ESE 12 | ENE 10 | ENE 10 | — | — | — | NE 12 | SE 10 | ENE 13 | ENE 13 | E 10 | — | E 14 | E 14 | ENE 10 |
| kJ | 15 | 16 | 27 | 31 | 81 | 42 | 64 | — | — | — | 273 | 17 | 35 | 35 | 284 | — | 4 | 4 | 35 |
Wind waves Height (m) Direction Period (s) | SSE 8 | ESE 4 | ESE 5 | ESE 5 | E 6 | E 6 | ENE 8 | — | NNE 6 | N 8 | NW 12 | SW 8 | S 8 | S 9 | SSE 9 | S 11 | SSE 9 | ESE 8 | — |
| kJ | 102 | 16 | 28 | 22 | 61 | 106 | 266 | — | 205 | 1437 | 9596 | 2330 | 1741 | 1430 | 1496 | 2998 | 1203 | 207 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 595 | 70 | 70 | 70 | 70 | 70 | 40 | 40 | 749 | 664 | 693 | 673 | 693 | 693 | 801 | 595 | 68 | 60 | 12 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.
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