Surf Forecasts:
Aha Rivermouth surf forecast from 12 Aug 2026:
- Best quality surf: Thursday 13 Aug, 12AM (local time) - 2ft (0.6m), 10s period, ENE swell with glassy winds.
- Most powerful swell: Wednesday 19 Aug, 9PM (local time) - 6.5ft (2.0m), 7s period, E swell with 371 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 12AM (local time) - 2ft (0.6m), 10s period with ENE 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 Thursday (Aug 13) at 12AM. The primary swell is predicted to be 0.6m and 10s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 2.0m 7s and forecast to arrive on Wednesday (Aug 19) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 8s period and expected on Thursday (Aug 13) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 13th Aug) | 2ft (0.6m) 10s |
| Best Surf | 12AM (Thu 13th Aug) | 2ft (0.6m) 10s |
| Most Powerful | 9PM (Wed 19th Aug) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Short Range ForecastModerate rain (total 16mm), heaviest on Fri afternoon. Warm (max 28°C on Thu morning, min 26°C on Wed afternoon). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 16mm), heaviest on Sun morning. Warm (max 28°C on Sat afternoon, min 27°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Wed 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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) | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | E 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 130 | 77 | 114 | 92 | 57 | 32 | 35 | 28 | 93 | 90 | 90 | 78 | 78 | 104 | 102 | 75 | 75 | 135 | 72 | 92 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | glassy | glassy | glassy | cross-off | glassy | glassy | glassy | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 7:07PM1.97m | 6:38AM2.14m | 7:37PM2.02m | 7:20AM2.16m | 8:06PM2.05m | 8:00AM2.13m | 8:34PM2.06m | 8:38AM2.05m | 9:03PM2.03m | 9:16AM1.92m | 9:31PM1.98m | 9:55AM1.76m | 9:58PM1.91m | |||||||
Low Tide | 00:47AM0.79m | 1:14PM0.15m | 1:25AM0.67m | 1:49PM0.20m | 2:01AM0.58m | 2:21PM0.30m | 2:37AM0.53m | 2:51PM0.43m | 3:14AM0.53m | 3:20PM0.59m | 3:52AM0.57m | 3:47PM0.76m | ||||||||
 |  |  | |  | | |  | | | | | | |  | | | | | | |
 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — |
 | 7:06 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — |
mm | 3 | 1 | — | 1 | — | 2 | 6 | 1 | 2 | 2 | 3 | 5 | 4 | 2 | — | — | — | — | 1 | 1 |
Temp °C | 26 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 28 |
Feels °C | 30 | 32 | 33 | 33 | 33 | 33 | 32 | 33 | 33 | 32 | 32 | 31 | 30 | 29 | 29 | 29 | 27 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 |
| kJ | 123 | 89 | 89 | 66 | 66 | 68 | 68 | 47 | 65 | 90 | 90 | 78 | 78 | 104 | 102 | 75 | 75 | 135 | 72 | 75 |
Swell 2 Height (m) Direction Period (s) | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | WNW 6 | ENE 11 | S 8 | SSW 9 | SW 9 | S 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | S 7 |
| kJ | 130 | 77 | 114 | 92 | 57 | 32 | 35 | 13 | 93 | 46 | 53 | 36 | 31 | 40 | 38 | 26 | 29 | 29 | 19 | 17 |
Swell 3 Height (m) Direction Period (s) | SW 9 | N 8 | N 7 | N 7 | SW 8 | SW 8 | SW 8 | ENE 9 | E 5 | E 5 | S 8 | S 8 | SW 9 | S 8 | S 8 | S 7 | S 7 | S 7 | S 7 | SW 9 |
| kJ | 27 | 33 | 26 | 15 | 23 | 25 | 24 | 28 | 8 | 8 | 32 | 29 | 36 | 20 | 18 | 17 | 9 | 9 | 17 | 12 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | E 5 | ESE 5 | ESE 5 | ESE 5 | ESE 5 | ESE 5 | ESE 5 | SSE 6 | E 5 | E 6 |
| kJ | — | — | — | — | — | — | — | — | — | — | 16 | 33 | 33 | 50 | 47 | 33 | 31 | 20 | 67 | 92 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 17 | 17 | 17 | 0 | 12 | 12 | 12 | 12 | 12 | 70 | 70 | 12 | 70 | 70 | 68 |
Best forecast wave conditions in Okinawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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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.
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