Surf Forecasts:
Aha Rivermouth surf forecast from 20 Sep 2026:
- Best quality surf: Wednesday 23 Sep, 3AM (local time) - 3.5ft (1.0m), 8s period, N swell with cross-offshore winds.
- Most powerful swell: Monday 21 Sep, 12AM (local time) - 8ft (2.5m), 13s period, ENE swell with 2,338 kJ wave energy.
- Next surfable swell (1★+): Wednesday 23 Sep, 3AM (local time) - 3.5ft (1.0m), 8s period with N 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 Wednesday (Sep 23) at 3AM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.5m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 2.5m 13s and forecast to arrive on Monday (Sep 21) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.0m 15s period and expected on Sunday (Sep 27) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Wed 23rd Sep) | 3.5ft (1.0m) 8s |
| Best Surf | 3AM (Wed 23rd Sep) | 3.5ft (1.0m) 8s |
| Most Powerful | 12AM (Mon 21st Sep) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Sun afternoon. Warm (max 28°C on Sun afternoon, min 26°C on Sun night). Winds decreasing (fresh winds from the NNW on Sun night, calm by Wed morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sat morning, min 25°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | ||||||||||||||
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 14 | ENE 13 | ENE 12 | ENE 12 | NE 11 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 7 | N 7 | ENE 9 | SE 16 | SE 14 | SE 12 | SE 12 | SE 13 | ENE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2774 | 2338 | 970 | 550 | 298 | 195 | 160 | 157 | 127 | 98 | 82 | 39 | 24 | 17 | 66 | 228 | 437 | 773 | 1299 | 16 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | glassy | glassy | glassy | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross |
High Tide | 4:59PM1.41m | 11:56PM1.42m | 4:58PM1.53m | 3:08AM1.44m | 5:15PM1.64m | 4:18AM1.57m | 5:34PM1.74m | 5:04AM1.72m | 5:54PM1.83m | 5:42AM1.86m | 6:16PM1.91m | 6:18AM1.97m | 6:39PM1.98m | |||||||
Low Tide | 8:05PM1.39m | 9:04AM0.78m | 10:25PM1.25m | 10:10AM0.68m | 10:57PM1.10m | 10:53AM0.58m | 11:23PM0.93m | 11:28AM0.49m | 11:49PM0.75m | 12:00PM0.44m | 00:16AM0.58m | 12:31PM0.42m | 00:45AM0.42m | |||||||
 |  |  | | | |  | | | |  | | | | | | | | | | |
 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:19 | — |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 28 | 28 | 27 |
Feels °C | 28 | 27 | 25 | 25 | 25 | 26 | 26 | 26 | 29 | 30 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 31 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | ENE 14 | ENE 13 | ENE 12 | ENE 12 | NE 11 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 7 | N 7 | N 6 | SE 16 | SE 14 | SE 12 | SE 12 | SE 13 | SSE 14 |
| kJ | 2774 | 2338 | 970 | 550 | 298 | 195 | 160 | 157 | 127 | 98 | 82 | 39 | 24 | 7 | 66 | 228 | 437 | 773 | 1299 | 2412 |
Swell 2 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | S 8 | S 8 | ENE 11 | NE 11 | NE 10 | NE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 10 | ENE 10 | ENE 9 | NE 9 | NE 9 | ENE 9 |
| kJ | 12 | 5 | 5 | 5 | 5 | 157 | 117 | 49 | 33 | 20 | 19 | 18 | 17 | 17 | 18 | 18 | 16 | 21 | 21 | 16 |
Swell 3 Height (m) Direction Period (s) | ESE 18 | — | SE 10 | SE 10 | SE 10 | S 8 | S 8 | E 11 | ENE 11 | NE 9 | NE 8 | SE 8 | SE 8 | SE 9 | N 6 | N 5 | N 5 | — | NE 11 | — |
| kJ | 34 | — | 4 | 4 | 4 | 4 | 4 | 10 | 23 | 12 | 11 | 3 | 3 | 3 | 6 | 2 | 2 | — | 5 | — |
Wind waves Height (m) Direction Period (s) | N 7 | N 8 | N 8 | N 8 | N 8 | — | — | — | — | — | — | — | — | — | ESE 3 | E 3 | E 4 | — | — | — |
| kJ | 111 | 212 | 341 | 264 | 219 | — | — | — | — | — | — | — | — | — | 1 | 2 | 6 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 595 | 596 | 596 | 693 | 31 | 30 | 919 | 3 | 0 | 0 | 0 | 0 | 1316 | 683 | 90 | 68 | 68 | 68 | 68 | 70 |
Best forecast wave conditions in Okinawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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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