Surf Forecasts:
Aha Rivermouth surf forecast from 25 Sep 2026:
- Most powerful swell: Wednesday 30 Sep, 6AM (local time) - 16ft (5.0m), 12s period, ESE swell with 6,763 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 12s and forecast to arrive on Wednesday (Sep 30) at 6AM. 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 11s period and expected on Wednesday (Sep 30) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6AM (Wed 30th Sep) | 16ft (5.0m) 12s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Short Range ForecastModerate rain (total 15mm), heaviest on Sun night. Warm (max 28°C on Fri afternoon, min 27°C on Fri morning). Winds increasing (light winds from the E on Fri afternoon, fresh winds from the ESE by Sun night). | Days 4-6 Weather SummaryHeavy rain (total 53mm), heaviest during Wed morning. Warm (max 28°C on Mon morning, min 27°C on Tue night). Winds increasing (fresh winds from the ESE on Mon morning, gales from the ESE by Wed morning). | ||||||||||||||||||||
Friday 25 | Saturday 26 | Sunday 27 | Monday 28 | Tuesday 29 | Wednesday 30 | Thursday 1 | |||||||||||||||
AM | 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 10 | ENE 9 | SE 11 | SE 9 | SE 9 | SE 8 | ENE 8 | SE 7 | ENE 8 | E 7 | SE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | SE 11 | ESE 8 | SE 8 | SE 7 | SE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 18 | 17 | 60 | 188 | 164 | 196 | 14 | 144 | 23 | 245 | 3836 | 2743 | 5603 | 4391 | 3716 | 5745 | 4333 | 1082 | 567 | 362 | 314 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross | cross | cross | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-on |
High Tide | 6:16PM1.91m | 6:18AM1.97m | 6:39PM1.98m | 6:55AM2.05m | 7:04PM2.03m | 7:32AM2.07m | 7:30PM2.05m | 8:10AM2.03m | 7:59PM2.05m | 8:52AM1.93m | 8:29PM2.02m | 9:38AM1.79m | 9:03PM1.94m | ||||||||
Low Tide | 12:00PM0.44m | 00:16AM0.58m | 12:31PM0.42m | 00:45AM0.42m | 1:01PM0.45m | 1:16AM0.29m | 1:32PM0.51m | 1:50AM0.21m | 2:03PM0.62m | 2:27AM0.19m | 2:35PM0.75m | 3:08AM0.23m | 3:09PM0.90m | ||||||||
 | |  | |  |  | |  | | | | |  | | | | | | | |  | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:14 | — |
mm | — | — | 1 | — | 1 | 5 | 2 | — | 6 | 1 | 1 | 1 | — | 3 | 18 | 17 | 9 | 3 | 2 | 2 | 9 |
Temp °C | 27 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 28 | 31 | 30 | 31 | 31 | 31 | 30 | 29 | 29 | 27 | 26 | 25 | 22 | 22 | 21 | 21 | 21 | 22 | 24 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | ENE 10 | ENE 9 | SE 11 | SE 9 | SE 9 | SE 8 | ENE 8 | SSE 9 | S 11 | SSE 11 | SE 11 | ESE 11 | ESE 11 | ESE 11 | — | — | — | S 11 | SSW 10 | SSW 10 | SSW 11 |
| kJ | 18 | 17 | 60 | 188 | 164 | 196 | 14 | 516 | 1201 | 1659 | 2047 | 2743 | 3371 | 2931 | — | — | — | 1489 | 667 | 684 | 346 |
Swell 2 Height (m) Direction Period (s) | N 6 | SE 8 | ENE 9 | ENE 9 | SSE 11 | ENE 9 | — | ENE 8 | ENE 8 | — | — | — | — | — | — | — | — | — | — | — | S 8 |
| kJ | 2 | 3 | 16 | 16 | 23 | 16 | — | 14 | 23 | — | — | — | — | — | — | — | — | — | — | — | 104 |
Swell 3 Height (m) Direction Period (s) | SE 8 | N 5 | — | N 4 | ENE 9 | ENE 9 | — | ENE 8 | — | — | — | — | — | — | — | — | — | — | — | — | NW 9 |
| kJ | 3 | 2 | — | 1 | 16 | 26 | — | 13 | — | — | — | — | — | — | — | — | — | — | — | — | 3 |
Wind waves Height (m) Direction Period (s) | — | E 3 | E 3 | — | — | — | SE 8 | SE 7 | — | E 7 | SE 11 | — | ESE 11 | ESE 11 | ESE 11 | ESE 11 | SE 11 | ESE 8 | SE 8 | SE 7 | SE 7 |
| kJ | — | 2 | 2 | — | — | — | 236 | 144 | — | 245 | 3836 | — | 5603 | 4391 | 3716 | 5745 | 4333 | 1082 | 567 | 362 | 314 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1504 | 861 | 68 | 68 | 68 | 68 | 70 | 70 | 605 | 595 | 595 | 595 | 595 | 595 | 595 | 621 | 673 | 627 | 595 | 746 | 595 |
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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