Surf Forecasts:
Aha Rivermouth surf forecast from 2 Sep 2026:
- Best quality surf: Thursday 3 Sep, 9PM (local time) - 5ft (1.6m), 10s period, E swell with offshore winds.
- Most powerful swell: Thursday 3 Sep, 12AM (local time) - 10ft (3.0m), 10s period, E swell with 1,792 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 9PM (local time) - 5ft (1.6m), 10s 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 Thursday (Sep 03) at 9PM. The primary swell is predicted to be 1.6m and 10s period with a secondary swell of 0.6m and 6s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 3.0m 10s and forecast to arrive on Thursday (Sep 03) at 12AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 11s period and expected on Friday (Sep 04) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 3rd Sep) | 5ft (1.6m) 10s |
| Best Surf | 9PM (Thu 3rd Sep) | 5ft (1.6m) 10s |
| Most Powerful | 12AM (Thu 3rd Sep) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, it's Rusty. I'm not gonna sugarcoat it—Aha Rivermouth is looking grim for a long stretch. We start off on Wednesday the 2nd and Thursday the 3rd with zero quality. The wind is all wrong, cross-onshore and lumpy, and the water's a warm 83°F, which is pretty average for this time of year.
The one and only bright spot is Friday the 4th of September in the morning. That’s your standout. We get a nice switch to offshore wind from the WSW at 9 mph, making things glassy. There’s a 3 ft swell rolling in from the north with a moderate combined energy of 222. It’s not huge, but the offshore flow is going to groom that jetty break into some clean, fun little waves.
But it’s a flash in the pan. By Friday afternoon, the swell shrinks to 3 ft with a weak 7-second period, and from Saturday the 5th all the way to Thursday the 17th, it’s a wasteland. You’ll see some bigger surf later on—like on the 16th and 17th with waves over 7 ft and strong energy readings in the thousands—but the wind is always onshore or cross-onshore, sometimes cranking up to 28 mph, making it lumpy as hell. That’s a mess best left for the kite surfers.
So, one morning to aim for: Friday the 4th. The rest of the 16 days? A long, dry, ugly run. Keep the faith, things can flip.
- Rusty
Short Range ForecastHeavy rain (total 44mm), heaviest during Wed night. Warm (max 28°C on Wed morning, min 26°C on Wed night). Winds decreasing (strong winds from the NE on Wed night, light winds from the WNW by Fri night). | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Sun morning. Warm (max 28°C on Sat morning, min 27°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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) | E 9 | E 9 | E 10 | E 10 | E 10 | E 10 | N 8 | NNW 7 | NNW 7 | N 9 | N 10 | N 9 | N 8 | N 9 | N 8 | N 8 | N 7 | N 9 | E 11 | E 10 | E 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 635 | 763 | 1792 | 1037 | 786 | 327 | 111 | 89 | 63 | 287 | 449 | 320 | 277 | 293 | 173 | 55 | 26 | 81 | 403 | 363 | 617 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | cross-off | off | off | off | cross-off | cross-on | cross-on | cross | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross |
High Tide | 9:45AM1.84m | 9:34PM1.95m | 10:38AM1.67m | 10:11PM1.87m | 11:54AM1.50m | 10:59PM1.76m | 2:11PM1.44m | 00:22AM1.66m | 4:12PM1.54m | 2:30AM1.65m | 5:03PM1.68m | 4:01AM1.76m | 5:38PM1.80m | ||||||||
Low Tide | 3:32PM0.79m | 4:15AM0.47m | 4:07PM0.97m | 5:15AM0.55m | 4:54PM1.15m | 6:40AM0.62m | 6:28PM1.30m | 8:28AM0.61m | 9:01PM1.29m | 9:55AM0.51m | 10:26PM1.13m | 10:54AM0.40m | 11:15PM0.94m | ||||||||
 |  |  |  | | | | | | | |  | | | | | | | | | | |
 | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — |
mm | — | — | 20 | 7 | 3 | 3 | 4 | 4 | 3 | — | — | — | 3 | 2 | 4 | — | — | 2 | 1 | — | — |
Temp °C | 28 | 27 | 27 | 27 | 28 | 27 | 28 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 28 |
Feels °C | 28 | 24 | 26 | 30 | 30 | 30 | 32 | 30 | 30 | 31 | 30 | 32 | 30 | 31 | 32 | 31 | 30 | 29 | 29 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | ENE 12 | SSW 10 | SW 10 | E 10 | E 10 | E 10 | N 8 | S 8 | S 9 | N 9 | N 10 | N 9 | N 8 | N 9 | N 8 | N 8 | N 7 | N 9 | E 11 | E 10 | E 11 |
| kJ | 50 | 64 | 47 | 1037 | 786 | 327 | 111 | 169 | 151 | 287 | 449 | 320 | 277 | 293 | 173 | 55 | 26 | 81 | 403 | 363 | 617 |
Swell 2 Height (m) Direction Period (s) | SW 10 | E 12 | SSW 9 | SSW 9 | N 6 | N 7 | SSW 9 | NNW 7 | NNW 7 | S 8 | S 8 | SSW 8 | SSW 8 | SSW 8 | S 8 | SSW 8 | NW 6 | NE 10 | WNW 6 | S 8 | SSW 8 |
| kJ | 36 | 73 | 26 | 58 | 37 | 33 | 121 | 89 | 63 | 140 | 88 | 62 | 92 | 46 | 29 | 39 | 19 | 33 | 15 | 19 | 11 |
Swell 3 Height (m) Direction Period (s) | S 8 | — | — | E 16 | SW 12 | N 9 | E 9 | E 8 | E 9 | E 10 | E 10 | S 8 | E 9 | S 8 | E 9 | NW 6 | E 8 | E 8 | S 8 | N 10 | S 8 |
| kJ | 12 | — | — | 5 | 87 | 14 | 111 | 49 | 58 | 46 | 47 | 34 | 27 | 31 | 39 | 18 | 23 | 20 | 21 | 16 | 10 |
Wind waves Height (m) Direction Period (s) | E 9 | E 9 | E 10 | N 6 | W 3 | SSW 11 | SSW 9 | — | — | — | NW 3 | — | — | NW 3 | — | — | — | NE 3 | N 8 | NNW 6 | N 7 |
| kJ | 635 | 763 | 1792 | 32 | 4 | 335 | 243 | — | — | — | 1 | — | — | 2 | — | — | — | 1 | 57 | 68 | 171 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 70 | 66 | 595 | 30 | 30 | 0 | 0 | 0 | 0 | 31 | 90 | 12 | 40 | 60 | 12 | 90 | 90 | 90 | 710 | 75 | 75 |
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