
Surf Forecasts:
Aha Rivermouth surf forecast from 7 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 12AM (local time) - 3ft (0.9m), 11s period, ENE swell with offshore winds.
- Most powerful swell: Friday 7 Aug, 12PM (local time) - 10ft (3.0m), 13s period, ENE swell with 3,118 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 12AM (local time) - 3ft (0.9m), 11s 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 Wednesday (Aug 12) at 12AM. The primary swell is predicted to be 0.9m and 11s period with a secondary swell of 0.9m and 4s. 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 13s and forecast to arrive on Friday (Aug 07) at 12PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 6.5m 11s period and expected on Saturday (Aug 08) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 12th Aug) | 3ft (0.9m) 11s |
| Best Surf | 12AM (Wed 12th Aug) | 3ft (0.9m) 11s |
| Most Powerful | 12PM (Fri 7th Aug) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming down the pipe for the next couple of weeks.
First up, we’ve got Aha Rivermouth on the table. The water’s sitting at a warm 86.2°, which is a touch warmer than normal for this time of year – nice for a long session without a winter suit. Now, the bad news is that for the next week or so, the surf just isn’t going to be worth paddling out for. The conditions are poor, or the swell is ill-timed with the wind. You’ve got a few days with some clean faces, but the wave energy is low, and the swell direction isn’t locking in with the break’s optimum from the northeast.
The whole stretch from Friday the 7th right through to Thursday the 14th is pretty much a write-off. There’s a monster swell on the Friday morning with a massive 14.8ft from the ENE and a staggering energy reading (15427) – but the problem is, it’s a severe gale cross-shore, and the report explicitly says it’s too big for this break. That’s a kite surfer’s dream, not a paddle surfer’s. After that, the wind drops but the swell drops off a cliff, and you’re left with messy onshore or cross-shore breezes and weak, short-period swell. You’ll see a lot of zeros on the scorecard.
The real window of interest, and it’s a long shot, comes on the morning of Saturday the 15th of August. We’ve got a clean-looking 2.9ft swell from the ENE with a period bumping up to 11 seconds, and a gentle cross-shore breeze. The energy is moderate (272). It’s not going to blow your mind, but after so many flat, windy days, a clean little ankle-to-waist high runner on a rivermouth is something to get excited about. The crowds are listed as "sometimes" there, so you might have a few pals out.
After that, the window closes again. The week of the 16th sees another disappointing run of onshore winds and short-period slop, with a few pulses of bigger, messy 5.6ft – 6.9ft closeouts. There’s a glimmer on the morning of Friday the 21st with a cleaner 3.9ft swell and a light offshore cross, but it's a marginal call. Honestly, for the next two weeks, the 15th looks like the only morning worth the walk.
Short Range ForecastHeavy rain (total 143mm), heaviest during Fri night. Warm (max 29°C on Fri afternoon, min 28°C on Fri morning). Winds decreasing (stormy winds from the SSE on Fri night, strong winds from the SSE by Sun night). | Days 4-6 Weather SummaryHeavy rain (total 50mm), heaviest during Tue afternoon. Warm (max 29°C on Mon morning, min 28°C on Tue night). Winds decreasing (fresh winds from the SSE on Mon morning, light winds from the W by Wed morning). | ||||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | |||||||||||||||
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 14 | N 10 | ENE 11 | ENE 11 | E 10 | E 10 | ENE 10 | E 9 | E 14 | E 7 | E 13 | E 12 | ENE 12 | ENE 12 | ENE 11 | ENE 11 | ENE 11 | ESE 6 | ENE 10 | ESE 6 | ESE 6 |
Wave Graph | |||||||||||||||||||||
7551 | 1225 | 278 | 297 | 240 | 226 | 154 | 139 | 306 | 126 | 427 | 314 | 240 | 183 | 186 | 138 | 130 | 56 | 88 | 60 | 58 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | on | on | on | on | cross |
High Tide | 2:06PM1.45m | 00:58AM1.73m | 4:10PM1.52m | 2:34AM1.74m | 5:16PM1.66m | 3:57AM1.83m | 6:00PM1.79m | 5:01AM1.95m | 6:35PM1.89m | 5:53AM2.06m | 7:07PM1.97m | 6:38AM2.14m | 7:37PM2.02m | ||||||||
Low Tide | 6:49PM1.21m | 8:43AM0.59m | 8:47PM1.28m | 10:05AM0.46m | 10:21PM1.21m | 11:06AM0.32m | 11:21PM1.08m | 11:55AM0.21m | 00:07AM0.93m | 12:36PM0.15m | 00:47AM0.79m | 1:14PM0.15m | 1:25AM0.67m | ||||||||
5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | |
— | 7:09 | — | — | 7:09 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:06 | — | |
mm | 12 | 24 | 70 | 8 | 7 | 9 | 4 | 3 | 6 | 2 | 8 | 10 | 5 | 11 | 13 | 1 | — | — | — | 4 | 14 |
Temp °C | 28 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 20 | 25 | 20 | 21 | 24 | 25 | 26 | 26 | 27 | 29 | 30 | 30 | 31 | 32 | 32 | 33 | 32 | 32 | 32 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | ENE 14 | N 10 | ENE 11 | ENE 11 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | SW 12 | S 11 | S 11 | S 11 | S 10 | S 10 | S 10 | SSW 10 | S 9 | SSW 10 | S 9 | SW 9 | SSW 10 |
7551 | 1225 | 278 | 297 | 3065 | 2323 | 1356 | 975 | 836 | 826 | 1056 | 743 | 367 | 296 | 225 | 115 | 126 | 157 | 97 | 83 | 117 | |
Swell 2 Height (m) Direction Period (s) | NNE 11 | ENE 12 | ENE 16 | — | E 10 | E 10 | ENE 10 | E 9 | W 12 | SW 12 | E 13 | SW 12 | SSW 10 | SSW 10 | SSW 10 | ENE 11 | ENE 11 | S 9 | SW 10 | S 8 | S 9 |
1483 | 901 | 25 | — | 240 | 226 | 154 | 139 | 319 | 511 | 427 | 324 | 184 | 255 | 175 | 138 | 130 | 97 | 92 | 68 | 57 | |
Swell 3 Height (m) Direction Period (s) | — | ENE 16 | ENE 16 | — | ENE 15 | ENE 15 | ENE 15 | ENE 14 | E 14 | E 7 | SW 12 | E 12 | ENE 12 | ENE 12 | ENE 11 | W 7 | SW 9 | ENE 10 | ENE 10 | ENE 10 | ENE 10 |
— | 173 | 25 | — | 21 | 21 | 42 | 70 | 306 | 126 | 324 | 314 | 240 | 183 | 186 | 24 | 88 | 56 | 88 | 57 | 39 | |
Wind waves Height (m) Direction Period (s) | NNW 11 | W 8 | S 10 | S 11 | S 10 | S 10 | S 11 | S 10 | SE 8 | S 11 | E 7 | — | — | SSE 10 | ESE 4 | SSE 9 | ESE 5 | ESE 6 | ESE 6 | ESE 6 | ESE 6 |
6393 | 1122 | 6522 | 8939 | 5015 | 3233 | 2909 | 1891 | 600 | 1278 | 81 | — | — | 386 | 24 | 222 | 41 | 47 | 50 | 60 | 58 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1382 | 815 | 687 | 926 | 801 | 693 | 693 | 687 | 664 | 673 | 664 | 12 | 595 | 595 | 0 | 3 | 75 | 90 | 68 | 664 | 68 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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.











