Surf Forecasts:
Aha Rivermouth surf forecast from 23 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 3PM (local time) - 18ft (5.5m), 16s period, E swell with cross-onshore winds.
- Most powerful swell: Tuesday 25 Aug, 3PM (local time) - 18ft (5.5m), 16s period, E swell with 15,640 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 3PM (local time) - 18ft (5.5m), 16s 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 Tuesday (Aug 25) at 3PM. The primary swell is predicted to be 5.5m and 16s period. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 5.5m 16s and forecast to arrive on Tuesday (Aug 25) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.5m 9s period and expected on Wednesday (Aug 26) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 25th Aug) | 18ft (5.5m) 16s |
| Best Surf | 3PM (Tue 25th Aug) | 18ft (5.5m) 16s |
| Most Powerful | 3PM (Tue 25th Aug) | 18ft (5.5m) 16s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, grab your board, I'm Rusty. Let's break down what's on the menu for the coming days.
Right off the bat, it's a pretty grim stretch. We've got a solid 12-day gap of nothing worth paddling out for at Aha Rivermouth. The wind is just relentless, mostly howling onshore or cross-shore, and the swell is either tiny, blown out, or way too big and messy. From Monday the 24th right through to Friday the 4th of September, it's a write-off. The combined wave energy gets ridiculously high, like 15,640 (moderate to very strong), but it's all wind-slapped and unrideable. There's even a gale forecast for the 26th – you'd be mad to get out there.
We finally get a glimmer of hope on the 5th of September. That Saturday morning starts showing some promise. The wind swings light offshore from the west at just 3 mph, making things clean. The swell picks up to 4 ft from the ESE with a very long 15-second period. The combined energy is a solid 700 (moderate), so there's some proper push behind it. It's looking good for a paddle.
But the real standout, the one to circle on your calendar, is Saturday afternoon on the 5th of September. It gets glassy, with no wind at all. The swell bumps up to a clean 5 ft from the SE, riding on a 14-second period. The combined energy is a strong 1,112 (moderate to strong). This is the best on offer. It's excellent for experienced surfers – that long period groundswell will wrap in nicely at a rivermouth setup. Just be aware, with that quality and clean conditions, you won't be the only one thinking it. Crowds are sometimes an issue here, so get your timing right.
Now, a heads up for Sunday the 6th of September. It stays glassy in the morning, but the swell pumps up to 10 ft from the ESE. That's expert territory and likely too big and powerful for the break, so probably best to give it a miss unless you're properly charging.
The following week drops off again into tiny, weak surf with poor winds. So, your window is that Saturday afternoon.
Rusty
Short Range ForecastHeavy rain (total 105mm), heaviest during Tue night. Warm (max 29°C on Tue morning, min 27°C on Sun night). Winds increasing (light winds from the ESE on Sun night, extremely windy from the W by Tue night). | Days 5-7 Weather SummaryHeavy rain (total 28mm), heaviest during Sat morning. Warm (max 28°C on Wed night, min 28°C on Wed night). Winds decreasing (strong winds from the SSE on Wed night, moderate winds from the SSE by Fri afternoon). | ||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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) | ESE 12 | ESE 16 | ESE 16 | E 16 | E 17 | E 16 | ENE 13 | N 9 | E 10 | E 8 | E 8 | ENE 12 | ENE 12 | SE 7 | SE 7 | SE 9 | ESE 8 | ESE 7 | ESE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 60 | 196 | 1256 | 3470 | 13371 | 15640 | 8244 | 339 | 94 | 68 | 60 | 51 | 48 | 423 | 254 | 560 | 339 | 205 | 198 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross | cross | cross | cross |
High Tide | 3:31AM1.54m | 6:01PM1.65m | 4:36AM1.64m | 6:20PM1.74m | 5:20AM1.76m | 6:39PM1.83m | 5:58AM1.87m | 6:59PM1.90m | 6:33AM1.97m | 7:20PM1.96m | 7:07AM2.05m | 7:43PM2.00m | |||||||
Low Tide | 10:37PM1.33m | 10:52AM0.63m | 11:23PM1.21m | 11:30AM0.52m | 11:53PM1.09m | 12:02PM0.43m | 00:18AM0.96m | 12:31PM0.36m | 00:44AM0.82m | 1:00PM0.33m | 1:11AM0.69m | 1:29PM0.34m | 1:40AM0.57m | ||||||
 |  |  |  |  | | | | | | | | | | | | | | | |
 | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | 6:57 | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — |
mm | 2 | — | — | — | 1 | 5 | 65 | 27 | 5 | 6 | 2 | 3 | 1 | 2 | 3 | 5 | 4 | 2 | — |
Temp °C | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 30 | 29 | 29 | 30 | 27 | 24 | 21 | 22 | 25 | 26 | 27 | 27 | 29 | 29 | 30 | 29 | 28 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 9 | ESE 16 | ESE 16 | E 16 | E 17 | E 16 | ENE 13 | N 9 | WNW 9 | W 9 | W 10 | WSW 11 | WSW 12 | SW 11 | WSW 12 | SSW 10 | S 8 | SW 10 | SW 10 |
| kJ | 71 | 196 | 1256 | 3470 | 13371 | 15640 | 8244 | 339 | 1097 | 497 | 620 | 1124 | 964 | 455 | 280 | 212 | 93 | 124 | 61 |
Swell 2 Height (m) Direction Period (s) | ESE 12 | SW 8 | SW 9 | SW 9 | — | — | — | E 11 | E 10 | E 8 | E 8 | ENE 12 | ENE 12 | ENE 12 | SSW 10 | WSW 10 | SW 10 | S 8 | S 8 |
| kJ | 60 | 45 | 41 | 28 | — | — | — | 250 | 94 | 68 | 60 | 51 | 48 | 28 | 117 | 59 | 177 | 60 | 29 |
Swell 3 Height (m) Direction Period (s) | ENE 10 | ESE 12 | ENE 10 | — | — | — | — | E 15 | ENE 14 | ENE 13 | ENE 13 | E 18 | ENE 16 | ENE 15 | ENE 15 | ENE 13 | ENE 13 | E 13 | ENE 12 |
| kJ | 31 | 81 | 42 | — | — | — | — | 17 | 38 | 58 | 56 | 6 | 25 | 21 | 42 | 35 | 59 | 85 | 50 |
Wind waves Height (m) Direction Period (s) | E 4 | E 6 | E 6 | ENE 7 | — | — | NNW 9 | WSW 9 | SSW 8 | S 7 | S 8 | SSE 8 | SSE 6 | SE 7 | SE 7 | SE 9 | ESE 8 | ESE 7 | ESE 7 |
| kJ | 19 | 41 | 86 | 105 | — | — | 5310 | 4868 | 1783 | 783 | 786 | 614 | 307 | 423 | 254 | 560 | 339 | 205 | 198 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 68 | 70 | 70 | 40 | 595 | 801 | 664 | 673 | 673 | 685 | 687 | 717 | 681 | 690 | 935 | 640 | 70 | 935 | 70 |
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.
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