Surf Forecasts:
Aha Rivermouth surf forecast from 11 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 12AM (local time) - 3ft (0.9m), 12s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 11 Aug, 3PM (local time) - 3ft (0.9m), 12s period, ENE swell with 254 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 12AM (local time) - 3ft (0.9m), 12s 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 12s period. 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 0.9m 12s and forecast to arrive on Tuesday (Aug 11) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 7s period and expected on Friday (Aug 14) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 12th Aug) | 3ft (0.9m) 12s |
| Best Surf | 12AM (Wed 12th Aug) | 3ft (0.9m) 12s |
| Most Powerful | 3PM (Tue 11th Aug) | 3ft (0.9m) 12s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright gang, Rusty here, breaking down the next couple of weeks for ya.
I’m not gonna sugarcoat it – the early part of this forecast is a stinker. We’ve got a big gap with absolutely nothing worthwhile, starting now and stretching all the way through to around August 24th. It’s a long stretch of messy wind, tiny swell, and poor conditions. Not much to get excited about.
The only bright spot, and it’s a long way off, is on Tuesday, August 25th. That’s more than a week out, so it’s a little shaky, but it’s the only standout. A solid groundswell from the SE at about 8 feet. It’s got a long period of 14 seconds, packing a ton of energy (2256). The wind is forecast to be a light offshore (SSW), which means glassy, clean conditions. That’s a *proper* day for the rivermouth. But with 8-foot waves, that’s big, powerful stuff. This one is for experienced surfers only.
There’s one tiny, barely-there window before that, on Wednesday, August 12th. The morning has a clean offshore breeze on a tiny waist-high 3ft ENE swell, and it goes glassy in the afternoon. The energy is weak (130-153). It’s a chance to get wet, but the waves will be small and average.
So, the takeaway: a long, boring stretch, then one promising but distant day for the crew who know what they’re doing. Keep an eye on it.
Rusty.
Short Range ForecastHeavy rain (total 39mm), heaviest during Tue morning. Warm (max 28°C on Tue morning, min 26°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Fri night. Warm (max 29°C on Sat afternoon, min 27°C on Fri afternoon). Wind will be generally light. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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 12 | ENE 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | E 6 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 240 | 254 | 193 | 135 | 130 | 102 | 114 | 92 | 57 | 38 | 36 | 10 | 93 | 101 | 116 | 104 | 102 | 102 | 86 | 92 | 146 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | off | glassy | cross-off | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross | cross-off | cross | cross | cross-on | cross-on | cross-on |
High Tide | 6:35PM1.89m | 5:53AM2.06m | 7:07PM1.97m | 6:38AM2.14m | 7:37PM2.02m | 7:20AM2.16m | 8:06PM2.05m | 8:00AM2.13m | 8:34PM2.06m | 8:38AM2.05m | 9:03PM2.03m | 9:16AM1.92m | 9:31PM1.98m | ||||||||
Low Tide | 11:55AM0.21m | 00:07AM0.93m | 12:36PM0.15m | 00:47AM0.79m | 1:14PM0.15m | 1:25AM0.67m | 1:49PM0.20m | 2:01AM0.58m | 2:21PM0.30m | 2:37AM0.53m | 2:51PM0.43m | 3:14AM0.53m | 3:20PM0.59m | ||||||||
 |  |  | |  |  |  | | | | | |  | |  | |  | | | | | |
 | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — |
 | — | 7:07 | — | — | 7:06 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — |
mm | 8 | 3 | 7 | 7 | 4 | 6 | — | 2 | 2 | — | — | 1 | — | — | — | — | 1 | 2 | 3 | 3 | — |
Temp °C | 28 | 28 | 28 | 27 | 26 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 27 |
Feels °C | 31 | 32 | 31 | 30 | 31 | 31 | 30 | 30 | 31 | 33 | 32 | 32 | 33 | 33 | 32 | 32 | 32 | 31 | 30 | 29 | 26 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 9 | S 9 | S 9 | S 9 | S 9 | SSW 8 | S 8 | S 8 | SSW 8 | S 8 | S 8 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | S 8 | ENE 10 | ENE 11 |
| kJ | 200 | 211 | 211 | 164 | 123 | 119 | 120 | 66 | 68 | 94 | 51 | 50 | 93 | 101 | 116 | 104 | 102 | 102 | 57 | 92 | 146 |
Swell 2 Height (m) Direction Period (s) | ENE 12 | E 6 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | SW 8 | SW 9 | S 8 | S 8 | S 9 | S 8 | S 8 | SSW 9 | ENE 10 | S 8 | SW 9 |
| kJ | 240 | 59 | 193 | 135 | 130 | 102 | 114 | 92 | 57 | 38 | 34 | 38 | 50 | 47 | 52 | 46 | 63 | 52 | 86 | 28 | 36 |
Swell 3 Height (m) Direction Period (s) | SSW 10 | ENE 12 | E 6 | E 6 | SW 9 | ENE 12 | N 8 | SW 8 | SW 9 | N 7 | ENE 10 | E 6 | SSW 8 | SW 8 | SSW 8 | SW 9 | SW 9 | ESE 11 | SW 8 | SW 9 | S 8 |
| kJ | 157 | 254 | 35 | 18 | 27 | 56 | 28 | 35 | 36 | 8 | 36 | 10 | 47 | 34 | 47 | 39 | 39 | 12 | 35 | 36 | 18 |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | — | — | — | — | — | W 5 | W 7 | W 6 | W 5 | WNW 4 | — | — | — | — | — | SSE 8 | ESE 5 | ESE 5 | SE 5 |
| kJ | 61 | 88 | — | — | — | — | — | 1 | 124 | 71 | 33 | 15 | — | — | — | — | — | 65 | 18 | 24 | 33 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 12 | 0 | 0 | 0 | 0 | 75 | 94 | 40 | 12 | 90 | 68 | 12 | 12 | 12 | 0 | 12 | 12 | 70 | 70 | 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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