Surf Forecasts:
Aha Rivermouth surf forecast from 12 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 3PM (local time) - 3.5ft (1.0m), 12s period, E swell with 294 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 1.0m 12s and forecast to arrive on Sunday (Jul 19) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 11s period and expected on Sunday (Jul 12) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Sun 19th Jul) | 3.5ft (1.0m) 12s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Alright folks, Rusty here. Gotta be straight with you – the outlook for our local stretch is a bit of a waiting game. We're looking at a long, flat spell before anything even remotely surfable shows up. The first wave of note won't be until Saturday the 19th, and even then, it's a tough sell.
The first real chance to get wet is around Sunday the 19th of July. We've got a small increase in energy, with a 3ft swell from the east pushing through with a period of 12 seconds. The combined energy is moderate (294). The wind is a cross-off from the SSE, which is a decent start. But it's only a marginal call, with conditions described as "marginal surf forecast or questionable tide conditions." It's not great, but it's the first thing we've had.
The following week doesn't offer much relief. The swell tries to pick up a little Monday the 20th, with a 4ft swell from the ENE, but the period drops to 9 seconds, and we get a cross-shore ESE wind that'll chop things up. The energy is still moderate (188). It's a poor surf day.
Thursday the 23rd sees the swell energy climb to 240, with a 4ft east swell at 10 seconds, but the wind switches onshore from the NNE. That's a no-go for clean waves.
The best of a bad bunch looks to be Saturday the 25th of July. The swell drops back to 2ft from the ENE with a 10-second period, and the energy is weak (77). The wind goes light offshore from the NW in the morning. This is the only period where the wind is actually offshore, making for clean conditions. It's small, it's inconsistent, but it's the only window where the conditions might line up for a grovel session. The crowds at Aha Rivermouth can be "sometimes" busy, so on a rare clean day, you might have some company.
For the rest of the 16-day window, it's a flat, poor run. The water temp is sitting at 84°, which is about average for this time of year.
Overall, it's a tough forecast. If you're desperate, keep an eye on that Saturday the 25th for a small, clean morning session. Otherwise, the kites might be the only ones having fun when the wind pipes up later in the week.
Rusty out.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun morning. Warm (max 29°C on Sun morning, min 27°C on Tue night). Winds decreasing (strong winds from the SSE on Sun morning, light winds from the SSW by Tue night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Warm (max 29°C on Wed morning, min 27°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
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) | S 12 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 10 | E 9 | E 9 | E 10 | E 10 | E 10 | E 10 | ENE 10 | E 15 | E 13 | E 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 8 | 17 | 15 | 15 | 16 | 15 | 15 | 26 | 15 | 17 | 14 | 27 | 29 | 30 | 29 | 29 | 31 | 72 | 54 | 121 |
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 | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | on | cross-on |
High Tide | 6:04PM1.77m | 5:02AM1.97m | 6:48PM1.86m | 5:53AM2.06m | 7:27PM1.93m | 6:40AM2.11m | 8:03PM1.97m | 7:26AM2.13m | 8:38PM1.98m | 8:10AM2.09m | 9:13PM1.97m | 8:54AM2.00m | 9:47PM1.94m | ||||||||
Low Tide | 11:11AM0.23m | 11:20PM1.07m | 12:01PM0.11m | 00:10AM1.00m | 12:46PM0.04m | 00:56AM0.91m | 1:29PM0.03m | 1:38AM0.83m | 2:09PM0.07m | 2:20AM0.77m | 2:47PM0.17m | 3:02AM0.72m | 3:24PM0.31m | ||||||||
 |  |  |  | |  | | |  | | | | | | | | |  | | | | |
 | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — |
 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — |
mm | 1 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 1 | 4 |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 |
Feels °C | 29 | 31 | 29 | 31 | 31 | 31 | 32 | 32 | 32 | 33 | 32 | 33 | 34 | 34 | 33 | 34 | 32 | 33 | 32 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 13 | S 11 | W 10 | W 9 | S 9 | E 9 | S 8 | S 8 | S 8 | SW 10 | S 8 | SW 10 | SW 10 | SW 10 | SW 10 | WSW 9 | E 10 | SW 9 | E 10 | E 9 | E 11 |
| kJ | 572 | 2017 | 87 | 40 | 367 | 16 | 165 | 108 | 55 | 34 | 40 | 50 | 35 | 35 | 33 | 32 | 29 | 28 | 45 | 41 | 121 |
Swell 2 Height (m) Direction Period (s) | W 13 | W 11 | E 10 | E 9 | WSW 8 | W 8 | E 9 | E 9 | E 9 | E 9 | SW 9 | S 7 | S 7 | E 10 | E 10 | E 10 | SW 9 | ENE 10 | SW 9 | WSW 8 | SW 8 |
| kJ | 3 | 231 | 17 | 15 | 23 | 11 | 15 | 15 | 26 | 15 | 41 | 17 | 17 | 29 | 30 | 29 | 28 | 31 | 38 | 28 | 17 |
Swell 3 Height (m) Direction Period (s) | — | E 10 | SE 13 | W 11 | E 9 | SE 12 | W 7 | SW 10 | SW 8 | ESE 11 | E 10 | E 9 | E 9 | S 7 | S 7 | S 7 | W 4 | W 6 | E 15 | E 13 | ENE 15 |
| kJ | — | 8 | 7 | 10 | 15 | 6 | 4 | 15 | 18 | 12 | 17 | 14 | 27 | 16 | 9 | 8 | 4 | 6 | 72 | 54 | 74 |
Wind waves Height (m) Direction Period (s) | S 12 | S 11 | S 10 | S 10 | — | S 9 | — | — | — | S 8 | WSW 5 | — | WSW 4 | W 5 | — | — | — | — | — | ENE 6 | ENE 3 |
| kJ | 3637 | 2238 | 967 | 593 | — | 264 | — | — | — | 57 | 4 | — | 7 | 2 | — | — | — | — | — | 4 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 627 | 683 | 605 | 605 | 627 | 70 | 70 | 70 | 17 | 17 | 627 | 17 | 605 | 673 | 17 | 17 | 746 | 68 | 68 | 68 | 60 |
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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