Surf Forecasts:
Aha Rivermouth surf forecast from 9 Jul 2026:
- Best quality surf: Thursday 9 Jul, 6PM (local time) - 16ft (5.0m), 17s period, SE swell with cross-onshore winds.
- Most powerful swell: Friday 10 Jul, 9PM (local time) - 28ft (8.5m), 18s period, SE swell with 45,869 kJ wave energy.
- Next surfable swell (1★+): Thursday 9 Jul, 6PM (local time) - 16ft (5.0m), 17s period with SE 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 (Jul 09) at 6PM. The primary swell is predicted to be 5.0m and 17s 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 8.5m 18s and forecast to arrive on Friday (Jul 10) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 9.5m 18s period and expected on Friday (Jul 10) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Thu 9th Jul) | 16ft (5.0m) 17s |
| Best Surf | 6PM (Thu 9th Jul) | 16ft (5.0m) 17s |
| Most Powerful | 9PM (Fri 10th Jul) | 28ft (8.5m) 18s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Alright, Rusty here, breaking down the next stretch at Aha Rivermouth. Let’s be real: it’s a slow start.
We’re starting today, Thursday, July 9th, and the first real surfable moment is a long way off. The first week is a total write-off. From the 9th to the 11th, we’re looking at a massive, dangerous swell pushing 13ft to 24ft out of the SE, with screaming easterly winds. The wave energy is extreme (over 33000), but it’s all blown out, messy, and way too big for anyone. Then it goes flat on the 11th and 12th, with zero energy. From the 13th to the 17th, it’s tiny – knee-high at best, with energy readings in the teens. It’s clean, but there’s nothing to ride.
The first real sign of life shows up on Monday, July 20th. The afternoon brings a 8ft swell from the ENE with a 9-second period and a clean cross-offshore breeze. The energy hits 1170, making it worth a look. It’s still a bit of a toss-up with the tide, but it’s the first real window.
The big one, the one you want to plan for, is the morning of Tuesday, July 21st. We’ve got a 10ft NE swell with a 10-second period. The wind is a light cross-shore, and the energy is pumping at 1503. That’s a heavy swell – over 8ft – so this is for experienced surfers only. The water temp is about 83°F, which is normal for the season. The NE direction is a solid match for the break. It’s going to be powerful and demanding.
After that, it fades out. The 22nd and 23rd offer some marginal 5ft to 5ft NNW swell, but the quality is average. The 24th has a tiny 3ft N swell with glassy conditions in the morning, but it’s not much.
So, the call is this: a long, dry spell for the first week, then a solid, expert-only day on the 21st. The rest is a waiting game. Forecasts change, but for now, that’s the picture.
Rusty.
Short Range ForecastHeavy rain (total 31mm), heaviest during Fri afternoon. Warm (max 29°C on Thu morning, min 27°C on Fri morning). Winds increasing (fresh winds from the E on Thu morning, severe gales from the ESE by Fri night). | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sun morning. Warm (max 30°C on Mon afternoon, min 28°C on Mon night). Winds decreasing (strong winds from the SSE on Sun morning, calm by Tue night). | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
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) | SE 16 | SE 16 | SE 17 | SE 18 | SE 18 | SSE 18 | SSE 17 | SSE 15 | S 13 | SSE 12 | SE 14 | E 9 | SSE 9 | E 9 | ESE 5 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | E 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7760 | 11344 | 17657 | 28182 | 35911 | 0 | 0 | 0 | 0 | 0 | 8 | 16 | 0 | 15 | 34 | 16 | 28 | 26 | 28 | 27 | 44 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | glassy | on | glassy |
High Tide | 2:24PM1.47m | 1:52AM1.75m | 4:01PM1.54m | 3:01AM1.80m | 5:12PM1.66m | 4:05AM1.88m | 6:04PM1.77m | 5:02AM1.97m | 6:48PM1.86m | 5:53AM2.06m | 7:27PM1.93m | 6:40AM2.11m | 8:03PM1.97m | ||||||||
Low Tide | 7:40PM1.05m | 9:07AM0.54m | 9:04PM1.12m | 10:14AM0.38m | 10:19PM1.12m | 11:11AM0.23m | 11:20PM1.07m | 12:01PM0.11m | 00:10AM1.00m | 12:46PM0.04m | 00:56AM0.91m | 1:29PM0.03m | 1:38AM0.83m | ||||||||
 | |  |  | | | | | | | | | | |  |  | | | | |  | |
 | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — |
 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — |
mm | — | — | 1 | 5 | 9 | 8 | 3 | 3 | 2 | 3 | 1 | 2 | 1 | — | — | — | — | 2 | — | 2 | — |
Temp °C | 29 | 29 | 29 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 30 | 29 | 28 | 29 | 28 |
Feels °C | 29 | 28 | 28 | 23 | 21 | 20 | 22 | 26 | 26 | 28 | 29 | 31 | 31 | 33 | 32 | 33 | 34 | 34 | 34 | 34 | 33 |
Swell 1 Height (m) Direction Period (s) | SE 16 | SE 16 | SE 17 | SSE 18 | SSE 18 | — | — | SSW 16 | SSW 14 | SW 14 | SSE 11 | W 11 | SSE 10 | S 9 | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | E 10 |
| kJ | 7760 | 11344 | 17657 | 43572 | 53757 | — | — | 16936 | 3167 | 990 | 1945 | 112 | 574 | 397 | 189 | 169 | 132 | 82 | 42 | 41 | 44 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | WSW 12 | SW 11 | W 10 | WSW 8 | E 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | S 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | 304 | 59 | 54 | 24 | 15 | 16 | 28 | 26 | 28 | 27 | 29 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | SE 14 | E 9 | SW 10 | E 9 | W 8 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 |
| kJ | — | — | — | — | — | — | — | — | — | — | 8 | 16 | 26 | 15 | 12 | 14 | 15 | 16 | 16 | 16 | 17 |
Wind waves Height (m) Direction Period (s) | — | — | — | SE 18 | SE 18 | SSE 18 | SSE 17 | SSE 15 | S 13 | SSE 12 | — | SSE 10 | SSE 9 | — | ESE 5 | — | — | — | — | — | — |
| kJ | — | — | — | 28182 | 35911 | 48158 | 38627 | 21333 | 8025 | 2845 | — | 951 | 641 | — | 34 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 595 | 931 | 595 | 693 | 693 | 693 | 693 | 935 | 595 | 595 | 640 | 595 | 627 | 919 | 605 | 605 | 17 | 17 | 17 | 17 | 17 |
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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