Surf Forecasts:
Aha Rivermouth surf forecast from 28 Jul 2026:
- Most powerful swell: Wednesday 5 Aug, 9AM (local time) - 10ft (3.0m), 18s period, ENE swell with 6,369 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 3.0m 18s and forecast to arrive on Wednesday (Aug 05) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 7s period and expected on Thursday (Jul 30) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Wed 5th Aug) | 10ft (3.0m) 18s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, this is Rusty here, and I’ve gotta be straight with you – we’re looking at a pretty grim stretch for Aha Rivermouth.
The whole 16-day window is basically a write-off for decent waves. There’s a tiny bit of knee-high, weak swell from the southeast on Wednesday morning, July 29th, with glassy conditions, but it’s just too small and weak to bother with. That’s about as good as it gets for the first week, to be honest. We’ve got a long gap of nothing but tiny, poor surf right through until the start of August.
The water temp is sitting at a warm 85°, which is about average for this time of year.
Now, the second week gets a whole lot bigger, but it’s all wrong. By Monday, August 3rd, we start seeing a long-period groundswell from the east pushing in, with combined energy climbing into the hundreds (737) and then into the thousands (1252). The problem is the wind. It's a moderate to fresh cross-onshore, making a mess of things. The swell keeps building through the week, hitting 15 ft on Thursday, August 6th, with a massive combined energy (12636). That’s huge, but the wind is a fresh cross-shore, and for a beach/jetty setup, that’s just a washing machine. It’s only for experts, and even then, it’s going to be a battle.
Then on Friday, August 7th, we get storm-force winds from the west-southwest at 56 mph, blowing straight offshore, which would make it clean, but the wind is so strong you won’t be able to paddle into a thing. The third week looks similar – big, unruly swell with poor wind and a risk of thunderstorms. The setup here looks far more interesting for kite surfing than paddle surfing.
The only flicker of hope comes on the final day of the forecast, Thursday, August 13th. The afternoon has a 7 ft swell from the east-northeast (12 seconds) with a moderate cross-shore wind, and it gets a marginal score. It’s still not great, but it’s the only thing that’s not a total zero. For a break that’s fairly consistent, this is a rare, blank run.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Wed afternoon, min 28°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Mon night. Warm (max 30°C on Mon morning, min 28°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | |||||||||||||||
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 10 | SE 10 | ESE 9 | ESE 9 | ESE 9 | ENE 13 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 15 | E 16 | E 15 | E 16 | E 17 | E 18 | E 18 | E 18 | E 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 24 | 25 | 28 | 29 | 17 | 17 | 14 | 15 | 9 | 15 | 6 | 8 | 39 | 118 | 286 | 719 | 1236 | 1735 | 2454 | 2998 | 3807 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross-off | cross-on | on | glassy | glassy | cross-on | cross-off | cross | cross-on | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | on | on |
High Tide | 7:33PM1.84m | 6:40AM1.92m | 7:56PM1.89m | 7:16AM1.97m | 8:20PM1.92m | 7:52AM1.99m | 8:46PM1.94m | 8:30AM1.98m | 9:13PM1.94m | 9:12AM1.92m | 9:43PM1.92m | 9:57AM1.81m | 10:16PM1.89m | ||||||||
Low Tide | 12:53PM0.31m | 1:04AM1.00m | 1:22PM0.27m | 1:33AM0.91m | 1:52PM0.27m | 2:03AM0.82m | 2:22PM0.31m | 2:36AM0.74m | 2:54PM0.40m | 3:13AM0.68m | 3:27PM0.52m | 3:54AM0.64m | 4:02PM0.68m | ||||||||
 | |  | | | |  | | | | | | | |  | | |  |  | | | |
 | 5:48 | — | — | 5:50 | — | — | 5:50 | — | — | 5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — |
 | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 3 | 6 |
Temp °C | 29 | 30 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 29 | 29 | 29 | 29 |
Feels °C | 34 | 34 | 33 | 34 | 33 | 34 | 33 | 33 | 34 | 31 | 32 | 33 | 32 | 31 | 31 | 32 | 31 | 31 | 30 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | E 9 | E 9 | E 9 | E 9 | N 5 | E 9 | E 16 | E 15 | E 16 | E 17 | E 18 | E 18 | E 18 | E 18 |
| kJ | 24 | 25 | 28 | 29 | 17 | 9 | 14 | 15 | 6 | 15 | 6 | 5 | 13 | 118 | 286 | 719 | 1236 | 1735 | 2454 | 2998 | 3807 |
Swell 2 Height (m) Direction Period (s) | SE 5 | SE 5 | ESE 5 | S 7 | E 8 | E 10 | ESE 10 | ESE 9 | N 5 | N 5 | S 8 | E 9 | E 15 | E 9 | ESE 8 | SE 9 | S 7 | S 7 | — | — | — |
| kJ | 4 | 4 | 2 | 4 | 5 | 8 | 9 | 8 | 2 | 2 | 5 | 6 | 39 | 6 | 13 | 3 | 4 | 4 | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 7 | E 9 | S 7 | SE 5 | E 10 | ENE 13 | E 13 | SE 6 | ESE 9 | S 8 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | S 7 | E 15 | SE 8 | — | — | — |
| kJ | 9 | 6 | 4 | 1 | 8 | 17 | 3 | 1 | 9 | 5 | 3 | 8 | 8 | 8 | 8 | 4 | 4 | 3 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | N 5 | — | N 5 | N 4 | N 4 | N 5 | N 4 | N 4 | — | — | NE 5 |
| kJ | — | — | — | — | — | — | — | — | — | — | 5 | — | 8 | 7 | 18 | 15 | 12 | 16 | — | — | 45 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 75 | 605 | 644 | 935 | 17 | 706 | 1382 | 926 | 1270 | 1270 | 596 | 75 | 75 | 30 | 75 | 75 | 31 | 595 | 40 | 40 |
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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