Surf Forecasts:
Aha Rivermouth surf forecast from 2 Aug 2026:
- Best quality surf: Thursday 6 Aug, 12AM (local time) - 16ft (5.0m), 18s period, ENE swell with cross-onshore winds.
- Most powerful swell: Friday 7 Aug, 9PM (local time) - 36ft (11.0m), 14s period, N swell with 42,044 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 12AM (local time) - 16ft (5.0m), 18s 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 Thursday (Aug 06) at 12AM. The primary swell is predicted to be 5.0m and 18s 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 11.0m 14s and forecast to arrive on Friday (Aug 07) at 9PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 13.0m 14s period and expected on Saturday (Aug 08) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 6th Aug) | 16ft (5.0m) 18s |
| Best Surf | 12AM (Thu 6th Aug) | 16ft (5.0m) 18s |
| Most Powerful | 9PM (Fri 7th Aug) | 36ft (11.0m) 14s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, this is Rusty.
Well, it’s a familiar story for Aha Rivermouth. We’ve got a whole lot of nothing coming our way for the rest of August. There’s not a single stand-out day in the next 16 days, and you are going to be staring at a long stretch of flat or blown-out conditions.
Right now, the water is sitting at a balmy 86°F, which is a touch warmer than normal for this time of year. The only ripple of energy we get comes in early next week, but it’s a cruel tease. By Tuesday, August 5th, a giant easterly swell is going to jack up to 10 ft, with a very long period of 18 seconds. That’s a heap of energy, but it’s also going to be far too big for this spot. The onshore wind will be howling at 16 mph from the north-northeast, making it a messy, dangerous affair for experts only. By Wednesday, August 6th, it’s full-on storm surf, with 20 ft+ waves and gale-force winds. This setup looks far more interesting for kite surfing than any kind of paddle surfing, honestly.
After that storm passes, the swell completely collapses. From Sunday, August 10th, onwards through the middle of the month, we’re looking at tiny, weak swells under 3 ft. The wind does swing offshore from the south-southeast for a few days after the 9th, keeping things clean, but there’s simply no wave to ride. It’ll be a glassy, flat ocean.
There is one small flicker of hope right at the end of the outlook. On Saturday morning, August 15th, we have a 3 ft easterly swell with a light 6 mph offshore wind from the west-northwest. That’s about the best we can hope for, a clean, knee-high wave for a few hours.
Overall, this is a near-total blank run for Aha Rivermouth. If you’re desperate, maybe check the river mouth itself on the morning of the 15th, but otherwise, it’s a time for gear repairs and watching the forecasts for a change.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Tue morning. Warm (max 30°C on Sun afternoon, min 29°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 186mm), heaviest during Fri afternoon. Warm (max 30°C on Wed morning, min 28°C on Fri morning). Winds increasing (moderate winds from the NNE on Wed morning, extremely windy from the N by Fri afternoon). | ||||||||||||||||||||
Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | |||||||||||||||
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) | E 16 | E 17 | E 16 | E 15 | E 16 | E 16 | E 17 | E 17 | E 17 | E 18 | E 18 | ENE 18 | E 19 | E 19 | ENE 18 | ENE 17 | N 13 | NNE 13 | NNW 11 | NNW 11 | S 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 78 | 214 | 496 | 674 | 989 | 1101 | 1502 | 1879 | 3443 | 5221 | 6867 | 15959 | 23205 | 26897 | 35615 | 34183 | 41836 | 8351 | 3445 | 916 | 0 |
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-on | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross | cross | cross-off |
High Tide | 9:13PM1.94m | 9:12AM1.92m | 9:43PM1.92m | 9:57AM1.81m | 10:16PM1.89m | 10:52AM1.67m | 10:55PM1.84m | 12:07PM1.52m | 11:45PM1.78m | 2:06PM1.45m | 00:58AM1.73m | 4:10PM1.52m | 2:34AM1.74m | ||||||||
Low Tide | 2:54PM0.40m | 3:13AM0.68m | 3:27PM0.52m | 3:54AM0.64m | 4:02PM0.68m | 4:44AM0.64m | 4:41PM0.86m | 5:46AM0.65m | 5:31PM1.05m | 7:08AM0.65m | 6:49PM1.21m | 8:43AM0.59m | 8:47PM1.28m | ||||||||
 | |  | |  |  |  | | | | | | | | | | | | | | | |
 | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — |
 | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:10 | — | — | 7:09 | — | — | 7:09 | — |
mm | — | — | — | — | — | 1 | 5 | 1 | 4 | 1 | 1 | — | 2 | 3 | 17 | 42 | 104 | 16 | 11 | 87 | 200 |
Temp °C | 29 | 30 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 29 | 28 |
Feels °C | 32 | 33 | 32 | 31 | 32 | 33 | 33 | 32 | 33 | 31 | 30 | 28 | 26 | 23 | 22 | 16 | 11 | 25 | 28 | 11 | 8 |
Swell 1 Height (m) Direction Period (s) | E 16 | E 17 | E 16 | E 15 | E 16 | E 16 | E 17 | E 17 | E 17 | E 18 | E 18 | ENE 18 | E 19 | E 19 | ENE 18 | ENE 17 | ENE 16 | NNE 13 | NNW 11 | NNW 11 | — |
| kJ | 78 | 214 | 496 | 674 | 989 | 1101 | 1502 | 1879 | 3443 | 5221 | 6867 | 15959 | 23205 | 26897 | 35615 | 34183 | 21638 | 8351 | 3445 | 916 | — |
Swell 2 Height (m) Direction Period (s) | ESE 9 | ENE 9 | ESE 9 | S 7 | SSW 7 | S 7 | N 5 | SSE 8 | — | — | — | — | — | — | — | — | — | ENE 14 | S 10 | NW 15 | — |
| kJ | 8 | 7 | 8 | 4 | 5 | 4 | 12 | 13 | — | — | — | — | — | — | — | — | — | 4518 | 1639 | 314 | — |
Swell 3 Height (m) Direction Period (s) | E 9 | ESE 7 | S 7 | ESE 8 | E 15 | SE 8 | S 8 | — | — | — | — | — | — | — | — | — | — | SW 9 | E 11 | NNE 16 | — |
| kJ | 6 | 5 | 4 | 7 | 4 | 3 | 10 | — | — | — | — | — | — | — | — | — | — | 65 | 1733 | 164 | — |
Wind waves Height (m) Direction Period (s) | N 4 | — | ENE 8 | NE 8 | N 4 | N 4 | — | NNE 5 | — | — | NE 6 | — | N 8 | N 9 | N 10 | N 12 | N 13 | NW 12 | S 11 | S 12 | S 14 |
| kJ | 1 | — | 28 | 22 | 7 | 19 | — | 12 | — | — | 138 | — | 1015 | 2117 | 6061 | 16190 | 41836 | 6162 | 7480 | 25331 | 53503 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 75 | 30 | 30 | 31 | 31 | 31 | 40 | 40 | 40 | 40 | 801 | 673 | 693 | 861 | 673 | 815 | 801 | 801 | 66 | 801 | 801 |
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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