
Surf Forecasts:
Aha Rivermouth surf forecast from 3 Aug 2026:
- Best quality surf: Thursday 6 Aug, 6AM (local time) - 16ft (5.0m), 18s period, E swell with cross-onshore winds.
- Most powerful swell: Friday 7 Aug, 9PM (local time) - 41ft (12.5m), 14s period, N swell with 62,036 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 6AM (local time) - 16ft (5.0m), 18s period with E 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 6AM. The primary swell is predicted to be 5.0m and 18s period with a secondary swell of 2.5m and 8s. 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 12.5m 14s and forecast to arrive on Friday (Aug 07) 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 13.0m 14s period and expected on Sunday (Aug 09) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 6th Aug) | 16ft (5.0m) 18s |
| Best Surf | 6AM (Thu 6th Aug) | 16ft (5.0m) 18s |
| Most Powerful | 9PM (Fri 7th Aug) | 41ft (12.5m) 14s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's talk about what's on the menu for the next couple of weeks.
We've got one spot on the radar, Aha Rivermouth, and honestly, it's a tough run. The next 16 days start with a real dry spell. The first few days are a complete write-off – poor conditions, raw onshore winds, and the swell is just not cooperating. We’re looking at a gap from now until about the 11th of August where there's nothing worth paddling out for.
The water is sitting at a warm 87°, which is a touch warmer than usual for this time of year, a nice little bonus if you're in the water.
Now, the only real glimmer of hope comes in on Tuesday, the 11th of August. Early morning, the wind swings offshore from the SSW, a moderate breeze, and the forecast is calling for "very good surf conditions." The swell is a modest 4 ft, but it's a long-period 13-second groundswell pushing in from the ENE. That longer period means better shaped waves and more energy, but at a beach/jetty setup like this, it can sometimes break a bit straight. The combined energy is moderate at 507, so there's some push behind it. This is your best bet, but it's a one-off window. The afternoon drops off quickly with marginal conditions.
After that, we're back into a long stretch of poor or marginal surf for the rest of the forecast period. There's a bump in swell on the 17th of August, with a 4 ft ENE swell and a cross-offshore wind, but it's still only rated as marginal due to tide issues. Everything else is small, choppy, or blown out. The end of the run, around the 16th, sees the swell drop to under 2 ft with combined energy under 100, just weak, small waves.
So, bottom line: if you're desperate, mark Tuesday morning, the 11th of August. It's not a classic, but it's the only clean window we've got. The rest of the outlook is a solid bust.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Wed morning. Warm (max 30°C on Mon afternoon, min 28°C on Tue night). Winds increasing (light winds from the NE on Tue morning, near gales from the N by Thu morning). | Days 5-7 Weather SummaryHeavy rain (total 392mm), heaviest during Fri afternoon. Warm (max 30°C on Fri night, min 28°C on Fri morning). Winds decreasing (extremely windy from the NNE on Fri night, moderate winds from the WNW by Sat afternoon). | |||||||||||||||||||
Mon 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
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 16 | E 17 | E 17 | E 17 | E 17 | E 18 | ENE 18 | E 18 | E 17 | ENE 17 | ENE 17 | N 13 | N 14 | N 12 | N 11 | SSW 13 | SSW 14 | SSW 14 | E 14 |
Wave Graph | ||||||||||||||||||||
984 | 1101 | 1696 | 1901 | 3404 | 4231 | 6833 | 13054 | 17450 | 19881 | 25651 | 26371 | 26724 | 37424 | 4967 | 1665 | 0 | 0 | 0 | 144 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | off | off | off | off |
High Tide | 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 | 5:16PM1.66m | ||||||||
Low Tide | 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 | 10:05AM0.46m | 10:21PM1.21m | |||||||
— | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | |
7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:10 | — | — | 7:09 | — | — | 7:09 | — | — | 7:08 | — | |
mm | — | 2 | 2 | 1 | 3 | 2 | — | 2 | 1 | 3 | 13 | 25 | 121 | 120 | 7 | 4 | 10 | 89 | 80 | 16 |
Temp °C | 30 | 29 | 30 | 30 | 29 | 30 | 30 | 29 | 30 | 29 | 29 | 28 | 29 | 30 | 30 | 30 | 30 | 29 | 29 | 29 |
Feels °C | 32 | 31 | 32 | 32 | 31 | 31 | 30 | 29 | 27 | 24 | 23 | 15 | 11 | 20 | 26 | 31 | 33 | 13 | 15 | 19 |
Swell 1 Height (m) Direction Period (s) | E 16 | E 16 | E 17 | E 17 | E 17 | E 17 | E 18 | ENE 18 | E 18 | E 17 | ENE 17 | ENE 17 | ENE 16 | ENE 14 | N 12 | N 11 | — | — | — | E 14 |
984 | 1101 | 1696 | 1901 | 3404 | 4231 | 6833 | 13054 | 17450 | 19881 | 25651 | 26371 | 25073 | 12016 | 4967 | 1665 | — | — | — | 101 | |
Swell 2 Height (m) Direction Period (s) | S 7 | S 7 | S 8 | SSE 8 | — | — | S 7 | — | — | — | — | — | — | N 13 | ENE 12 | ENE 11 | — | — | — | E 14 |
4 | 4 | 10 | 13 | — | — | 17 | — | — | — | — | — | — | 5866 | 1517 | 622 | — | — | — | 144 | |
Swell 3 Height (m) Direction Period (s) | E 15 | SE 8 | — | — | — | — | — | — | — | — | — | — | — | — | S 10 | NW 11 | — | — | — | — |
4 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | 422 | 344 | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | W 7 | N 4 | NE 4 | NNE 5 | — | NE 6 | — | — | NNE 8 | N 9 | N 10 | N 11 | N 13 | N 14 | WNW 11 | SSW 11 | SSW 13 | SSW 14 | SSW 14 | SW 14 |
4 | 12 | 20 | 14 | — | 64 | — | — | 1101 | 2023 | 5098 | 12856 | 26724 | 37424 | 2015 | 5528 | 38513 | 61294 | 55390 | 35924 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 31 | 40 | 40 | 40 | 40 | 673 | 673 | 928 | 801 | 673 | 1233 | 696 | 801 | 815 | 801 | 801 | 815 | 687 | 683 |
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.











