
Surf Forecasts:
Aha Rivermouth surf forecast from 15 Jul 2026:
- Most powerful swell: Wednesday 22 Jul, 3PM (local time) - 2ft (0.6m), 12s period, ENE swell with 109 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 0.6m 12s and forecast to arrive on Wednesday (Jul 22) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 7s period and expected on Saturday (Jul 18) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Wed 22nd Jul) | 2ft (0.6m) 12s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
G’day, Rusty here. Look, I’ve gotta be straight with you—this stretch ain’t got much to offer for a paddle. The whole 16-day window is a pretty grim run of small, weak surf with no real standouts. We’re looking at a long gap of flat, poor conditions, so don’t get your hopes up.
Kicking off on Wednesday the 15th of July at Aha Rivermouth, we’ve got tiny 1ft waves from the east with a period of 9 seconds. The combined energy is weak as at just 15, and the water is sitting at 81°, which is a bit colder than normal for this time of year. The wind is light offshore in the morning, so it’s clean, but the surf is rubbish—nothing to get excited about. This same story drags on through Thursday, Friday, and Saturday, with swell staying under 2ft and energy barely cracking 30. It’s a total write-off.
Moving into the second week, things get a touch bigger but still poor. Monday the 20th of July has glassy conditions and 1ft waves, but it’s still weak. By Wednesday the 22nd, we finally see a little pulse—2ft from the ENE with a period of 12 seconds and energy hitting 109 (moderate). But the wind is cross-onshore, messing up the shape. Thursday the 23rd brings 2ft swell and energy up to 117, but it’s onshore or cross-onshore—still not worth the drive.
From the 24th through the 26th, it’s back to weak, choppy junk with wind picking up, and by the 27th, we’re looking at 2ft to 3ft but with onshore winds and energy around 121–133. This is a beach/jetty setup, so with the wind and poor quality, it’d be more interesting for kite surfing than paddle surfing.
The only real change comes at the very end of the window. On Tuesday the 28th of July, swell jumps to 6ft–7ft from the ESE, with a period of 14 seconds and very strong energy (1152–1875). But the wind is onshore and fresh, and the forecast says it’s still poor surf conditions. By Wednesday the 29th, it gets wild—13ft to 15ft swell with energy over 9000, but a near gale cross-onshore wind blows it out. That’s expert-only territory, and it’s not clean. On Thursday the 30th, we see 28ft swell from the north with energy at 26,679—that’s massive, but the wind is a severe gale cross-shore, and the wave comment says it’s too big for this break. The afternoon drops to 3ft but the wind is still nasty.
Honestly, there’s nothing here to recommend. The whole period is a bust—no standouts, just a lot of waiting. Forecasts can change, but for now, leave the board at home.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Wed afternoon, min 26°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 30°C on Sat afternoon, min 26°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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 9 | E 10 | E 9 | E 9 | E 10 | E 10 | E 10 | E 10 | E 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 10 | ENE 9 | ENE 9 | E 9 | E 9 | ENE 10 |
Wave Graph | |||||||||||||||||||||
15 | 17 | 13 | 26 | 29 | 29 | 17 | 16 | 17 | 18 | 18 | 18 | 30 | 29 | 28 | 31 | 29 | 28 | 42 | 44 | 51 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | cross-off | off | off | cross-off | off | off | cross-off | off | off | off | off | off | glassy | cross-off | cross | cross-on | cross |
High Tide | 8:03PM1.97m | 7:26AM2.13m | 8:38PM1.98m | 8:10AM2.09m | 9:13PM1.97m | 8:54AM2.00m | 9:47PM1.94m | 9:38AM1.88m | 10:21PM1.90m | 10:26AM1.72m | 10:57PM1.84m | 11:20AM1.55m | 11:36PM1.77m | ||||||||
Low Tide | 1:29PM0.03m | 1:38AM0.83m | 2:09PM0.07m | 2:20AM0.77m | 2:47PM0.17m | 3:02AM0.72m | 3:24PM0.31m | 3:46AM0.71m | 4:00PM0.48m | 4:33AM0.72m | 4:36PM0.67m | 5:26AM0.75m | 5:13PM0.86m | ||||||||
5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | |
— | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:21 | — | — | 7:20 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 28 | 29 | 30 | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 27 | 28 | 28 |
Feels °C | 31 | 32 | 31 | 32 | 32 | 31 | 32 | 31 | 32 | 31 | 33 | 32 | 31 | 32 | 31 | 33 | 33 | 33 | 31 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 8 | S 7 | E 9 | E 10 | E 10 | WSW 5 | WSW 6 | E 10 | SW 8 | ENE 10 | WSW 7 | ENE 10 | WSW 7 | WSW 7 | WSW 8 | WSW 7 | WSW 7 | WSW 7 | E 9 | WSW 8 |
41 | 28 | 17 | 26 | 29 | 29 | 28 | 31 | 17 | 16 | 18 | 77 | 30 | 76 | 61 | 50 | 36 | 43 | 31 | 44 | 38 | |
Swell 2 Height (m) Direction Period (s) | E 9 | E 10 | E 9 | SW 10 | S 7 | S 7 | E 10 | E 10 | ESE 9 | ENE 10 | SE 8 | ENE 10 | SW 8 | ENE 9 | ENE 9 | ENE 10 | ENE 9 | ENE 9 | E 9 | WSW 7 | ENE 10 |
15 | 17 | 13 | 15 | 9 | 9 | 17 | 16 | 8 | 18 | 11 | 18 | 17 | 29 | 28 | 31 | 29 | 28 | 42 | 21 | 51 | |
Swell 3 Height (m) Direction Period (s) | SW 10 | SW 10 | SW 10 | S 7 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SE 9 | S 6 | ESE 8 | SE 9 | SW 9 | SSW 8 | SE 9 | W 8 | SE 8 | SW 9 | SW 9 | S 7 |
16 | 24 | 14 | 9 | 14 | 13 | 12 | 12 | 11 | 12 | 1 | 6 | 3 | 12 | 7 | 3 | 5 | 3 | 3 | 13 | 4 | |
Wind waves Height (m) Direction Period (s) | WSW 4 | W 5 | WSW 5 | WSW 5 | W 5 | W 5 | SW 4 | SW 5 | WSW 6 | WSW 8 | WSW 7 | SW 8 | WSW 8 | SW 8 | — | SW 8 | — | — | — | — | — |
7 | 13 | 13 | 25 | 18 | 21 | 12 | 12 | 42 | 83 | 99 | 46 | 83 | 54 | — | 45 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 627 | 627 | 627 | 17 | 639 | 627 | 596 | 605 | 596 | 596 | 627 | 596 | 596 | 17 | 17 | 17 | 17 | 75 | 17 | 68 | 12 |
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.










