
Surf Forecasts:
Aha Rivermouth surf forecast from 20 Jul 2026:
- Best quality surf: Wednesday 22 Jul, 9AM (local time) - 1.5ft (0.5m), 9s period, E swell with glassy winds.
- Most powerful swell: Sunday 26 Jul, 3PM (local time) - 8ft (2.4m), 11s period, SE swell with 1,388 kJ wave energy.
- Next surfable swell (1★+): Wednesday 22 Jul, 9AM (local time) - 1.5ft (0.5m), 9s 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 Wednesday (Jul 22) at 9AM. The primary swell is predicted to be 0.5m and 9s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 2.4m 11s and forecast to arrive on Sunday (Jul 26) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 13s period and expected on Monday (Jul 27) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 22nd Jul) | 1.5ft (0.5m) 9s |
| Best Surf | 9AM (Wed 22nd Jul) | 1.5ft (0.5m) 9s |
| Most Powerful | 3PM (Sun 26th Jul) | 8ft (2.4m) 11s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's look at what's on the menu for the next couple of weeks. I've got to be straight with you right off the bat: we're in for a long, quiet run. The first real opportunity to paddle out isn't until Wednesday morning, July 22nd, and even then, it's not going to have anyone hooting from the beach.
The setup is at Aha Rivermouth. It's a beach and jetty combo, and it's fairly consistent, but that doesn't mean much when the swell is this small. We're looking at a tiny 2ft wave from the east with a 9-second period, which is short-period, windswell stuff. The combined energy is weak (58). The saving grace on Wednesday morning the 22nd is the wind – it's glassy, and that's a huge positive for a spot that usually gets a bit of a breeze. The water is sitting at 83°F and is about normal for the time of year. It's small, but it's clean. For a beginner, it's a good day to get wet, but there's not enough power to get excited about.
After that brief window, we drop back into nothing. From Thursday the 23rd right through to the end of the month, the forecast is a write-off. The swell hovers around 1ft to 2ft, but the winds turn mostly cross-on or onshore, making it choppy and messy. The energy stays weak, and the comments tell the story: "poor surf conditions." We’ve got a solid week of flat, junky surf ahead.
Then, on Sunday, July 26th, the swell tries to show up. The swell height jumps to 6ft in the morning and 8ft in the afternoon, coming from the southeast with a moderate 10-11 second period. The combined energy is strong (684 in the morning, 2369 by afternoon). That's a lot of water moving around. But here's the catch: the wind is howling at 16 mph from the ESE, creating a messy cross-chop. The forecast says "marginal" at best, and with that much wind and that size, this is more of a kite-surfing setup than a paddling one. It's not the clean, lined-up wave we're after. For a beach break, the long-period swell and side-shore wind will just make it a washing machine. That's expert territory only, and even then, it's not recommended.
After that one pulse, it's all over. The first week of August is back to tiny, weak swells with strong cross or onshore winds. The energy is a bit higher (116 on August 3rd), but it's all wind-chop with a 1ft wave. Nothing to hang your hat on.
So, the short story: if you're desperate, Wednesday morning July 22nd is the pick of a very poor bunch. It's small and clean. Everything else in the next 16 days is either flat, blown out, or both. It's a tough stretch. Hang loose, and maybe give the board a wax for the next system.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed afternoon. Warm (max 30°C on Mon afternoon, min 27°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Thu afternoon. Warm (max 29°C on Thu afternoon, min 27°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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) | ENE 10 | E 10 | E 9 | E 9 | E 9 | E 9 | NE 12 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | SE 8 | SE 10 | SE 10 | SE 11 | ENE 9 |
Wave Graph | ||||||||||||||||||||
30 | 47 | 43 | 42 | 42 | 41 | 41 | 47 | 69 | 78 | 56 | 56 | 55 | 38 | 29 | 63 | 459 | 626 | 1388 | 15 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | cross-off | off | glassy | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross |
High Tide | 10:57PM1.84m | 11:20AM1.55m | 11:36PM1.77m | 12:35PM1.40m | 00:23AM1.70m | 2:37PM1.34m | 1:24AM1.65m | 4:44PM1.40m | 2:40AM1.63m | 5:45PM1.51m | 3:50AM1.65m | 6:21PM1.62m | ||||||||
Low Tide | 4:36PM0.67m | 5:26AM0.75m | 5:13PM0.86m | 6:30AM0.78m | 5:55PM1.04m | 7:49AM0.79m | 6:57PM1.19m | 9:14AM0.74m | 8:43PM1.29m | 10:24AM0.65m | 10:23PM1.29m | 11:13AM0.54m | 11:23PM1.24m | |||||||
— | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | |
7:21 | — | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | |
mm | — | — | — | — | — | — | 1 | — | — | 2 | — | — | 2 | — | — | — | 1 | 2 | 3 | 5 |
Temp °C | 30 | 28 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 29 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 27 |
Feels °C | 34 | 32 | 33 | 33 | 35 | 33 | 34 | 33 | 34 | 33 | 32 | 32 | 32 | 31 | 31 | 30 | 30 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | W 7 | E 10 | E 9 | E 9 | E 9 | E 9 | E 9 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | SE 8 | SE 10 | ENE 9 | SE 11 | ENE 9 |
25 | 47 | 43 | 42 | 42 | 41 | 41 | 47 | 69 | 78 | 56 | 56 | 55 | 38 | 29 | 63 | 459 | 16 | 1388 | 15 | |
Swell 2 Height (m) Direction Period (s) | ENE 10 | W 6 | W 8 | W 7 | W 6 | W 6 | NE 12 | ENE 8 | W 6 | W 6 | ESE 10 | W 6 | S 8 | SE 11 | SE 8 | ENE 9 | ENE 9 | ESE 15 | SE 15 | ENE 9 |
30 | 13 | 21 | 17 | 13 | 7 | 39 | 13 | 6 | 3 | 10 | 2 | 5 | 19 | 17 | 28 | 28 | 21 | 9 | 15 | |
Swell 3 Height (m) Direction Period (s) | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | ENE 13 | W 6 | W 6 | SE 10 | ESE 10 | W 6 | ESE 9 | W 5 | S 8 | S 9 | SE 10 | ESE 15 | ESE 15 | — | — |
12 | 17 | 12 | 7 | 7 | 17 | 7 | 7 | 4 | 10 | 3 | 9 | 2 | 4 | 14 | 17 | 22 | 21 | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | E 3 | E 3 | — | — | SE 10 | SE 11 | SSE 12 |
— | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | 626 | 972 | 1783 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 12 | 12 | 12 | 12 | 12 | 0 | 0 | 0 | 0 | 12 | 12 | 12 | 12 | 596 | 596 | 70 | 70 | 70 | 70 | 70 |
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.










