
Surf Forecasts:
Aha Rivermouth surf forecast from 21 Jul 2026:
- Best quality surf: Wednesday 22 Jul, 6AM (local time) - 1.5ft (0.5m), 9s period, E swell with glassy winds.
- Most powerful swell: Thursday 23 Jul, 3AM (local time) - 2.5ft (0.7m), 11s period, ENE swell with 103 kJ wave energy.
- Next surfable swell (1★+): Wednesday 22 Jul, 6AM (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 6AM. 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 0.7m 11s and forecast to arrive on Thursday (Jul 23) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 9s period and expected on Tuesday (Jul 28) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 22nd Jul) | 1.5ft (0.5m) 9s |
| Best Surf | 6AM (Wed 22nd Jul) | 1.5ft (0.5m) 9s |
| Most Powerful | 3AM (Thu 23rd Jul) | 2.5ft (0.7m) 11s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's on the menu for Aha Rivermouth.
Honestly, the next couple of weeks look pretty grim for a paddle. We’ve got a long stretch of tiny, weak swell and messy wind, so don't get your hopes up for anything decent for a while. The first real sniff of anything interesting doesn't come until the very end of the month, and that's a long way off.
The water temp is sitting at about 84°, which is about normal for this time of year.
Looking at the start, from Tuesday the 21st right through to the end of July, it's a write-off. The swell is tiny, mostly around 1ft to 2ft, with a short period of 7 to 10 seconds, meaning weak, gutless waves. The combined energy is pitiful, mostly in the 40s and 80s (weak energy). On top of that, the wind is mostly cross or cross-onshore, making it choppy and messy. There’s a brief window on the Friday morning, the 24th, with clean conditions and a cross-offshore breeze, but the swell is still only about 2ft. It’s surfable, but very ordinary.
The situation doesn't improve much into the first week of August. The wind gets nasty, with strong breezes and even a risk of thunderstorms. The swell stays small and weak until the 31st of July. On that Friday afternoon, we finally see a pulse of energy, with a 2ft swell from the ESE and a 13-second period, pushing the combined energy up to 207 (moderate energy). The wind is cross-offshore and clean. It’s still only a marginal call, but it's the first glimmer of life.
The real event, if you can call it that, is on the 1st and 2nd of August. A big groundswell from the ESE rolls in, with a very long period of 14-15 seconds. On the Saturday morning, the 1st, it’s about 5ft but the wind is a strong cross-onshore, making it a total mess. By Sunday the 2nd, the swell is pushing 7ft to 8ft, and the combined energy is massive, in the 1800s (strong wave energy). The wind is a gentle cross-shore, but the surf is still marginal, likely due to the size and period. This is a big, powerful swell, but with a 15-second period, it’s a groundswell that might break too straight and fat on a beach break like this.
The Standout: The best bet on offer is the Monday morning, the 3rd of August. We’ve got a massive 12ft swell from the east, with a 15-second period. The combined energy is a whopping 5421 (very strong wave energy). The wind is a gentle cross-onshore, but the file says it's too big for this break. For a surfer with experience, this is a serious, powerful swell. But the conditions are described as "wind and tide favorable, but the swell is predicted to be too big for this break." This is for experts only, and even then, it's a beast. The wave comment says "wind and tide favorable, but the swell is predicted to be too big for this break" which is a real shame. It’s a solid, powerful groundswell, but it’s likely going to be a washing machine.
So, to sum it up: there's a lot of small, windy, and poor surf ahead. The only real standout is a massive, expert-only swell on the 3rd of August, but it's likely too big for the break. Don't hold your breath for the rest of it.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Tue afternoon, min 27°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Mon morning. Warm (max 29°C on Fri afternoon, min 28°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | ||||||||||||||
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 9 | E 9 | NE 12 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | SE 7 | SE 7 | SE 10 | SE 10 | SE 10 | SE 11 | ESE 10 | SE 10 | ESE 10 |
Wave Graph | ||||||||||||||||||||
42 | 42 | 41 | 41 | 47 | 69 | 78 | 77 | 56 | 55 | 37 | 67 | 55 | 28 | 26 | 28 | 29 | 43 | 27 | 41 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | glassy | cross-on | cross-off | cross | cross | cross | cross-off | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross | cross |
High Tide | 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 | 4:44AM1.70m | 6:47PM1.70m | ||||||||
Low Tide | 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 | 11:51AM0.45m | 00:03AM1.17m | |||||||
— | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:48 | — | — | |
7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 3 |
Temp °C | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 28 | 29 | 28 | 28 | 28 | 28 |
Feels °C | 33 | 33 | 34 | 33 | 33 | 33 | 32 | 32 | 32 | 33 | 32 | 31 | 32 | 31 | 30 | 30 | 30 | 29 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 9 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | SE 7 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | S 10 | S 9 | SSE 8 |
42 | 42 | 41 | 41 | 47 | 69 | 78 | 77 | 56 | 55 | 37 | 37 | 27 | 119 | 90 | 92 | 68 | 145 | 127 | 118 | |
Swell 2 Height (m) Direction Period (s) | W 7 | W 6 | W 6 | NE 12 | ENE 8 | W 6 | ESE 10 | ESE 10 | ESE 9 | ESE 9 | SE 7 | ENE 9 | ENE 9 | SE 10 | SE 10 | SE 10 | SE 11 | ESE 10 | SE 10 | ESE 10 |
17 | 13 | 7 | 39 | 13 | 3 | 10 | 10 | 9 | 8 | 8 | 29 | 28 | 25 | 26 | 28 | 29 | 43 | 27 | 41 | |
Swell 3 Height (m) Direction Period (s) | SW 7 | SW 7 | ENE 13 | W 6 | W 6 | SE 10 | W 5 | S 7 | S 7 | S 8 | SE 11 | S 8 | SE 10 | ENE 9 | ENE 9 | ENE 9 | SSE 10 | ENE 8 | ENE 8 | ENE 8 |
7 | 7 | 17 | 6 | 3 | 4 | 2 | 4 | 4 | 4 | 19 | 12 | 26 | 28 | 16 | 16 | 36 | 14 | 14 | 7 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SE 3 | SE 5 | SE 7 | SE 7 | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | 1 | 12 | 67 | 55 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 17 | 12 | 0 | 12 | 0 | 12 | 12 | 12 | 0 | 12 | 596 | 70 | 70 | 68 | 68 | 70 | 70 | 70 | 935 | 596 |
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.










