Surf Forecasts:
Aha Rivermouth surf forecast from 10 Sep 2026:
- Best quality surf: Friday 11 Sep, 12AM (local time) - 3.5ft (1.1m), 9s period, N swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 12AM (local time) - 4.5ft (1.3m), 10s period, ESE swell with 315 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 12AM (local time) - 3.5ft (1.1m), 9s period with N 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 Friday (Sep 11) at 12AM. The primary swell is predicted to be 1.1m and 9s period with a secondary swell of 0.4m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 1.3m 10s and forecast to arrive on Wednesday (Sep 16) at 12AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Wednesday (Sep 16) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 11th Sep) | 3.5ft (1.1m) 9s |
| Best Surf | 12AM (Fri 11th Sep) | 3.5ft (1.1m) 9s |
| Most Powerful | 12AM (Wed 16th Sep) | 4.5ft (1.3m) 10s |
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 table.
Honestly, it’s a tough run ahead for Aha Rivermouth. Over the next 16 days, there’s not a single session that stands up as a goer. The whole picture is grim – nearly every single slot is marked as poor surf conditions, with hardly a window where the wind and swell line up. You’re looking at a long, frustrating stretch with practically no real surf on offer.
Let’s break it down. The first possible mention is Thursday the 10th of September afternoon, but even then, it’s marginal. We’ve got a 5ft swell from the north, period around 9 seconds, but the wind is cross-on from the north at 6 mph, which isn’t doing it any favours. The combined energy is moderate (375), but the water temp is 83° – about average for this time of year – and the wave comment says it’s marginal or questionable tide conditions. Not worth paddling out for.
From there, it’s a dead zone. Friday the 11th through to almost the end of the period is just poor conditions day after day. Winds are mostly cross or cross-on, often moderate to fresh, and the swell heights drop right down to 2ft or 1ft with short periods. The combined energy drops to very weak numbers, like 40 or 35 towards the end of the month. There’s a little bump in size around the 19th and 20th of September when a 7ft to 10ft east swell shows up with a very long period (16-18 seconds), but the wind is howling – near gale from the north-northeast at 31 mph. That’s blown out, lumpy, and only for experts if anyone’s stupid enough. The combined energy hits 4646, which is strong, but with that wind, it’s a kite-surfing circus, not a surfer’s wave.
There’s a tiny flicker right at the end on Friday the 25th of September – a 5ft to 7ft swell from the east-southeast with 10-second period and light offshore north-northeast wind at 9 mph. The combined energy climbs back to moderate to strong (403 and 757), but the wave comment still says poor surf conditions. Even so, if I had to pick the only potential window, that Friday afternoon might be the least worst – but I wouldn’t hold my breath.
Honestly, this is a blank run. Aha Rivermouth is a beach and jetty setup that can work with the right swell from the northeast, but nothing in this forecast delivers. The consistency is “fairly consistent” normally, but this stretch is a write-off. Forecasts can change, but right now, there’s no surf worth chasing.
Stay patient, mate. Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Fri afternoon. Warm (max 28°C on Thu afternoon, min 27°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 29mm), heaviest during Mon afternoon. Warm (max 28°C on Tue morning, min 27°C on Sun afternoon). Wind will be generally light. | |||||||||||||||||||
Thu 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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) | N 9 | N 9 | NNW 8 | NNW 8 | ENE 14 | E 14 | E 14 | E 14 | E 14 | E 14 | E 8 | E 8 | E 9 | E 9 | ESE 9 | ESE 9 | ESE 10 | E 10 | E 10 | ENE 14 |
Wave Graph  | ||||||||||||||||||||
 kJ | 339 | 194 | 115 | 81 | 64 | 101 | 103 | 103 | 97 | 101 | 168 | 223 | 252 | 230 | 300 | 254 | 315 | 146 | 146 | 160 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-on | cross | cross | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross-on | cross-on |
High Tide | 6:36PM1.98m | 6:31AM2.10m | 7:02PM2.03m | 7:09AM2.12m | 7:28PM2.07m | 7:44AM2.08m | 7:53PM2.07m | 8:19AM1.99m | 8:18PM2.05m | 8:53AM1.87m | 8:43PM1.99m | 9:28AM1.73m | 9:07PM1.91m | |||||||
Low Tide | 00:30AM0.59m | 12:51PM0.31m | 1:04AM0.46m | 1:22PM0.37m | 1:36AM0.38m | 1:50PM0.46m | 2:09AM0.35m | 2:16PM0.58m | 2:41AM0.37m | 2:41PM0.71m | 3:14AM0.43m | 3:04PM0.85m | ||||||||
 |  |  | |  | | | | | | | | | | | | | | |  | |
 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — |
mm | — | — | 1 | 4 | 1 | — | — | — | 2 | 2 | 3 | 2 | 6 | 7 | 5 | 1 | 3 | — | — | 2 |
Temp °C | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 28 |
Feels °C | 33 | 33 | 31 | 31 | 30 | 31 | 30 | 29 | 28 | 28 | 29 | 27 | 27 | 28 | 31 | 31 | 30 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | N 9 | N 9 | NNW 8 | NNW 8 | N 7 | N 7 | N 7 | E 14 | E 14 | E 14 | E 13 | E 8 | E 9 | E 9 | ENE 12 | ESE 9 | E 10 | E 10 | E 10 | E 9 |
| kJ | 339 | 194 | 115 | 81 | 40 | 26 | 24 | 103 | 97 | 101 | 92 | 223 | 252 | 230 | 51 | 254 | 226 | 146 | 146 | 139 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | ESE 7 | ESE 8 | ESE 7 | ENE 14 | E 14 | E 14 | NNW 6 | ESE 9 | ESE 8 | N 5 | E 13 | E 13 | E 13 | N 4 | ENE 12 | ENE 12 | ENE 14 | E 14 | ENE 14 |
| kJ | 27 | 15 | 58 | 42 | 64 | 101 | 103 | 13 | 28 | 39 | 5 | 89 | 87 | 86 | 1 | 49 | 50 | 107 | 96 | 160 |
Swell 3 Height (m) Direction Period (s) | ESE 7 | SE 9 | ENE 15 | ENE 15 | S 7 | S 7 | S 7 | S 7 | N 6 | N 6 | S 7 | S 7 | N 4 | N 4 | SW 9 | ENE 16 | NNW 7 | NNW 6 | SSE 5 | NNW 6 |
| kJ | 9 | 20 | 44 | 43 | 4 | 8 | 8 | 8 | 12 | 11 | 4 | 3 | 4 | 3 | 3 | 24 | 5 | 12 | 11 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | SE 4 | — | SE 6 | SE 6 | SE 6 | E 5 | E 6 | E 6 | E 8 | N 5 | — | — | ESE 9 | S 7 | ESE 10 | SSE 5 | — | — |
| kJ | — | — | 3 | — | 54 | 52 | 34 | 39 | 64 | 91 | 168 | 2 | — | — | 300 | 1 | 315 | 17 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 40 | 0 | 12 | 12 | 12 | 66 | 66 | 70 | 70 | 70 | 595 | 40 | 595 | 12 | 12 | 12 | 12 | 12 | 12 | 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.
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