Surf Forecasts:
Aha Rivermouth surf forecast from 5 Sep 2026:
- Most powerful swell: Monday 7 Sep, 12AM (local time) - 7ft (2.2m), 7s period, NNE swell with 500 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 2.2m 7s and forecast to arrive on Monday (Sep 07) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 9s period and expected on Saturday (Sep 12) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12AM (Mon 7th Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, Rusty here again. Let’s break down what’s happening at Aha Rivermouth. The outlook is a tough one, mate. Over the entire 16-day stretch, there’s not a single session that’s worth paddling out for. The conditions are consistently poor, and it’s a long dry spell. This kind of blank run can happen here, so it’s not a surprise, but it’s a bummer.
Starting off on Saturday the 5th, we’ve got a tiny 0.5ft north swell with weak energy (154), but a stormy cross-offshore wind at 19 mph has it looking nasty. Sunday the 6th sees the swell jump to 5ft from the northeast with moderate energy (370), but the wind is onshore and strong, making it a blown-out mess. Through Monday the 7th and into the week, the wind stays cross-onshore and lumpy, with swell holding around 5ft to 6ft, and the energy climbs a bit (483 to 501 to 524), but it’s wasted on the rough conditions.
By Thursday the 10th, the swell drops to 3ft onshore, with weak energy (139) and short period. The weekend of the 12th and 13th brings a shift to southeast and east swells, and we get some longer 14-second periods on Sunday, but the swell is tiny (2ft) and the cross-onshore winds keep it choppy. The energy is moderate (305 to 280), but the wave state is still poor.
The second week is more of the same. Tuesday the 15th has a 5ft east swell with moderate energy (364), but the wind is cross-shore and the period is short (8 seconds), so it won’t shape up. By the end of the window, we’re looking at 2ft to 3ft east swells with gentle breezes, but the wind stays cross-onshore, keeping it choppy. The water temperature is a warm 83°F, which is about average for this time of year.
Plain and simple: there’s no good surf on offer. No standout days, no clean windows. If you’re keen, you might find a knee-high bump on the 15th, but the wind will be a problem. For the rest of us, it’s a time to hang loose and wait for a better forecast. Things can change, but right now, it’s a long wait.
Rusty.
Short Range ForecastHeavy rain (total 78mm), heaviest during Sat night. Warm (max 28°C on Sat afternoon, min 26°C on Sat night). Mainly strong winds. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Thu morning. Warm (max 28°C on Thu morning, min 26°C on Wed morning). Mainly fresh winds. | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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 10 | E 6 | NE 9 | NNE 8 | NNE 7 | N 8 | NNW 9 | NNW 9 | N 9 | NNW 9 | N 8 | N 7 | N 7 | N 7 | NNW 7 | NNW 9 | N 10 | N 9 | N 9 | N 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 121 | 369 | 370 | 274 | 500 | 260 | 297 | 348 | 442 | 453 | 212 | 209 | 176 | 92 | 77 | 348 | 347 | 241 | 157 | 86 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross | cross-on | cross | cross |
High Tide | 00:22AM1.66m | 4:12PM1.54m | 2:30AM1.65m | 5:03PM1.68m | 4:01AM1.76m | 5:38PM1.80m | 5:01AM1.91m | 6:08PM1.90m | 5:49AM2.03m | 6:36PM1.98m | 6:31AM2.10m | 7:02PM2.03m | ||||||||
Low Tide | 6:28PM1.30m | 8:28AM0.61m | 9:01PM1.29m | 9:55AM0.51m | 10:26PM1.13m | 10:54AM0.40m | 11:15PM0.94m | 11:40AM0.32m | 11:55PM0.76m | 12:17PM0.29m | 00:30AM0.59m | 12:51PM0.31m | 1:04AM0.46m | |||||||
 |  |  | |  | | | | | |  |  | | | | | | | | | |
 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:36 | — |
mm | 23 | 53 | — | 2 | — | — | — | — | — | — | — | 2 | 1 | — | 3 | 1 | — | 1 | 2 | 3 |
Temp °C | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 29 | 29 | 29 | 29 | 27 | 28 | 29 | 28 | 27 | 26 | 26 | 26 | 27 | 27 | 30 | 30 | 31 | 30 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | W 7 | WNW 7 | SSW 8 | SSW 9 | E 9 | NE 8 | NE 10 | NE 10 | NE 10 | NE 9 | NE 8 | ENE 8 | ENE 8 | NE 8 | NNW 7 | NNW 9 | N 10 | N 9 | N 9 | N 8 |
| kJ | 94 | 55 | 57 | 79 | 93 | 109 | 173 | 122 | 46 | 41 | 35 | 44 | 23 | 14 | 77 | 348 | 347 | 241 | 157 | 86 |
Swell 2 Height (m) Direction Period (s) | N 10 | S 8 | SSE 8 | E 9 | S 9 | S 9 | SSE 10 | SSE 8 | E 9 | E 10 | S 8 | E 9 | E 9 | E 9 | E 9 | ENE 9 | E 9 | E 9 | ENE 15 | ENE 14 |
| kJ | 121 | 44 | 23 | 80 | 63 | 58 | 32 | 20 | 13 | 30 | 20 | 15 | 26 | 25 | 40 | 61 | 40 | 40 | 43 | 64 |
Swell 3 Height (m) Direction Period (s) | ENE 10 | N 11 | W 7 | N 10 | NE 13 | E 8 | E 9 | E 8 | SSE 8 | SSE 9 | E 9 | S 8 | S 8 | S 8 | S 7 | S 7 | SSE 8 | ENE 8 | NE 8 | S 8 |
| kJ | 33 | 55 | 4 | 17 | 7 | 21 | 13 | 12 | 14 | 15 | 14 | 10 | 11 | 10 | 9 | 9 | 13 | 27 | 11 | 10 |
Wind waves Height (m) Direction Period (s) | S 8 | E 6 | NE 9 | NNE 8 | NNE 7 | N 8 | NNW 9 | NNW 9 | N 9 | NNW 9 | N 8 | N 7 | N 7 | N 7 | NE 7 | ENE 7 | — | SSE 4 | E 9 | ESE 5 |
| kJ | 289 | 369 | 370 | 274 | 500 | 260 | 297 | 348 | 442 | 453 | 212 | 209 | 176 | 92 | 22 | 29 | — | 1 | 76 | 39 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 78 | 717 | 815 | 801 | 690 | 595 | 75 | 90 | 595 | 746 | 595 | 595 | 595 | 919 | 40 | 66 | 12 | 66 | 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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