Surf Forecasts:
Aha Rivermouth surf forecast from 11 Jul 2026:
- Most powerful swell: Saturday 18 Jul, 3PM (local time) - 1.5ft (0.5m), 10s period, E swell with 46 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 0.5m 10s and forecast to arrive on Saturday (Jul 18) at 3PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 6.5m 14s period and expected on Saturday (Jul 11) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Sat 18th Jul) | 1.5ft (0.5m) 10s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Alright, Rusty here. Let’s look at the only spot in the picture for the next 16 days: Aha Rivermouth.
I’ll be honest, this is a long, slow burn. The first week is a total dud. From Saturday the 11th all the way through the end of Thursday the 17th, the swell is barely a whisper, with combined energy under 40 (weak). You’re looking at knee-high dribble at best. Even though the winds are often clean, and some days are glassy, there’s just no juice. It’s a real tease.
The water temp is 83°F – right on average for the season, so at least you won’t freeze while you wait.
Things start to show a little life from Friday the 18th, but it’s still marginal. The real action kicks off Sunday the 19th. A pulse of short-period, wind-whipped swell hits from the ESE, climbing to 4ft by the morning and jumping to 7ft by the afternoon. The combined energy hits 373 (moderate), but the wind is a fresh cross-onshore at 22 mph, making it lumpy and ugly. This is messy, powerful stuff – this setup looks more interesting for kite surfing than paddle surfing.
The best bet, and it’s a big “maybe”, is Saturday the 25th. The swell bumps up to 7ft from the E, with a combined energy of 639 (moderate-strong). The wind is light, barely a breath at 3 mph. That’s a rare clean moment for this size. But the catch is the short period (8 seconds) – it’s wind swell, not groundswell, so it’ll be fat, lumpy, and sectiony. That size is too big for beginners, and the short period will make it dumpy. For the experts, it’s the best of a bad lot.
Another small glimmer is Thursday the 23rd afternoon. A 4ft E swell comes in with a much longer 12-second period, giving it better shape and energy (combined energy 407). The wind is light onshore, so it’s not clean, but that long period means the sets will be more powerful and organised. A longer period swell at a beach/jetty can break a bit straight, so don’t expect perfect barrels.
Overall, this is a pretty quiet run for Aha Rivermouth. The best you can hope for is a couple of sessions around the 25th if the wind stays light, but keep your expectations low. For a spot that’s usually “fairly consistent,” this is a rough patch.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Sat afternoon. Warm (max 29°C on Sat afternoon, min 28°C on Sat night). Winds decreasing (gales from the SE on Sat afternoon, moderate winds from the SSE by Mon afternoon). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Wed afternoon. Warm (max 30°C on Wed morning, min 27°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sat 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSE 15 | SSE 13 | S 12 | E 10 | E 10 | E 9 | E 9 | E 9 | ENE 9 | E 9 | E 9 | ENE 9 | E 10 | E 9 | E 9 | E 10 | E 10 | E 10 | E 10 | ENE 10 | E 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 8 | 7 | 15 | 15 | 16 | 17 | 15 | 26 | 27 | 30 | 14 | 26 | 30 | 29 | 29 | 29 | 31 | 18 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | glassy | glassy | cross | cross-on | cross | cross-on |
High Tide | 5:12PM1.66m | 4:05AM1.88m | 6:04PM1.77m | 5:02AM1.97m | 6:48PM1.86m | 5:53AM2.06m | 7:27PM1.93m | 6:40AM2.11m | 8:03PM1.97m | 7:26AM2.13m | 8:38PM1.98m | 8:10AM2.09m | 9:13PM1.97m | 8:54AM2.00m | |||||||
Low Tide | 10:19PM1.12m | 11:11AM0.23m | 11:20PM1.07m | 12:01PM0.11m | 00:10AM1.00m | 12:46PM0.04m | 00:56AM0.91m | 1:29PM0.03m | 1:38AM0.83m | 2:09PM0.07m | 2:20AM0.77m | 2:47PM0.17m | 3:02AM0.72m | ||||||||
 |  |  |  |  |  | | | | | | | | | | | | | |  | | |
 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 |
 | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | 7:21 |
mm | 10 | 3 | 5 | — | — | — | — | — | — | — | — | — | 1 | — | — | 2 | 1 | — | — | — | — |
Temp °C | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 30 | 29 | 28 | 29 | 29 | 29 | 28 | 29 | 28 | 28 |
Feels °C | 23 | 25 | 30 | 30 | 28 | 30 | 30 | 30 | 31 | 31 | 32 | 34 | 32 | 32 | 35 | 35 | 35 | 33 | 32 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | — | SSW 13 | W 10 | W 11 | W 10 | W 9 | WSW 10 | E 9 | ENE 9 | S 8 | S 8 | SSW 8 | SW 8 | SW 11 | SW 10 | S 7 | SW 10 | SW 10 | SW 9 | SW 9 | SW 9 |
| kJ | — | 1760 | 49 | 181 | 130 | 40 | 32 | 16 | 17 | 195 | 157 | 28 | 18 | 40 | 34 | 25 | 46 | 74 | 53 | 49 | 38 |
Swell 2 Height (m) Direction Period (s) | — | — | W 12 | W 11 | E 10 | W 11 | E 9 | W 8 | ESE 12 | E 9 | E 9 | ENE 9 | E 10 | E 9 | E 9 | SW 10 | E 10 | SSW 7 | E 10 | ENE 10 | ENE 8 |
| kJ | — | — | 3 | 83 | 7 | 22 | 15 | 11 | 14 | 15 | 26 | 27 | 30 | 14 | 26 | 34 | 29 | 16 | 29 | 31 | 14 |
Swell 3 Height (m) Direction Period (s) | — | — | — | E 10 | SE 13 | E 9 | SE 13 | SE 12 | W 7 | ESE 12 | SE 12 | ESE 11 | ESE 11 | ESE 9 | SE 11 | E 10 | SE 10 | E 10 | S 7 | W 7 | E 10 |
| kJ | — | — | — | 8 | 7 | 15 | 6 | 6 | 4 | 14 | 5 | 11 | 11 | 8 | 4 | 30 | 4 | 29 | 15 | 9 | 18 |
Wind waves Height (m) Direction Period (s) | SSE 15 | SSE 13 | S 12 | S 11 | SSE 10 | SSE 10 | S 9 | S 9 | S 8 | — | S 8 | SSW 8 | SSW 7 | SSW 8 | SSW 7 | — | S 7 | — | — | — | — |
| kJ | 30068 | 8436 | 3672 | 2017 | 998 | 681 | 484 | 356 | 234 | — | 117 | 96 | 91 | 81 | 61 | — | 25 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 687 | 595 | 683 | 683 | 627 | 605 | 761 | 605 | 605 | 627 | 70 | 17 | 17 | 17 | 596 | 17 | 17 | 90 | 75 | 68 | 68 |
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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