
Surf Forecasts:
Aha Rivermouth surf forecast from 10 Jul 2026:
- Best quality surf: Friday 10 Jul, 3PM (local time) - 23ft (7.0m), 17s period, SE swell with cross-onshore winds.
- Most powerful swell: Saturday 11 Jul, 12AM (local time) - 30ft (9.0m), 17s period, SE swell with 46,399 kJ wave energy.
- Next surfable swell (1★+): Friday 10 Jul, 3PM (local time) - 23ft (7.0m), 17s period with SE 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 (Jul 10) at 3PM. The primary swell is predicted to be 7.0m and 17s period. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 9.0m 17s and forecast to arrive on Saturday (Jul 11) 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 9.5m 17s period and expected on Saturday (Jul 11) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Fri 10th Jul) | 23ft (7.0m) 17s |
| Best Surf | 3PM (Fri 10th Jul) | 23ft (7.0m) 17s |
| Most Powerful | 12AM (Sat 11th Jul) | 30ft (9.0m) 17s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Alright folks, Rusty here. Let's get into it. We've got one main spot on the radar for this stretch, Aha Rivermouth, and honestly, it's a bit of a rough patch ahead.
Starting with the overall pattern: The next couple of weeks look tricky. The first few days are a total write-off, and then we get a massive pulse of energy that's way too big and messy. There's a period of clean, tiny surf in the middle, but it's not really rideable. The best we can hope for is a window of manageable size right at the end, but it's a long way off.
Friday 10th July is a no-go. We're looking at a massive 20ft to 23ft swell from the SE, with a very long period of 17 seconds. That's a huge amount of energy (22646 to 31178) and the wind is a near gale from the east. It's blown out and way too big for the break. This is expert-only or maybe even kite-surfing territory if that's your thing.
Saturday 11th and Sunday 12th July are completely flat with zero energy. Severe gale winds on Saturday clean up a bit by Sunday, but there's no swell to work with. The same goes for the whole week from Monday 13th through Thursday 17th July. The swell is tiny, dropping to 1.0ft to 1ft with weak energy (8 to 40). The wind does go light and cross-off, making the water clean, but it's just not enough to surf. The water temp is sitting around 83°, which is about average for this time of year.
The first real chance of a wave comes Saturday 18th July, but it's a wild one. The swell jumps to 10ft to 15ft from the ESE, with a short, choppy period of 8 to 9 seconds. The energy is strong (1137 to 3326), but the wind is a strong breeze to near gale, blowing cross-onshore. It's a lumpy, blown-out mess. Again, this is for experts only, and honestly, it looks more like a kite-surfing setup than a paddle surfing one.
Sunday 19th to Tuesday 21st July continues the trend of big, messy swell. The swell hangs around 7ft to 10ft from the SE and ESE, with short periods. The wind is still fresh and cross-onshore, keeping it lumpy and uninviting. The energy is moderate to strong (422 to 1553), but the quality just isn't there.
The best window, and it's a long shot, is from Wednesday 22nd July onwards. The swell starts to drop. By Wednesday 22nd, it's 4ft to 4ft from the E with a period of 8 seconds and moderate energy (171 to 206). The wind is onshore or cross-onshore, so it's still not great. But by Thursday 23rd and Friday 24th July, the swell settles to 3ft to 3ft from the ENE, with a period of 10 seconds. The wind goes light and onshore, which will clean things up. This is the standout period, but it's over a week away. The energy is weak to moderate (143 to 224), but it's the most manageable and cleanest window on offer.
Saturday 25th July the swell is back down to 2ft with weak energy (88 to 89), so that window might be short.
The standout: If you're looking for the best bet, it's the Thursday 23rd and Friday 24th of July. The swell is a manageable size, the period is decent, and the wind looks light. It's not a classic, but it's the only window that looks like it might offer a few clean, rideable waves. Keep in mind, this is a point or river-mouth style break (Aha Rivermouth), so that longer period swell from the ENE should set up nicely, but it's a long way out, so don't set your watch by it.
Rusty.
Short Range ForecastHeavy rain (total 32mm), heaviest during Fri afternoon. Warm (max 29°C on Fri night, min 28°C on Fri morning). Winds decreasing (severe gales from the ESE on Fri night, moderate winds from the SSE by Sun night). | Days 4-6 Weather SummarySome drizzle, heaviest during Wed night. Warm (max 29°C on Mon morning, min 28°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | |||||||||||||||
AM | 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) | SE 17 | SE 17 | SE 17 | SSE 17 | SSE 15 | SSE 13 | SSE 12 | E 10 | SE 13 | E 9 | E 9 | E 9 | ENE 9 | E 9 | E 9 | ENE 9 | ENE 10 | E 9 | E 9 | E 10 | ENE 9 |
Wave Graph | |||||||||||||||||||||
22646 | 31178 | 46399 | 0 | 0 | 0 | 0 | 8 | 7 | 15 | 15 | 15 | 17 | 15 | 26 | 16 | 31 | 25 | 27 | 30 | 29 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | on | cross-on | cross-on |
High Tide | 4:01PM1.54m | 3:01AM1.80m | 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 | ||||||||
Low Tide | 9:07AM0.54m | 9:04PM1.12m | 10:14AM0.38m | 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 | |||||||
5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | |
— | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | |
mm | 4 | 5 | 9 | 6 | 4 | — | 2 | 1 | 1 | — | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 28 | 29 | 28 |
Feels °C | 25 | 23 | 20 | 21 | 25 | 25 | 29 | 30 | 30 | 31 | 31 | 32 | 32 | 32 | 33 | 34 | 34 | 34 | 33 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 17 | SSE 17 | — | — | — | SSW 13 | SW 14 | W 12 | W 11 | W 11 | W 10 | S 9 | ENE 9 | S 8 | E 9 | S 8 | S 7 | S 7 | S 7 | S 7 | ENE 9 |
22646 | 45669 | — | — | — | 2265 | 736 | 365 | 188 | 112 | 48 | 356 | 17 | 187 | 26 | 72 | 70 | 50 | 54 | 39 | 29 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | WSW 13 | SW 12 | SW 11 | SW 10 | E 9 | WSW 8 | W 8 | E 9 | SSW 8 | ENE 9 | ENE 10 | E 9 | E 9 | E 10 | SW 8 |
— | — | — | — | — | — | 273 | 346 | 126 | 25 | 15 | 23 | 10 | 15 | 14 | 16 | 31 | 25 | 27 | 30 | 11 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | E 10 | SE 13 | E 9 | WSW 10 | E 9 | SW 10 | W 7 | SW 8 | ESE 11 | SW 10 | SSW 8 | SW 10 | SW 10 | ESE 10 |
— | — | — | — | — | — | — | 8 | 7 | 15 | 10 | 15 | 15 | 9 | 11 | 11 | 15 | 14 | 15 | 15 | 10 | |
Wind waves Height (m) Direction Period (s) | — | SE 17 | SE 17 | SSE 17 | SSE 15 | SSE 13 | SSE 12 | SSE 11 | SSE 10 | SSE 10 | SSE 9 | — | S 8 | SSE 8 | S 7 | — | — | — | — | — | SSE 7 |
— | 31178 | 46399 | 45519 | 25464 | 7782 | 2845 | 1782 | 932 | 640 | 506 | — | 230 | 143 | 88 | — | — | — | — | — | 36 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 693 | 931 | 690 | 693 | 935 | 595 | 595 | 683 | 595 | 12 | 60 | 605 | 70 | 70 | 17 | 17 | 68 | 17 | 68 | 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.










