Surf Forecasts:
Aha Rivermouth surf forecast from 7 Jul 2026:
- Best quality surf: Friday 10 Jul, 12AM (local time) - 18ft (5.5m), 17s period, SE swell with cross-onshore winds.
- Most powerful swell: Friday 10 Jul, 6PM (local time) - 26ft (8.0m), 18s period, SE swell with 39,206 kJ wave energy.
- Next surfable swell (1★+): Friday 10 Jul, 12AM (local time) - 18ft (5.5m), 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 12AM. The primary swell is predicted to be 5.5m 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 8.0m 18s and forecast to arrive on Friday (Jul 10) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 9.5m 18s period and expected on Friday (Jul 10) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 10th Jul) | 18ft (5.5m) 17s |
| Best Surf | 12AM (Fri 10th Jul) | 18ft (5.5m) 17s |
| Most Powerful | 6PM (Fri 10th Jul) | 26ft (8.0m) 18s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Alright, let’s get real about Aha Rivermouth (Aha-Rivermouth) for the next couple weeks.
Right now, we’re looking at a pretty rough run. The first real chance of decent surf isn’t until the morning of Thursday, July 16th, and even that is a marginal call. From today through to the 15th, it’s mostly blown out, way too big for this break, or just flat. The swell coming in is huge—we’re talking 23ft to 26ft on July 10th (Friday) with an enormous energy (32,516-37,341)—but with strong cross-onshore winds near gale force, it’s a total washout. That’s kite-surfing territory, not paddling.
The water temperature is running a touch cooler than normal at 82°F, about 1°F cooler for this time of year, so it’s not far off average. The period on that big early swell is a very long, deep 16-18 seconds—proper groundswell—but that doesn’t matter when the wind is trashing it. For a beach/jetty setup, super-long-period swells like that often break too straight anyway, but this spot is exposed so it’s not the main issue.
After that, we go into a gap of several days with barely any rideable waves—tiny windswell or chop, cross-shore junk, and weak energy readings as low as 22. Nothing doing there.
Now, the standout. The morning of Monday, July 20th is the best on offer. We’ve got a solid 7ft swell from the east (E) with a long period of 17 seconds, and the wind is crossing slightly offshore from the southeast—that’s clean. Energy is moderate at 2,671. That’s the one to circle. It won’t be perfect, but it’s the cleanest we get in the whole outlook. Paddling out on that long period will be manageable with proper gaps between sets.
Tuesday morning, July 21st, sees more size—10ft from the east-northeast—but that’s getting too big for this break for most surfers, and the wind is onshore again, making it lumpy. That one’s only for experts, if anyone.
Overall, it’s a frustrating window. The only real highlight is the morning of July 20th. Everything else is either blown out, too huge, or too weak. We’ll just have to hope the pattern shifts. For now, keep the board waxed for that Monday.
Rusty
Short Range ForecastHeavy rain (total 25mm), heaviest during Fri night. Warm (max 29°C on Wed night, min 27°C on Wed morning). Winds increasing (light winds from the ENE on Wed morning, gales from the SE by Fri night). | Days 4-6 Weather SummaryHeavy rain (total 67mm), heaviest during Sun night. Warm (max 29°C on Sat morning, min 27°C on Sun afternoon). Winds decreasing (gales from the SE on Sat morning, light winds from the E by Mon night). | ||||||||||||||||||||
Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
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) | ESE 16 | ESE 16 | ESE 16 | ESE 16 | SE 16 | SE 17 | SE 18 | SE 18 | SSE 17 | SSW 17 | SE 13 | SSE 12 | SSE 11 | SSE 11 | SSE 10 | E 9 | ESE 6 | E 5 | ESE 13 | ESE 13 | ESE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2475 | 2968 | 5002 | 7354 | 10595 | 19032 | 32516 | 37341 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 101 | 56 | 102 | 235 | 254 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-off | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 12:38PM1.50m | 00:47AM1.73m | 2:24PM1.47m | 1:52AM1.75m | 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 | ||||||||
Low Tide | 6:25PM0.92m | 7:49AM0.67m | 7:40PM1.05m | 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 | ||||||||
 | |  |  | |  | | | | | | | | | | | | |  | | | |
 | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — |
 | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — |
mm | — | — | — | 2 | 1 | 3 | 1 | 5 | 13 | 3 | 2 | 6 | 4 | 8 | 38 | 3 | 2 | 1 | — | — | — |
Temp °C | 28 | 28 | 29 | 29 | 29 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 28 |
Feels °C | 30 | 29 | 30 | 29 | 29 | 28 | 23 | 22 | 23 | 22 | 24 | 26 | 29 | 28 | 29 | 31 | 31 | 31 | 30 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 16 | ESE 16 | ESE 16 | ESE 16 | SE 16 | SE 17 | SSE 18 | — | — | SSW 17 | SSW 16 | SW 15 | SW 13 | WSW 12 | SSE 10 | WSW 9 | SSE 9 | S 9 | S 9 | S 9 | ESE 12 |
| kJ | 2475 | 2968 | 5002 | 7354 | 10595 | 19032 | 48464 | — | — | 27593 | 5100 | 2120 | 651 | 193 | 855 | 17 | 528 | 196 | 159 | 117 | 254 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 11 | E 9 | E 9 | E 9 | ESE 13 | ESE 13 | S 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 57 | 15 | 15 | 15 | 102 | 235 | 89 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 11 | SE 13 | SW 10 | SW 10 | E 9 | ENE 9 | SW 11 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 23 | 7 | 14 | 15 | 15 | 17 | 20 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | SE 18 | SE 18 | SSE 17 | SSE 16 | SE 13 | SSE 12 | SSE 11 | SSE 11 | — | SSE 10 | ESE 6 | E 5 | E 6 | E 6 | E 6 |
| kJ | — | — | — | — | — | — | 32516 | 37341 | 39016 | 26142 | 7393 | 4166 | 2241 | 1699 | — | 638 | 101 | 56 | 41 | 39 | 69 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 68 | 68 | 68 | 710 | 931 | 595 | 693 | 955 | 693 | 693 | 693 | 683 | 595 | 595 | 595 | 595 | 70 | 70 | 70 | 70 | 70 |
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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