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Surf Forecasts:
Aha Rivermouth surfForecast / Okinawa / Japan
16 Day Weather and Surf, issued 8 am Wednesday 13 May 2026 JSTForecast update in hr min s Forecast update imminent
Aha Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Aha Rivermouth sea temperature is
23.7° C
(Which is 1.3°C colder than average for this time of year)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 Wednesday (May 20) at 12PM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.2m and 4s. 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 1.5m 9s and forecast to arrive on Monday (May 18) at 6AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 8s period and expected on Wednesday (May 13) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Wed 20th May) | 3.5ft (1.0m) 10s |
| Best Surf | 12PM (Wed 20th May) | 3.5ft (1.0m) 10s |
| Most Powerful | 6AM (Mon 18th May) | 5ft (1.5m) 9s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 23°C on Wed morning, min 22°C on Wed morning). Winds increasing (light winds from the NE on Wed morning, fresh winds from the ENE by Fri morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Sat morning, min 22°C on Sat morning). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 13 | Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | Tuesday 19 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
E 10 | E 10 | ESE 10 | ESE 10 | E 9 | ESE 9 | E 5 | ENE 6 | E 7 | E 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | NE 8 | E 9 | ENE 9 | E 9 | E 9 | E 8 | ESE 9 | |
117 | 220 | 98 | 123 | 113 | 64 | 56 | 131 | 202 | 150 | 134 | 217 | 306 | 361 | 256 | 332 | 289 | 162 | 150 | 115 | 73 | |
Wind (km/h) | |||||||||||||||||||||
on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | |
High Tide | 4:32PM1.61m | 4:33AM1.75m | 5:22PM1.74m | 5:08AM1.85m | 6:07PM1.83m | 5:42AM1.93m | 6:51PM1.87m | 6:18AM1.99m | 7:35PM1.87m | 6:55AM2.01m | 8:20PM1.83m | 7:34AM1.98m | 9:07PM1.77m | ||||||||
Low Tide | 10:18AM0.51m | 10:26PM0.60m | 10:59AM0.30m | 11:10PM0.61m | 11:38AM0.11m | 11:50PM0.63m | 12:19PM-0.03m | 00:30AM0.67m | 12:59PM-0.11m | 1:09AM0.73m | 1:42PM-0.12m | 1:49AM0.79m | 2:26PM-0.07m | 2:33AM0.86m | |||||||
 | |  |  | | |  | |  | | | | | | | | | | | | | |
 | 5:41 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — |
 | — | 7:05 | — | — | 7:06 | — | — | 7:06 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 23 | 23 | 22 | 23 | 23 | 23 | 22 | 22 | 22 | 23 | 23 | 22 | 23 | 23 | 22 | 23 | 23 | 22 | 24 | 24 | 23 |
25 | 25 | 23 | 23 | 23 | 22 | 19 | 18 | 18 | 20 | 20 | 19 | 20 | 21 | 21 | 22 | 22 | 21 | 23 | 24 | 24 | |
Swell 1 Height (m) Direction Period (s) | E 10 | E 10 | ESE 10 | ESE 10 | E 9 | ESE 9 | E 9 | ESE 10 | ESE 10 | ENE 9 | ESE 8 | ESE 10 | ESE 13 | ESE 13 | E 9 | E 9 | ENE 9 | E 9 | E 9 | E 8 | E 8 |
 kJ | 117 | 220 | 98 | 123 | 113 | 64 | 43 | 51 | 35 | 28 | 36 | 20 | 17 | 16 | 211 | 332 | 289 | 162 | 150 | 115 | 68 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | SSE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 11 | SE 12 | SE 11 | ESE 10 | ESE 10 | ENE 10 | SE 10 | SE 10 | ESE 12 | N 6 | SE 12 | N 6 | N 6 | N 6 | ESE 9 |
| kJ | 100 | 11 | 61 | 46 | 17 | 29 | 23 | 5 | 5 | 33 | 33 | 19 | 4 | 4 | 15 | 28 | 22 | 38 | 18 | 11 | 73 |
Swell 3 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 7 | SSE 7 | S 6 | S 6 | S 6 | ESE 11 | SE 11 | SE 14 | SE 10 | SE 10 | — | ESE 12 | — | ESE 12 | SE 11 | SE 11 | N 5 |
| kJ | 13 | 11 | 11 | 5 | 5 | 4 | 3 | 1 | 1 | 11 | 5 | 7 | 4 | 4 | — | 14 | — | 13 | 5 | 5 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | — | ESE 3 | E 3 | E 3 | E 5 | ENE 6 | E 7 | E 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | NE 8 | — | N 6 | — | — | — | — |
| kJ | — | — | — | 1 | 2 | 6 | 56 | 131 | 202 | 150 | 134 | 217 | 306 | 361 | 256 | — | 18 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 596 | 621 | 12 | 44 | 44 | 595 | 70 | 68 | 70 | 40 | 595 | 40 | 40 | 40 | 40 | 60 | 66 | 66 | 12 | 12 | 12 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Aha Rivermouth surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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