Aha Rivermouth Surf Break

Lat Long: 26.72° N 128.30° E

Aha Rivermouth Surf Forecast and Surf Report

Issued: 8 am 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Aha Rivermouth sea temperature is
28.1°C
0.5° 

Aha Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Aha Rivermouth surf forecast from 1 Sep 2026:

  • Best quality surf: Friday 4 Sep, 3AM (local time) - 3.5ft (1.0m), 10s period, E swell with cross-offshore winds.
  • Most powerful swell: Thursday 3 Sep, 3AM (local time) - 10ft (3.0m), 11s period, E swell with 1,763 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 3AM (local time) - 3.5ft (1.0m), 10s period with E 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 (Sep 04) at 3AM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 1.1m and 8s. 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 3.0m 11s and forecast to arrive on Thursday (Sep 03) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 9s period and expected on Friday (Sep 04) at 6PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Fri 4th Sep)3.5ft (1.0m) 10s
Best Surf 3AM (Fri 4th Sep)3.5ft (1.0m) 10s
Most Powerful 3AM (Thu 3rd Sep)10ft (3.0m) 11s

Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.


The Lowdown

Alright folks, Rusty here with a look at what Aha Rivermouth's got coming our way. Buckle up, because it's a bit of a mixed bag, and honestly, a lot of it is gonna be a write-off for the paddle crew.

The whole 16-day window is dominated by a single break, Aha Rivermouth. It's a beach and jetty setup exposed to the swell, but it's generally only for the intermediate surfer and above, and it's not the most consistent spot.

Looking at the whole picture, the water's sitting at a toasty 83°, which is pretty much average for this time of year, so no need for a thick wetsuit.

Right from the get-go, Tuesday brings a chunky 8ft of ESE swell, but with a 25 mph cross-on wind, it's gonna be a messy, blown-out disaster. That theme carries through Wednesday with similar conditions. The combined energy readings are high – over 800, even hitting 1155 – but it's all junk. Honestly, with that wind and size, it's looking more like a kitesurfing session than anything for a surfboard.

Thursday the 3rd shows a little flicker of hope. The morning is still cross-shore and messy with an 8ft swell and a solid 1405 energy reading, but by the afternoon, it cleans up. We get a 6ft wave from the east with a clean, cross-offshore breeze from the WNW. This is about as good as it gets this week, with manageable size and clean conditions.

Friday the 4th drops right off. We're looking at tiny 3ft to 3ft waves with clean conditions, but barely any energy (138 to 223). It's surfable, but you'll be scratching for anything with a pulse. The rest of the first week into the second is a long, bleak stretch of tiny surf, onshore winds, and poor conditions. There's a solid 10-day gap where there's really nothing worth paddling out for.

Now, let's talk about the third week. There's a huge pulse of energy forecast for the 15th of September. The Tuesday morning shows a 6ft east swell with a very long 12-second period and big combined energy of 1514, but it's cross-on and choppy. Then Tuesday afternoon really fires up with a 7ft east swell and a massive 15-second period from the east, pumping out a 2359 energy reading. The wind is cross-on though, so it's not perfect.

The real standout is Wednesday the 16th of September. We've got a massive 15ft swell from the ENE with a 9-second period in the morning, and the energy reading is off the charts at 2890. The wind is light and offshore from the NNE. This is big, powerful surf, and with a clean wind, it would be a dream for an expert. But here's the thing – even the data says it's too big for this break. It's a long-range call, so it's promising but not certain. The late Wednesday call is even more massive, with a 31ft swell and a 13-second period, and an incredible 30994 energy reading. Again, too big for the break. If you're an expert charging big waves, this is the one window to watch, but everyone else should stay well clear.

So, the best on offer? It's a toss-up between the clean Thursday afternoon on the 3rd for some fun-sized waves, and that massive, expert-only swell on the 16th. If you're a beginner, this whole forecast is a no-go. Take the low-quality days to rest up and wait for a better window.

Rusty.

Short Range Forecast

Heavy rain (total 22mm), heaviest during Thu morning. Warm (max 28°C on Tue morning, min 26°C on Wed night). Winds decreasing (strong winds from the E on Tue night, light winds from the WNW by Thu night).

Days 4-6 Weather Summary

Heavy rain (total 21mm), heaviest during Sat night. Warm (max 28°C on Fri morning, min 27°C on Fri night). Mainly fresh winds.

Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
2
2
1
2
1
0
1
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.5
ESE
9
2.5
E
9
2.5
E
9
2.2
E
9
2.3
E
8
3
E
10
2.5
E
10
1.9
E
10
1.1
E
10
0.8
E
10
0.9
N
7
0.5
E
9
1.2
N
9
1.2
N
10
1.1
N
9
0.8
N
9
0.7
N
9
0.6
N
8
0.5
E
8
0.5
E
8
0.4
E
8
Wave Graph
Metric surfscale
Energy kJ
933
1138
1189
749
733
1665
1405
725
225
116
85
38
241
273
207
99
74
46
35
33
23
Wind (km/h)
40
ENE
40
E
40
E
30
E
30
ENE
30
NNE
20
NW
25
WNW
15
W
10
W
10
WNW
10
NW
10
ENE
25
E
25
E
25
NE
20
NNE
10
NNE
15
NE
15
ENE
20
NE
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross-off
cross-off
cross-off
cross-off
cross
on
cross-on
cross-on
on
on
on
on
cross-on
on
High Tide
9:03PM2.00m
9:45AM1.84m
9:34PM1.95m
10:38AM1.67m
10:11PM1.87m
11:54AM1.50m
10:59PM1.76m
2:11PM1.44m
00:22AM1.66m
4:12PM1.54m
2:30AM1.65m
5:03PM1.68m
Low Tide
2:59PM0.63m
3:28AM0.42m
3:32PM0.79m
4:15AM0.47m
4:07PM0.97m
5:15AM0.55m
4:54PM1.15m
6:40AM0.62m
6:28PM1.30m
8:28AM0.61m
9:01PM1.29m
9:55AM0.51m
10:26PM1.13m
thunderstorm
thunderstorm
thunderstorm
clear
clear
light rain
thunderstorm
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
cloud
clear
thunderstorm
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:07
6:07
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:46
6:45
6:45
6:44
6:43
6:42
6:40
 mm
1
3
4
3
6
4
1
1
2
1
2
5
8
2
2
Temp °C
28
28
27
28
28
27
27
27
27
28
28
28
28
28
27
27
27
27
28
28
28
Feels °C
27
27
25
28
28
26
29
29
30
33
32
33
33
30
27
28
28
30
31
31
32
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
How to use the Wavefinder 
submit an eyeball surf report

Quick surf report for Aha Rivermouth:

join our community of surf reporters

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.

Nearest locationNearest