Aha Rivermouth Surf Break

Lat Long: 26.72° N 128.30° E

Aha Rivermouth Surf Forecast and Surf Report

Issued: 8 am 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Aha Rivermouth sea temperature is
28.4° C
0.4° 

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 17 Aug 2026:

  • Best quality surf: Friday 21 Aug, 12PM (local time) - 10ft (3.0m), 9s period, SE swell with cross-shore winds.
  • Most powerful swell: Thursday 20 Aug, 6PM (local time) - 10ft (3.0m), 10s period, SE swell with 1,730 kJ wave energy.
  • Next surfable swell (1★+): Friday 21 Aug, 12PM (local time) - 10ft (3.0m), 9s 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 (Aug 21) at 12PM. The primary swell is predicted to be 3.0m and 9s period. The wind is predicted to be cross-shore as the swell arrives.

The most powerful waves expected at Aha Rivermouth in the next 16 days are 3.0m 10s and forecast to arrive on Thursday (Aug 20) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 8s period and expected on Saturday (Aug 22) at 6PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12PM (Fri 21st Aug)10ft (3.0m) 9s
Best Surf12PM (Fri 21st Aug)10ft (3.0m) 9s
Most Powerful 6PM (Thu 20th Aug)10ft (3.0m) 10s

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


The Lowdown

Alright folks, it's Rusty here. Let’s have a good hard look at what’s on the table for Aha Rivermouth over the next couple of weeks.

Right off the bat, I gotta be straight with you – this is a rough run. We’ve got a gap of almost a full week before you'd even consider paddling out. The first part is all about waiting it out. From now until Wednesday the 20th of August, it’s pretty grim. We’ve got weak, short-period swell from the east, and consistent cross-onshore winds ruining any chance of clean waves. The water is sitting at a warm 83°F, which is about average for this time of year, but that’s the only nice thing I can say. The wave energy is weak to moderate at best (115 to 463), just not worth the effort. The swell builds on Wednesday the 19th, but the wind is a fresh cross-onshore, so it's lumpy and messy – I'd give it a miss.

Thursday the 20th of August afternoon is where things get interesting, but only for the brave. The swell jumps to 10 ft from the southeast, and the combined energy is very strong (1538). The wind finally switches to a clean offshore, which would normally be heaven, but here’s the catch: the swell is too big for this break. This is expert-only territory, and even then, it might be a washing machine. It’s a beach and jetty setup, and with that size and energy, this is looking more like a kite surfer’s paradise than a paddle session.

After that brief spike, it drops like a stone. Friday the 21st through to Sunday the 23rd of August is tiny – just 0.7 ft to 4 ft of weak swell. The wind is offshore, so it’s clean, but there’s simply no power. The wave energy is between 9 and 102, which is pathetic. Not worth getting wet.

Now, Monday the 24th of August – this is our one true standout. We get a beautiful, clean setup. A 4 ft to 6 ft east swell with a very long period of 16 seconds. This is proper groundswell. The wind is light offshore and almost glassy, so the surface will be like a mirror. The combined energy is huge (910 to 1646). This is the best on offer without a doubt. That said, this kind of long-period swell can be tricky – it might break too straight at a beachy spot like this. It’ll be better for the more experienced surfers who can read the sets. Crowds are possible here sometimes, so get in early.

Tuesday the 25th of August is another size jump, but again, it’s too big. 12 ft to 13 ft from the east with ridiculous energy (6474 to 8169). The period is still long at 16-17 seconds. The wind is light cross-shore, but you’d need a death wish to paddle out in that. This is purely for the experts, if anyone.

From Wednesday the 26th of August onwards, it’s a complete mess. The swell stays massive, but the winds turn nasty – strong cross-onshore, gale-force, and even storm-force by the end of the month. We’re talking 13 ft to 18 ft waves with 40-95 km/h winds. By Friday the 28th, it’s a full-on storm with 53 mph gusts. Don’t even think about it. The energy is up there (10060 at one point), but it’s a dangerous, blown-out ocean. This is not surfable for anyone.

So, to sum it up for Aha Rivermouth: we’ve got one golden window – Monday the 24th of August. That’s your day. Everything before is a write-off, and everything after is a stormy monster. Keep your eyes on that date.

Rusty.

Short Range Forecast

Heavy rain (total 29mm), heaviest during Wed night. Warm (max 28°C on Mon morning, min 27°C on Mon night). Winds increasing (light winds from the ESE on Mon morning, strong winds from the SE by Wed night).

Days 4-6 Weather Summary

Heavy rain (total 57mm), heaviest during Thu afternoon. Warm (max 28°C on Thu morning, min 26°C on Thu night). Winds decreasing (strong winds from the SE on Thu afternoon, moderate winds from the SE by Fri night).

Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
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
0
0
0
0
0
1
1
!
0
0
1
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)
0.7
ENE
10
0.6
ENE
10
1.1
E
6
1.1
E
6
1.3
E
6
1.7
E
7
1.9
E
7
1.9
ESE
8
2.5
ESE
8
2.5
SE
8
3
SE
10
2.5
SE
9
2.5
SE
8
3
SE
9
0.2
ENE
9
0.2
E
9
2.5
SE
8
0.2
ENE
9
0.2
E
14
0.2
E
14
0.3
ENE
10
Wave Graph
Metric surfscale
Energy kJ
104
77
77
80
108
262
397
427
809
981
1563
1154
987
1592
8
7
906
7
15
15
19
Wind (km/h)
15
ESE
25
ESE
30
ESE
25
E
30
ENE
35
E
40
E
35
ESE
45
SE
30
SE
40
SE
35
SSE
20
SE
25
SSE
25
ESE
25
SSE
25
SSE
30
SSE
25
SSE
20
SE
20
ESE
Wind State
cross-on
cross-on
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross-off
cross
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross
cross
High Tide
9:16AM1.92m
9:31PM1.98m
9:55AM1.76m
9:58PM1.91m
10:38AM1.58m
10:27PM1.82m
11:35AM1.41m
10:59PM1.71m
1:42PM1.30m
11:43PM1.60m
5:29PM1.41m
1:28AM1.52m
5:43PM1.53m
Low Tide
3:20PM0.59m
3:52AM0.57m
3:47PM0.76m
4:34AM0.65m
4:13PM0.94m
5:24AM0.74m
4:36PM1.10m
6:35AM0.81m
4:55PM1.26m
8:22AM0.83m
7:56PM1.39m
9:56AM0.75m
10:37PM1.33m
clear
thunderstorm
thunderstorm
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
rain showers
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
5:58
6:00
6:00
6:00
6:01
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:01
7:00
7:00
6:59
6:59
6:58
6:57
 mm
1
2
4
5
5
12
6
18
5
1
8
8
4
3
4
Temp °C
28
28
27
28
28
28
28
28
28
28
27
27
27
27
28
28
28
27
28
28
28
Feels °C
31
30
27
28
29
29
27
28
28
29
26
26
29
28
31
30
29
28
30
30
30
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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