Aha Rivermouth Surf Break

Lat Long: 26.72° N 128.30° E

Aha Rivermouth Surf Forecast and Surf Report

Issued: 2 am 18 Aug 2026 (local time)

Forecast update in  hr  min

Today's Aha Rivermouth sea temperature is
28.6° C
0.1° 

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:

  • Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 8ft (2.5m), 17s period, E swell with 4,423 kJ wave energy.

Best Forecast Surf Conditions for Aha Rivermouth this week:

The most powerful waves expected at Aha Rivermouth in the next 16 days are 2.5m 17s and forecast to arrive on Tuesday (Aug 25) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 8s period and expected on Friday (Aug 21) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 9AM (Tue 25th Aug)8ft (2.5m) 17s

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


The Lowdown

Alright folks, Rusty here. Let’s take a look at this stretch of coast. The forecast is a bit of a mixed bag—we’ve got a solid run of waves coming up, but the wind is going to be a problem for a lot of it. The standout period is looking like a mid-sized groundswell that arrives late in the first week, but it brings some serious size with it.

The early part of the week is a write-off, I’m sorry to say. For the first few days, from Tuesday through Thursday, we’ve got a fresh cross-onshore breeze blowing at 18 to 22 mph, and the swell is small and weak. The combined energy is only around 161 to 488 (moderate at best), and the waves are lumpy and messy. Definitely not worth paddling out for.

The wind eases up a bit on Friday, turning cross-offshore, but the swell drops right off to a tiny 0.7 ft to 2 ft, so it’s clean but flat. The weekend is much the same—tiny swell and a cross-shore wind, barely any energy.

Then we get to the real deal. Starting Monday, 24 August, a solid, long-period swell shows up. That ESE swell is 4 ft with a 16-second period. The combined energy jumps to 894 (moderate), and the wind is a moderate cross-on, so the surf will be choppy. It’s not perfect, but it’s a step up. By Tuesday, 25 August, that swell pushes to 8 ft, with a 17-second period, and the energy is 4552 (strong). The wind goes onshore from the NE at 12 mph, but it's clean. However, at 8 ft, we’re only talking about experienced surfers here.

The real monster is Thursday, 27 August. Huge, groundswell from the ENE at 26 ft with a 15-second period. The energy is 47860 (very strong). The wind is a moderate cross-shore. This is not for the faint of heart—this is big, powerful, and only for experts. The same goes for Friday, 28 August, with a 30 ft swell from the ESE, though the wind is clean cross-off at 18 mph. The break is too big for itself, honestly. We’re talking about a setup that looks more interesting for kite surfing than paddle surfing.

After that, it drops off a cliff. The weekend of 29-30 August is back to tiny, weak, and messy, with a cross-shore wind. The last few days of August and into September are poor, with no real swell.

So, the best bet? If you’re an expert, the last week of August is where it’s at. The Aha Rivermouth (beach/jetty) on Thursday, 27 August, is the standout. The swell is 26 ft from the ENE, with a 15-second period, and the wind is a moderate cross-shore. The energy is very strong at 47860. The crowd is rated as "sometimes", so it could get busy if people are brave enough. This is a true, big-wave session. The water temperature is 84°, which is about average for this time of year.

For a more manageable option, Monday, 24 August, is your best bet. The ESE swell is 4 ft with a 16-second period, and the energy is 894. The wind is a moderate cross-on, so it’s a bit choppy, but it’s the only window where the size is more forgiving for intermediates.

All in all, get ready for a big, powerful groundswell at the end of the month. The rest of the time, it’s either flat or blown out.

Rusty.

Short Range Forecast

Heavy rain (total 34mm), heaviest during Thu night. Warm (max 28°C on Tue afternoon, min 26°C on Thu night). Mainly strong winds.

Days 4-6 Weather Summary

Heavy rain (total 23mm), heaviest during Fri morning. Warm (max 28°C on Sat morning, min 26°C on Fri morning). Mainly strong winds.

Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
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
0
0
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)
1.1
ESE
6
1.3
E
6
1.4
E
6
1.6
E
7
1.6
E
7
1.9
ESE
7
2
ESE
8
2.1
SE
8
0.2
ESE
11
0.2
ESE
11
0.7
E
6
0.6
E
6
0.3
ENE
9
0.3
ENE
9
0.3
SE
10
0.3
SE
10
0.3
ESE
14
0.5
E
17
1.2
ESE
16
1.8
ESE
17
2.1
E
17
Wave Graph
Metric surfscale
Energy kJ
89
123
153
232
236
375
488
481
11
11
33
23
15
15
16
16
41
153
807
1972
2713
Wind (km/h)
30
E
30
E
30
E
35
E
35
ESE
35
ESE
35
SE
45
SE
40
SE
35
SSE
35
SSE
40
ESE
35
SE
35
SE
30
SE
30
ESE
30
ESE
30
ESE
25
E
25
E
20
ENE
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross-off
cross-off
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
High Tide
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
3:31AM1.54m
6:01PM1.65m
Low Tide
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
10:52AM0.63m
11:23PM1.21m
part cloud
clear
rain showers
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
6:00
6:00
6:00
6:01
6:01
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:00
7:00
6:59
6:59
6:58
6:57
6:55
 mm
1
3
6
8
2
2
12
11
5
5
1
1
Temp °C
27
28
28
28
28
28
27
27
27
26
27
27
28
28
27
28
28
27
27
27
27
Feels °C
27
29
29
29
28
29
27
25
26
25
27
28
28
28
28
29
29
29
27
27
28
  • 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
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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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