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Surf Forecasts:

Aha Rivermouth surfForecast / Okinawa / Japan

information circle12 Day Weather and Surf, issued 8 pm Monday 15 Sep 2025 JST
Forecast 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
29.9° C
 (Which is 1.6°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Aha Rivermouth this week:

The surf forecast for Aha Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 22) at 9PM. The primary swell is predicted to be 6.0m and 15s period with a secondary swell of 3.0m and 8s. The wind is predicted to be cross-onshore as the swell arrives.

The most powerful waves expected at Aha Rivermouth in the next 12 days are 8.0m 15s and forecast to arrive on Tuesday (Sep 23) 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 0.4m 7s period and expected on Friday (Sep 19) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Mon 22nd Sep)20ft (6.0m) 15s
Best Surf 9PM (Mon 22nd Sep)20ft (6.0m) 15s
Most Powerful 3AM (Tue 23rd Sep)26ft (8.0m) 15s

Table - best surf conditions forecast for Aha Rivermouth over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
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Short Range Forecast Light rain (total 2mm), mostly falling on Tue night. Warm (max 29°C on Mon night, min 28°C on Mon night). Wind will be generally light.

Days 3-6 Weather Summary Some drizzle, heaviest during Sun afternoon. Warm (max 29°C on Thu night, min 28°C on Thu night). Winds increasing (light winds from the E on Fri morning, fresh winds from the NE by Sun afternoon).

Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Mon
22
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
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
See all maps
Wave Height (m) & direction (?)
0.6
ESE
0.6
SE
0.6
SE
0.6
SE
0.4
ESE
0.4
ESE
0.4
E
0.4
E
0.6
ESE
0.5
E
0.5
E
0.5
E
0.6
ESE
0.5
ESE
0.4
ESE
0.8
NE
1.5
ESE
3
E
3.5
E
4
ESE
4.5
E
Period(s) (?)887710999799999941313141414
Wave
Graph
(?)Metric surfscale
Energy (?)586757777269677262517881869063579132910412966298660
Wind
(km/h)
15
ESE
15
ESE
15
E
15
SE
15
SE
10
SE
15
ESE
15
ESE
15
E
15
E
10
E
15
E
15
E
15
ENE
20
NNE
25
NE
30
NNE
35
NE
30
NE
40
NE
50
ENE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on		cross-
on		crosscrosscrosscrosscrosscross-
on		cross-
on		cross-
on		cross-
on		cross-
on		onononononononon
High Tide
/ height (m)
11:53PM
1.62
4:00PM
1.52
2:08AM
1.57
4:54PM
1.64
3:50AM
1.66
5:29PM
1.75
4:53AM
1.78
5:57PM
1.84
5:39AM
1.88
6:22PM
1.91
6:17AM
1.95
6:45PM
1.96
6:51AM
1.98
Low Tide
/ height (m)
8:04AM
0.63
8:53PM
1.30
9:39AM
0.57
10:23PM
1.15
10:42AM
0.49
11:11PM
0.97
11:27AM
0.42
11:48PM
0.79
12:03PM
0.40
12:19AM
0.65
12:33PM
0.42
12:48AM
0.53
1:00PM
0.46
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Mon
22
Sunrise-6:11--6:11--6:13--6:13--6:13--6:13--6:13-
Sunset--6:30--6:30--6:28--6:27--6:25--6:24--6:23
clear
part cloud
clear
thunderstorm
cloud
part cloud
thunderstorm
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
Rain (mm)
---1--1----------1421
Temp. °C292929292929282929292829282828282828282928
Feels °C (?)333132323233313231313232313029292827282825
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Eyeball surf reportRecent Eyeball Surf Reports for Okinawa

  1. weather stationWind Update Continuing clean conditions at Aha Rivermouth (light winds from the ESE at Yoron Island Airport 38 km from Aha Rivermouth). 0.4m 7s swell from the ESE with a 0.3m 2s local chop from the E and a 0.1m 12s groundswell from the ENE as well as a 0.1m 13s groundswell from the E. 4 swells combining to make bigger set waves.

    2 hours 24 minutes ago Aha Rivermouth
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38 km away, 2 h 24 min ago

7 km/h
ESE
0.0
29.9
Air / Water (°C)
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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.

View detailed surf forecast for Aha Rivermouth at:
surf-forecast.com

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 12 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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