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Surf Forecasts:

Aha Rivermouth surfForecast / Okinawa / Japan

information circle16 Day Weather and Surf, issued 8 am Monday 16 Mar 2026 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
21.1° C
 (Which is slightly cooler than normal)

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 (Mar 18) at 3AM. The primary swell is predicted to be 1.5m and 14s period with a secondary swell of 0.2m and 5s. 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 1.8m 16s and forecast to arrive on Tuesday (Mar 17) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Sunday (Mar 22) at 6PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Wed 18th Mar)5ft (1.5m) 14s
Best Surf 3AM (Wed 18th Mar)5ft (1.5m) 14s
Most Powerful12AM (Tue 17th Mar)6ft (1.8m) 16s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Mostly dry. Warm (max 20°C on Wed afternoon, min 17°C on Mon morning). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Thu afternoon. Warm (max 22°C on Sat afternoon, min 18°C on Thu afternoon). Wind will be generally light.

Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
2
2
2
3
3
2
3
2
3
2
2
2
2
2
2
2
2
1
1
1
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.8
ENE
1.6
ENE
1.8
ENE
1.7
ENE
1.6
ENE
1.5
ENE
1.4
ENE
1.3
ENE
1.2
ENE
1.1
ENE
1
ENE
1
ENE
1
ENE
1
ENE
0.9
ENE
0.8
ENE
0.8
ENE
0.7
ENE
0.7
ENE
0.6
ENE
0.5
ENE
Period(s) (?)131316161614141414131314141414131313141413
Wave
Graph
(?)Metric surfscale
Energy kJ (?)112784116111411123091779967252242132634740038929420119814917512196
Wind
(km/h)
10
NNE
15
N
10
NNE
10
NNE
5
NNE
5
ESE
15
S
20
SSW
15
SW
20
SW
10
WSW
5
ENE
15
S
20
SSW
15
SW
20
SSW
20
SW
5
NNW
10
S
20
WSW
5
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		cross-
on		ononcrosscross-
off		cross-
off		offoffoffglasscross-
off		offoffoffoffglasscross-
off		offcross-
on
High Tide
/ height (m)
5:16PM
1.54
6:11AM
1.61
5:55PM
1.69
6:34AM
1.70
6:33PM
1.80
6:59AM
1.76
7:11PM
1.86
7:26AM
1.81
7:50PM
1.86
7:53AM
1.83
8:30PM
1.80
8:22AM
1.81
9:13PM
1.68
Low Tide
/ height (m)
11:33AM
0.67
11:45PM
0.16
12:01PM
0.49
12:18AM
0.10
12:31PM
0.32
12:50AM
0.10
1:02PM
0.17
1:21AM
0.14
1:35PM
0.05
1:53AM
0.23
2:11PM
-0.01
2:25AM
0.36
2:50PM
-0.01
2:58AM
0.51
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Sunrise6:35--6:35--6:33--6:31--6:31--6:30--6:28--
Sunset-6:35--6:36--6:36--6:37--6:37--6:37--6:37-
clear
clear
part cloud
cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
light rain
rain showers
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
thunderstorm
rain showers
Rain (mm)
----------11-------21
Temp. °C171718181818192020212119212120212220222220
Feels °C (?)151517171717161718202120201919192020212122
  • 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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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 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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