Aha Rivermouth surfForecast / Okinawa / Japan

information circle12 Day Weather and Surf, issued 2 am Saturday 06 Dec 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
25.3° C
(Which is 1.1°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 Thursday (Dec 11) at 9AM. The primary swell is predicted to be 1.4m and 8s period with a secondary swell of 0.3m and 10s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Aha Rivermouth in the next 12 days are 3.5m 9s and forecast to arrive on Saturday (Dec 13) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Thu 11th Dec)4.5ft (1.4m) 8s
Best Surf 9AM (Thu 11th Dec)4.5ft (1.4m) 8s
Most Powerful12AM (Sat 13th Dec)11ft (3.5m) 9s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 2mm), mostly falling on Mon morning. Warm (max 21°C on Sun afternoon, min 19°C on Sat morning). Mainly fresh winds.

Days 3-6 Weather Summary Moderate rain (total 10mm), heaviest on Wed night. Warm (max 21°C on Tue night, min 20°C on Tue morning). Mainly fresh winds.

Saturday
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.9
N
0.8
E
1.2
NNE
0.9
ESE
1.2
E
1.3
E
1.2
ESE
1.2
ESE
1.2
ESE
1.9
NE
1.2
ESE
1.4
E
1.3
ESE
1.3
ESE
1.5
E
1.4
ESE
1.3
E
1.6
N
2.5
E
3
E
3.5
E
Period(s) (?)8959999996109998897899
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1031107811322526422220322226027631325826430126426926774514941775
Wind
(km/h)
20
NE
20
NNE
20
NE
30
ENE
25
ENE
20
ENE
20
NE
30
NNE
25
NNE
30
NE
30
NE
25
NE
25
ENE
20
E
20
ESE
5
ENE
30
N
30
NNE
20
NE
25
E
45
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
onononononcross-
on
ononononononcross-
on
cross-
on
cross-
on
glasscross-
on
cross-
on
oncross-
on
cross-
on
High Tide
/ height (m)
7:00PM
1.94
8:35AM
1.73
7:43PM
1.89
9:20AM
1.68
8:28PM
1.80
10:06AM
1.62
9:17PM
1.67
10:56AM
1.57
10:12PM
1.53
11:49AM
1.52
11:19PM
1.38
12:45PM
1.50
12:46AM
1.27
Low Tide
/ height (m)
1:17PM
0.76
1:53AM
-0.17
2:00PM
0.78
2:38AM
-0.10
2:47PM
0.81
3:23AM
0.02
3:39PM
0.83
4:11AM
0.17
4:39PM
0.84
5:02AM
0.34
5:49PM
0.82
5:58AM
0.50
7:08PM
0.77
Saturday
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Sunrise7:01--7:01--7:01--7:03--7:03--7:03--7:05--
Sunset-5:32--5:32--5:34--5:34--5:34--5:34--5:34-
part cloud
part cloud
part cloud
clear
clear
part cloud
light rain
rain showers
part cloud
part cloud
part cloud
part cloud
rain showers
rain showers
rain showers
rain showers
part cloud
part cloud
part cloud
rain showers
heavy rain
Rain (mm)
------11----2251---412
Temp. °C202020202121202021202021212121212121222121
Feels °C (?)171716151617161516151417181919231717191915
  • 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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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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