Aha Rivermouth surfForecast / Okinawa / Japan

information circle12 Day Weather and Surf, issued 8 pm Friday 11 Jul 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
29.1° C
(Which is 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 Saturday (Jul 12) at 9AM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.4m and 5s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Aha Rivermouth in the next 12 days are 4.5m 13s and forecast to arrive on Saturday (Jul 19) 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 3.0m 8s period and expected on Monday (Jul 14) at 9AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Sat 12th Jul)1.5ft (0.5m) 8s
Best Surf 3AM (Tue 15th Jul)4.5ft (1.3m) 8s
Most Powerful 3AM (Sat 19th Jul)15ft (4.5m) 13s

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

Updates in  hr  min  s Forecast update imminent
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
Wed
23
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
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
Wave Height (m) & direction (?)
0.5
E
0.5
E
0.5
E
0.7
E
0.7
E
0.7
E
0.6
E
0.4
ESE
0.3
E
1.5
NW
1
NNW
0.8
NNW
0.4
E
0.6
ESE
0.7
ESE
0.8
ESE
0.9
ESE
0.8
ESE
1.8
ESE
2.5
ESE
3
ESE
4
ESE
5
ESE
5.5
ESE
6.5
ESE
6.5
ESE
6
ESE
3
E
2.3
E
2.1
E
1.8
E
1.4
E
1.4
E
1.2
E
0.9
E
0.8
ENE
Period(s) (?)78999999987710109111010101112131313121211101099998814
Wave
Graph
(?)Metric surfscale
Energy (?)6152399579876233273041348255859916618117969413862131506479699805122951104387023707978755526317306204173484
Wind
(km/h)
20
SSW
20
WSW
15
WSW
10
SSW
20
WSW
25
SW
30
SW
40
WSW
30
WNW
15
NW
20
WNW
15
WNW
10
WSW
15
SSW
5
SSE
20
ESE
25
E
30
ESE
40
ESE
35
E
35
E
35
E
40
ENE
45
ENE
45
ENE
45
NE
50
NNE
45
N
45
NNW
45
NW
30
W
20
WSW
10
W
15
SSE
15
E
30
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
offcross-
off
offoffoffoffoffcross-
off
crosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
crosscross-
on
cross-
on
crosscross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
ononcross-
on
crosscrosscross-
off
cross-
off
cross-
off
cross-
off
cross-
on
cross-
on
High Tide
/ height (m)
6:59AM
1.97
8:28PM
1.87
7:40AM
1.99
9:00PM
1.88
8:23AM
1.98
9:33PM
1.88
9:09AM
1.93
10:08PM
1.86
9:59AM
1.83
10:46PM
1.83
10:58AM
1.70
11:28PM
1.80
12:13PM
1.57
12:20AM
1.77
1:54PM
1.49
1:23AM
1.75
3:44PM
1.52
2:37AM
1.77
5:04PM
1.62
3:47AM
1.83
5:58PM
1.73
4:48AM
1.91
Low Tide
/ height (m)
1:21AM
1.01
1:49PM
0.16
1:58AM
0.94
2:25PM
0.18
2:37AM
0.88
3:03PM
0.26
3:19AM
0.82
3:42PM
0.38
4:06AM
0.77
4:23PM
0.54
4:59AM
0.74
5:09PM
0.72
6:03AM
0.71
6:02PM
0.91
7:20AM
0.66
7:12PM
1.08
8:43AM
0.58
8:40PM
1.17
9:58AM
0.45
10:04PM
1.19
11:00AM
0.32
11:10PM
1.14
11:51AM
0.21
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
Wed
23
Sunrise-5:41--5:41--5:41--5:41--5:41--5:43--5:43--5:43--5:43--5:45--5:45--5:46-
Sunset--7:22--7:22--7:22--7:22--7:22--7:22--7:21--7:21--7:21--7:20--7:20--7:19
thunderstorm thunderstorm thunderstorm thunderstorm clearpart cloudthunderstorm thunderstorm thunderstorm clearclearrain showersclearclearpart cloudclearclearthunderstorm thunderstorm thunderstorm thunderstorm thunderstorm thunderstorm thunderstorm clearthunderstorm thunderstorm thunderstorm thunderstorm thunderstorm part cloudclearclearclearclearthunderstorm
Rain (mm)
11121--421--1-----3411312-22241-----2
Temp. °C282930283030282829282929282929282929282829282828282828282829292929292929
Feels °C (?)313133333332312731303131313233313130282829272726262525252628303233343331

Short Range Forecast: Heavy rain (total 22mm), heaviest during Fri night. Warm (max 30°C on Sat afternoon, min 27°C on Fri night). Winds increasing (light winds from the SSW on Sat night, fresh winds from the WSW by Mon morning).

Days 3-6 Weather Summary Light rain (total 4mm), mostly falling on Thu afternoon. Warm (max 29°C on Tue morning, min 27°C on Tue night). Winds increasing (light winds from the SSE on Wed afternoon, fresh winds from the ESE by Thu afternoon).

Days 6-9 Weather Summary Moderate rain (total 16mm), heaviest on Thu night. Warm (max 29°C on Fri afternoon, min 28°C on Thu night). Mainly near gales.

Long Range Forecast: Light rain (total 9mm), mostly falling on Mon morning. Warm (max 29°C on Mon afternoon, min 28°C on Sun night). Winds decreasing (near gales from the N on Sun night, calm by Tue afternoon).

  • 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 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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