Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 2 am 16 Aug 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
28.4° C
0.7° 

Asakawa surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Asakawa surf forecast from 16 Aug 2026:

  • Best quality surf: Friday 21 Aug, 3AM (local time) - 4ft (1.2m), 11s period, S swell with glassy winds.
  • Most powerful swell: Friday 21 Aug, 6AM (local time) - 4.5ft (1.4m), 11s period, S swell with 467 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 18 Aug, 12AM (local time) - 1.5ft (0.4m), 11s period with SE swell.

Best Forecast Surf Conditions for Asakawa this week:

The surf forecast for Asakawa over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 12AM. The primary swell is predicted to be 0.4m and 11s period with a secondary swell of 0.4m and 8s. Another secondary swell of 0.7m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Asakawa in the next 16 days are 1.4m 11s and forecast to arrive on Friday (Aug 21) at 6AM. Winds are predicted to be glassy at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Tue 18th Aug)1.5ft (0.4m) 11s
Best Surf 3AM (Fri 21st Aug)4ft (1.2m) 11s
Most Powerful 6AM (Fri 21st Aug)4.5ft (1.4m) 11s

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


The Lowdown

G’day, it’s Rusty here.

Let’s be straight with you—this outlook for the next couple of weeks is a bit of a mixed bag, but there is some serious potential hiding in the back half. The start is dead, absolutely dead. We’re looking at a solid blank run of about eight days where there’s just nothing worth paddling out for at Asakawa. The swell is tiny, the wind is mostly onshore or cross-onshore, and the energy in the water is weak, with combined swell energy values mostly in the double digits, struggling to break past 100. We’re talking knee-to-waist high slop, man. Save your energy.

The first real glimmer shows up on Friday the 21st. We see a pulse of S swell pushing the wave height up to 5ft, but the period is a short 11 seconds. The combined energy jumps to a moderate 548, but it’s just not enough to clean it up. The wind is light but cross-onshore, making it lumpy and weak. It’s marginal at best, a real maybe-morning-session kind of call.

The next week stays pretty lackluster. There’s some inconsistent SSW swell, but it’s small and messy. The water hit 83°F at the start of the period, which is right on the average for this time of year, so nothing weird there.

Now, pay attention because this is where it gets interesting. The standouts are on Monday the 24th and Tuesday the 25th. A proper, long-period SE groundswell rolls in. We’re talking 16 second period. Monday afternoon sees 7ft waves and the combined energy jumps to a strong 1989. It’s big and it’s powerful. Tuesday morning is still big at 8ft, and then the magic window hits Tuesday afternoon. The wind goes glass, absolutely glass, and the swell holds at 8ft with 16-second period. The energy is pumping at 3699. This is the best conditions for experienced surfers, full stop. This is the one to circle. This point break at Asakawa is going to have some proper lines, especially with that long period. It’s a point break, so it should handle the long-period energy well. But heads up, this is inconsistent, and with a swell this size, it’s pushing into expert territory. This is not for beginners.

The run continues into the rest of that week. Wednesday the 26th is still solid, but the wind turns onshore. Thursday the 27th, though, is another gem. We’re seeing 12ft of SE swell and the wind goes cross-offshore from the NE in the morning. The energy is massive, a very strong 5343. That’s going to be a beast of a day, big and powerful. Again, for experts only.

Don’t get too excited about the weekend, though. Friday the 28th turns to garbage. The wind howls onshore from the E at 19 mph and the swell jumps to 13ft, but it’s messy, lumpy, blown-out chaos. Then Saturday the 29th is just ridiculous. It’s way too big, with 25ft of SE swell and 25 mph onshore winds. That’s not surfing, that’s a survival mission. Even the forecast is telling us it’s too big for the break. It’s more of a kite-surfing day with that much wind and swell.

The very end of the window, Sunday the 30th and Monday the 31st, backs off a bit. The swell drops back to 10ft and 12ft with cross-offshore winds, so it cleans up nicely, but the period drops back down to 9 seconds. It’ll still be fun and powerful, but not the perfection of the earlier days.

So, bottom line: the first week is a write-off. The second week, from the 24th through the 27th, is where the real deal is. The absolute standout is Tuesday the 25th afternoon. Get on it, but be ready. This is big, serious surf.

Rusty, out.

Short Range Forecast

Heavy rain (total 23mm), heaviest during Sun morning. Warm (max 28°C on Mon morning, min 25°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 28°C on Wed morning, min 24°C on Wed night). Wind will be generally light.

Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
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
1
0
0
1
0
0
0
0
0
1
1
1
2
0
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
ESE
5
1.5
ESE
6
1.3
ESE
6
0.9
SE
5
0.4
SE
11
0.4
SE
11
0.6
ESE
8
0.7
ESE
9
0.7
ESE
8
0.7
ESE
8
0.6
ESE
8
0.4
SE
10
0.7
E
7
0.7
S
9
1.1
S
9
1.4
S
11
1.4
S
11
1.2
SSW
10
1
SSW
10
1
SSW
10
0.9
SSW
10
Wave Graph
Metric surfscale
Energy kJ
111
164
108
45
30
30
45
65
61
59
50
25
52
80
201
466
441
306
209
209
132
Wind (km/h)
10
SE
15
SE
10
SE
10
SE
10
SSE
5
SSE
10
SE
10
SSE
5
SSE
10
SE
10
SSE
5
WSW
5
SE
10
SSE
5
S
10
SE
10
SSE
0
W
10
SE
10
SSE
0
SE
Wind State
cross-on
on
cross-on
on
on
glassy
on
on
glassy
cross-on
on
glassy
on
on
glassy
cross-on
on
glassy
cross-on
on
glassy
High Tide
8:14PM1.77m
8:31AM1.66m
8:38PM1.72m
9:14AM1.51m
9:01PM1.65m
10:05AM1.37m
9:25PM1.57m
11:17AM1.25m
9:52PM1.48m
2:05PM1.21m
10:36PM1.39m
4:20PM1.32m
00:36AM1.34m
Low Tide
2:00PM0.39m
2:24AM0.47m
2:29PM0.58m
3:02AM0.48m
2:55PM0.76m
3:42AM0.53m
3:19PM0.92m
4:31AM0.59m
3:42PM1.07m
5:42AM0.66m
4:07PM1.20m
7:28AM0.66m
8:19PM1.26m
mod rain
thunderstorm
rain showers
part cloud
part cloud
rain showers
thunderstorm
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
part cloud
part cloud
clear
part cloud
thunderstorm
part cloud
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:24
5:24
5:26
5:26
5:26
5:28
5:28
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:47
6:46
6:45
6:45
6:44
6:43
6:40
 mm
7
7
5
3
1
2
2
Temp °C
26
26
26
28
28
26
28
28
26
28
28
25
28
28
26
28
28
25
29
29
26
Feels °C
29
28
29
30
30
30
31
31
31
31
31
30
31
32
31
31
31
30
33
33
32
  • 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 Asakawa Surf forecast

The above surf forecast table for Asakawa provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Asakawa can be found by selecting the local surf guide option on the grey menu. Our Asakawa 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 (Asakawa) 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 Asakawa 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.

Are you planning a holiday in Shikoku? If you are looking for accommodation near Asakawa, camping, hotels and holiday cottages in Shikoku, consider staying in Anan which is 41 km (25 miles) away. Other places in and around Shikoku where you can find information about places to rent, and car hire include Muroto which is 44 km (27 miles) away, Komatsushima, Aki and Kamojima.

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