Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 8 am 08 Sep 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
28.5°C
1.2° 

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


Asakawa surf forecast from 8 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 12AM (local time) - 10ft (3.0m), 10s period, SSE swell with glassy winds.
  • Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 10ft (3.0m), 9s period, SSE swell with 1,414 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 8 Sep, 3PM (local time) - 6ft (1.8m), 9s period with S 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 (Sep 08) at 3PM. The primary swell is predicted to be 1.8m and 9s period with a secondary swell of 1.4m and 8s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Asakawa in the next 16 days are 3.0m 9s and forecast to arrive on Wednesday (Sep 09) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Wednesday (Sep 09) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3PM (Tue 8th Sep)6ft (1.8m) 9s
Best Surf12AM (Wed 9th Sep)10ft (3.0m) 10s
Most Powerful 9AM (Wed 9th Sep)10ft (3.0m) 9s

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


The Lowdown

Alright, let's break this down. The long-range models are screaming, but we've got some flat and funky weather to wade through first.

Tuesday morning starts small and junky, a 2ft south swell at Asakawa. It's cross and a bit lumpy. But the afternoon glass-off is your chance. That south swell builds to a clean 6ft as the wind goes dead. Water's a touch warm for this time of year at 83°. That's the first real window.

Wednesday throws a bigger, messier swell at us. A 10ft south-southeast push in the morning, but it's chopped up by a cross-onshore breeze and short period. The afternoon drops to 8ft, but the wind is still not right. Too much mess for the juice.

Thursday and Friday are pretty poor. Swell drops to 3-4ft. It's clean on Friday morning, but just small and weak. Not worth suiting up for.

The weekend is a total write-off. We're talking 2ft leftovers. There's a solid 3-4 day gap where you're better off finding something else to do.

A weak pulse hits Monday, September 14th, around 5ft from the east-southeast, but it's got onshore winds and gets all chopped up. Not great.

Now, for the headline act. The following Sunday, September 20th, you can see the energy starting to build. But it’s Monday, September 21st, when it all comes together. This is the standout.

We're looking at a serious 12-13ft southeast groundswell, with a period of 18 seconds. That's a proper, long-period groundswell. And it's coming in with a moderate offshore wind all day. This is a world-class event at Asakawa. There is so much water moving (8157 to 9827 on the energy scale), this is strictly for experts. 13 feet of clean, powerful swell is not a joke. If you're charging, this is the day.

It eases a bit on Tuesday the 22nd, still a solid 8-10ft from the east-southeast, with lighter winds going glassy by the afternoon. Still excellent, but a step down and better suited for the experienced crew.

After that, it just fades out into small, weak surf for the rest of the week.

So, that's the rundown. A slow, messy start, but a monstrous window on Monday the 21st. That's the one. Mark it down, but remember, it's a long way out and forecasts can change. Still, the potential here is huge.

- Rusty

Short Range Forecast

Heavy rain (total 58mm), heaviest during Tue morning. Warm (max 28°C on Tue afternoon, min 21°C on Wed night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 13mm), heaviest on Sat afternoon. Warm (max 28°C on Sun morning, min 24°C on Fri night). Wind will be generally light.

Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
3
4
1
2
0
0
1
1
1
1
1
1
0
1
0
0
0
1
1
2
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
S
9
1.8
S
9
3
SSE
10
3
SSE
9
2.4
SSE
8
1.3
SSE
8
1.2
SSE
8
1.2
SSE
8
1.2
SSE
8
1
SSE
8
1.1
SSE
8
0.9
SSE
7
0.7
SSE
7
0.6
SSE
7
0.3
E
14
0.5
ESE
9
0.6
ESE
9
0.7
SE
9
1.5
ESE
9
1.4
SE
8
1.4
ESE
9
Wave Graph
Metric surfscale
Energy kJ
327
539
1382
1414
785
243
188
184
171
123
145
94
52
40
35
47
59
83
328
295
313
Wind (km/h)
10
ENE
5
SSE
5
S
20
SSW
10
SSW
20
N
15
N
15
N
10
NNE
5
NE
5
NE
5
NNE
5
ENE
5
E
5
NW
5
SE
10
SE
5
ESE
5
ESE
10
SE
0
NE
Wind State
cross
glassy
glassy
cross-on
cross-on
cross-off
cross-off
cross-off
cross-off
glassy
glassy
glassy
glassy
cross
glassy
cross-on
on
cross-on
cross-on
on
glassy
High Tide
4:52PM1.68m
3:59AM1.68m
5:21PM1.76m
4:49AM1.79m
5:47PM1.81m
5:34AM1.87m
6:13PM1.84m
6:15AM1.89m
6:37PM1.84m
6:54AM1.85m
7:00PM1.83m
7:31AM1.78m
7:22PM1.79m
Low Tide
9:55AM0.25m
10:28PM0.91m
10:41AM0.18m
11:04PM0.73m
11:20AM0.16m
11:38PM0.57m
11:55AM0.21m
00:11AM0.43m
12:27PM0.30m
00:43AM0.33m
12:57PM0.43m
1:15AM0.29m
1:24PM0.57m
1:46AM0.29m
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
light rain
light rain
part cloud
rain showers
light rain
thunderstorm
part cloud
thunderstorm
thunderstorm
clear
clear
thunderstorm
thunderstorm
thunderstorm
part cloud
mod rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:39
5:41
5:41
5:41
5:43
5:43
5:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:19
6:17
6:16
6:15
6:14
6:13
6:10
 mm
19
9
12
5
6
5
1
1
1
2
1
4
1
4
1
6
Temp °C
26
28
27
27
27
22
23
23
23
25
25
24
26
26
25
28
28
25
28
28
25
Feels °C
30
34
33
31
32
22
24
24
25
29
30
28
31
31
31
31
31
30
31
31
30
  • 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 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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