Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 2 pm 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
29.3°C
1.9° 

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


Asakawa surf forecast from 4 Sep 2026:

  • Best quality surf: Sunday 6 Sep, 3AM (local time) - 8ft (2.4m), 7s period, E swell with cross-offshore winds.
  • Most powerful swell: Sunday 6 Sep, 6PM (local time) - 8ft (2.5m), 10s period, ESE swell with 1,367 kJ wave energy.
  • Next surfable swell (1★+): Saturday 5 Sep, 12AM (local time) - 3ft (0.9m), 10s period with SSW 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 Saturday (Sep 05) at 12AM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.5m and 6s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Asakawa in the next 16 days are 2.5m 10s and forecast to arrive on Sunday (Sep 06) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Sunday (Sep 06) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Sat 5th Sep)3ft (0.9m) 10s
Best Surf 3AM (Sun 6th Sep)8ft (2.4m) 7s
Most Powerful 6PM (Sun 6th Sep)8ft (2.5m) 10s

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


The Lowdown

Alright, let’s get into it.

The next couple of weeks are a bit of a mixed bag, but there’s a clear window of proper waves if you’re patient. We’ve got a bit of a slow start, but things pick up for a solid stretch around the 6th and 7th, before fading out into smaller, cleaner conditions later on.

The first real window kicks off Friday afternoon with a rising swell, but it’s messy. We’re looking at 5ft of south swell at 10 seconds, but the wind is howling from the NNE at 22 mph, and it’s pouring with heavy rain. The energy is moderate (437), but it’s not going to be pretty. I’d give this one a miss unless you’re desperate for a beatdown.

Saturday and Sunday morning are cleaner with lighter winds, but the swell drops away. Saturday has 3ft and 3ft of S/SSW swell, and Sunday morning is similar at 3ft. They’re surfable, but pretty ordinary to be honest. Nothing here to get excited about.

Now, here’s the standout. Sunday afternoon (the 6th) into Monday (the 7th). We see a jump in size and energy. The swell kicks up to 8ft on Sunday afternoon from the ESE at 10 seconds, and the energy jumps right up to 1287 – that’s strong. The wind is cross-offshore from the NNE at 12 mph, which will keep the faces clean. It’s going to be a proper push. This is your window if you’re an intermediate or better. That’s over the 5ft mark, so it’s not for the beginners. Monday morning holds at 7ft from the SE, and by the afternoon it’s a bit smaller at 6ft but still packing a punch. These are the best days on offer. The crowd factor at Asakawa is “sometimes,” so you might actually get a few to yourself.

After this push, things settle down. The rest of the first week and the start of the second week are small, around 3ft to 4ft, with cross-off winds that keep things clean but pretty weak. The energy drops back into the low hundreds. A lot of it is marginal or poor.

Don’t sleep on Friday the 11th, though. The morning has a clean 4ft from the east with a light breeze and “good” surf conditions. It’s small, but it might be the most fun you’ll have on a longboard. The swell direction is a bit off the optimum for this stretch, but it’s clean.

Now, going into the second week proper, the waves get really small. From the 12th onward we’re in the 1.0ft to 3ft range. The standout from this section is Thursday the 12th – we see a 1.0ft, but it’s a long-period 15-second groundswell from the east. That’s a long period, which means it’ll be lining up nicely, but there’s just not a lot of size. It’s glassy in the morning with the energy is weak (103). I wouldn’t call it a surf day, more of a splash. The wind stays light and sometimes glassy through this period, but the waves just aren't there.

There’s a two-day run of clear, glassy mornings on the 13th and 16th, which will look amazing, but the swell is tiny. The energy numbers really bottom out, hitting the low 20s by the 19th. That’s as weak as it gets. There’s just no power.

So, overall – the standout is definitely Sunday the 6th and Monday the 7th. Get on it. The setup is for a point break, and a long-period ESE swell will likely make it wall up nicely. After that, it’s a waiting game and a long, flat spell. The water temp is a touch warmer than normal for the time of year, about 85°F, which is pretty tropical, so you won’t need much rubber.

This is Rusty, signing off.

Short Range Forecast

Heavy rain (total 189mm), heaviest during Fri afternoon. Warm (max 25°C on Sat afternoon, min 21°C on Fri afternoon). Mainly fresh winds.

Days 5-7 Weather Summary

Some drizzle, heaviest during Mon afternoon. Warm (max 29°C on Tue morning, min 22°C on Wed night). Wind will be generally light.

Fri
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
1
1
1
2
2
2
2
2
2
1
1
2
1
0
0
0
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)
1.5
S
10
0.9
SSW
10
1
S
9
0.9
SSW
9
1.4
ESE
7
2.1
ESE
9
2.5
ESE
10
1.9
SE
11
2
SE
10
1.7
SE
10
1.5
SE
10
1.1
SE
9
1.2
S
11
1.7
SSE
10
1.3
SSE
9
1.3
SSE
9
1.2
SSE
8
1
SSE
8
1.1
SE
8
1.5
E
7
Wave Graph
Metric surfscale
Energy kJ
417
166
169
132
171
682
1269
846
788
557
425
186
335
561
286
238
188
140
167
211
Wind (km/h)
35
NNE
10
NNE
15
NNE
15
NNE
15
NE
20
NE
20
NNE
30
NNE
20
N
15
N
15
N
20
NNE
20
NE
15
N
15
N
20
NNE
25
N
20
NNE
15
NE
5
NE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
High Tide
9:43PM1.56m
1:51PM1.33m
11:00PM1.46m
3:35PM1.46m
1:17AM1.44m
4:19PM1.58m
2:54AM1.54m
4:52PM1.68m
3:59AM1.68m
5:21PM1.76m
4:49AM1.79m
5:47PM1.81m
Low Tide
3:51PM1.11m
5:37AM0.48m
5:35PM1.26m
7:28AM0.46m
8:34PM1.23m
8:55AM0.35m
9:45PM1.08m
9:55AM0.25m
10:28PM0.91m
10:41AM0.18m
11:04PM0.73m
11:20AM0.16m
11:38PM0.57m
heavy rain
heavy rain
light rain
light rain
light rain
mod rain
heavy rain
heavy rain
heavy rain
light rain
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:37
5:39
5:39
5:39
5:41
5:41
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:24
6:23
6:22
6:21
6:19
6:17
6:16
 mm
70
16
1
2
5
9
45
25
16
1
2
Temp °C
22
22
24
25
24
25
24
23
24
25
25
29
28
25
28
28
24
27
27
24
Feels °C
20
24
26
27
26
26
26
24
25
27
27
30
29
26
28
29
24
27
28
26
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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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