Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 8 am 10 Aug 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
28.6° C
0.9° 

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


Asakawa surf forecast from 10 Aug 2026:

  • Best quality surf: Monday 10 Aug, 6PM (local time) - 3.5ft (1.0m), 10s period, S swell with offshore winds.
  • Most powerful swell: Tuesday 11 Aug, 3AM (local time) - 3.5ft (1.0m), 11s period, S swell with 238 kJ wave energy.
  • Next surfable swell (1★+): Monday 10 Aug, 6PM (local time) - 3.5ft (1.0m), 10s 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 Monday (Aug 10) at 6PM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.7m and 12s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Asakawa in the next 16 days are 1.0m 11s and forecast to arrive on Tuesday (Aug 11) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Tuesday (Aug 11) at 3PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Mon 10th Aug)3.5ft (1.0m) 10s
Best Surf 6PM (Mon 10th Aug)3.5ft (1.0m) 10s
Most Powerful 3AM (Tue 11th Aug)3.5ft (1.0m) 11s

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


The Lowdown

Alright, this is Rusty comin' to you live. Let's have a good look at what's on the cards for our local stretch at Asakawa (Japan). I’ve got a 16-day outlook right here, so let’s get into it, yeah?

This is a bit of a weird one, to be honest. The first few days look tidy enough, but we’re in for a long, quiet spell after that, especially into the second week. The early part of the window is where all the action is, with some clean chest-high stuff and light winds. After that kicks in, get ready for a lot of flat, small days that are barely worth the paddle out.

We start this week off nicely. Monday the 10th is looking like the stand out period. We’ve got chest-high sets coming from the S at 4 ft with a lovely 10-second period, and it’s clean with a light cross-offshore breeze from the NNE. The water is 84°, which is bang on average for this time of year, so no surprises there. The energy is solid too (513), enough to push you along nicely. It’s not a massive swell, but for a point break like this with good shape, that’s all you really need. Tuesday the 11th keeps that clean 3 ft S swell going, but the wind picks up a notch, making it a bit more of a cross-off, so still doable.

By Wednesday the 12th, we start to see the swell fading, dropping under 3 ft. Thursday and Friday slip into pretty ordinary territory with onshore winds and very weak energy readings down around 100 – 120. We get a brief glass-off on Friday morning the 14th, but the swell is barely breaking at 2 ft. Saturday the 15th pokes its head up with a clean 3 ft on the morning cross-off, but it feels like a tease.

Then from late next week, we hit a long flat spell. From around the 17th onwards, we’re getting a bit of a shift in swell direction (ESE), but the heights are tiny and the period drops to 6 seconds – that’s basically just wind chop. Not worth the effort. From the 19th of August all the way through to the end of the outlook on the 25th, the energy is below 150 most days, with heights barely scraping 3 ft. The 21st sees a bit of a lully 1 ft swell but with a period of 11 seconds – that’s nice energy but with that tiny height, it’s not going to do much here.

Honestly, if you don't get out Monday morning (10th) or maybe Saturday morning (15th), you’re looking at a big stretch of flatness with just a few tiny, glassy moments that are only good for a log maybe. For the rest of it? The setup gets so weak and small, with onshore winds on the afternoons, you might be better off on a kite board than a paddle board on those brief afternoons with a bit of SE wind. It’s a proper lull for Japan. Don’t hold your breath for the second week; forecasts can change, but right now it’s a write-off. For a point break, we need that S swell to stick around, but it just fades out.

Rusty out.

Short Range Forecast

Light rain (total 5mm), mostly falling on Wed night. Warm (max 30°C on Mon morning, min 22°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 17mm), heaviest on Thu morning. Warm (max 30°C on Sat morning, min 24°C on Thu morning). Wind will be generally light.

Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
2
2
1
1
1
0
0
0
0
0
1
0
1
1
0
1
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
S
10
1
S
10
1
S
10
1
S
10
1
S
10
0.9
SSW
10
0.9
SSW
10
0.7
S
10
0.8
SSW
10
0.7
SSW
9
0.7
SSW
9
0.7
S
9
0.7
S
9
0.6
S
9
0.6
S
8
0.7
S
10
0.8
S
9
0.8
SSW
10
0.6
S
9
0.6
S
9
1.2
ESE
6
Wave Graph
Metric surfscale
Energy kJ
242
190
216
216
212
173
170
88
125
88
86
79
78
55
52
90
113
128
59
57
90
Wind (km/h)
10
NNE
10
NE
15
N
15
NNE
20
NNE
10
NW
5
SSE
10
SE
5
SE
10
ESE
10
ESE
5
SSE
5
SE
10
SSE
5
WNW
5
NE
10
SE
0
WSW
5
S
10
S
5
WNW
Wind State
cross-off
cross-off
off
cross-off
cross-off
off
glassy
on
on
cross-on
cross-on
on
glassy
on
cross-off
cross-off
on
glassy
glassy
cross-on
cross-off
High Tide
5:14PM1.67m
3:52AM1.69m
5:51PM1.75m
4:49AM1.80m
6:24PM1.81m
5:39AM1.88m
6:54PM1.83m
6:24AM1.90m
7:22PM1.83m
7:07AM1.87m
7:49PM1.81m
7:49AM1.78m
8:14PM1.77m
Low Tide
10:02AM0.17m
10:33PM1.05m
10:55AM0.05m
11:18PM0.92m
11:39AM-0.00m
11:58PM0.78m
12:20PM0.01m
00:35AM0.66m
12:56PM0.09m
1:12AM0.56m
1:30PM0.22m
1:48AM0.49m
2:00PM0.39m
2:24AM0.47m
part cloud
clear
clear
clear
part cloud
part cloud
cloud
part cloud
light rain
thunderstorm
thunderstorm
thunderstorm
part cloud
clear
clear
clear
thunderstorm
thunderstorm
clear
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:20
5:20
5:20
5:22
5:22
5:22
5:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:54
6:53
6:52
6:52
6:51
6:49
6:47
 mm
5
5
4
4
1
3
3
2
Temp °C
30
30
26
30
29
25
27
25
24
25
26
25
28
28
25
30
30
26
30
29
26
Feels °C
32
32
28
29
27
27
30
27
27
29
29
28
30
31
29
32
33
31
33
32
30
  • 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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