Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 2 am 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
28.9°C
1.4° 

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


Asakawa surf forecast from 1 Sep 2026:

  • Best quality surf: Monday 7 Sep, 6AM (local time) - 10ft (3.0m), 9s period, E swell with cross-offshore winds.
  • Most powerful swell: Tuesday 8 Sep, 9AM (local time) - 10ft (3.0m), 9s period, ESE swell with 1,524 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 1 Sep, 9PM (local time) - 3ft (0.9m), 8s 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 01) at 9PM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.5m and 12s. Another secondary swell of 0.3m and 3s 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 3.0m 9s and forecast to arrive on Tuesday (Sep 08) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Thursday (Sep 03) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Tue 1st Sep)3ft (0.9m) 8s
Best Surf 6AM (Mon 7th Sep)10ft (3.0m) 9s
Most Powerful 9AM (Tue 8th Sep)10ft (3.0m) 9s

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


The Lowdown

Alright, Rusty here. Let’s have a look at what Asakawa is cooking up for the next couple of weeks.

First off, the water is sitting at 84° which is a touch warmer than we’d usually expect for this time of year. Not a game-changer, but it’s a nice little bonus when you’re sitting out there waiting for a set.

Honestly, the first few days are a bit of a write-off. We’ve got a tiny, weak swell (114 combined energy) on Tuesday morning and it doesn’t get much better through to Wednesday afternoon. The wind is onshore or cross-shore, and the conditions are just poor. You’d be wasting your time. Things start to look a little more hopeful on Thursday morning with the first glassy session (218 combined energy), but the swell is still small and weak. By Thursday afternoon though, we get our first real taste of something decent – a clean, cross-offshore wind with a 4ft SSE swell (369 combined energy) – it’s surfable and starting to shape up.

Friday the 4th is the first real standout. The morning sees a 6ft SSE swell (544 combined energy) with a clean cross-offshore breeze from the NNE. The waves will have some push, and the conditions will be clean. It’s not huge, but for intermediate surfers, this is a very solid option. Friday afternoon is similar, just a touch smaller. Saturday and Sunday stay in the fun-size range, with clean conditions, but the swell drops back a bit and the period gets shorter.

Now, hold onto your board for the second week. Monday the 7th sees the swell building again with clean cross-offshore winds, but it’s Tuesday the 8th that starts to get serious. The morning jumps to a 10ft ESE swell (2604 combined energy) – that’s strong energy. It’s still clean with a cross-offshore wind, but 10ft is getting into expert territory. Tuesday afternoon bumps that to 10ft with a 12-second period (4824 combined energy). This is where it gets real.

But the true standout of the whole outlook is Wednesday the 9th morning. We’re looking at a 10ft SE swell (4181 combined energy) with a 14-second period – that’s proper groundswell – and the wind goes offshore from the north. That’s the recipe for excellent, clean, powerful surf for experienced surfers. This is the session to circle on your calendar. The following days (10th, 11th, 12th) keep the swell pumping in the 7ft to 15ft range with clean conditions, though the wind shifts a bit. Saturday the 12th morning is another beauty: 8ft SE swell (1456 combined energy) with a glassy cross-offshore wind. But Saturday afternoon sees a cross-onshore creep in, so get your session in early.

Sunday the 13th morning is glassy with a 8ft SE swell (1244 combined energy) – another good one. But the pattern then gets a bit messy with onshore winds and risk of thunderstorms into the start of the following week. Then we get another monster pulse on Tuesday the 15th – 18ft SE swell (17105 combined energy) with a 13-second period. That’s huge. Only for experts, and with a cross-onshore wind, it’s going to be challenging. The afternoon glass-off could be exceptional for those with the skills.

So, the best on offer: Friday morning the 4th for clean, fun intermediate surf, and Wednesday morning the 9th for a powerful, clean groundswell session for the experienced crew.

Rusty.

Short Range Forecast

Heavy rain (total 34mm), heaviest during Wed night. Warm (max 30°C on Tue morning, min 23°C on Thu morning). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 71mm), heaviest during Fri afternoon. Warm (max 26°C on Sat morning, min 23°C on Fri afternoon). Wind will be generally light.

Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
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
1
0
1
1
1
2
3
2
2
1
1
0
2
2
1
2
2
2
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
ESE
13
0.5
E
12
1
S
8
1.1
SSE
8
1.1
S
9
1.1
SSE
9
1.1
SSE
8
1.3
SSE
10
2
SSE
10
1.8
SSE
9
1.5
SSE
9
1.9
SE
8
1.2
SE
8
1.4
SE
7
1.8
ESE
8
1.6
ESE
7
1.7
ESE
6
2.1
ESE
7
1.7
ESE
8
1.7
ESE
9
2.4
ESE
8
Wave Graph
Metric surfscale
Energy kJ
59
80
130
184
199
193
153
320
742
537
328
473
160
188
375
254
245
482
414
443
723
Wind (km/h)
5
SSE
10
SSE
5
SSW
10
ENE
10
ESE
0
E
5
S
10
NNE
10
N
15
NNE
15
NE
15
ENE
15
NNE
15
E
15
ENE
15
NE
10
ENE
15
NE
15
NNE
10
NE
10
N
Wind State
on
on
glassy
cross
cross-on
glassy
glassy
cross-off
cross-off
cross-off
cross-off
cross
cross-off
cross
cross-off
cross-off
cross
cross-off
cross-off
cross-off
cross-off
High Tide
8:03PM1.78m
8:53AM1.61m
8:30PM1.72m
9:51AM1.47m
9:02PM1.65m
11:18AM1.35m
9:43PM1.56m
1:51PM1.33m
11:00PM1.46m
3:35PM1.46m
1:17AM1.44m
4:19PM1.58m
2:54AM1.54m
Low Tide
2:01PM0.58m
2:31AM0.33m
2:32PM0.75m
3:16AM0.36m
3:06PM0.93m
4:13AM0.42m
3:51PM1.11m
5:37AM0.48m
5:35PM1.26m
7:28AM0.46m
8:34PM1.23m
8:55AM0.35m
9:45PM1.08m
clear
clear
part cloud
thunderstorm
thunderstorm
thunderstorm
mod rain
mod rain
light rain
mod rain
heavy rain
heavy rain
rain showers
rain showers
rain showers
part cloud
cloud
heavy rain
heavy rain
heavy rain
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:35
5:35
5:37
5:37
5:37
5:39
5:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:29
6:28
6:25
6:24
6:23
6:22
6:21
 mm
2
2
12
7
8
3
6
18
17
2
2
1
25
56
35
2
Temp °C
30
30
26
29
29
26
24
23
24
24
24
24
26
25
24
26
25
23
24
24
24
Feels °C
33
33
31
33
33
31
28
26
27
26
27
26
26
26
25
27
27
25
27
27
27
  • 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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