Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 2 pm 31 Aug 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 31 Aug 2026:

  • Best quality surf: Monday 7 Sep, 3AM (local time) - 11ft (3.5m), 11s period, E swell with glassy winds.
  • Most powerful swell: Monday 7 Sep, 3AM (local time) - 11ft (3.5m), 11s period, E swell with 2,527 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 1 Sep, 6AM (local time) - 2ft (0.6m), 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 6AM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.3m and 14s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Asakawa in the next 16 days are 3.5m 11s and forecast to arrive on Monday (Sep 07) at 3AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Sep 04) at 6PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Tue 1st Sep)2ft (0.6m) 8s
Best Surf 3AM (Mon 7th Sep)11ft (3.5m) 11s
Most Powerful 3AM (Mon 7th Sep)11ft (3.5m) 11s

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


The Lowdown

Alright, Rusty here. Let's have a look at what's headed our way for Asakawa.

The next couple of weeks are a bit of a mixed bag, with a real standout window right at the start of the second week that looks like it could be the pick of the bunch. We’ve got a long stretch of small, average-to-poor conditions to get through first, so patience is key.

The first real chance to get wet is on the afternoon of Tuesday, September 3rd. The morning is glassy but the swell is a weak 4 ft from the SSE, with a short period of 8 seconds. The energy is moderate (241). The afternoon cleans up nicely with a cross-offshore breeze, and the swell bumps up to 4 ft from the SSE, period 10 seconds, and stronger energy (342). It’s surfable, but not the standout.

Wednesday, September 4th, sees a jump in size to 6 ft from the S, but it comes with heavy rain and strong winds. The morning has a cross-off breeze and moderate energy (618), but the conditions are too rough to get excited about. The afternoon is even worse with the wind picking up.

Things stay messy through the rest of that week and into the weekend. The swell hangs around but the wind is never really on our side, and the quality just isn’t there.

The Standout

Now, the magic window is Monday, September 7th. This is the one to circle on the calendar. We’ve got a solid 7 ft swell from the ESE, with a period of 11 seconds, which is a nice long-period groundswell. The energy is strong (1181). But the best part? Glass-off conditions all morning. Zero wind from the WSW. The water is a touch warmer than normal for this time of year, sitting at 84°F. This is going to be clean, powerful, and lined up. The afternoon also looks fantastic with 7 ft from the ESE and more glassy conditions (1003 energy). This is a proper session, especially for the more experienced crew, as 7 ft is getting into the bigger range. The long period means it’ll be a bit more challenging at a beach break, but Asakawa is a point break, so it should handle that energy beautifully.

After that, the following week gets very big. By Thursday, September 10th, we’re looking at 13 ft swell from the SE with a very long 13-second period (massive energy at 5037). That’s expert-only territory, and with heavy rain and strong winds, it’s going to be a beast of a day. The conditions get onshore and messy pretty quickly after that, with the swell staying large but the wind and rain making it a write-off for clean surfing.

The last few days of the forecast, from the 12th to the 15th, look pretty grim. The swell is still there, but it’s onshore, rainy, and the quality is poor. There’s a big gap of no good surf from the 8th through to the 10th, unless you’re a big-wave charger.

Stay patient, boys and girls. The 7th is the day.

Rusty.

Short Range Forecast

Moderate rain (total 10mm), heaviest on Wed afternoon. Warm (max 31°C on Mon afternoon, min 24°C on Wed night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 172mm), heaviest during Fri afternoon. Warm (max 28°C on Thu afternoon, min 21°C on Fri afternoon). Winds decreasing (fresh winds from the NNE on Fri afternoon, light winds from the NE by Sat night).

Mon
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
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
1
1
1
2
1
2
2
1
0
1
0
0
2
2
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
S
8
0.4
SE
10
0.4
ESE
13
0.4
ESE
12
1
S
8
1.1
SSE
8
1.1
SSE
9
1.3
SSE
9
1.2
SSE
8
1.2
SSE
10
1.5
S
10
1.7
S
9
1.7
SSE
9
1
S
8
0.9
ESE
9
0.9
ESE
9
2
E
9
1.7
ESE
10
3
E
10
2.5
ESE
11
Wave Graph
Metric surfscale
Energy kJ
51
31
59
52
131
184
206
245
192
294
431
473
442
147
137
108
700
518
1680
1410
Wind (km/h)
15
S
10
SW
5
SSE
10
SSE
5
S
5
E
10
SE
5
NW
5
N
15
NE
10
NNE
20
NNE
30
NNE
25
NNE
25
NNE
20
NNE
15
ENE
15
ENE
15
ESE
10
ESE
Wind State
cross-on
cross-on
on
on
glassy
cross
on
off
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross-on
cross-on
High Tide
7:38PM1.81m
8:07AM1.73m
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
Low Tide
1:53AM0.35m
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
clear
clear
clear
clear
rain showers
thunderstorm
thunderstorm
light rain
light rain
mod rain
heavy rain
heavy rain
heavy rain
heavy rain
light rain
part cloud
rain showers
clear
clear
part cloud
<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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:30
6:29
6:28
6:25
6:24
6:23
6:22
 mm
1
1
3
2
3
7
33
34
44
52
1
1
Temp °C
31
26
30
30
26
29
28
26
27
28
24
24
23
22
24
25
25
27
27
25
Feels °C
34
30
32
32
31
33
32
32
30
31
27
25
22
22
23
25
27
28
28
27
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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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