Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 8 pm 06 Sep 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
28.9°C
1.6° 

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


Asakawa surf forecast from 6 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 3AM (local time) - 8ft (2.5m), 10s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Wednesday 9 Sep, 3AM (local time) - 8ft (2.5m), 10s period, SSE swell with 1,365 kJ wave energy.
  • Next surfable swell (1★+): Monday 7 Sep, 6PM (local time) - 5ft (1.6m), 9s period with SE 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 (Sep 07) at 6PM. The primary swell is predicted to be 1.6m and 9s period with a secondary swell of 0.6m and 11s. 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 Wednesday (Sep 09) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Wednesday (Sep 09) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Mon 7th Sep)5ft (1.6m) 9s
Best Surf 3AM (Wed 9th Sep)8ft (2.5m) 10s
Most Powerful 3AM (Wed 9th Sep)8ft (2.5m) 10s

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


The Lowdown

Alright, Rusty here. Let me tell you about the coming swell window at Asakawa.

The next couple of weeks are looking pretty average for a point break that's usually a bit picky about when it turns on. There's a bit of action at the start, and possibly a late lingering pulse, but plenty of flat spells in between.

We kick off this Monday the 7th with a moderate SE groundswell pushing 5 ft to 6 ft and a period of 9 seconds. The energy is there, clocking in at 524 (moderate), but conditions are a bit average with a cross-offshore breeze. Tuesday the 8th looks cleaner; the swell drops to 4 ft-5 ft, switching around to the S with that same 9-second period, and lighter winds make for a tidier wave. The combined swell energy is moderate (421-547).

Wednesday the 9th sees a bit of a spike in size, with a solid 7 ft SSE swell hitting in the morning, giving a strong energy reading of 761. However, the wind goes junk with onshore and rain. The afternoon improves dramatically—the wind swings offshore from the N at 9 mph on a 5 ft SSE swell (345 energy). This is the first standout period. That offshore flow and 8-second period will make for clean, hollow lines on the point, but the swell is a bit punchy.

After that, it’s all downhill for a while. Thursday to early the following week, we've got a real dry spell. Thursday the 10th sees dropping swell (4 ft-4 ft, weak to moderate energy of 143-180) with moderate cross-off winds. Friday through Monday are dominated by tiny, weak waves, often under 3 ft, with combined energy dropping into double-digits. The water temp is about average for the time of year here.

A glimmer appears on Monday the 14th with an ESE swell rebuilding to 4 ft-5 ft and a 9-second period. The wind is mostly cross-off from the NE at 9 mph, giving cleanish conditions with moderate energy (330-608). This is the second, more modest opportunity. But Tuesday the 15th the wind turns onshore and the quality drops away again into poor.

We then hit another extended flat stretch. From Wednesday the 16th through the end of the third week, it’s mostly tiny or poor. Swell heights mostly below 3 ft, energy values sink to just 46 to 130. A couple of mornings have glassy conditions, but the surf is barely ankle-high.

Then, looking way out to Tuesday the 22nd, something interesting pops up. The data shows a clean, glassy morning with a tiny 2 ft swell, but check the period—19 seconds. That is very long-period groundswell energy, giving a combined energy of 362 (moderate). This is the most intriguing long-range prospect. At a point break, that long-period swell will wrap in beautifully and produce long, lined-up waves, even though it's small. It is very uncertain this far out, but if it materialises, it’ll be a hidden gem.

Overall, Wednesday afternoon the 9th is your best early bet—go for that offshore session. Keep an eye on Tuesday the 22nd for a potential late surprise. The rest of the window is mostly flat or ordinary.

Rusty.

Short Range Forecast

Heavy rain (total 58mm), heaviest during Wed afternoon. Warm (max 29°C on Mon morning, min 24°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 10mm), heaviest on Thu afternoon. Warm (max 29°C on Sat morning, min 22°C on Thu night). Wind will be generally light.

Monday
7
Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
1
1
2
2
2
3
1
2
1
0
1
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)
1.8
SE
9
1.5
SE
9
1.8
SE
9
1.4
SE
8
1.2
S
9
1.4
S
9
2.1
S
10
2.1
SSE
9
1.6
SSE
8
1.2
SSE
8
1.2
SSE
8
1.1
SE
8
1.1
SE
7
1
SSE
7
0.9
SSE
7
0.8
SSE
7
0.7
SSE
8
0.6
S
7
0.3
E
14
Wave Graph
Metric surfscale
Energy kJ
549
357
540
264
249
340
861
749
339
184
175
133
126
104
74
73
65
40
35
Wind (km/h)
20
NNE
15
NNE
15
NE
10
NNE
10
NNE
10
NE
10
NNE
10
ESE
15
N
15
N
20
NNE
15
N
5
NNE
0
N
10
SSW
5
NW
5
ENE
5
SE
0
WNW
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-on
off
cross-off
cross-off
cross-off
cross-off
glassy
cross-on
glassy
glassy
on
glassy
High Tide
1:17AM1.44m
4:19PM1.58m
2:54AM1.54m
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
Low Tide
8:55AM0.35m
9:45PM1.08m
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
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cloud
rain showers
rain showers
light rain
thunderstorm
heavy rain
thunderstorm
heavy rain
part cloud
rain showers
light rain
light rain
rain showers
thunderstorm
clear
part cloud
thunderstorm
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:39
5:39
5:41
5:41
5:41
5:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:22
6:21
6:19
6:17
6:16
6:15
6:14
 mm
2
2
4
1
15
18
16
1
3
1
1
2
2
1
Temp °C
24
29
27
25
26
27
26
27
25
24
24
23
24
27
28
25
29
28
26
Feels °C
25
31
29
27
29
31
30
32
28
27
23
25
29
32
32
30
33
33
32
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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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