Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 8 am 05 Aug 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
29.1° 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 5 Aug 2026:

  • Best quality surf: Wednesday 5 Aug, 6PM (local time) - 15ft (4.5m), 16s period, SE swell with glassy winds.
  • Most powerful swell: Thursday 6 Aug, 3PM (local time) - 16ft (5.0m), 14s period, SE swell with 10,852 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 5 Aug, 6PM (local time) - 15ft (4.5m), 16s 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 Wednesday (Aug 05) at 6PM. The primary swell is predicted to be 4.5m and 16s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Asakawa in the next 16 days are 5.0m 14s and forecast to arrive on Thursday (Aug 06) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Aug 12) at 9AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Wed 5th Aug)15ft (4.5m) 16s
Best Surf 6PM (Wed 5th Aug)15ft (4.5m) 16s
Most Powerful 3PM (Thu 6th Aug)16ft (5.0m) 14s

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


The Lowdown

Alright, let’s get into it.

The long-range picture has a bit of a rough start, but there’s a proper pulse lurking a week and a half out that’s worth keeping an eye on. The first few days are a bit messy, with cross-shore and cross-onshore winds messing with the swell. It’s not a total washout, but you’ll be working for it.

The first real window is Wednesday morning, August 5th. The swell is a solid 15ft from the ESE at 16 seconds, which is proper groundswell. The wind is light cross from the ENE, so it’ll be a touch textured but not terrible. The energy is strong, reading 9886, and the water is a touch warmer than usual at 84°F, which is a bit notable for the time of year. This is a big, powerful wave, so it’s not for the faint of heart. It might be a bit much for beginners, but for the experienced crew, it’s got some punch.

The rest of that first week is a downgrade. By Thursday afternoon, the wind picks up and it gets choppy, and it stays that way through the weekend. The swell drops, the wind swings onshore, and there’s a lot of cross-chop. It’s not worth paddling out for unless you’re desperate for a fight. There are a few stormy periods with that easterly wind, so it’s going to be a messy few days.

Then we hit a bit of a lull from Monday the 10th through to the 14th. The swell drops off hard, and while there are some glassy mornings, the waves are small and weak. The 11th and 12th have some clean, glassy conditions, but the swell is only around 4ft to 5ft from the SSW. There’s a window on the morning of the 11th with zero wind and a 4ft SSW swell at 12 seconds, but it’s pretty gutless. It’s surfable but not worth getting excited about.

Here’s the standout. The swell arrives on Tuesday, August 19th. The morning is looking like the pick of the whole period. We’ve got a 13ft swell from the SE at 15 seconds, with light offshore cross-off winds from the NE. The energy is strong at 6081, and the conditions are clean. This is a proper groundswell, and at a point break like Asakawa, that long period should wrap in nicely. This is the one you’ve been waiting for. It’s big, so it’s strictly for the experienced surfers—this is well over 8ft, so the beginners need to stay on the beach. The afternoon before, on the 18th, has some promise too, with a 4ft SE swell at 18 seconds, but the morning of the 19th is the one.

The last couple of days look like a step down again, with the swell backing off and the wind turning onshore, but that one morning is the golden ticket.

So, in short: the next week is mostly a struggle, but hold out for Tuesday the 19th. That’s your day.

Rusty

Short Range Forecast

Heavy rain (total 43mm), heaviest during Fri afternoon. Warm (max 31°C on Wed afternoon, min 26°C on Wed night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 17mm), heaviest on Sun night. Warm (max 29°C on Sat morning, min 25°C on Sat night). Wind will be generally light.

Wednesday
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
7
7
7
4
0
6
5
0
3
2
1
3
2
0
1
0
1
3
3
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)
4.5
ESE
16
4.5
SE
16
4.5
SE
15
4.5
SE
14
5
SE
14
4.5
SSE
15
4.5
SSE
14
4.5
SSE
14
4
SSE
13
2.5
S
13
2.5
SSW
13
2.3
SSW
13
2.1
E
13
1.7
SSW
14
1.6
SSW
14
1.4
SW
14
1.7
SSW
13
1.8
SSW
13
1.2
S
12
1.6
SSW
12
1.5
SSW
11
Wave Graph
Metric surfscale
Energy kJ
9886
10672
8711
7714
10852
9049
8490
7235
5595
2431
2338
1929
1538
1176
929
743
965
1044
410
669
553
Wind (km/h)
5
ENE
10
ESE
10
NNE
20
ENE
25
E
15
ENE
20
E
25
ESE
20
E
20
E
20
ESE
15
ENE
15
E
20
ESE
15
E
20
E
15
ESE
5
SE
0
SSW
5
SSE
5
WSW
Wind State
cross
cross-on
cross-off
cross
cross-on
cross
cross
cross-on
cross-on
cross
cross-on
cross
cross
cross-on
cross-on
cross-on
cross-on
glassy
glassy
on
cross
High Tide
9:59AM1.47m
9:52PM1.64m
11:18AM1.36m
10:35PM1.58m
1:18PM1.32m
11:38PM1.53m
3:21PM1.41m
1:11AM1.52m
4:29PM1.55m
2:42AM1.58m
5:14PM1.67m
3:52AM1.69m
5:51PM1.75m
Low Tide
3:40PM0.78m
4:44AM0.52m
4:27PM0.97m
6:00AM0.50m
5:43PM1.14m
7:33AM0.43m
7:55PM1.22m
8:57AM0.31m
9:34PM1.16m
10:02AM0.17m
10:33PM1.05m
10:55AM0.05m
11:18PM0.92m
clear
clear
clear
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
rain showers
clear
thunderstorm
rain showers
thunderstorm
rain showers
rain showers
part cloud
part cloud
part cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:16
5:16
5:18
5:18
5:18
5:20
5:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:59
6:59
6:58
6:57
6:55
6:54
6:53
 mm
3
8
8
9
15
1
4
1
3
7
1
Temp °C
30
31
27
31
30
27
28
28
26
29
29
26
28
28
26
28
28
26
29
29
26
Feels °C
32
33
30
33
31
31
31
30
28
30
30
30
30
29
29
29
29
30
32
32
29
  • 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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