Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 8 am 25 Aug 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
28.7°C
1.0° 

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


Asakawa surf forecast from 25 Aug 2026:

  • Best quality surf: Tuesday 1 Sep, 3AM (local time) - 4ft (1.2m), 12s period, SSE swell with glassy winds.
  • Most powerful swell: Tuesday 25 Aug, 6PM (local time) - 10ft (3.0m), 13s period, SSE swell with 2,986 kJ wave energy.
  • Next surfable swell (1★+): Friday 28 Aug, 12PM (local time) - 4ft (1.2m), 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 Friday (Aug 28) at 12PM. The primary swell is predicted to be 1.2m and 8s period with a secondary swell of 0.3m and 10s. 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 13s and forecast to arrive on Tuesday (Aug 25) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12PM (Fri 28th Aug)4ft (1.2m) 8s
Best Surf 3AM (Tue 1st Sep)4ft (1.2m) 12s
Most Powerful 6PM (Tue 25th Aug)10ft (3.0m) 13s

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 on the cards for our neck of the woods.

Right off the bat, things are messy. There’s a big pulse of swell but the wind is all wrong, so we’re looking at a pretty tough run for the next few weeks. The only real consensus is at Asakawa, a point break that’s inconsistent, but when it’s on, it has potential. The water temp is sitting at 84°F, which is about 2°F warmer than normal for this time of year – not a huge jump, but you’ll notice it feels a touch soupy.

The best we’ve got is Tuesday the 25th of August. It’s not perfect, but it’s the standout. Tuesday morning sees a solid 10ft swell from the SSE, packing some serious grunt – the combined energy is reading 4834, that’s strong to very strong. It’s a long-period groundswell at 14 seconds, so this will wrap nicely around the point. The wind is a light cross-onshore from the SSW at 6 mph, which is manageable. The trouble is, the forecast notes marginal surf conditions and questionable tides, so you’ll need to pick your moment. Expect crowds here sometimes, so you won’t be alone, but for the size, it’s the call. That size is over 8ft, so this is strictly for experienced surfers only.

Tuesday afternoon drops to 8ft, still big, but the wind swings straight onshore and the score drops. By Wednesday the 26th, the swell is fading to 7ft with the same cross-on wind, and the energy is down to 1145 – moderate now. Conditions go downhill fast after that.

From Wednesday afternoon through the end of August, it’s a long stretch of poor to marginal. The swell drops below 5ft, periods shorten up, and the wind stays cross-onshore or onshore. The combined energy dips into the two and three-digit values, weak to moderate at best. There’s a couple of glassy windows – Saturday the 29th morning has 4ft and glassy conditions, but it’s from the SSW with a short 8-second period, so the waves will be weak and fat. Sunday the 30th morning is glassy too, but only 2ft and barely any energy (88). Not worth suiting up for.

The first week of September is no better. Swell tries to build again around the 1st and 2nd, with 5ft to 6ft, but the wind is fresh and onshore – 15 to 19 mph from the east. That’s a messy, lumpy setup. A spot like Asakawa with that wind and size might actually look more appealing for a kite surfer than a paddle surfer. By the 7th of September, we get another pulse – Monday morning sees 6ft from the ESE, and Monday afternoon jumps to 8ft with the same direction, and the energy jumps to 1662 (strong). Wind is light, but the onshore component keeps it from being clean. That’s a long way out, so treat it as promising but not locked in.

After that, it fizzles into small, weak surf again.

So, to sum it up: the only real window to get something decent is Tuesday the 25th of August morning at Asakawa, if you’re experienced and can handle the size and the tide. After that, the outlook is grim for a solid week and a half, with marginal conditions and onshore winds ruling the roost. If you’re not keen on dodging wind chop, keep the board in the car.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Wed morning. Warm (max 31°C on Tue morning, min 26°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 24mm), heaviest during Sat afternoon. Warm (max 30°C on Sat morning, min 26°C on Fri night). Wind will be generally light.

Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
2
3
2
0
1
0
0
1
1
0
1
1
0
1
1
0
0
0
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)
3
SSE
14
2.5
SSE
13
2.5
SSE
12
2.1
S
11
1.6
S
12
1.3
SSW
11
1
SSW
10
1.1
SSE
10
1.2
SSW
9
1.3
S
8
1.1
S
8
0.9
S
7
1.1
SSW
8
0.9
SSW
7
0.8
SSW
8
0.7
S
8
0.4
SE
10
0.4
SE
10
0.5
SSW
9
0.6
SSE
10
0.7
SSE
10
Wave Graph
Metric surfscale
Energy kJ
3875
2005
1961
1107
699
394
194
214
207
217
157
85
128
97
75
55
36
39
47
69
83
Wind (km/h)
10
SSW
10
S
10
WSW
10
S
15
SSW
10
SW
15
SW
20
SSW
5
WSW
5
WSW
5
SSW
5
NW
5
SSW
10
SW
10
W
5
SE
10
SSW
5
WSW
5
S
10
S
5
W
Wind State
cross-on
on
cross
cross-on
cross-on
cross
cross-on
cross-on
cross
cross
cross-on
glassy
glassy
cross-on
cross-off
glassy
cross-on
cross
cross-on
on
glassy
High Tide
5:25PM1.60m
4:20AM1.60m
5:47PM1.67m
4:59AM1.70m
6:08PM1.73m
5:36AM1.78m
6:30PM1.78m
6:12AM1.83m
6:52PM1.81m
6:48AM1.84m
7:14PM1.82m
7:26AM1.80m
7:38PM1.81m
Low Tide
10:31AM0.36m
10:55PM0.96m
11:05AM0.27m
11:22PM0.84m
11:35AM0.21m
11:50PM0.72m
12:05PM0.20m
00:18AM0.60m
12:33PM0.23m
00:48AM0.49m
1:02PM0.31m
1:19AM0.40m
1:31PM0.43m
1:53AM0.35m
clear
clear
clear
rain showers
thunderstorm
part cloud
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
part cloud
rain showers
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:30
5:31
5:31
5:31
5:33
5:33
5:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:37
6:35
6:34
6:32
6:30
6:30
 mm
1
1
2
1
1
1
8
2
1
7
3
2
3
Temp °C
31
31
26
31
30
27
31
31
27
28
28
26
30
30
27
30
29
27
29
29
26
Feels °C
33
34
30
34
33
31
33
33
31
33
33
31
34
34
32
35
34
32
33
33
31
  • 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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