Asakawa Surf Break

Lat Long: 33.63° N 134.38° E

Asakawa Surf Forecast and Surf Report

Issued: 8 pm 07 Sep 2026 (local time)

Forecast update in  hr  min

Today's Asakawa sea temperature is
28.5°C
1.2° 

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


Asakawa surf forecast from 7 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 6AM (local time) - 8ft (2.5m), 9s period, SSE swell with glassy winds.
  • Most powerful swell: Wednesday 9 Sep, 12PM (local time) - 8ft (2.5m), 9s period, S swell with 1,171 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 8 Sep, 3AM (local time) - 4.5ft (1.3m), 10s 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 08) at 3AM. The primary swell is predicted to be 1.3m and 10s period with a secondary swell of 1.3m and 8s. 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 9s and forecast to arrive on Wednesday (Sep 09) at 12PM. Winds are predicted to be onshore 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+) 3AM (Tue 8th Sep)4.5ft (1.3m) 10s
Best Surf 6AM (Wed 9th Sep)8ft (2.5m) 9s
Most Powerful12PM (Wed 9th Sep)8ft (2.5m) 9s

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


The Lowdown

Alright, folks. Rusty here. Let’s have a look at what’s on the cards for Asakawa over the next couple of weeks.

Right off the bat, we’ve got a bit of a slow start. The first proper surf we see kicks off on Tuesday, the 8th of September. It’s not massive, but there’s a solid S swell rolling in at 4ft to 5ft with a 9-second period. The wind is a light cross-offshore from the NE, so it’ll be clean. The combined energy is moderate (509-623). It’s surfable, but nothing to write home about. A solid warm-up.

Now, the real standout of the first week is Wednesday, the 9th of September. We’ve got a building swell from the SSE, and by morning it’s already 8ft, pushing 10ft by the afternoon. The period drops to 8 seconds, but it’s glassy—dead flat wind from the SSE. The energy jumps big time (1915-1994). This is for experienced surfers only; it’s going to be a bit of a beast. If you’re not comfortable in solid overhead surf, sit this one out. The water temperature is about average for the time of year.

Thursday and Friday (10th & 11th) see the swell drop back, but it stays clean. Thursday has 4ft from the SSE with a cross-off wind, just ordinary. Friday morning is glassy but small at 3ft. The energy is weak (208). Not a priority.

The weekend (12th-13th) is a write-off. The swell fades to under 2ft, and we get poor conditions with onshore or cross-onshore winds. Small and choppy. There’s a gap of a few days here with nothing worth chasing.

Monday, the 14th of September, offers a little flicker. A 4ft SE swell with a 9-10 second period, glassy, and clean. Energy is moderate (245-272). It’s surfable, but not a standout.

The middle of the week is a bit of a mess. Tuesday (15th) has poor conditions with onshore winds. Wednesday (16th) is small and clean but unexciting. Thursday (17th) is a write-off with strong 12 mph winds and tiny surf. Don’t bother.

Now, hold on to your board, because the second week comes alive.

Saturday, the 19th of September, sees a punchy 8ft ESE swell with a short 7-second period. The wind is a light cross-off from the NE, so it’s clean. The energy is strong (699). This is very good, but the short period means it’ll be a bit bumpy. Best for those who like a bit of push.

Sunday, the 20th of September, is a beauty. A solid 7ft to 6ft E swell, still short period (8 seconds), but glassy calm wind. The energy is high (1028-1092). This is clean, strong, and very surfable. This is a top pick for the week.

But the absolute highlight of the whole forecast is from Monday, the 21st of September, through Wednesday, the 23rd. We get a long-period groundswell from the SE with a remarkable 16-second period. The swell size is 7ft on Monday, building to 10ft by Tuesday and Wednesday. The energy is enormous (2703-4961). This is a serious, powerful swell. The wind stays light cross-off from the NNE or NE, so it’ll be clean.

This is expert territory. At 10ft with a 16-second period, it’s going to be a heavy, straight wall at a beach break, so this is a spot where a point or reef setup would be ideal. The energy is massive. If you are an experienced surfer, this is the window. The best is on Tuesday and Wednesday, the 22nd and 23rd of September. Mark it.

Rusty.

Short Range Forecast

Heavy rain (total 50mm), heaviest during Tue morning. Warm (max 28°C on Wed morning, min 21°C on Wed night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 8mm), mostly falling on Sat afternoon. Warm (max 29°C on Sun morning, min 23°C on Thu night). Wind will be generally light.

Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
2
3
4
4
2
1
1
1
1
0
1
1
0
0
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)
1.5
SE
8
1.3
S
9
1.6
S
9
1.8
S
9
2.5
SSE
9
3
SSE
8
1.5
SSE
8
1.3
SSE
9
1.3
SSE
9
1.2
SSE
8
1
SSE
8
1
SSE
8
0.9
SSE
7
0.7
SSE
7
0.6
SSE
7
0.4
ESE
10
0.5
ESE
9
0.6
ESE
9
0.8
ESE
9
Wave Graph
Metric surfscale
Energy kJ
313
287
427
544
1081
1102
313
247
228
188
126
117
76
49
36
35
47
55
101
Wind (km/h)
10
NNE
10
NE
5
NE
5
WNW
5
SSE
5
SSE
15
N
15
N
15
NNE
10
NNE
5
SSE
15
SSW
5
NNW
5
S
10
SSW
5
SSW
5
E
5
SSE
0
E
Wind State
cross-off
cross-off
cross-off
glassy
glassy
glassy
cross-off
cross-off
cross-off
cross-off
glassy
cross-on
glassy
glassy
cross-on
glassy
glassy
on
glassy
High Tide
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
6:54AM1.85m
7:00PM1.83m
Low Tide
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
12:57PM0.43m
1:15AM0.29m
light rain
mod rain
thunderstorm
rain showers
thunderstorm
thunderstorm
light rain
rain showers
part cloud
part cloud
rain showers
thunderstorm
part cloud
rain showers
thunderstorm
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:39
5:41
5:41
5:41
5:43
5:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:21
6:19
6:17
6:16
6:15
6:14
6:13
 mm
3
8
12
5
7
10
4
1
1
2
1
4
Temp °C
25
26
26
26
28
27
23
24
25
24
27
27
25
28
28
26
29
29
26
Feels °C
28
31
31
31
34
33
25
26
27
28
31
31
30
33
32
31
33
33
32
  • 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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