Surf Forecasts:
Asakawa surf forecast from 30 Aug 2026:
- Best quality surf: Saturday 5 Sep, 9PM (local time) - 2ft (0.6m), 14s period, SE swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 9AM (local time) - 5ft (1.5m), 13s period, SE swell with 778 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 9PM (local time) - 2.5ft (0.7m), 7s period with SSW 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 Sunday (Aug 30) at 9PM. The primary swell is predicted to be 0.7m and 7s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.1m and 10s is also forecast. 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 1.5m 13s and forecast to arrive on Sunday (Sep 06) at 9AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 30th Aug) | 2.5ft (0.7m) 7s |
| Best Surf | 9PM (Sat 5th Sep) | 2ft (0.6m) 14s |
| Most Powerful | 9AM (Sun 6th Sep) | 5ft (1.5m) 13s |
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 Asakawa is cooking up for the next couple of weeks. It’s a bit of a mixed bag, so we gotta be patient.
We have a lot of average days ahead, with clean conditions being the main challenge. The water is sitting at a warm 84°, which is a touch warmer than normal for this time of year, so you can leave the thick wetsuit at home.
The first real glimmer of hope comes on the morning of Saturday, 5th September. The wind will be glassy, and we’ll see a 5ft swell pushing in from the SSW with moderate wave energy (359). It’s not giant, but with those clean, calm conditions, Asakawa could be pretty fun.
For the experienced crew, you want to circle Tuesday morning, 8th September. This is the standout of the whole outlook. We’ve got a solid 12ft groundswell out of the SSE with a period of 12 seconds. The wave energy is pumping hard (6429), and the wind goes glassy out of the ENE. That’s a powerful, clean swell. Be warned though, at this size it’s only for experienced surfers, and the long period means the sets will have some punch and be spaced out. The tricky part is that Asakawa is a point break, which is actually a good thing for a long period swell like this.
Before that, we have to wade through a lot of cross-onshore and onshore wind slop. The period from the 30th of August through the 4th of September is poor, with small, choppy waves and poor conditions. There are a few glassy mornings with tiny swell, but nothing worth rushing for. Also, this break is inconsistent, so don't expect non-stop action even when there is swell. Crowds are possible on the better days, so keep that in mind.
After that big Tuesday the 8th, the swell stays sizeable but the wind turns messy. By the 11th and 12th, we’re looking at fresh cross-onshore winds and lumpy conditions making for poor surf. Towards Monday the 14th, the wind cleans up again with a cross-offshore flow, but the swell drops off a touch.
Chronologically, your best bets are the glassy morning of Saturday the 5th for a smaller, clean session, and the big, clean Tuesday the 8th for the experienced crew looking for a push.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Wed morning. Warm (max 31°C on Sun afternoon, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Sat morning. Warm (max 30°C on Thu afternoon, min 25°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSW 7 | SSW 7 | S 9 | S 8 | SE 10 | ESE 13 | S 8 | S 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SE 7 | ESE 7 | ESE 9 | ESE 8 | ESE 8 | SE 9 | ESE 8 | SE 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 71 | 84 | 73 | 51 | 31 | 59 | 55 | 127 | 159 | 168 | 114 | 61 | 67 | 42 | 96 | 90 | 90 | 75 | 62 | 171 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-on | cross-on | cross | on | on | glassy | cross-on | on | glassy | cross-on | on | glassy | cross | on | glassy | cross-off | cross-off | cross-off |
High Tide | 7:14PM1.82m | 7:26AM1.80m | 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 | |||||||
Low Tide | 1:19AM0.40m | 1:31PM0.43m | 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 | ||||||||
 |  |  | |  | | | | | |  | | | | | | | |  |  | |
 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — |
 | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — |
mm | 1 | 2 | — | — | — | — | — | 2 | 3 | — | — | 2 | 2 | — | 1 | 2 | 3 | 3 | 9 | 16 |
Temp °C | 31 | 27 | 31 | 30 | 26 | 30 | 30 | 27 | 28 | 29 | 26 | 28 | 30 | 26 | 29 | 29 | 27 | 27 | 25 | 23 |
Feels °C | 35 | 32 | 34 | 33 | 30 | 32 | 32 | 32 | 32 | 32 | 31 | 32 | 34 | 32 | 33 | 33 | 33 | 31 | 28 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 10 | S 7 | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SE 7 | ESE 7 | ESE 9 | ESE 8 | ESE 8 | SE 9 | ESE 8 | ESE 8 |
| kJ | 37 | 51 | 73 | 51 | 31 | 32 | 55 | 127 | 159 | 168 | 114 | 61 | 67 | 42 | 96 | 90 | 90 | 75 | 62 | 90 |
Swell 2 Height (m) Direction Period (s) | SW 11 | SE 10 | SE 10 | SE 10 | SSW 9 | ESE 13 | ESE 12 | E 12 | E 11 | E 11 | ESE 11 | S 9 | SSW 9 | S 7 | S 8 | SSW 7 | SSE 7 | SSW 9 | SSW 10 | SE 13 |
| kJ | 4 | 38 | 25 | 25 | 31 | 59 | 52 | 70 | 61 | 58 | 37 | 39 | 46 | 22 | 32 | 18 | 18 | 46 | 56 | 171 |
Swell 3 Height (m) Direction Period (s) | E 11 | SW 9 | E 10 | SSW 10 | SE 10 | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | SSW 9 | ESE 10 | E 10 | SSW 8 | SW 10 | SW 10 | SW 10 | E 16 | SSE 8 | SSW 10 |
| kJ | 2 | 3 | 2 | 10 | 24 | 23 | 22 | 14 | 15 | 18 | 27 | 34 | 48 | 22 | 25 | 25 | 25 | 5 | 11 | 56 |
Wind waves Height (m) Direction Period (s) | SSW 7 | SSW 7 | SW 4 | SSW 3 | — | SSE 3 | — | — | — | — | — | — | — | — | — | S 8 | SSW 8 | S 8 | SSW 3 | SE 5 |
| kJ | 71 | 84 | 4 | 2 | — | 1 | — | — | — | — | — | — | — | — | — | 29 | 33 | 28 | 3 | 32 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 14 | 0 | 11 | 11 | 2 | 11 | 475 | 0 | 369 | 19 | 0 | 43 | 19 | 0 | 43 | 11 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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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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