Surf Forecasts:
Asakawa surf forecast from 12 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 6AM (local time) - 3.5ft (1.1m), 10s period, E swell with glassy winds.
- Most powerful swell: Sunday 16 Aug, 9AM (local time) - 4ft (1.2m), 10s period, ESE swell with 275 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 3AM (local time) - 2ft (0.6m), 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 Thursday (Aug 13) at 3AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.5m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.2m 10s and forecast to arrive on Sunday (Aug 16) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 13th Aug) | 2ft (0.6m) 10s |
| Best Surf | 6AM (Tue 18th Aug) | 3.5ft (1.1m) 10s |
| Most Powerful | 9AM (Sun 16th Aug) | 4ft (1.2m) 10s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G'day, Rusty here. Let's be straight with you—this stretch at Asakawa doesn't exactly have us sprinting for the wetsuit. The first week and a half is pretty bleak, with only a few fleeting moments that are barely worth a mention. The water temperature is about what you'd expect for this time of year, nothing unusual.
The real story doesn't start until Tuesday the 25th of August. That morning, we finally get something to talk about. A solid 10ft swell from the southeast, with a very long period of 16 seconds, is pumping in. That's a lot of energy (4970) and it's glassy conditions with a slight air from the east-northeast. This is proper groundswell and for a point break like Asakawa, this is the ideal setup. It'll be powerful, well-shaped, and clean. But with that size, it's strictly for experienced surfers—beginners, sit this one out. The afternoon turns onshore and messy, so get in early.
Before that, we've got a lot of nothing. From Thursday the 13th right through to Monday the 24th, the surf is small, messy, or just poor. There are a few brief windows of glassy conditions—like Saturday the 15th and the 22nd—but the swell is tiny, around 2ft to 4ft, and the energy is weak. Those are "surfable but very ordinary" days at best, with mediocre shape and little power. Not worth getting excited about.
So, to sum it up: the first eleven days are a write-off. The standout is the morning of Tuesday the 25th of August. If you're a competent surfer and you can be there, that's the one. The rest of the forecast window fades back into mediocrity. Keep an eye on the forecasts, but for now, that Tuesday morning is your only real shot.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Thu morning. Warm (max 29°C on Sat morning, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 31mm), heaviest during Sat night. Warm (max 29°C on Tue morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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) | S 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | S 10 | S 9 | ESE 6 | ESE 10 | E 10 | ESE 10 | ESE 9 | E 9 | ESE 10 | E 10 | ESE 9 | SE 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 83 | 88 | 86 | 79 | 73 | 73 | 54 | 94 | 81 | 90 | 275 | 70 | 72 | 193 | 64 | 145 | 225 | 55 | 26 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | on | glassy | cross-on | cross-on | glassy | glassy | on | glassy | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | on | glassy |
High Tide | 5:39AM1.88m | 6:54PM1.83m | 6:24AM1.90m | 7:22PM1.83m | 7:07AM1.87m | 7:49PM1.81m | 7:49AM1.78m | 8:14PM1.77m | 8:31AM1.66m | 8:38PM1.72m | 9:14AM1.51m | 9:01PM1.65m | |||||||
Low Tide | 11:58PM0.78m | 12:20PM0.01m | 00:35AM0.66m | 12:56PM0.09m | 1:12AM0.56m | 1:30PM0.22m | 1:48AM0.49m | 2:00PM0.39m | 2:24AM0.47m | 2:29PM0.58m | 3:02AM0.48m | 2:55PM0.76m | |||||||
 |  | |  | | |  |  |  | | |  | | | | | | | | |
 | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — |
 | 6:52 | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — |
mm | 5 | 5 | 4 | 1 | 2 | 3 | — | — | 2 | 13 | 1 | — | 4 | 6 | 4 | 3 | — | — | — |
Temp °C | 25 | 27 | 27 | 25 | 28 | 28 | 25 | 29 | 29 | 25 | 28 | 28 | 26 | 26 | 27 | 26 | 29 | 29 | 26 |
Feels °C | 29 | 30 | 30 | 29 | 31 | 31 | 29 | 32 | 32 | 29 | 30 | 30 | 30 | 29 | 30 | 30 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | S 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | S 10 | S 9 | S 9 | S 8 | E 10 | ESE 10 | S 8 | E 9 | SE 5 | ESE 9 | ESE 9 | SE 6 |
| kJ | 83 | 88 | 86 | 79 | 73 | 73 | 54 | 94 | 81 | 79 | 52 | 70 | 72 | 35 | 64 | 27 | 100 | 55 | 15 |
Swell 2 Height (m) Direction Period (s) | SW 10 | SE 12 | E 9 | ESE 4 | ESE 4 | E 9 | S 11 | E 10 | ESE 9 | ESE 10 | SE 12 | S 9 | S 8 | SE 11 | SSW 9 | E 10 | SSW 8 | SSW 8 | SE 10 |
| kJ | 26 | 23 | 7 | 10 | 3 | 27 | 38 | 30 | 29 | 31 | 21 | 59 | 36 | 19 | 25 | 48 | 22 | 21 | 26 |
Swell 3 Height (m) Direction Period (s) | SE 12 | E 10 | SE 12 | E 10 | E 9 | SE 11 | E 9 | SE 11 | SE 8 | SE 12 | SE 18 | SE 11 | SE 11 | — | SE 11 | SSW 8 | SE 11 | SE 10 | SSW 8 |
| kJ | 24 | 7 | 22 | 16 | 15 | 19 | 27 | 18 | 10 | 22 | 13 | 20 | 19 | — | 30 | 23 | 29 | 28 | 13 |
Wind waves Height (m) Direction Period (s) | ESE 4 | ESE 3 | ESE 4 | — | SW 4 | — | — | — | — | ESE 6 | ESE 10 | ESE 6 | ESE 6 | ESE 9 | ESE 5 | ESE 10 | E 10 | — | — |
| kJ | 5 | 2 | 8 | — | 4 | — | — | — | — | 90 | 275 | 68 | 49 | 193 | 33 | 145 | 225 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 43 | 19 | 0 | 4 | 11 | 0 | 0 | 19 | 0 | 19 | 475 | 43 | 43 | 43 | 19 | 43 | 475 | 1 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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