Surf Forecasts:
Asakawa surf forecast from 4 Aug 2026:
- Best quality surf: Thursday 6 Aug, 3PM (local time) - 18ft (5.5m), 14s period, SE swell with cross-onshore winds.
- Most powerful swell: Thursday 6 Aug, 3PM (local time) - 18ft (5.5m), 14s period, SE swell with 12,240 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 3AM (local time) - 13ft (4.0m), 16s period with ESE 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 3AM. The primary swell is predicted to be 4.0m 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 5.5m 14s and forecast to arrive on Thursday (Aug 06) at 3PM. 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 (Wed 5th Aug) | 13ft (4.0m) 16s |
| Best Surf | 3PM (Thu 6th Aug) | 18ft (5.5m) 14s |
| Most Powerful | 3PM (Thu 6th Aug) | 18ft (5.5m) 14s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, Rusty here, and we’ve got a serious wall of water heading for Asakawa (point). This isn’t a day for the faint-hearted. The first half of the week is pumping with groundswell – we’re talking 15ft to 18ft of swell, with a very long period of 16 seconds, coming out of the ESE and SE. The combined energy is huge, clocking in at 9886 up to a massive 21874. That’s a lot of power. The issue is the wind: it’s blowing cross or cross-on from the east and east-northeast, putting a bit of chop on the face. For a point break like Asakawa, this kind of size and period is for experienced surfers only. Thursday morning (August 6) has the swell at 16ft with energy at 9564, still cross. By Thursday afternoon, the swell hits 18ft with energy at 21874, but it’s too big for most, and the wind stays cross-on. Friday (August 7) keeps the size at 16ft with a long period, but the wind remains messy.
The water temp is about average for the time of year.
The clear standout is Thursday, the 13th of August. The morning is glassy – dead calm – with a 4ft SSW swell and an 11-second period. The energy is low at 449, but it’s clean, organised, and the point will be reeling. This is the best quality surf of the whole run. The afternoon stays glassy with 3ft from the south. This is your window for smooth, peeling waves.
After that, the swell drops off hard. For several days, we’re looking at under 3ft, with a lot of poor or marginal conditions. The wind turns onshore or cross-on from the south and southeast, and the energy readings fall below 300. There’s a small chance on Tuesday morning (August 18) with glassy conditions and a 5ft ESE swell, but the period is short at 7 seconds, so it’s weak.
The real late-session highlight is Wednesday, the 19th of August. The morning shows clean 5ft easterly swell with a 10-second period, and light offshore winds from the northeast. The energy is moderate at 877, and it’s labelled “expect very good surf conditions.” That’s a solid day for long, lined-up rides. The afternoon goes glassy with a 4ft ESE swell.
So, the first week is for the big-wave hunters who can handle chop, but the true gems are that glassy Thursday morning (August 13) and the clean, offshore Wednesday (August 19). If you’re patient, those are your days.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Fri afternoon. Warm (max 31°C on Wed afternoon, min 25°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 47mm), heaviest during Fri night. Warm (max 28°C on Sat morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | ||||||||||||||
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) | ESE 16 | ESE 16 | SE 16 | SE 15 | SE 14 | SE 14 | SSE 15 | SSE 16 | SSE 15 | S 15 | SSW 15 | SSW 14 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 8364 | 9886 | 10807 | 9790 | 9564 | 12240 | 10535 | 11494 | 10867 | 4618 | 4221 | 3566 | 4982 | 6278 | 4784 | 4084 | 3740 | 2852 | 2309 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross-on | cross-off | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 9:19PM1.69m | 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 | |||||||
Low Tide | 3:47AM0.54m | 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 | |||||||
 |  | | | |  |  |  | | | | | |  | |  |  | |  | |
 | — | 5:16 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — |
 | 7:00 | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — |
mm | — | — | — | — | — | 2 | 4 | 3 | 7 | 13 | 7 | 4 | 5 | 5 | 6 | 4 | — | 3 | 7 |
Temp °C | 26 | 30 | 31 | 27 | 30 | 31 | 27 | 29 | 28 | 27 | 28 | 28 | 26 | 26 | 27 | 26 | 27 | 26 | 26 |
Feels °C | 29 | 32 | 33 | 30 | 31 | 33 | 31 | 30 | 30 | 30 | 30 | 30 | 28 | 27 | 28 | 27 | 28 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | ESE 16 | ESE 16 | SE 16 | SE 15 | SE 14 | SE 15 | SSE 15 | SSE 16 | SSE 15 | S 15 | SSW 15 | SSW 14 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 |
| kJ | 8364 | 9886 | 10807 | 9790 | 9564 | 9634 | 10535 | 11494 | 8581 | 4618 | 4221 | 3566 | 4982 | 6278 | 4784 | 4084 | 3740 | 2852 | 2309 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ESE 13 | SE 15 | SE 14 | SE 14 | E 12 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 212 | 9 | 8 | 8 | 44 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | SE 14 | — | — | SSE 15 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 9 | SE 9 | SE 9 | ESE 8 | SE 8 | SE 8 |
| kJ | — | — | — | — | — | 12240 | — | — | 10867 | 2033 | 2137 | 2033 | 1478 | 1320 | 1325 | 1474 | 1367 | 1168 | 616 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 43 | 245 | 0 | 22 | 475 | 57 | 475 | 475 | 473 | 503 | 475 | 459 | 510 | 459 | 1037 | 1037 | 1037 | 282 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Asakawa surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest