
Surf Forecasts:
Asakawa surf forecast from 5 Aug 2026:
- Best quality surf: Thursday 6 Aug, 3PM (local time) - 18ft (5.5m), 15s period, SE swell with cross-onshore winds.
- Most powerful swell: Thursday 6 Aug, 3PM (local time) - 18ft (5.5m), 15s period, SE swell with 11,757 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 3PM (local time) - 18ft (5.5m), 15s period with SE 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 06) at 3PM. The primary swell is predicted to be 5.5m and 15s period with a secondary swell of 4.5m and 15s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 5.5m 15s and forecast to arrive on Thursday (Aug 06) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Wednesday (Aug 12) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Thu 6th Aug) | 18ft (5.5m) 15s |
| Best Surf | 3PM (Thu 6th Aug) | 18ft (5.5m) 15s |
| Most Powerful | 3PM (Thu 6th Aug) | 18ft (5.5m) 15s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s see what’s brewing for Asakawa over the next couple of weeks.
Right off the bat, we’ve got some serious, heavy water rolling in. A massive swell is hitting Thursday morning, August 6th, with waves around 15ft coming from the southeast. The ocean is absolutely thrumming with energy (8335), and that’s only going to build. The problem is, this is a big, raw, and powerful swell for a point break. The wind is up, too – a moderate cross-shore breeze – so it’s not going to be pretty. The water is a touch warmer than normal for this time of year, sitting at 84°.
By Thursday afternoon, things get even more intense. The swell pushes to 18ft from the southeast, with a very long period of 15 seconds, and the energy reading is a massive 21069. That’s a serious, deep ocean groundswell, but it’s just too much for this spot. The wind swings onshore, making it choppy. This is not a paddle session; this is big-boy, expert-only territory, and honestly, even for them, it’s a messy, dangerous proposition. This setup looks more interesting for kite surfing than paddle surfing.
Friday the 7th still holds a big 13ft SE swell, but it’s cross-onshore and choppy. The swell is still carrying a solid 13-second period, but the conditions are just poor. Saturday the 8th sees the swell drop to a more manageable 8ft, but the wind is still cross-onshore, and the quality is poor. The whole first week is a write-off for a clean, fun surf.
There’s a gap of a few days of poor-to-marginal conditions, but then we get a brief window. Tuesday morning, August 11th, the winds go glassy. The swell is down to a gentle 3ft from the SSW, with a 12-second period. It’s small, but it will be clean. The energy is weak (631), but for a logged-in, mellow session on a point break, it'll be there. The glassy conditions are the real highlight here.
The real standout, the one you’ve been waiting for, is Thursday morning, August 20th. The forecast shows a total glass-off: zero wind, clean as a whistle. The swell is a nice 4ft from the SE with a 9-second period. The energy is still modest (385), but the conditions are perfect. For a point break like Asakawa, with that optimum swell direction from the southeast, this is the best on offer. It’s an inconsistent break, so you’ll need some patience, but when a set comes through, it’ll be clean and lined up.
The Sunday before that, August 16th, also has some hope with a 7ft ESE swell under cross-offshore winds, but the period is short (7 seconds), so it’ll be a bit weak and bumpy. The 20th is the clear winner.
So, to sum it up: the first week is a no-go. The second week has some small, clean windows. The absolute best call is the dead-calm morning of Thursday, August 20th, at Asakawa. It’s not going to be epic in size, but it’s going to be perfect.
Rusty.
Short Range ForecastHeavy rain (total 63mm), heaviest during Fri night. Warm (max 31°C on Thu morning, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sun afternoon. Warm (max 30°C on Tue morning, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | |||||||||||||||
AM | 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) | SE 14 | SE 15 | SE 14 | SSE 13 | SSE 13 | SSE 12 | SSW 13 | SSW 13 | SSW 13 | SSW 14 | SW 14 | SSE 12 | SSW 13 | SSW 12 | S 11 | S 11 | SSW 12 | SSW 11 | SSW 11 | S 10 | SSW 10 |
Wave Graph | |||||||||||||||||||||
8335 | 11757 | 8108 | 5696 | 4713 | 3919 | 1901 | 1488 | 1120 | 870 | 788 | 589 | 762 | 727 | 426 | 304 | 480 | 387 | 303 | 130 | 184 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | on | glassy | glassy | glassy | off | glassy | on | cross-off |
High Tide | 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 | 3:52AM1.69m | 5:51PM1.75m | 4:49AM1.80m | 6:24PM1.81m | ||||||||
Low Tide | 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 | 10:55AM0.05m | 11:18PM0.92m | 11:39AM-0.00m | 11:58PM0.78m | ||||||||
5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | |
— | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | |
mm | — | 2 | 11 | 9 | 11 | 24 | 5 | — | 1 | 2 | 6 | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 31 | 30 | 27 | 28 | 28 | 27 | 28 | 29 | 26 | 28 | 28 | 26 | 28 | 28 | 25 | 30 | 29 | 26 | 31 | 30 | 27 |
Feels °C | 33 | 31 | 30 | 31 | 31 | 30 | 31 | 31 | 30 | 31 | 30 | 30 | 30 | 30 | 29 | 33 | 32 | 29 | 34 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 14 | SE 15 | SE 14 | SSE 13 | SSE 13 | SSE 12 | SSW 13 | SE 9 | SSW 13 | SSW 14 | SSE 12 | SSE 12 | SSW 13 | SSW 12 | S 11 | S 11 | SSW 12 | SSW 11 | SSW 11 | S 10 | SSW 10 |
8335 | 9312 | 6889 | 4999 | 4713 | 3919 | 1901 | 695 | 1120 | 870 | 633 | 589 | 762 | 727 | 426 | 287 | 480 | 387 | 303 | 130 | 184 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | E 16 | E 15 | E 15 | E 15 | SSW 13 | SE 8 | SE 8 | SW 14 | SSW 13 | E 12 | E 12 | SW 12 | SSW 12 | ESE 11 | E 11 | E 11 | SSW 11 | E 11 |
— | — | — | 5 | 4 | 4 | 4 | 1488 | 428 | 164 | 788 | 572 | 190 | 141 | 306 | 304 | 39 | 37 | 39 | 109 | 166 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SE 16 | S 12 | E 13 | E 13 | S 11 | S 11 | E 12 | ESE 11 | SE 13 | SE 13 | SE 13 | E 11 | E 15 |
— | — | — | — | — | — | — | — | 10 | 273 | 329 | 272 | 114 | 84 | 69 | 40 | 7 | 7 | 7 | 55 | 17 | |
Wind waves Height (m) Direction Period (s) | — | SE 15 | SE 14 | SE 13 | — | SE 9 | SE 9 | — | SE 8 | — | — | — | — | — | — | — | — | N 3 | NNE 4 | — | — |
— | 11757 | 8108 | 5696 | — | 1024 | 865 | — | 314 | — | — | — | — | — | — | — | — | 7 | 1 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 22 | 475 | 57 | 475 | 475 | 475 | 369 | 459 | 19 | 19 | 402 | 19 | 369 | 19 | 0 | 0 | 0 | 0 | 0 | 11 | 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.











