Surf Forecasts:
Asakawa surf forecast from 13 Aug 2026:
- Best quality surf: Monday 17 Aug, 6AM (local time) - 3.5ft (1.1m), 10s period, ESE swell with glassy winds.
- Most powerful swell: Thursday 20 Aug, 12AM (local time) - 4.5ft (1.3m), 9s period, SSE swell with 255 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 6PM (local time) - 2.5ft (0.7m), 9s 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 Thursday (Aug 13) at 6PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.6m and 4s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.3m 9s and forecast to arrive on Thursday (Aug 20) at 12AM. 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+) | 6PM (Thu 13th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 6AM (Mon 17th Aug) | 3.5ft (1.1m) 10s |
| Most Powerful | 12AM (Thu 20th Aug) | 4.5ft (1.3m) 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 shaping up for Asakawa. I gotta be straight with you – the next week and a half is mostly a write-off. We’re looking at a long, frustrating gap of poor surf right through until the morning of Thursday the 20th. For days on end, the swell is tiny, the wind is mostly onshore or cross-onshore, and conditions are just plain ugly. There’s a brief moment of hope on Saturday the 15th morning when that glassy wind brushes the surface, but the swell is only 2ft from the south, with combined energy of just 117 – weak sauce. It’s surfable, but nothing to get excited about.
The real story, the one that gets my heart pumping, is the last week of the forecast. The morning of Sunday the 23rd of August is where it all changes. We’ve got a solid 5ft swell rolling in from the southeast with a very long period of 15 seconds – that’s serious groundswell energy. The combined energy reading is a massive 1099, and the wind is a light cross-offshore breeze from the northeast. That’s clean surf, folks. Now, this is a point break, and that long period swell is perfect for it – expect nice, lined-up waves. The catch is, at 5ft, it’s getting into the intermediate zone, not ideal for beginners. And the crowds? They’re possible here, so get out early.
The absolute standout, the one you circle on the calendar, is Monday the 24th of August. The morning sees a 8ft swell from the southeast, period still a very long 15 seconds, and the combined energy jumps to 2396. The wind is light and cross-shore from the east-northeast. This is big, powerful, clean surf. But I have to warn you – at 8ft by the afternoon, this is expert territory. The waves will be demanding, and the tide could be a factor. This is not a day to be casual. If you’re a confident surfer on a point break, this is your window. The water temperature is sitting at 84°, which is about average for the time of year.
The following Tuesday morning, the 25th of August, is still pumping with a 8ft swell from the east-southeast, combined energy of 2225, but the wind swings around to a gentle cross-shore. It’s still good, but it’s a hair messier than the day before. By Wednesday the 26th, the swell drops off and the wind turns onshore again, closing the window.
So, to sum it up for you: the first week is a dud. Don’t bother. The real action kicks off on the 23rd, with Monday the 24th being the best bet for the experienced crew. It’s a long way out, so keep an eye on it, but the signs are promising.
- Rusty
Short Range ForecastHeavy rain (total 21mm), heaviest during Sat night. Warm (max 29°C on Fri morning, min 24°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 34mm), heaviest during Sun night. Warm (max 29°C on Tue afternoon, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 8 | S 10 | S 9 | S 9 | E 10 | E 10 | E 10 | ESE 10 | E 10 | SE 5 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SSE 9 |
Wave Graph | |||||||||||||||||||||
88 | 86 | 79 | 73 | 73 | 52 | 94 | 79 | 76 | 71 | 71 | 68 | 214 | 71 | 30 | 29 | 28 | 27 | 26 | 27 | 255 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | glassy | cross-on | on | glassy | glassy | on | cross-on | cross-on | on | cross-on | on | on | cross-on | cross-on | on | glassy | cross-on | on | cross |
High Tide | 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 | 10:05AM1.37m | 9:25PM1.57m | ||||||||
Low Tide | 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 | 3:42AM0.53m | 3:19PM0.92m | ||||||||
5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | |
— | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | |
mm | 4 | 3 | — | 1 | 2 | — | — | 1 | 10 | 2 | 2 | 8 | 4 | 6 | 6 | 2 | — | 4 | 3 | 1 | 2 |
Temp °C | 27 | 27 | 25 | 29 | 28 | 25 | 29 | 29 | 25 | 27 | 28 | 26 | 27 | 27 | 26 | 28 | 29 | 26 | 29 | 29 | 27 |
Feels °C | 30 | 30 | 30 | 31 | 31 | 29 | 32 | 32 | 29 | 29 | 30 | 30 | 30 | 30 | 31 | 32 | 32 | 31 | 34 | 33 | 33 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 8 | S 10 | S 9 | S 9 | S 8 | S 9 | E 10 | ESE 10 | E 10 | SE 5 | SSW 8 | SE 4 | SE 4 | SE 5 | SE 5 | SSE 9 |
88 | 86 | 79 | 73 | 73 | 52 | 94 | 79 | 76 | 51 | 56 | 68 | 214 | 71 | 25 | 20 | 6 | 6 | 13 | 27 | 255 | |
Swell 2 Height (m) Direction Period (s) | SE 12 | E 9 | ESE 4 | ESE 9 | ESE 9 | S 11 | E 10 | E 10 | ESE 10 | E 10 | E 10 | S 8 | S 8 | SSW 8 | E 10 | SE 11 | SSW 8 | SE 10 | SE 10 | SE 10 | SSW 9 |
23 | 7 | 6 | 28 | 29 | 37 | 17 | 30 | 31 | 71 | 71 | 35 | 33 | 21 | 30 | 29 | 20 | 27 | 26 | 26 | 8 | |
Swell 3 Height (m) Direction Period (s) | E 10 | SE 12 | E 10 | SE 11 | SE 11 | E 9 | SSE 8 | SE 8 | SE 12 | SE 12 | SE 11 | SE 11 | SE 11 | SE 11 | SSW 8 | E 9 | SE 10 | SSW 8 | SSW 8 | SSW 8 | E 8 |
7 | 22 | 16 | 20 | 19 | 28 | 6 | 10 | 22 | 35 | 20 | 42 | 42 | 42 | 22 | 15 | 28 | 12 | 6 | 6 | 5 | |
Wind waves Height (m) Direction Period (s) | ESE 3 | ESE 4 | S 3 | — | ESE 2 | — | — | — | ESE 4 | ESE 5 | ESE 5 | ESE 5 | — | ESE 5 | — | SE 4 | — | — | — | — | — |
4 | 10 | 1 | — | 1 | — | — | — | 15 | 46 | 58 | 41 | — | 28 | — | 12 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 43 | 19 | 0 | 4 | 11 | 0 | 0 | 19 | 19 | 285 | 285 | 43 | 43 | 475 | 14 | 43 | 581 | 6 | 19 | 997 | 2 |
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.











