Surf Forecasts:
Asakawa surf forecast from 12 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 6PM (local time) - 2.5ft (0.7m), 9s period, S swell with glassy winds.
- Most powerful swell: Monday 17 Aug, 3AM (local time) - 3.5ft (1.0m), 10s period, ESE swell with 183 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 6PM (local time) - 2.5ft (0.7m), 9s 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 Wednesday (Aug 12) at 6PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.5m and 10s. Another secondary swell of 0.3m and 2s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.0m 10s and forecast to arrive on Monday (Aug 17) at 3AM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Wed 12th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 6PM (Wed 12th Aug) | 2.5ft (0.7m) 9s |
| Most Powerful | 3AM (Mon 17th Aug) | 3.5ft (1.0m) 10s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s on the table at Asakawa over the next couple of weeks.
Straight up, it’s a pretty bleak run for Asakawa. We’re looking at a whole lot of small, messy days with very little to get excited about. The water’s sitting at 84°, which is a touch warmer than usual for this time of year.
We start with the first real chance on Wednesday morning, the 12th of August. There's a 2ft groundswell from the SSW with a 10-second period, and the best part is the wind is dead calm – glassy conditions. That’s about the only bright spot. The energy is weak (199), and it’s real inconsistent here. It’s a small wave, but it’ll be clean.
After that morning, the wheels fall off. From Wednesday afternoon all the way through the rest of the week, it’s a mess. Afternoon winds swing onshore, we get rain and thunderstorms, and the waves stay tiny. The morning of the 15th (Saturday) offers another brief window of glassy conditions with a 2ft SSW swell, but again, it’s weak and ordinary.
Sunday the 16th sees a bump in energy to moderate (254) with a 3ft swell, but the wind is cross-onshore, killing any quality. That trend continues – a few pulses of swell, but always with the wrong wind.
The most notable event, if you can call it that, is on Friday the 21st of August. The swell jumps to 5ft in the morning, then 7ft in the afternoon, both from the SSW. The energy gets strong, hitting 922 in the afternoon. But with a cross and cross-on wind, and short 8-second period, it’s not going to be clean. For experts only if it gets properly dumpy, but honestly, with that wind and short period, it looks more like a kite-surfing setup than a paddle-surfing one.
We get a couple of glassy mornings on the 22nd and 23rd, but the swell drops right back down to around 4ft to 3ft. It’s surfable, but nothing special. After that, it’s back to small, weak, and onshore conditions through the end of the outlook.
So, the only standout is the very first session – Wednesday morning, the 12th. Tiny but clean. The later pulse on Friday the 21st is the biggest swell, but the conditions are poor. That’s all she wrote for Asakawa this time.
Rusty.
Short Range ForecastHeavy rain (total 32mm), heaviest during Thu morning. Warm (max 28°C on Wed morning, min 24°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 26mm), heaviest during Sat night. Warm (max 29°C on Sat morning, min 24°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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) | S 10 | S 10 | S 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 11 | S 10 | S 9 | S 9 | ESE 9 | S 9 | ESE 6 | ESE 10 | S 9 | ESE 9 | SE 11 | SE 10 | SE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 92 | 87 | 83 | 88 | 86 | 79 | 73 | 73 | 114 | 94 | 81 | 78 | 147 | 64 | 52 | 135 | 41 | 75 | 32 | 28 | 49 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | glassy | cross-on | on | glassy | cross-on | on | glassy | glassy | on | glassy | cross-on | on | on | on | on | cross | glassy | cross-on | cross |
High Tide | 6:24PM1.81m | 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 | 11:39AM-0.00m | 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 | ||||||||
 | |  |  | |  | | | |  | | | |  | | | |  | | | | |
 | 5:20 | — | — | 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 | 1 | 3 | 5 | 11 | 4 | 3 | 2 | 2 | 1 | — | 2 | 12 | 3 | — | 7 | 2 | — | — | — | — | — |
Temp °C | 28 | 27 | 25 | 26 | 26 | 25 | 28 | 28 | 25 | 29 | 29 | 25 | 27 | 28 | 26 | 27 | 28 | 25 | 30 | 29 | 26 |
Feels °C | 31 | 30 | 30 | 29 | 29 | 29 | 31 | 31 | 30 | 32 | 32 | 29 | 30 | 30 | 31 | 30 | 31 | 29 | 33 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | S 9 | SSW 9 | ESE 5 | S 9 | S 9 | S 9 | S 11 | S 10 | S 9 | S 9 | S 8 | S 9 | S 8 | S 8 | S 9 | ESE 5 | ESE 9 | ESE 8 | SE 10 |
| kJ | 88 | 87 | 83 | 88 | 24 | 79 | 73 | 73 | 114 | 94 | 81 | 78 | 52 | 57 | 52 | 36 | 38 | 15 | 32 | 28 | 49 |
Swell 2 Height (m) Direction Period (s) | SSW 10 | SSW 10 | ESE 4 | SE 12 | SSW 9 | ESE 5 | ESE 4 | ESE 9 | ESE 5 | E 9 | ESE 9 | ESE 10 | SE 12 | E 9 | E 10 | SE 11 | E 10 | SSW 8 | SSW 8 | SSW 8 | ESE 6 |
| kJ | 92 | 58 | 5 | 23 | 86 | 14 | 4 | 29 | 11 | 43 | 45 | 31 | 49 | 64 | 49 | 42 | 30 | 23 | 22 | 20 | 12 |
Swell 3 Height (m) Direction Period (s) | E 10 | E 10 | SW 10 | E 10 | E 9 | E 10 | E 9 | SE 11 | E 9 | SE 10 | SE 8 | SE 12 | E 18 | SE 11 | SE 11 | — | SE 11 | E 9 | SE 11 | SE 10 | SSW 8 |
| kJ | 19 | 8 | 26 | 7 | 7 | 16 | 15 | 19 | 27 | 17 | 17 | 22 | 6 | 44 | 42 | — | 41 | 27 | 29 | 28 | 12 |
Wind waves Height (m) Direction Period (s) | — | — | — | E 4 | — | — | SE 4 | SE 4 | — | — | ESE 5 | ESE 5 | ESE 9 | ESE 5 | ESE 6 | ESE 10 | ESE 5 | ESE 9 | — | ESE 6 | — |
| kJ | — | — | — | 6 | — | — | 4 | 3 | — | — | 9 | 71 | 147 | 49 | 49 | 135 | 39 | 75 | — | 12 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 19 | 0 | 43 | 14 | 0 | 19 | 11 | 0 | 0 | 19 | 0 | 43 | 43 | 6 | 19 | 11 | 2 | 0 | 11 | 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.
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