Surf Forecasts:
Asakawa surf forecast from 22 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 12AM (local time) - 10ft (3.0m), 16s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 3PM (local time) - 13ft (4.0m), 15s period, SSE swell with 6,945 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 3AM (local time) - 2ft (0.6m), 8s 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 Sunday (Aug 23) at 3AM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.4m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 4.0m 15s and forecast to arrive on Tuesday (Aug 25) at 3PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sun 23rd Aug) | 2ft (0.6m) 8s |
| Best Surf | 12AM (Tue 25th Aug) | 10ft (3.0m) 16s |
| Most Powerful | 3PM (Tue 25th Aug) | 13ft (4.0m) 15s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let’s talk about the only spot on offer for this 16-day window: Asakawa. It’s a point break, and that’s a good thing – points hold swell well when the planets align.
Right now, it’s pretty quiet. Saturday the 22nd has tiny 3ft SSW swell rolling in with glassy conditions in the morning, but the wave energy is weak (155). Surfable, just not worth rushing for. By afternoon the wind turns onshore and it gets sloppy.
Sunday the 23rd is a total washout – small, poor wind, just leave the board in the car.
Then things start to wake up. Monday the 24th is where the first real standout shows. Early morning brings a clean 4ft SE groundswell with an 18-second period – that’s long-period energy, proper push. Combined energy is a solid moderate (1133), the wind is glassy, and the water temp is 83°, about average for this time of year. The swell direction is SE, which works great for this break. This is the best morning session of the first week. Not huge, but the quality will be there. The afternoon gets tricky with onshore wind and the swell jumping up, so get out early.
Tuesday the 25th and Wednesday the 26th see the swell building – 10ft on Tuesday morning, up to 13ft in the afternoon. That’s serious size, only for the experienced crew. Wind is cross-onshore or onshore though, so it’s not clean. Energy is very strong (5922 to 6961) but the quality is marginal. Save those days for if you’re a tough charger.
Thursday the 27th and Friday the 28th mornings bring a nice drop – around 6ft to 8ft – with glassy conditions again. Thursday has short-period SSE swell, but Friday has a longer 11-second S swell with strong energy (1206). The water is still warm. These are clean, solid point break days, but remember this spot is inconsistent and rarely breaks, so when it’s on, it’s special. Crowds can show up, so expect some company.
From Saturday the 29th through to the start of September, it’s a poor run – small choppy swell, onshore wind, and weak energy. There’s a 5-6 day gap here with nothing worth paddling for.
The next real blip is on Thursday the 3rd of September. The swell pumps to 16ft SE with a 12-second period, very strong energy (6518). But the wind is onshore, making it messy and dangerous. That size is for experts only, and even then, the conditions aren’t great. It might be more interesting for kite surfing than paddle surfing.
Then we get a nice little window to close things out. Friday the 4th of September morning brings 12ft SE swell with light offshore NE wind and clean conditions. This is for experienced surfers, but the quality is excellent. Saturday the 5th and Sunday the 6th mornings also look clean with cross-offshore winds and solid 6ft to 7ft SE groundswell. Energy remains strong (1001-1233). These are good, rideable days with decent shape.
Overall, the best bets are the glassy morning of Monday the 24th August for clean, modest waves, and the cleaner windows from Thursday the 27th to Friday the 28th August. For the second week, keep an eye on Friday the 4th and the weekend mornings – promising but less certain this far out.
Stay stoked, and pick your windows.
- Rusty
Short Range ForecastLight rain (total 4mm), mostly falling on Sat afternoon. Warm (max 31°C on Sat morning, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Wed night. Warm (max 30°C on Tue morning, min 26°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | |||||||||||||||
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 | SSW 8 | SSW 8 | SE 13 | SE 12 | SE 18 | SE 17 | SSE 16 | SSE 14 | SSE 15 | S 14 | S 13 | S 12 | S 11 | SSE 9 | S 10 | S 10 | S 11 | S 10 | S 9 |
Wave Graph | |||||||||||||||||||||
108 | 80 | 55 | 54 | 45 | 152 | 1099 | 2810 | 5238 | 3095 | 6945 | 5127 | 3035 | 1415 | 584 | 567 | 830 | 890 | 1190 | 761 | 356 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | cross-on | on | cross | glassy | on | glassy | cross-on | on | glassy | cross-on | cross-on | glassy | glassy | glassy | glassy | glassy | on | glassy |
High Tide | 4:20PM1.32m | 00:36AM1.34m | 4:43PM1.42m | 2:31AM1.38m | 5:04PM1.52m | 3:35AM1.49m | 5:25PM1.60m | 4:20AM1.60m | 5:47PM1.67m | 4:59AM1.70m | 6:08PM1.73m | 5:36AM1.78m | 6:30PM1.78m | ||||||||
Low Tide | 8:19PM1.26m | 8:57AM0.58m | 9:51PM1.18m | 9:51AM0.47m | 10:27PM1.07m | 10:31AM0.36m | 10:55PM0.96m | 11:05AM0.27m | 11:22PM0.84m | 11:35AM0.21m | 11:50PM0.72m | 12:05PM0.20m | 00:18AM0.60m | ||||||||
5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | |
— | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:34 | — | |
mm | — | 2 | 1 | — | — | — | — | 1 | — | — | — | 2 | 2 | — | 2 | 2 | 3 | 1 | 1 | 2 | 2 |
Temp °C | 31 | 30 | 26 | 31 | 30 | 27 | 30 | 29 | 26 | 30 | 30 | 26 | 29 | 29 | 26 | 28 | 27 | 26 | 29 | 28 | 26 |
Feels °C | 35 | 34 | 30 | 34 | 33 | 32 | 33 | 33 | 31 | 33 | 33 | 32 | 33 | 33 | 31 | 33 | 32 | 31 | 33 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 9 | SSW 8 | SSW 8 | S 8 | SE 12 | SE 18 | SE 17 | SSE 16 | SSE 14 | SSE 15 | S 14 | S 13 | S 12 | S 11 | SSE 9 | S 10 | S 10 | S 11 | S 10 | S 9 |
108 | 80 | 55 | 54 | 30 | 152 | 1099 | 2810 | 5238 | 3095 | 6945 | 5127 | 3035 | 1415 | 584 | 567 | 830 | 890 | 1190 | 761 | 356 | |
Swell 2 Height (m) Direction Period (s) | ESE 10 | SE 10 | ESE 10 | ESE 11 | SE 13 | S 8 | S 8 | S 8 | SSE 18 | SSE 17 | E 14 | E 13 | E 13 | SE 9 | SE 9 | SW 10 | E 11 | E 11 | E 10 | SW 12 | SW 12 |
43 | 17 | 10 | 38 | 45 | 21 | 21 | 31 | 2171 | 2810 | 16 | 32 | 30 | 367 | 321 | 48 | 10 | 9 | 8 | 25 | 6 | |
Swell 3 Height (m) Direction Period (s) | ESE 7 | E 10 | ESE 13 | ESE 6 | ESE 11 | SSW 9 | SW 9 | SW 9 | SW 10 | E 15 | — | — | E 13 | E 13 | E 12 | E 12 | SE 16 | SE 16 | SE 14 | SE 14 | E 13 |
4 | 8 | 16 | 3 | 23 | 30 | 13 | 28 | 23 | 17 | — | — | 121 | 29 | 25 | 11 | 10 | 9 | 8 | 8 | 3 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SE 9 | — | — | — | — | — | — | — | ESE 6 |
— | — | — | — | — | — | — | — | — | — | — | — | 170 | — | — | — | — | — | — | — | 115 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 19 | 2 | 14 | 11 | 2 | 0 | 11 | 0 | 43 | 19 | 0 | 11 | 4 | 0 | 0 | 0 | 0 | 0 | 19 | 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.











