
Surf Forecasts:
Asakawa surf forecast from 10 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 3AM (local time) - 3.5ft (1.0m), 11s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 12PM (local time) - 4ft (1.2m), 10s period, E swell with 262 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 3AM (local time) - 3.5ft (1.0m), 11s 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 Tuesday (Aug 11) at 3AM. The primary swell is predicted to be 1.0m and 11s period with a secondary swell of 0.5m and 12s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.2m 10s and forecast to arrive on Monday (Aug 17) at 12PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Tuesday (Aug 11) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 11th Aug) | 3.5ft (1.0m) 11s |
| Best Surf | 3AM (Tue 11th Aug) | 3.5ft (1.0m) 11s |
| Most Powerful | 12PM (Mon 17th Aug) | 4ft (1.2m) 10s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s have a yarn about Asakawa. It’s been a bit quiet, but there’s a couple of windows that’ll get the stoke going.
The surf kicks off on Tuesday 11th August. Tuesday morning you’ve got 3ft of south swell wrapping in, with a 10-second period and a decent 307 of energy pushing through. The wind is NNE at 9 mph, so it’s cross-off and the waves will be clean. That’s your best bet for the first week. It’s a point break and it’s inconsistent, so don’t expect a set every minute, but when they come, they’ll be worth the wait. Crowds are possible here sometimes, so keep an eye out. Tuesday afternoon drops a touch to 3ft, still clean, but the energy dips a bit.
From Wednesday 12th through to Monday 18th August, it’s mostly ordinary. The swell hangs around 2ft to 3ft, but the wind swings onshore or cross-onshore and the quality goes down the drain. There are a few glassy windows on Saturday 15th morning and again on Monday 17th morning, with 2ft swell and clean conditions, but the energy is weak — only around 160 to 172. You could get a few fun ones, but it’s nothing to write home about.
There’s a little gap of quiet, then Thursday 20th August sees a jump in size — 5ft from the SSE with 9-second period and energy hitting 400. But the wind is cross-onshore and the surf is messy, so it’s marginal at best.
Now here’s where it gets interesting. Friday 21st August morning delivers the standout of the whole outlook. You’ve got 4ft of south swell, 9-second period, and 270 of energy. The wind is glassy — absolute zero — from the ESE at 3 mph. That’s clean conditions, and for Asakawa, that’s the pick. The waves will be clean and the point will hold that south swell nicely.
After that, Saturday 22nd morning has glassy conditions again with 3ft of south swell, and Tuesday 25th August morning brings a bigger, long-period pulse: 4ft from the SE with a 13-second period and 693 of energy. It’s a bit cross-onshore, so not pristine, but there’s power there. By Wednesday 26th August morning, it cleans right up again — glassy winds and 4ft of ESE swell at 11 seconds, 473 of energy. That’s another ripper session to look forward to.
Overall, the best on offer is Friday 21st August morning with clean 4ft south swell. The second standout is Wednesday 26th August morning with glassy conditions and solid energy. The water temperature is about average for this time of year, no big anomaly to note.
Stay keen, and get out there when it’s clean. Asakawa doesn’t fire often, but when it does, it’s a gem.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Thu morning. Warm (max 30°C on Tue morning, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Thu night. Warm (max 30°C on Sat afternoon, min 23°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | ||||||||||||||
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 | SSW 10 | SSW 10 | SSW 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 8 | S 10 | S 9 | S 10 | S 9 | S 9 | ESE 6 |
Wave Graph | |||||||||||||||||||
216 | 216 | 173 | 173 | 92 | 87 | 125 | 88 | 86 | 81 | 78 | 56 | 71 | 90 | 83 | 122 | 81 | 59 | 58 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | cross-on | on | glassy | cross-on | on | glassy | on | on | glassy | glassy | on | glassy | on | cross-on | glassy |
High Tide | 3:52AM1.69m | 5:51PM1.75m | 4:49AM1.80m | 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 | |||||||
Low Tide | 10:33PM1.05m | 10:55AM0.05m | 11:18PM0.92m | 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 | ||||||
— | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | |
6:54 | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:47 | — | |
mm | — | — | — | — | 1 | 2 | 6 | 5 | 1 | 1 | — | 1 | — | — | — | — | — | 2 | 1 |
Temp °C | 27 | 30 | 30 | 25 | 27 | 27 | 24 | 27 | 28 | 24 | 28 | 28 | 25 | 29 | 30 | 25 | 30 | 29 | 26 |
Feels °C | 30 | 29 | 30 | 27 | 29 | 29 | 28 | 30 | 30 | 27 | 30 | 30 | 29 | 31 | 32 | 28 | 33 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | SSW 10 | SSW 10 | S 9 | S 10 | SSW 10 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 8 | S 10 | S 9 | S 10 | S 9 | S 9 | ESE 6 |
216 | 216 | 173 | 173 | 85 | 87 | 125 | 88 | 86 | 81 | 78 | 56 | 71 | 90 | 83 | 122 | 81 | 59 | 58 | |
Swell 2 Height (m) Direction Period (s) | E 12 | E 11 | E 11 | E 11 | SSW 10 | SSW 10 | E 10 | SE 12 | E 9 | SE 3 | E 9 | ESE 9 | E 10 | E 11 | E 10 | ESE 10 | E 10 | E 10 | S 9 |
101 | 63 | 61 | 35 | 92 | 58 | 8 | 23 | 7 | 3 | 15 | 16 | 16 | 64 | 75 | 77 | 52 | 31 | 54 | |
Swell 3 Height (m) Direction Period (s) | SE 14 | SE 13 | SE 13 | NE 4 | E 10 | E 10 | SE 12 | E 9 | SE 12 | E 10 | SE 11 | SE 11 | SE 11 | SSE 8 | SE 8 | SE 12 | SE 12 | SE 11 | E 10 |
31 | 28 | 7 | 3 | 19 | 8 | 24 | 7 | 22 | 16 | 19 | 19 | 19 | 6 | 9 | 23 | 49 | 46 | 31 | |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 5 | NE 5 | N 4 | NNE 4 | — | SE 4 | ESE 3 | SE 3 | SE 3 | — | — | — | — | — | — | E 5 | ESE 5 | — |
15 | 18 | 42 | 11 | 3 | — | 3 | 2 | 3 | 4 | — | — | — | — | — | — | 27 | 51 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 19 | 19 | 0 | 43 | 19 | 0 | 4 | 11 | 0 | 0 | 11 | 0 | 4 | 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.











