Surf Forecasts:
Asakawa surf forecast from 9 Aug 2026:
- Best quality surf: Sunday 9 Aug, 9PM (local time) - 3.5ft (1.0m), 13s period, E swell with glassy winds.
- Most powerful swell: Sunday 9 Aug, 9PM (local time) - 3.5ft (1.0m), 13s period, E swell with 339 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 9PM (local time) - 3.5ft (1.0m), 13s period with E 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 09) at 9PM. The primary swell is predicted to be 1.0m and 13s period with a secondary swell of 1.0m and 12s. Another secondary swell of 1.0m and 11s 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 13s and forecast to arrive on Sunday (Aug 09) at 9PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Tuesday (Aug 11) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 9th Aug) | 3.5ft (1.0m) 13s |
| Best Surf | 9PM (Sun 9th Aug) | 3.5ft (1.0m) 13s |
| Most Powerful | 9PM (Sun 9th Aug) | 3.5ft (1.0m) 13s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let me run through the next 16 days for Asakawa (point). It starts small and stays that way for a while, so patience is key.
The first real standout appears on Sunday, August 23rd. That morning we’ll see waves around 7 ft from the south with a 12-second period – that's proper groundswell with strong energy (1141). The wind will be glassy from the ESE, dead clean. That’s the session to aim for: a solid south swell, good period, and perfect conditions. Since it’s over 5 ft, it’s better suited for experienced surfers on this point break. The water temp is about 84°, pretty normal for this time of year.
Another good morning comes Monday, August 24th. Waves from the southeast at 6 ft, period of 9 seconds, with very strong combined energy (1212) and glassy SE winds. It’s slightly smaller than Sunday but still clean and punchy. Those two mornings are the clear standouts.
In between, especially around the 13th through the 16th, it gets rough – onshore wind, tiny waves, poor quality. A few days not worth chasing.
Late in the run, on the 22nd, the swell kicks up hard – 6 ft from the south – but the wind is messy, so it won’t be a great look. Stick to the 23rd and 24th mornings.
Since Asakawa is a point break that breaks inconsistently, a long-period south swell wraps in best and holds shape when conditions are clean.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Mon morning. Warm (max 30°C on Mon morning, min 22°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Thu morning. Warm (max 30°C on Sat morning, min 23°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | ||||||||||||||
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 12 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | S 9 | S 9 | SE 10 | S 10 | ESE 10 | S 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 378 | 289 | 242 | 190 | 216 | 216 | 212 | 173 | 173 | 90 | 131 | 90 | 86 | 86 | 81 | 79 | 87 | 94 | 122 | 125 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-off | glassy | off | cross-off | cross-off | off | cross-off | cross-on | glassy | cross | on | glassy | glassy | on | cross-off | glassy | cross-on | cross-off |
High Tide | 4:29PM1.55m | 2:42AM1.58m | 5:14PM1.67m | 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 | |||||||
Low Tide | 9:34PM1.16m | 10:02AM0.17m | 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 | |||||||
 |  |  |  |  |  | |  |  | |  | | | | | |  | | | | |
 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — |
 | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — |
mm | — | — | 1 | 1 | — | — | — | — | — | — | 1 | 4 | 2 | — | 1 | — | 3 | — | 2 | 1 |
Temp °C | 28 | 27 | 30 | 30 | 26 | 30 | 30 | 24 | 25 | 26 | 24 | 26 | 27 | 25 | 29 | 29 | 25 | 30 | 29 | 25 |
Feels °C | 32 | 32 | 33 | 34 | 28 | 29 | 29 | 24 | 28 | 29 | 28 | 29 | 30 | 29 | 31 | 31 | 28 | 33 | 32 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 10 | SSW 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | SE 9 | ESE 10 | S 10 |
| kJ | 378 | 289 | 242 | 190 | 216 | 216 | 212 | 173 | 173 | 67 | 131 | 90 | 86 | 86 | 81 | 79 | 57 | 90 | 122 | 125 |
Swell 2 Height (m) Direction Period (s) | E 13 | ESE 13 | E 12 | E 12 | E 12 | E 11 | E 11 | NE 4 | E 10 | SSW 10 | ESE 5 | SE 12 | SE 12 | ESE 4 | ESE 9 | SE 11 | SE 10 | S 10 | S 9 | ESE 9 |
| kJ | 339 | 286 | 193 | 144 | 101 | 63 | 37 | 9 | 18 | 90 | 8 | 23 | 22 | 6 | 27 | 30 | 87 | 94 | 83 | 69 |
Swell 3 Height (m) Direction Period (s) | S 11 | SSW 11 | SSW 11 | SW 11 | SE 14 | SE 13 | SE 13 | E 10 | SE 13 | E 10 | SE 12 | E 10 | E 9 | E 10 | SE 11 | E 8 | E 11 | E 10 | SE 14 | SE 12 |
| kJ | 181 | 219 | 78 | 55 | 31 | 27 | 27 | 33 | 27 | 19 | 24 | 7 | 7 | 16 | 19 | 13 | 20 | 18 | 8 | 23 |
Wind waves Height (m) Direction Period (s) | — | — | — | NE 3 | NE 4 | NE 5 | NE 5 | N 4 | N 4 | NE 4 | E 5 | E 4 | ESE 4 | — | — | — | — | — | — | — |
| kJ | — | — | — | 3 | 8 | 18 | 49 | 22 | 9 | 5 | 16 | 19 | 21 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 0 | 43 | 0 | 43 | 14 | 0 | 0 | 11 | 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.
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