Surf Forecasts:
Asakawa surf forecast from 19 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 6AM (local time) - 13ft (4.0m), 17s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 9AM (local time) - 13ft (4.0m), 17s period, SSE swell with 9,707 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 3AM (local time) - 3ft (0.9m), 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 Friday (Aug 21) at 3AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.4m and 11s. 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 17s and forecast to arrive on Wednesday (Aug 26) at 9AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 3s period and expected on Sunday (Aug 23) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 21st Aug) | 3ft (0.9m) 9s |
| Best Surf | 6AM (Wed 26th Aug) | 13ft (4.0m) 17s |
| Most Powerful | 9AM (Wed 26th Aug) | 13ft (4.0m) 17s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about the outlook for the next couple of weeks.
Right now, the start is a bit of a dud. We’ve got weak, small waves and poor conditions for the first few days, nothing worth paddling out for. You’re looking at a gap from now until the morning of Monday, 24 August. That’s when things finally get interesting.
The standout session is Monday morning, 24 August. Asakawa cleans up with glassy conditions and a light offshore breeze. The swell comes in at 3.6 ft from the SE with a very long 16-second period — proper groundswell with serious energy. The combined energy of all swells directed here is substantial (745). This long-period swell will wrap nicely around the point, giving clean, well-shaped waves. Keep in mind that long-period swell can make beach breaks close out, but this is a point break, so it should handle it beautifully. The water temperature is 82.8°, about average for this time of year.
Later that afternoon, the wind gets onshore, so the morning window is the one to chase. On Tuesday, 25 August, the swell builds to 7.5 ft to 8.2 ft, but the cross-onshore wind makes things a bit messy. It’s a big swell and still surfable if you’re keen on the power. By Wednesday the 26th, we’re into serious territory — 13.1 ft swell from the SSE, but with light rain and cross-offshore winds in the afternoon making it clean. The energy is huge (7186), so this is for experienced surfers only. Thursday the 27th morning is another top pick: 14.8 ft swell from the ESE with clean, cross-offshore winds and exceptional conditions for experts. After that, the swell stays solid but the wind turns onshore or cross, keeping things messy but still offering plenty of size into the first week of September.
Overall, the real gold is on the Monday and Thursday early sessions. If you’re not an expert, stick to the smaller mornings, especially the 24th. That’s the one that’s hard to beat.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed afternoon. Warm (max 30°C on Thu morning, min 25°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Sat afternoon. Warm (max 30°C on Sun morning, min 25°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Wed 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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) | ESE 8 | SE 10 | SE 10 | SE 10 | S 9 | S 9 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 9 | SE 16 | SE 15 | SE 14 | SE 15 | SE 16 | SSE 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 51 | 25 | 25 | 25 | 126 | 127 | 145 | 103 | 113 | 108 | 116 | 135 | 137 | 99 | 574 | 677 | 1067 | 2203 | 3079 | 5155 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | glassy | on | cross | glassy | cross-on | cross | glassy | cross-on | cross | glassy | cross-on | cross-on | glassy | on | glassy | cross-on | cross-on | off |
High Tide | 9:25PM1.57m | 11:17AM1.25m | 9:52PM1.48m | 2:05PM1.21m | 10:36PM1.39m | 4:20PM1.32m | 00:36AM1.34m | 4:43PM1.42m | 2:31AM1.38m | 5:04PM1.52m | 3:35AM1.49m | 5:25PM1.60m | ||||||||
Low Tide | 3:19PM0.92m | 4:31AM0.59m | 3:42PM1.07m | 5:42AM0.66m | 4:07PM1.20m | 7:28AM0.66m | 8:19PM1.26m | 8:57AM0.58m | 9:51PM1.18m | 9:51AM0.47m | 10:27PM1.07m | 10:31AM0.36m | 10:55PM0.96m | |||||||
 |  |  | | |  | | | | | | | | | | | | | |  | |
 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — |
 | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — |
mm | 1 | — | — | — | — | — | 1 | — | — | 1 | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 28 | 26 | 30 | 29 | 26 | 30 | 29 | 26 | 30 | 29 | 27 | 30 | 30 | 26 | 30 | 29 | 26 | 30 | 30 | 26 |
Feels °C | 32 | 31 | 34 | 32 | 30 | 33 | 33 | 30 | 34 | 33 | 32 | 33 | 33 | 31 | 33 | 32 | 31 | 34 | 34 | 31 |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 7 | SE 10 | S 8 | S 9 | S 9 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 9 | SE 16 | SE 15 | SE 14 | SE 15 | SE 16 | SSE 16 |
| kJ | 51 | 20 | 25 | 21 | 126 | 127 | 145 | 103 | 113 | 108 | 116 | 135 | 137 | 98 | 574 | 677 | 1067 | 2203 | 3079 | 5155 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | ESE 7 | SE 10 | SE 10 | ESE 11 | ESE 11 | SE 11 | ESE 10 | SE 10 | SE 12 | ESE 11 | SE 13 | ESE 12 | SSW 10 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | E 14 |
| kJ | 26 | 25 | 9 | 25 | 28 | 44 | 44 | 29 | 43 | 26 | 39 | 38 | 45 | 99 | 97 | 133 | 77 | 56 | 36 | 32 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SSW 8 | S 8 | SE 7 | ESE 7 | ESE 7 | ESE 6 | ESE 7 | SE 9 | ESE 13 | E 9 | ESE 6 | ESE 11 | SSE 10 | E 12 | E 16 | E 12 | E 15 | E 14 | SSW 9 |
| kJ | 11 | 6 | 12 | 11 | 9 | 4 | 4 | 5 | 3 | 17 | 7 | 4 | 23 | 9 | 74 | 5 | 44 | 17 | 16 | 16 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | SW 3 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 11 | 2 | 6 | 30 | 2 | 0 | 11 | 2 | 0 | 19 | 1 | 0 | 11 | 2 | 0 | 11 | 0 | 19 | 43 | 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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