Surf Forecasts:
Asakawa surf forecast from 19 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 12AM (local time) - 10ft (3.0m), 16s period, SSE swell with glassy winds.
- Most powerful swell: Wednesday 26 Aug, 3PM (local time) - 15ft (4.5m), 17s period, SSE swell with 10,499 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 4.5m 17s and forecast to arrive on Wednesday (Aug 26) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 21st Aug) | 3ft (0.9m) 9s |
| Best Surf | 12AM (Wed 26th Aug) | 10ft (3.0m) 16s |
| Most Powerful | 3PM (Wed 26th Aug) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, mates, Rusty here. Let’s have a look at what’s on the cards for our stretch of coast over the next couple of weeks. It’s a bit of a slow burner, but there’s some serious size lurking out there for those who can handle it.
The next few days are pretty flat, to be honest. We've got a few small pulses of energy through Thursday and Friday, but they're weak. The swell energy is down in the double digits, which just isn't enough to get anything going properly. You’ll see some lines on the 21st and 22nd, but it's small – around 3ft with a short 9-second period. The south-east wind will be light in the mornings, but it swings onshore in the afternoon, chopping things up. It's not worth getting too excited about yet.
There’s a bit more push on Sunday the 24th, as the energy starts to build, but the swell is still pretty weak and the wind is on it, so it's going to be messy and hard to read. We're really waiting for the main event.
And that event looks like it's shaping up for Tuesday the 25th. This is where things get serious. The swell jumps to 8ft early with a long, 16-second period, and the energy reading is strong. The wind is light offshore and glassy early, which is going to make it clean. This is a proper groundswell, and it's coming from the SE. This will be big and powerful, so it's not for the faint of heart. If you’re an experienced surfer, this is your window. The afternoon sees it bump up to 8ft, but the wind comes onshore, so get on it early.
The swell keeps building through Wednesday the 26th, but the wind starts to turn against us. We're looking at 11-15ft of SE swell with a 17-second period, but with a cross-shore breeze and some rain around. The energy is massive. This is a lot of water moving around, and the quality is going to suffer. It might be more interesting for the kite crew than for us paddle surfers.
By the 27th, things get properly wild and ugly. The swell peaks at 18ft, but with a strong cross-onshore wind and rain, it’s going to be a washing machine. There's no way you want to be out there. The conditions stay rough and stormy through the 28th and 29th, with more rain and strong winds. The swell is still big, but it's a total mess. This is not a time for a surf.
After that storm blows through, things finally start to clean up. By Monday the 31st, the swell has settled to a still-chunky 7ft with a 14-second period and the wind is a light cross-offshore. The energy is still solid. This looks like a much better proposition. Glassy conditions return on Monday afternoon and into Tuesday the 1st, but the swell has jumped back up to 11ft. That’s big, make no mistake. But with no wind and that long period, the point should be handling it well.
As we move into the first week of September the pattern is looking promising, but as always with these longer-range forecasts, we’ll have to see how it plays out. We’re looking at solid 10-11ft swells early in the week, with clean, offshore winds. Wednesday the 2nd and Thursday the 3rd are looking like the pick of the second week. The swell comes down a touch to that 7ft range, but the wind is offshore and the energy is still strong. This will be proper, clean, lined-up surf. It’s a promising long-range call, but don’t book your flights just yet.
So, the standout days are Tuesday the 25th for the big and powerful early session, and then the 31st and 3rd of September for the cleaner, more manageable swells with offshore winds.
Rusty out.
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 4-6 Weather SummarySome drizzle, heaviest during Sat afternoon. Warm (max 30°C on Sat morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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) | ESE 8 | ESE 8 | SE 10 | SE 10 | SE 10 | S 9 | S 9 | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 11 | SE 13 | SE 15 | SE 16 | SE 16 | SE 15 | SSE 16 |
Wave Graph | |||||||||||||||||||||
56 | 51 | 25 | 25 | 25 | 99 | 127 | 148 | 108 | 110 | 106 | 92 | 92 | 96 | 143 | 202 | 472 | 1571 | 2653 | 2721 | 4422 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | glassy | on | cross | glassy | on | cross | glassy | cross-on | cross | on | cross-on | cross | on | on | glassy | glassy | on | glassy |
High Tide | 10:05AM1.37m | 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 | — | — | 5:26 | — | — | 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 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 28 | 26 | 30 | 29 | 26 | 30 | 29 | 26 | 30 | 30 | 26 | 30 | 30 | 26 | 30 | 29 | 26 | 29 | 30 | 26 |
Feels °C | 33 | 32 | 31 | 33 | 33 | 31 | 33 | 32 | 30 | 33 | 34 | 30 | 33 | 33 | 31 | 33 | 32 | 31 | 32 | 33 | 30 |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 8 | ESE 7 | SE 10 | S 8 | S 9 | S 9 | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 11 | SSW 10 | SE 15 | SE 16 | SE 16 | SE 15 | SSE 16 |
56 | 51 | 20 | 25 | 22 | 99 | 127 | 148 | 108 | 110 | 106 | 92 | 92 | 96 | 143 | 121 | 472 | 1571 | 2653 | 2721 | 4422 | |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 7 | SE 10 | SE 10 | ESE 11 | ESE 11 | SE 11 | ESE 10 | SE 10 | ESE 10 | ESE 11 | ESE 11 | SE 12 | SE 13 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SW 10 |
26 | 26 | 25 | 11 | 25 | 28 | 44 | 44 | 29 | 41 | 17 | 10 | 39 | 23 | 118 | 202 | 128 | 88 | 78 | 82 | 24 | |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SSW 8 | SSW 8 | S 8 | SE 7 | ESE 7 | ESE 7 | ESE 6 | ESE 6 | ESE 6 | E 10 | ESE 13 | SSE 10 | SSE 10 | ESE 5 | SE 16 | SE 18 | E 12 | E 11 | E 12 | E 13 |
11 | 11 | 6 | 12 | 11 | 5 | 4 | 4 | 3 | 4 | 8 | 16 | 9 | 9 | 3 | 91 | 119 | 68 | 10 | 11 | 31 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 2 | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 11 | 2 | 6 | 30 | 2 | 0 | 11 | 2 | 0 | 19 | 2 | 14 | 19 | 2 | 11 | 11 | 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.











