Surf Forecasts:
Asakawa surf forecast from 16 Aug 2026:
- Best quality surf: Friday 21 Aug, 6AM (local time) - 3.5ft (1.0m), 11s period, S swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 9AM (local time) - 5.5ft (1.7m), 17s period, SE swell with 1,690 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 12AM (local time) - 2.5ft (0.7m), 9s period with SE 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 18) at 12AM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.4m and 8s. Another secondary swell of 0.8m and 4s 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 1.7m 17s and forecast to arrive on Monday (Aug 24) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 18th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 6AM (Fri 21st Aug) | 3.5ft (1.0m) 11s |
| Most Powerful | 9AM (Mon 24th Aug) | 5.5ft (1.7m) 17s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what Asakawa’s got cookin’. We’ve got a long wait ahead, but when it fires, it’s gonna be big.
The first week is a write-off, honestly. From Monday the 17th through to Sunday the 23rd, it’s flat and messy. Light onshore breezes and tiny, weak swell. Not worth paddling out for. The combined wave energy is constantly in the low triple digits and below, like that 124 on Monday the 17th, or even lower. Forget it.
Then things change. Around Monday the 24th, we start seeing some life. Tuesday the 25th is where it gets real interesting. The Tuesday morning session at Asakawa is the standout of the entire run. We’re looking at a solid 7ft groundswell from the southeast, with a very long 16-second period. The wind is dead calm, glassy as a mirror. The combined energy is pumping at 2416, that’s moderate to strong energy. This is proper, powerful gear. At that size it’s in the intermediate to expert zone, but with those conditions it’ll be worth it. This break is a point break, so that long-period swell will line up nicely. Just be aware it’s an inconsistent spot and crowds are sometimes a problem.
The water temp is about average for the time of year, nothing unusual to report.
Later that Tuesday the 25th afternoon gets a bit bigger at 8ft from the southeast, still long period, but with an onshore wind creeping in. Not as clean.
Wednesday the 26th morning is another cracker. Still big, 8ft from the south-southeast, 16-second period, and a cross-offshore breeze from the northeast at 6 mph. Clean conditions and a combined energy of 3814. This stuff is serious. It’s only for experienced surfers at this size.
From Thursday the 27th through to the 29th, the swell keeps building, hitting 13ft. The wind turns messy, especially Friday the 28th with a howling easterly gale at 40 mph – that’s flat-out dangerous and not surfable.
There is one more highlight on Sunday the 30th morning. The swell drops back to a cleaner 6ft from the east-southeast, still a 16-second period, with a nice cross-off breeze from the northeast. Quality waves for experienced folks in the moderate energy range of 4052.
So, to sum it up: the first week is a total blank. Don’t even bother. The real action, the standout, is Tuesday the 25th morning with that glassy, long-period 7ft southeast groundswell. Wednesday the 26th morning and Sunday the 30th morning are also very promising days, but nothing tops that Tuesday glass-off.
Rusty out.
Short Range ForecastLight rain (total 8mm), mostly falling on Mon night. Warm (max 29°C on Mon afternoon, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Thu afternoon. Warm (max 29°C on Fri afternoon, min 25°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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) | SE 5 | SE 11 | SE 9 | SE 11 | SE 10 | SE 10 | ESE 8 | SE 10 | SE 10 | E 7 | S 9 | ESE 11 | S 10 | S 10 | S 10 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SE 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 47 | 30 | 79 | 29 | 28 | 27 | 71 | 27 | 25 | 45 | 52 | 86 | 264 | 284 | 290 | 235 | 180 | 153 | 110 | 94 | 322 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | on | on | cross-on | cross-on | on | glassy | cross-on | on | glassy | on | on | glassy | on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 8:38PM1.72m | 9:14AM1.51m | 9:01PM1.65m | 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 | ||||||||
Low Tide | 2:29PM0.58m | 3:02AM0.48m | 2:55PM0.76m | 3:42AM0.53m | 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 | ||||||||
 |  |  |  | |  |  | |  | | | | | | | | |  | | | | |
 | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — |
 | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:40 | — | — | 6:39 | — |
mm | 2 | — | 4 | 1 | — | — | — | — | 1 | 2 | 6 | 1 | 1 | — | — | 1 | — | — | 2 | 1 | — |
Temp °C | 28 | 29 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 29 | 26 | 29 | 29 | 26 | 28 | 29 | 26 |
Feels °C | 30 | 32 | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 33 | 33 | 31 | 32 | 33 | 31 | 32 | 32 | 30 | 30 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 8 | SE 5 | SE 9 | SE 11 | SE 5 | SE 5 | ESE 8 | ESE 8 | ESE 5 | ESE 7 | S 9 | S 8 | S 10 | S 10 | S 10 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SE 14 |
| kJ | 22 | 30 | 79 | 29 | 23 | 23 | 71 | 19 | 24 | 25 | 52 | 86 | 264 | 284 | 290 | 235 | 180 | 153 | 110 | 94 | 322 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SSW 8 | SSW 8 | SSW 8 | ESE 8 | ESE 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 4 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | ESE 10 | ESE 10 | ESE 11 | ESE 11 | SSW 9 |
| kJ | 42 | 21 | 20 | 11 | 22 | 23 | 26 | 26 | 25 | 25 | 25 | 7 | 44 | 44 | 44 | 42 | 42 | 21 | 37 | 22 | 84 |
Swell 3 Height (m) Direction Period (s) | ESE 9 | SE 11 | SE 11 | — | SE 10 | SE 10 | SSW 8 | SSW 8 | E 7 | S 9 | — | SE 10 | ESE 6 | E 8 | E 14 | ESE 7 | ESE 7 | ESE 6 | SSE 10 | SE 13 | S 10 |
| kJ | 28 | 30 | 30 | — | 28 | 27 | 11 | 11 | 4 | 25 | — | 28 | 7 | 23 | 4 | 10 | 10 | 4 | 9 | 46 | 2 |
Wind waves Height (m) Direction Period (s) | SE 5 | — | SE 4 | SE 4 | — | — | — | SE 5 | — | E 7 | ESE 5 | ESE 11 | — | — | — | — | — | — | — | — | — |
| kJ | 47 | — | 21 | 21 | — | — | — | 27 | — | 45 | 13 | 75 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 19 | 43 | 19 | 0 | 43 | 475 | 1 | 19 | 522 | 2 | 19 | 11 | 11 | 19 | 11 | 2 | 11 | 14 | 2 | 2 | 2 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Asakawa surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest