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 glassy winds.
- Most powerful swell: Wednesday 26 Aug, 9AM (local time) - 13ft (4.0m), 17s period, SSE swell with 10,349 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 9PM (local time) - 1.5ft (0.4m), 10s 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 Wednesday (Aug 19) at 9PM. The primary swell is predicted to be 0.5m and 7s period with a secondary swell of 0.4m and 10s. 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.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 19th Aug) | 1.5ft (0.4m) 10s |
| 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 again. Let’s break down the same forecast for Asakawa (point), but in the old school numbers.
The start of this run is pretty quiet. From the 19th through the 24th, we’re looking at small surf, mostly knee-high or less, with swell under three feet. Combined energy readings are all on the lower side, between 55 and 263. Some mornings are glassy and clean, like the 21st, 22nd, 23rd, and 24th, but the waves are just ordinary. The water temperature is around 83°F, which is pretty normal for this time of year.
Tuesday the 25th is when things start to wake up. We get a solid 7ft swell from the SE with a very long period of 16 seconds. The combined energy jumps to a strong 2312. It’s getting too big for beginners. The morning has a cross-on breeze, so it’s not totally clean.
The real gold is Wednesday the 26th of August. Swell is a proper 13ft in the morning, building to nearly 15ft by the afternoon, from the SSE with a period of 16-17 seconds. The combined energy is enormous – 10407 and then 11041. That’s a massive, long-period groundswell. This is for experts only. Light wind in the morning will make for some incredible, heavy waves at this point break.
Thursday the 27th is still huge, with an 18ft morning swell (10515 combined energy) and a clean, cross-offshore wind. That’s prime big-wave territory. It drops to 13ft in the afternoon but stays clean. Friday the 28th morning is still solid, with 12ft swell and glassy conditions.
From the 29th onward, the swell fades and the wind turns ugly, bringing poor conditions through the end of August and into September. There’s a small, glassy window on the 2nd of September with 5ft swell and clean, offshore wind for a more manageable session.
So, to put it simply: the first week is small and nothing special. The absolute best days are the 26th and 27th of August for big, clean, powerful surf – expert only. The 25th is the build, the 28th is the leftover, and the 2nd of September offers a smaller but clean option.
That’s the long and short of it.
Rusty
Short Range ForecastLight rain (total 7mm), 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 Mon afternoon. Warm (max 30°C on Sat morning, min 24°C on Mon 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 10 | SSW 9 | SSW 11 | SSW 10 | SSW 11 | SE 16 | SE 14 | SE 16 | SSE 17 | SSE 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 56 | 51 | 29 | 25 | 34 | 99 | 127 | 145 | 110 | 110 | 106 | 179 | 121 | 84 | 157 | 186 | 352 | 833 | 2185 | 1480 | 5286 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross | glassy | on | cross | glassy | cross-on | cross | glassy | on | cross | glassy | on | cross | glassy | on | glassy | cross-on | 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 | 2 | 2 | — | — | 1 | — | — | 2 | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 28 | 28 | 26 | 30 | 29 | 26 | 29 | 28 | 26 | 30 | 30 | 26 | 30 | 30 | 26 | 30 | 29 | 26 | 30 | 30 | 25 |
Feels °C | 32 | 33 | 31 | 33 | 33 | 31 | 32 | 32 | 30 | 33 | 33 | 30 | 34 | 33 | 31 | 33 | 32 | 31 | 33 | 33 | 28 |
Swell 1 Height (m) Direction Period (s) | SE 10 | ESE 8 | ESE 7 | ESE 7 | S 8 | S 9 | S 9 | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 9 | SSW 9 | SSW 10 | SSW 11 | SSW 11 | SE 14 | SE 16 | SE 14 | SSE 16 |
| kJ | 26 | 51 | 29 | 18 | 34 | 99 | 127 | 145 | 110 | 110 | 106 | 179 | 121 | 71 | 157 | 186 | 180 | 833 | 2185 | 1480 | 5286 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 11 | ESE 11 | SE 11 | ESE 10 | SE 10 | ESE 10 | ESE 11 | SSW 11 | ESE 11 | SE 10 | SE 16 | SSW 10 | SSW 10 | SSE 17 | SSW 10 |
| kJ | 11 | 26 | 25 | 25 | 25 | 28 | 44 | 44 | 29 | 41 | 17 | 10 | 46 | 84 | 47 | 48 | 352 | 118 | 123 | 1340 | 38 |
Swell 3 Height (m) Direction Period (s) | SW 9 | SSW 8 | SSW 7 | S 8 | ESE 7 | ESE 7 | ESE 7 | ESE 6 | ESE 6 | ESE 6 | E 10 | ESE 13 | SSE 9 | SE 11 | SE 11 | ESE 12 | SE 12 | E 12 | E 15 | SSW 10 | E 13 |
| kJ | 3 | 11 | 5 | 12 | 9 | 9 | 4 | 4 | 4 | 4 | 8 | 16 | 8 | 30 | 18 | 29 | 110 | 11 | 4 | 92 | 32 |
Wind waves Height (m) Direction Period (s) | ESE 8 | SE 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 56 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 11 | 2 | 1 | 11 | 2 | 0 | 11 | 2 | 0 | 19 | 2 | 0 | 30 | 2 | 0 | 11 | 0 | 285 | 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.
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