Surf Forecasts:
Asakawa surf forecast from 25 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 6AM (local time) - 7ft (2.1m), 12s period, S swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 6PM (local time) - 10ft (3.0m), 13s period, SSE swell with 2,986 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 6AM (local time) - 7ft (2.1m), 12s 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 Wednesday (Aug 26) at 6AM. The primary swell is predicted to be 2.1m and 12s period with a secondary swell of 1.0m 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 3.0m 13s and forecast to arrive on Tuesday (Aug 25) at 6PM. 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+) | 6AM (Wed 26th Aug) | 7ft (2.1m) 12s |
| Best Surf | 6AM (Wed 26th Aug) | 7ft (2.1m) 12s |
| Most Powerful | 6PM (Tue 25th Aug) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here with the long-range outlook for Asakawa. This is a point break with a pretty inconsistent reputation, and this forecast is a real mixed bag, so temper those expectations.
The water temperature is sitting at 84°, which is about a degree and a half warmer than average for this time of year, keeping things pretty comfortable.
The first real shot at anything comes on Tuesday the 25th of August, and it's a big one but with a catch. We’ve got a massive pulse of energy hitting the coast, with a combined swell energy of a very strong 4834. The swell is a solid 10ft from the SSE, but it's coming in with a 14-second period. That's a long-period groundswell, which can be a bit tricky at a point break, tending to run straight and making paddling out a mission. To make things worse, the wind is a light cross-onshore from the south, so it's not going to be clean. It's a window for the experts only, but it's not going to be a classic Asakawa day. The afternoon drops to 8ft but the wind stays onshore, so it's a pass.
The next few days are pretty grim. Wednesday the 26th through to the end of the month see dropping swell and persistent onshore or cross-onshore winds, with storm risks and moderate energy readings (down to 68 by the 30th). The surf is small and sloppy, with very few clean windows. There's a brief moment on Friday the 28th morning when the wind goes glassy, but the swell is a weak 4ft with a short 8-second period, producing only 224 of combined energy. It's rideable, but ordinary.
The first week of September gets a bit more interesting but still messy. By the 1st of September, the swell tries to build again, hitting 6ft from the SE by the afternoon, but the wind is an onshore cross-breeze, and the period is a moderate 12 seconds. The combined energy is moderate (1006), but the conditions are poor. The same story continues through the 2nd and 3rd, with stronger winds and clean faces being a rare sight. The swell is there, but it's not surfable.
Now, let's talk about the standout. It's a long way out, so take this with a grain of salt, but the forecast is pointing to Sunday the 6th of September as the best on offer. We've got a cross-offshore wind from the NE at 6 mph, which will keep the faces clean. The swell is a modest 3ft from the SSW with a 12-second period, giving a moderate combined energy of 333. It's not big, but with that clean wind and a decent period, Asakawa could actually turn on. The morning session is the pick. The Monday the 7th and Tuesday the 8th also look promising with clean cross-offshore winds, though the swell is still small. The 8th afternoon sees a jump to 5ft, but the period drops to a short 6 seconds, so it will be a bit lumpy. Still, after the long flat spell, these are the best windows.
To sum it up: the first week is mostly a washout. The best chance for a surf comes way out around the 6th to the 8th of September, with clean winds and a small but workable swell. Keep an eye on it, because at a spot as inconsistent as Asakawa, you have to grab the good days when the forecast lines up.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Thu night. Warm (max 31°C on Tue morning, min 26°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Sun afternoon. Warm (max 30°C on Sat morning, min 26°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | SSE 14 | SSE 13 | SSE 12 | S 12 | S 12 | SSW 11 | SSW 10 | SSE 10 | S 9 | S 8 | S 8 | SSE 7 | SSW 8 | SSW 8 | SSW 8 | S 8 | S 8 | SE 10 | SSW 8 | ESE 5 | ESE 5 |
Wave Graph | |||||||||||||||||||||
3875 | 2005 | 1961 | 1048 | 711 | 353 | 190 | 282 | 240 | 191 | 153 | 49 | 48 | 81 | 58 | 42 | 44 | 38 | 19 | 34 | 31 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | glassy | glassy | glassy | glassy | cross-on | cross-off | glassy | cross-on | cross | on | on | cross-on |
High Tide | 5:25PM1.60m | 4:20AM1.60m | 5:47PM1.67m | 4:59AM1.70m | 6:08PM1.73m | 5:36AM1.78m | 6:30PM1.78m | 6:12AM1.83m | 6:52PM1.81m | 6:48AM1.84m | 7:14PM1.82m | 7:26AM1.80m | 7:38PM1.81m | ||||||||
Low Tide | 10:31AM0.36m | 10:55PM0.96m | 11:05AM0.27m | 11:22PM0.84m | 11:35AM0.21m | 11:50PM0.72m | 12:05PM0.20m | 00:18AM0.60m | 12:33PM0.23m | 00:48AM0.49m | 1:02PM0.31m | 1:19AM0.40m | 1:31PM0.43m | 1:53AM0.35m | |||||||
5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | |
— | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | |
mm | — | — | — | 1 | 1 | — | — | — | 3 | 1 | 1 | — | 1 | 2 | 2 | 1 | 5 | 4 | — | — | 6 |
Temp °C | 31 | 31 | 26 | 31 | 30 | 27 | 31 | 31 | 27 | 28 | 27 | 26 | 30 | 30 | 27 | 30 | 29 | 27 | 30 | 29 | 26 |
Feels °C | 34 | 34 | 31 | 34 | 33 | 31 | 33 | 33 | 31 | 33 | 32 | 31 | 34 | 34 | 32 | 35 | 34 | 32 | 33 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SSE 14 | SSE 13 | SSE 12 | S 12 | S 12 | SSW 11 | SSE 8 | SSW 10 | S 9 | S 8 | S 8 | SSE 7 | SSW 8 | ESE 9 | SSW 8 | S 8 | S 8 | ESE 4 | SSW 8 | SE 10 | ESE 5 |
3875 | 2005 | 1961 | 1048 | 711 | 353 | 157 | 117 | 240 | 191 | 153 | 49 | 48 | 8 | 58 | 42 | 44 | 11 | 19 | 15 | 31 | |
Swell 2 Height (m) Direction Period (s) | E 15 | S 15 | E 13 | SE 10 | SSE 9 | SE 9 | SSW 10 | E 11 | SW 9 | SE 10 | SE 10 | SSW 8 | SSE 7 | SSE 9 | SE 11 | SE 10 | SE 10 | S 8 | SE 10 | S 7 | SE 9 |
17 | 1310 | 32 | 217 | 216 | 178 | 190 | 10 | 21 | 24 | 15 | 26 | 19 | 8 | 19 | 17 | 36 | 29 | 16 | 10 | 31 | |
Swell 3 Height (m) Direction Period (s) | S 18 | E 14 | — | E 13 | E 13 | E 12 | SSE 11 | SE 16 | E 11 | E 11 | WSW 12 | SSE 9 | SE 10 | SE 13 | ESE 9 | ESE 10 | SW 10 | SE 10 | SSW 10 | SSW 9 | S 9 |
942 | 16 | — | 30 | 29 | 25 | 24 | 10 | 9 | 9 | 14 | 8 | 14 | 7 | 8 | 9 | 4 | 38 | 9 | 16 | 27 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | SSE 10 | SSW 8 | — | — | — | — | SSW 8 | SW 5 | — | — | SE 4 | ESE 4 | ESE 5 | — |
— | — | — | — | — | — | — | 282 | 38 | — | — | — | — | 81 | 25 | — | — | 18 | 12 | 34 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 11 | 11 | 2 | 11 | 30 | 2 | 11 | 11 | 2 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 11 | 2 | 14 | 518 | 43 |
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.











