Surf Forecasts:
Asakawa surf forecast from 23 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 3AM (local time) - 10ft (3.0m), 15s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 10ft (3.0m), 15s period, SSE swell with 4,279 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 6AM (local time) - 2.5ft (0.8m), 13s 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 Monday (Aug 24) at 6AM. The primary swell is predicted to be 0.8m and 13s period with a secondary swell of 0.6m and 16s. 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 15s and forecast to arrive on Tuesday (Aug 25) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 3s period and expected on Saturday (Aug 29) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 24th Aug) | 2.5ft (0.8m) 13s |
| Best Surf | 3AM (Tue 25th Aug) | 10ft (3.0m) 15s |
| Most Powerful | 9AM (Tue 25th Aug) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's talk about what's cookin' at Asakawa.
We get a green light starting Monday the 24th of August. The swell is out of the SE at 4ft, with a super long 19-second period – that's proper groundswell. The wind is glassy, dead flat, which is a huge positive. The combined energy is a solid 1288 (moderate wave energy). Since it's a point break, that long period will wrap in smooth.
Tuesday the 25th of August is the real standout. The morning is the call. We're looking at a solid 10ft swell from the SSE, with a 15-second period. Glass again. The energy is enormous at 4307 (strong wave energy). This is a big swell, over 8ft, so this is for the experienced crew only. If you've got the skills, the conditions are going to be unreal.
After that, the week goes downhill. From Wednesday the 26th through Friday the 28th, the swell drops and the wind turns cross-onshore, making it choppy and messy. The energy falls to the 200s (weak wave energy). Saturday the 29th and Sunday the 30th are flat and onshore, not worth a look.
We've got a few quiet days. Then, on Sunday the 6th of September, things start to look up again. The swell builds to 6ft from the SSE, period 13 seconds, with clean offshore cross-off winds from the NE. The energy is back up to 1304 (moderate wave energy). This looks good. Monday the 7th of September holds similar conditions, with a chance of glassy conditions in the afternoon. Tuesday the 8th of September keeps it going with a solid 6ft swell and clean winds.
So, the top pick is Tuesday the 25th of August for the big, clean, expert-only waves. The second window is that Sunday to Tuesday run in early September—it's a bit far out, but it's got promise.
Rusty.
Short Range ForecastMostly dry. Warm (max 31°C on Mon morning, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Wed night. Warm (max 31°C on Sat morning, min 26°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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 12 | SE 19 | SE 16 | SSE 16 | SSE 15 | SSE 14 | S 13 | S 13 | S 12 | SSW 11 | SSE 9 | SSE 9 | SSE 8 | SSW 9 | SSW 9 | S 9 | S 8 | SSW 8 | S 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 152 | 1254 | 2357 | 1884 | 4279 | 3898 | 3049 | 1883 | 909 | 431 | 344 | 322 | 202 | 140 | 169 | 225 | 140 | 202 | 111 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | on | glassy | glassy | on | cross-off | cross-on | cross-on | glassy | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 2:31AM1.38m | 5:04PM1.52m | 3:35AM1.49m | 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 | |||||||
Low Tide | 9:51PM1.18m | 9:51AM0.47m | 10:27PM1.07m | 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 | ||||||
 |  | | | | | | |  |  | |  |  |  | | | | |  | |
 | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — |
 | 6:39 | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — |
mm | — | — | — | — | — | — | — | — | — | 1 | — | — | — | 1 | 1 | — | — | 2 | 1 |
Temp °C | 27 | 31 | 30 | 26 | 30 | 30 | 26 | 31 | 31 | 27 | 29 | 28 | 27 | 30 | 30 | 27 | 31 | 31 | 27 |
Feels °C | 32 | 35 | 33 | 31 | 32 | 32 | 30 | 34 | 34 | 32 | 33 | 33 | 31 | 34 | 33 | 32 | 33 | 34 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 12 | SE 19 | SE 16 | SE 14 | SSE 15 | SSE 14 | S 13 | S 13 | S 12 | SSW 11 | SSE 9 | SSE 9 | SSE 8 | SSW 9 | SSW 9 | S 9 | S 8 | ESE 9 | S 8 |
| kJ | 152 | 1254 | 2357 | 1704 | 4279 | 3898 | 3049 | 1883 | 909 | 431 | 344 | 322 | 202 | 140 | 169 | 225 | 140 | 16 | 111 |
Swell 2 Height (m) Direction Period (s) | SSW 9 | S 8 | SSW 8 | SSE 16 | E 15 | E 14 | E 13 | SE 10 | SE 9 | SSE 9 | SSW 11 | SSW 11 | SSW 8 | SSE 8 | SE 10 | ESE 9 | SE 10 | SE 13 | SE 11 |
| kJ | 30 | 21 | 21 | 1884 | 17 | 16 | 32 | 173 | 242 | 211 | 291 | 143 | 72 | 102 | 15 | 8 | 14 | 7 | 19 |
Swell 3 Height (m) Direction Period (s) | S 8 | SW 9 | SW 9 | E 11 | E 12 | E 11 | — | E 13 | E 13 | E 12 | E 12 | E 11 | SW 9 | SE 10 | E 10 | SSE 9 | SE 13 | SE 9 | ESE 9 |
| kJ | 21 | 13 | 37 | 10 | 11 | 10 | — | 30 | 29 | 25 | 11 | 10 | 41 | 15 | 8 | 9 | 27 | 3 | 8 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSE 7 | — | — | SSW 8 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 89 | — | — | 202 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 2 | 0 | 11 | 0 | 0 | 11 | 0 | 11 | 11 | 0 | 11 | 2 | 2 | 11 | 11 | 2 | 11 | 30 | 2 |
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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