Surf Forecasts:
Asakawa surf forecast from 24 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 6AM (local time) - 8ft (2.5m), 14s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 10ft (3.0m), 14s period, SSE swell with 3,875 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 6AM (local time) - 8ft (2.5m), 14s period with SSE 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 25) at 6AM. The primary swell is predicted to be 2.5m and 14s period with a secondary swell of 1.8m and 17s. 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 14s and forecast to arrive on Tuesday (Aug 25) 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+) | 6AM (Tue 25th Aug) | 8ft (2.5m) 14s |
| Best Surf | 6AM (Tue 25th Aug) | 8ft (2.5m) 14s |
| Most Powerful | 9AM (Tue 25th Aug) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. We’ve got a look at Asakawa, and it’s a bit of a mixed bag over the next 16 days. The week starts with a real tease, but then conditions get messy. There’s a promising window later on, but you’ll need to be patient and a bit experienced to make the most of it.
The first real action is Monday morning, August 24th. The water is sitting at about 84°F, which is pretty much normal for this time of year. We’ve got a clean 4 ft swell from the SE, with a super long period of 19 seconds. That’s a proper groundswell rolling in, with plenty of energy behind it (1288). The wind is glassy, and Asakawa is a point break that loves this kind of incoming direction. This is your standout session for the early period. However, that long period makes it a bit tricky for the sandbanks; it will be better formed and more consistent here at the point. Keep in mind the spot is inconsistent, so when it’s on, it’s worth the wait, but it can be a bit of a gamble. Crowds are possible here.
After that glassy Monday, the wind turns onshore from the S and the swell jumps up to 7 ft - 10 ft with a shorter period. The energy is still strong (2415 to 3584), but the wind is spoiling it. The swell is big enough that it’s only for the more experienced crew, and the onshore wind will make it choppy and hard to manage. This messy pattern holds right through the end of the month into the first days of September. The swell drops off, but the wind stays mostly cross-onshore and the surf quality is poor. For about a week, from Wednesday the 27th of August through to Tuesday the 2nd of September, the outlook is pretty ordinary. You’ll see small, weak swell (energy dropping to as low as 61) and mostly grotty conditions.
Now, here’s the real hope. Thursday morning, September 3rd, things flip. A clean 5 ft swell from the S arrives with a nice 14-second period, and the wind turns cross-offshore from the NNE. This is clean, lined-up surf. The energy is solid at 1389. This is great for experienced surfers, but the 5 ft height is still manageable for a strong intermediate. The real standout of the whole forecast though is Friday morning, September 4th. The swell builds to 8 ft from the S with a 13-second period, and the wind stays clean cross-offshore from the NE. The energy is pumping at 2182. This is a big swell, definitely for experts only, but the conditions are excellent. The wind is light and clean, the water will be smooth. This is the session to circle on your calendar if you’ve got the skills.
The surf starts to fade out again that Friday afternoon, with the wind swinging onshore and the swell dropping through the rest of the weekend. By Monday the 7th and Tuesday the 8th of September, we’re back to small, weak conditions. The long-range call for the 3rd and 4th of September is promising, but always a bit less certain this far out.
Rusty.
Short Range ForecastMostly dry. Warm (max 31°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 19mm), heaviest on Thu afternoon. Warm (max 31°C on Thu afternoon, min 26°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 16 | SE 16 | SSE 14 | SSE 13 | S 14 | S 13 | SSW 12 | SSW 12 | SSW 12 | SSW 11 | S 8 | S 8 | SSW 9 | SSW 8 | S 8 | SSW 8 | S 8 | SSW 9 | SSW 8 | SE 10 |
Wave Graph | ||||||||||||||||||||
2357 | 2844 | 3875 | 2005 | 2694 | 1592 | 1155 | 866 | 483 | 218 | 279 | 157 | 101 | 188 | 130 | 115 | 86 | 108 | 90 | 39 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | cross-on | on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | glassy | cross-on | cross-off | glassy | cross-on | cross |
High Tide | 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 | 6:48AM1.84m | 7:14PM1.82m | |||||||
Low Tide | 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 | 1:02PM0.31m | 1:19AM0.40m | |||||||
— | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | |
6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:30 | — | |
mm | — | — | — | — | — | — | — | — | — | 2 | 4 | 4 | 3 | 1 | — | 3 | 2 | — | — | — |
Temp °C | 30 | 26 | 31 | 30 | 26 | 31 | 29 | 27 | 31 | 31 | 27 | 30 | 29 | 27 | 31 | 30 | 27 | 31 | 31 | 26 |
Feels °C | 33 | 31 | 34 | 33 | 30 | 34 | 33 | 31 | 34 | 34 | 32 | 34 | 33 | 32 | 35 | 34 | 32 | 35 | 33 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 16 | SE 16 | SSE 14 | SSE 13 | S 14 | S 13 | SSW 12 | SSW 12 | SSW 12 | SSE 9 | SSE 9 | S 8 | SSE 8 | SSW 8 | S 8 | SSW 8 | S 8 | SSW 9 | SE 10 | S 7 |
2357 | 2844 | 3875 | 2005 | 2694 | 1592 | 1155 | 866 | 483 | 169 | 232 | 157 | 85 | 96 | 130 | 115 | 86 | 108 | 37 | 28 | |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SSE 18 | E 15 | S 15 | E 13 | SE 9 | SSE 9 | SSE 9 | SSE 10 | SSW 11 | SSW 10 | SW 9 | SE 10 | SSE 7 | SE 9 | ESE 9 | SW 10 | SE 10 | SW 10 | SE 10 |
21 | 1474 | 17 | 1345 | 32 | 188 | 216 | 168 | 175 | 218 | 81 | 20 | 14 | 47 | 13 | 7 | 28 | 17 | 15 | 39 | |
Swell 3 Height (m) Direction Period (s) | SSW 9 | E 11 | SW 10 | E 14 | — | E 13 | E 13 | SSE 12 | E 12 | SE 10 | E 11 | SE 10 | SW 12 | SSE 9 | SW 12 | SW 12 | SE 11 | ESE 10 | E 7 | SW 10 |
30 | 10 | 14 | 16 | — | 30 | 29 | 28 | 24 | 17 | 9 | 23 | 23 | 8 | 22 | 6 | 19 | 9 | 4 | 23 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | S 8 | — | SSW 9 | SSW 8 | — | — | — | — | SSW 8 | SW 3 |
— | — | — | — | — | — | — | — | — | — | 279 | — | 101 | 188 | — | — | — | — | 90 | 2 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 11 | 2 | 11 | 11 | 0 | 11 | 30 | 2 | 11 | 11 | 2 | 11 | 11 | 2 | 11 | 30 | 0 | 1 | 385 |
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.











