Surf Forecasts:
Asakawa surf forecast from 24 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 3AM (local time) - 8ft (2.5m), 15s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 10ft (3.0m), 15s period, SSE swell with 3,983 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 3AM (local time) - 8ft (2.5m), 15s 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 3AM. The primary swell is predicted to be 2.5m and 15s period with a secondary swell of 1.5m and 18s. 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 onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 25th Aug) | 8ft (2.5m) 15s |
| Best Surf | 3AM (Tue 25th Aug) | 8ft (2.5m) 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 folks, Rusty here. Let’s have a look at what’s on the cards for Asakawa over the next couple of weeks.
Right off the bat, we’ve got a standout morning on Monday, 24 August. The water’s sitting at 84°, which is just about spot on for the time of year, nothing unusual there. The swell is coming straight out of the southeast at 4ft, with a period of 19 seconds – that’s proper long-period groundswell, full of energy and shape. The combined energy is a solid 1288 (moderate wave energy), and with glassy conditions and a light SSE breeze, it’s going to be clean as a whistle. Because it’s a point break, that long period should wrap in beautifully, offering long, rippable walls. It’s inconsistent though, so you’ll need patience, but the waves that come through will be worth it. Crowds are possible here, so get in early.
Monday afternoon, the swell jumps up to 7ft from the SE, still with a nice 16-second period, but the wind swings onshore from the south, making it a bit of a mixed bag. The energy is up to 2408, so there’s plenty of power, but the conditions aren’t as clean.
Tuesday the 25th morning sees even bigger surf – 10ft from the SSE, period 15 seconds, and energy at 4017. That’s strong wave energy. This is getting into the big stuff, only for experienced surfers. The wind is light onshore, so it’ll be a bit bumpy.
Wednesday the 26th is losing steam, with a 7ft SSE swell and cross-onshore winds building to 12 mph by the afternoon. The energy drops to 1765, and it’s looking choppy and unappealing. Thursday and Friday are even smaller, with winds messing things up, and the swell drops below 5ft by the weekend. From the 29th of August through to the 1st of September, we’ve got a real flat spell – tiny waves under 3ft, mostly messy wind, and poor conditions. There’s a long gap of several days with nothing worth paddling out for.
Then, on Wednesday the 2nd of September, things perk up. The morning has a 6ft SSW swell with a 14-second period, and the energy is 1377. There’s a risk of thunderstorms, but the wind is light from the ENE. The real highlight is Wednesday afternoon: 7ft from the SSW, period 13 seconds, and clean cross-offshore winds from the NNE at 9 mph. The energy is 1428, and it’s marked as excellent for experienced surfers. That’s the best call of the second week, but it’s a week and a half out, so keep an eye on the forecast.
After that, the swell fades again through the 3rd to the 8th of September, with small, weak, and often choppy conditions. Nothing else really stands out.
So, for the best of the outlook: Monday morning, 24 August at Asakawa is your top pick. Clean, glassy, long-period groundswell from the southeast. Get it while it’s good.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed night. Warm (max 31°C on Mon morning, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Thu afternoon. Warm (max 30°C on Sat morning, min 25°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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 19 | SE 16 | SE 16 | SSE 15 | SSE 13 | S 13 | S 13 | S 12 | SSW 11 | SSW 11 | SSE 9 | SSE 8 | SSE 8 | SSW 9 | S 8 | S 8 | S 9 | S 8 | S 7 | S 7 | SSW 10 |
Wave Graph | |||||||||||||||||||||
1254 | 2357 | 2844 | 3983 | 2651 | 2287 | 1543 | 925 | 415 | 353 | 300 | 221 | 122 | 162 | 167 | 72 | 117 | 82 | 68 | 68 | 210 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross | on | on | cross | cross-on | cross-on | cross | cross-on | cross | cross-on | glassy | cross-on | cross-off | glassy | cross-on | cross-off | cross-on | 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 | 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 | 1:02PM0.31m | 1:19AM0.40m | |||||||
5:30 | — | — | 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 | — | — | — | — | — | — | — | — | 1 | 2 | 5 | — | 2 | 1 | — | — | — | 3 | — | — | — |
Temp °C | 31 | 30 | 26 | 30 | 30 | 26 | 31 | 31 | 27 | 27 | 26 | 26 | 28 | 28 | 26 | 30 | 30 | 27 | 31 | 31 | 26 |
Feels °C | 35 | 33 | 31 | 32 | 33 | 30 | 34 | 34 | 31 | 31 | 31 | 31 | 32 | 32 | 30 | 33 | 34 | 31 | 33 | 33 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 19 | SE 16 | SE 16 | SSE 15 | SSE 13 | S 13 | S 13 | S 12 | SSW 11 | SSW 11 | SSE 9 | SSE 8 | SSE 8 | SSW 9 | S 8 | S 8 | S 9 | S 8 | SW 9 | SSW 10 | S 7 |
1254 | 2357 | 2844 | 3983 | 2651 | 2287 | 1543 | 925 | 415 | 353 | 300 | 221 | 122 | 162 | 167 | 72 | 117 | 82 | 40 | 35 | 47 | |
Swell 2 Height (m) Direction Period (s) | S 8 | SSW 8 | SSE 18 | E 15 | E 14 | E 13 | SE 9 | SSE 9 | SE 9 | SSE 8 | SSW 11 | SSW 10 | SSW 8 | SSE 7 | ESE 9 | SSW 9 | SW 10 | SW 11 | SE 10 | SE 10 | SSW 9 |
21 | 21 | 1474 | 17 | 16 | 32 | 192 | 221 | 182 | 143 | 146 | 61 | 92 | 64 | 8 | 32 | 27 | 30 | 36 | 37 | 34 | |
Swell 3 Height (m) Direction Period (s) | SW 9 | SSW 9 | E 11 | E 15 | E 14 | E 13 | E 13 | E 13 | E 12 | E 12 | E 11 | E 11 | SE 10 | E 11 | SSE 9 | SW 11 | ESE 9 | SE 11 | — | E 10 | SE 10 |
13 | 30 | 10 | 17 | 103 | 127 | 30 | 29 | 25 | 24 | 10 | 9 | 15 | 9 | 9 | 19 | 8 | 19 | — | 2 | 38 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 7 | S 7 | SSW 10 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 68 | 68 | 210 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 11 | 2 | 11 | 11 | 2 | 11 | 30 | 2 | 11 | 2 | 11 | 0 | 2 | 0 | 0 | 11 | 0 | 11 | 11 | 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.











