Surf Forecasts:
Asakawa surf forecast from 21 Aug 2026:
- Best quality surf: Monday 24 Aug, 6PM (local time) - 8ft (2.5m), 17s period, SE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 11ft (3.5m), 16s period, SSE swell with 6,846 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9AM (local time) - 2.5ft (0.8m), 9s period with SSW 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 Saturday (Aug 22) at 9AM. The primary swell is predicted to be 0.8m and 9s 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 3.5m 16s and forecast to arrive on Tuesday (Aug 25) at 9AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Friday (Aug 28) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sat 22nd Aug) | 2.5ft (0.8m) 9s |
| Best Surf | 6PM (Mon 24th Aug) | 8ft (2.5m) 17s |
| Most Powerful | 9AM (Tue 25th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here, and I’ve been staring at the charts for Asakawa. It’s a bit of a slow burner, but there’s some serious juice coming if you’re willing to wait.
Right now, Saturday morning the 22nd is just a tease. We’ve got glassy conditions and a clean 3 ft SSW swell (155 energy), but it’s pretty ordinary – not worth paddling out for. The real story starts next week.
Monday the 24th morning is our first proper standout. The wind is glassy, the swell is a clean 4 ft from the SE with a 19-second period. That’s a long-period groundswell, and the combined energy is a solid 1112 – moderate, but the quality is there. This is a point break, so those long-period lines will wrap in nicely. The water temp is about average for this time of year, so no surprises there.
Then, hold onto your board. Tuesday the 25th morning sees a big jump to 13 ft from the SSE with a 16-second period and massive energy (6946). That’s strong, powerful, and for experts only. The wind is light cross-onshore, which is a bit of a bummer, but the size and period are undeniable. Wednesday the 26th is similar, but with rain and more wind, so it’s messy.
There’s a bit of a lull, but Thursday the 27th afternoon brings a glassy window with 5 ft SSE swell, and Friday the 28th morning has glassy 5 ft from the S. Both are decent, clean options.
Now, the real payoff. Tuesday the 1st of September morning is absolute fire. Glassy, 12 ft from the ESE, 11-second period, and energy at 4845. That’s excellent for experienced surfers – big, clean, powerful. Wednesday the 2nd morning is even bigger at 13 ft, with a clean cross-off wind from the NNE. That’s a day for the charger crew.
The action slows again into the second week. Thursday the 3rd morning holds 13 ft SSE with clean cross-off winds, but by Friday the 4th morning we’re back to a glassy 5 ft SSW with 11-second period – a nice, clean, smaller window. Saturday the 5th afternoon is glassy with 4 ft SSE and 9-second period, and Sunday the 6th morning has a clean cross-off 5 ft SSE with a 12-second period.
So, the standout is clear: Monday the 24th morning for the first clean, quality groundswell, and then Tuesday the 1st of September morning for the big, glassy, powerful stuff. If you’re an experienced surfer, mark that second day on your calendar.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Sat afternoon. Warm (max 31°C on Sat morning, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 63mm), heaviest during Thu morning. Warm (max 29°C on Tue morning, min 25°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | |||||||||||||||
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) | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SE 13 | SE 12 | SE 19 | SE 16 | SSE 16 | SSE 16 | SSE 15 | S 14 | S 13 | S 12 | SSE 10 | SSE 9 | S 9 | S 9 | S 9 | S 9 | SSE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 108 | 80 | 55 | 54 | 45 | 152 | 1241 | 2937 | 2888 | 6846 | 6268 | 4986 | 2345 | 1557 | 627 | 432 | 372 | 363 | 318 | 441 | 276 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | glassy | on | cross | on | on | glassy | cross | cross-on | glassy | glassy | cross-on | cross-on | on | on | cross-on | glassy | cross-off | glassy |
High Tide | 4:20PM1.32m | 00:36AM1.34m | 4:43PM1.42m | 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 | ||||||||
Low Tide | 8:19PM1.26m | 8:57AM0.58m | 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 | ||||||||
 |  |  | | |  |  | | | |  | | |  | | | |  |  |  |  | |
 | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — |
 | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:34 | — |
mm | — | 2 | 1 | — | 1 | — | — | 1 | — | — | 1 | 10 | 4 | 7 | 20 | 10 | 3 | 8 | 3 | — | — |
Temp °C | 31 | 30 | 27 | 31 | 30 | 27 | 29 | 29 | 26 | 29 | 29 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 27 | 26 | 26 |
Feels °C | 34 | 34 | 32 | 34 | 34 | 32 | 33 | 33 | 31 | 32 | 33 | 31 | 32 | 30 | 29 | 30 | 30 | 30 | 32 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 9 | SSW 8 | SSW 8 | S 8 | SE 12 | SE 19 | SE 16 | SSE 16 | SSE 16 | SSE 15 | S 14 | S 13 | S 12 | SSE 10 | SSE 9 | S 9 | S 9 | S 9 | S 9 | SSE 9 |
| kJ | 108 | 80 | 55 | 54 | 30 | 152 | 1241 | 2937 | 2888 | 6846 | 6268 | 4986 | 2345 | 1557 | 627 | 432 | 372 | 363 | 318 | 441 | 276 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | SE 10 | ESE 10 | ESE 11 | SE 13 | S 8 | S 8 | SSW 9 | SE 14 | E 15 | E 14 | E 13 | SE 9 | E 13 | SSW 11 | SSW 11 | E 11 | SSW 11 | ESE 10 | E 11 | ESE 9 |
| kJ | 43 | 17 | 10 | 38 | 45 | 33 | 21 | 42 | 1862 | 17 | 16 | 32 | 284 | 29 | 160 | 101 | 10 | 24 | 19 | 9 | 16 |
Swell 3 Height (m) Direction Period (s) | ESE 7 | E 10 | ESE 13 | ESE 6 | ESE 11 | SSW 9 | SW 9 | SSE 8 | E 11 | — | — | — | E 13 | E 19 | E 12 | E 12 | SW 13 | E 11 | SSW 10 | ESE 9 | SE 12 |
| kJ | 4 | 8 | 16 | 3 | 23 | 30 | 19 | 13 | 10 | — | — | — | 30 | 7 | 25 | 24 | 7 | 9 | 20 | 8 | 6 |
Wind waves Height (m) Direction Period (s) | — | SSW 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNE 3 | — | — |
| kJ | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 19 | 2 | 0 | 11 | 2 | 19 | 11 | 0 | 43 | 19 | 0 | 0 | 370 | 43 | 6 | 11 | 11 | 0 | 0 | 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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