Surf Forecasts:
Asakawa surf forecast from 18 Aug 2026:
- Best quality surf: Monday 24 Aug, 9PM (local time) - 10ft (3.0m), 17s period, SE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 11ft (3.5m), 16s period, SE swell with 5,606 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 9PM (local time) - 1.5ft (0.4m), 10s 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 Tuesday (Aug 18) at 9PM. The primary swell is predicted to be 0.4m and 10s period with a secondary swell of 0.4m and 8s. Another secondary swell of 0.7m and 5s is also forecast. 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-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 18th Aug) | 1.5ft (0.4m) 10s |
| Best Surf | 9PM (Mon 24th Aug) | 10ft (3.0m) 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. Let's break it down.
First off, the next few days are a total bust. From Tuesday the 18th right through to Sunday the 23rd of August, it's flat and messy. Tiny waves, mostly under 2 ft, with onshore winds and storms. The energy is weak, barely registering. Nothing worth getting wet for.
Then on Monday the 24th of August morning, things start to change. Swell hits 6 ft from the SE with a long 17-second period. The energy jumps to a strong 2273, and with glassy conditions, Asakawa starts to look good. This is a serious groundswell, so the point should be handling it well. Water temp is about 83°, which is normal for this time of year.
Now, the real standout is Wednesday the 26th of August. The morning session at Asakawa is the one to lock in. We’ve got a solid 12 ft swell from the SSE, a long 16-second period, and energy cranking at 6303. The wind is cross-offshore from the NE, keeping it clean. This is big – over 8 ft – so it's for the experts only. Beginners, stay on the beach. This is the best of the whole run, with that clean, powerful groundswell hitting the point just right.
Thursday the 27th of August morning is also a beauty – same 12 ft size, clean cross-off winds, and strong energy at 5839. Another big day for the experienced crew.
After that, Friday the 28th holds size but the wind goes cross, and by Saturday the 29th a fresh NNE breeze starts to mess with the quality. The swell stays big, but conditions get marginal. Monday the 31st of August brings rain and choppy cross-onshore winds, so the window shuts pretty fast after that.
Mark your calendar for Wednesday and Thursday mornings. That’s where the magic is.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Tue morning. Warm (max 29°C on Wed morning, min 25°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sun afternoon. Warm (max 30°C on Fri morning, min 25°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 11 | SE 5 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | S 9 | S 9 | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SE 14 | SE 16 | SE 17 | SE 17 | SE 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 29 | 36 | 27 | 36 | 26 | 25 | 25 | 35 | 99 | 125 | 148 | 138 | 110 | 110 | 82 | 55 | 51 | 260 | 2167 | 2945 | 5452 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | on | on | glassy | cross-on | on | glassy | glassy | on | glassy | glassy | on | cross | glassy | on | cross | glassy | on | glassy |
High Tide | 9:14AM1.51m | 9:01PM1.65m | 10:05AM1.37m | 9:25PM1.57m | 11:17AM1.25m | 9:52PM1.48m | 2:05PM1.21m | 10:36PM1.39m | 4:20PM1.32m | 00:36AM1.34m | 4:43PM1.42m | 2:31AM1.38m | 5:04PM1.52m | ||||||||
Low Tide | 2:55PM0.76m | 3:42AM0.53m | 3:19PM0.92m | 4:31AM0.59m | 3:42PM1.07m | 5:42AM0.66m | 4:07PM1.20m | 7:28AM0.66m | 8:19PM1.26m | 8:57AM0.58m | 9:51PM1.18m | 9:51AM0.47m | 10:27PM1.07m | ||||||||
 | |  | | |  | | |  |  | | | | | | | | | | | | |
 | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — |
 | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — |
mm | 2 | 1 | 3 | 2 | 1 | — | 1 | 2 | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 28 | 28 | 26 | 29 | 28 | 26 | 28 | 28 | 26 | 30 | 29 | 26 | 30 | 30 | 26 | 30 | 30 | 26 | 30 | 30 | 26 |
Feels °C | 31 | 31 | 31 | 33 | 32 | 32 | 32 | 32 | 31 | 33 | 32 | 30 | 33 | 33 | 31 | 33 | 34 | 30 | 33 | 34 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 11 | SE 10 | SE 5 | ESE 8 | ESE 5 | ESE 5 | SE 10 | S 8 | S 9 | S 9 | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SE 13 | SE 17 | SE 17 | SE 17 |
| kJ | 29 | 28 | 23 | 36 | 14 | 14 | 25 | 35 | 99 | 125 | 148 | 138 | 110 | 110 | 82 | 55 | 39 | 175 | 2167 | 2945 | 5452 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SSW 8 | SE 10 | SE 10 | ESE 8 | SE 10 | S 8 | ESE 6 | SE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | ESE 10 | ESE 10 | ESE 11 | SE 14 | SE 16 | S 8 | SW 9 | SSW 8 |
| kJ | 11 | 11 | 27 | 26 | 19 | 25 | 13 | 17 | 29 | 44 | 44 | 44 | 42 | 20 | 11 | 37 | 51 | 260 | 34 | 13 | 37 |
Swell 3 Height (m) Direction Period (s) | ESE 8 | ESE 8 | ESE 8 | SSW 8 | SE 10 | SSW 7 | S 10 | SE 10 | ESE 7 | ESE 7 | ESE 6 | ESE 6 | SE 9 | ESE 7 | ESE 6 | SSE 10 | ESE 10 | S 8 | E 12 | E 13 | — |
| kJ | 13 | 13 | 13 | 11 | 26 | 5 | 8 | 25 | 9 | 4 | 4 | 3 | 3 | 4 | 4 | 9 | 22 | 34 | 72 | 12 | — |
Wind waves Height (m) Direction Period (s) | SE 5 | SE 5 | — | ESE 4 | — | — | ESE 7 | — | — | — | — | — | — | — | — | — | — | — | — | S 8 | — |
| kJ | 24 | 36 | — | 13 | — | — | 25 | — | — | — | — | — | — | — | — | — | — | — | — | 66 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 43 | 11 | 1 | 14 | 521 | 6 | 43 | 11 | 0 | 0 | 11 | 0 | 0 | 19 | 2 | 0 | 11 | 2 | 0 | 11 | 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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