Surf Forecasts:
Asakawa surf forecast from 20 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 9AM (local time) - 18ft (5.5m), 13s period, SE swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 9PM (local time) - 16ft (5.0m), 16s period, SSE swell with 12,846 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 3AM (local time) - 3ft (0.9m), 9s period with S 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 Friday (Aug 21) at 3AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.4m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 5.0m 16s and forecast to arrive on Tuesday (Aug 25) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 21st Aug) | 3ft (0.9m) 9s |
| Best Surf | 9AM (Wed 26th Aug) | 18ft (5.5m) 13s |
| Most Powerful | 9PM (Tue 25th Aug) | 16ft (5.0m) 16s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what Asakawa has in store for us. It starts off quiet, but there are a few days that’ll get the blood pumping.
Water’s warm, around 83°, which is dead average for this time of year. No surprises there.
From Thursday the 20th through the weekend, it’s small. Waist-high slop with combined swell energy under 200. Not really worth the paddle unless you’re on a log and just want to stretch out. Friday morning has a glassy moment, but with only 3ft, it’s a casual session.
Here’s where it gets real. Monday the 24th morning shows 6ft from the SE, with a period of 16 seconds and energy jumping to 2350. The wind is glassy. For a point break like Asakawa, that’s clean, lined-up, and way more fun than the tiny stuff before it. Intermediate friendly, but watch for those longer waits between sets.
Tuesday the 25th is a beast. 15ft to 16ft from the SSE, with energy over 10,000. That’s serious power. The wind is cross or cross-on, so not pristine, but the size is undeniable. This is for experts only.
Wednesday the 26th is the biggest standout. 18ft from the SE, 13-second period, and energy at 20294. The wind is cross-off and clean, but the file says it’s too big for this break. That’s absolute heavy-duty, big-wave territory. Only the most seasoned locals should be out there. Crowds are “sometimes,” but on this day, it’ll be a very small crew.
Thursday the 27th stays huge, with 13ft to 16ft and strong offshore winds out of the NNW at 25 mph. The faces will be clean but paddling in is a mission. This remains expert-only.
From Friday the 28th, it drops. Swell goes down to 4ft to 7ft, with cleaner wind, but nothing special. By the 30th of August through the 4th of September, it’s mostly small, choppy, and weak, with energy in the 300 to 500 range. A real lull.
The pick of the period? Monday the 24th morning for a clean, glassy 6ft SE swell with that 16-second period – that’s the sweet spot for intermediate surfers. For the big-wave crew, Tuesday the 25th and Wednesday the 26th are the heavy hitters, but only if you’ve got the stones for it.
Slow start, one solid mid-week pulse, then a fade. Make the most of that Monday glass-off.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri afternoon. Warm (max 30°C on Fri morning, min 25°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 45mm), heaviest during Wed morning. Warm (max 31°C on Tue morning, min 23°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 10 | S 9 | S 9 | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 9 | SSW 9 | SE 15 | SE 16 | SE 17 | SE 16 | SSE 16 | SSE 16 | SSE 15 | SE 13 | SE 12 | SE 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 25 | 99 | 127 | 145 | 108 | 108 | 80 | 57 | 92 | 98 | 535 | 1718 | 3813 | 6625 | 9892 | 11654 | 10871 | 10620 | 8541 | 3464 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | glassy | cross-on | glassy | glassy | cross-on | cross | glassy | cross-on | cross | glassy | on | glassy | cross | cross-on | cross-on | cross-off | cross-off | cross-off |
High Tide | 9:52PM1.48m | 2:05PM1.21m | 10:36PM1.39m | 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 | ||||||||
Low Tide | 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 | 10:31AM0.36m | 10:55PM0.96m | 11:05AM0.27m | 11:22PM0.84m | |||||||
 |  |  |  | | | |  | | | | | | | |  | |  | |  | |
 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — |
 | 6:44 | — | — | 6:43 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — |
mm | — | — | — | 2 | — | — | 1 | 1 | — | — | — | — | — | — | — | 1 | 24 | 20 | 26 | 33 |
Temp °C | 29 | 26 | 30 | 29 | 26 | 30 | 30 | 26 | 30 | 29 | 26 | 30 | 30 | 26 | 31 | 30 | 27 | 24 | 25 | 26 |
Feels °C | 32 | 31 | 34 | 33 | 30 | 33 | 34 | 30 | 33 | 32 | 30 | 34 | 34 | 31 | 34 | 33 | 30 | 24 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 9 | S 9 | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 9 | SSW 9 | SE 15 | SE 16 | SE 17 | SE 16 | SSE 16 | SSE 16 | SSE 15 | SE 13 | SE 12 | SE 12 |
| kJ | 21 | 99 | 127 | 145 | 108 | 108 | 80 | 57 | 92 | 98 | 535 | 1718 | 3813 | 6625 | 9892 | 11654 | 10871 | 9667 | 6479 | 3464 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | ESE 11 | ESE 11 | SE 11 | ESE 10 | SE 10 | ESE 10 | ESE 11 | SE 13 | SSW 9 | SE 20 | SSW 10 | S 10 | SSW 11 | SW 10 | E 13 | E 19 | S 13 | S 12 |
| kJ | 25 | 28 | 44 | 44 | 29 | 43 | 26 | 10 | 38 | 44 | 76 | 586 | 85 | 98 | 48 | 26 | 32 | 7 | 2817 | 1952 |
Swell 3 Height (m) Direction Period (s) | SE 7 | ESE 7 | ESE 7 | ESE 6 | ESE 6 | SE 9 | ESE 13 | ESE 13 | ESE 6 | ESE 11 | SE 5 | SSW 9 | E 13 | E 12 | E 12 | E 14 | — | — | SW 10 | — |
| kJ | 11 | 9 | 4 | 4 | 3 | 3 | 17 | 16 | 3 | 22 | 4 | 46 | 13 | 44 | 42 | 66 | — | — | 4 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 13 | SE 12 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 10620 | 8541 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 30 | 2 | 0 | 11 | 0 | 0 | 19 | 2 | 0 | 11 | 2 | 0 | 11 | 0 | 22 | 19 | 435 | 473 | 57 | 57 |
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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