Surf Forecasts:
Asakawa surf forecast from 21 Aug 2026:
- Best quality surf: Monday 24 Aug, 6PM (local time) - 8ft (2.4m), 16s period, SE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 12PM (local time) - 13ft (4.0m), 16s period, SSE swell with 6,868 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 12AM (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 12AM. The primary swell is predicted to be 0.8m 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 4.0m 16s and forecast to arrive on Tuesday (Aug 25) at 12PM. 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+) | 12AM (Sat 22nd Aug) | 2.5ft (0.8m) 9s |
| Best Surf | 6PM (Mon 24th Aug) | 8ft (2.4m) 16s |
| Most Powerful | 12PM (Tue 25th Aug) | 13ft (4.0m) 16s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s cooking at Asakawa.
We’ve got a bit of a slow start, but the second week is where it really gets interesting. The water is sitting at 83°, which is about average for this time of year, nothing unusual there.
The first few days are pretty flat and forgettable. Friday and Saturday mornings will see tiny, knee-high waves around 3 ft to 3 ft from the S/SSW. It’s glassy early, which is nice, but there’s just no energy – the combined swell energy is only 175, so it’s weak. Not worth paddling for.
Sunday morning stays small at 2 ft, and the period drops to 8 seconds, making it weak and crumbly. Then we hit a real lull. From Sunday afternoon right through to the end of the month, there’s nothing that gets a strong recommendation. The conditions go downhill with cross-onshore winds and building storms. There’s a gap of about 3 or 4 days where the surf just isn’t good enough to recommend.
Now, things start to shift on Monday the 24th of August. That morning brings a standout window. The swell jumps to 5 ft from the SE with a 19-second period – that’s very long period groundswell. The combined energy is 1735 (moderate to strong) and it’s glassy. For a point break like Asakawa, that long period is perfect, meaning well-shaped, clean lines. It’s a spot that’s inconsistent, so when it fires like this, it’s special. It’s intermediate-friendly at this size, too. The afternoon gets bigger – 8 ft – but the wind shifts onshore, and it gets stormy, so that morning is the pick.
The next few days see huge swell, but it’s messy. Tuesday the 25th shows 13 ft from the SSE with period around 16 seconds. That’s expert-only territory. The combined energy is 6858 – very strong – but the wind is cross-onshore and there’s a risk of thunderstorms. It’s more of a serious, big-wave mission than a fun session. Wednesday the 26th and Thursday the 27th stay big and messy, with onshore winds and energy still high. Friday the 28th drops back to 6 ft to 6 ft, but with short 8-second period and onshore wind, it’s still not great.
Looking further out, there’s another real standout. On the 3rd of September, we see excellent conditions. The swell is 7 ft to 7 ft from the E/ESE, with periods between 14 and 17 seconds. The combined swell energy is over 2000, and the wind is cross-offshore out of the NE at 9 mph – clean, crisp, and lined up. This is a long-period groundswell hitting the point just right. The morning of the 3rd is the real gem, with the afternoon and the 4th also offering excellent surf at around 7 ft. This is the best on offer for the entire outlook. By the 5th, it fades back to small and weaker options.
So overall, keep an eye on Monday morning the 24th of August and the 3rd to 4th of September for the true standouts. The rest of the time is either small, messy, or too big for comfortable surfing.
- Rusty
Short Range ForecastLight rain (total 8mm), mostly falling on Fri afternoon. Warm (max 31°C on Sun morning, min 25°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 74mm), heaviest during Thu morning. Warm (max 29°C on Mon afternoon, min 25°C on Mon night). Winds increasing (calm on Mon night, fresh winds from the SE by Thu morning). | |||||||||||||||||||
Fri 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
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) | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SE 13 | SE 12 | SE 19 | SE 16 | SSE 17 | SSE 16 | SSE 15 | SSE 14 | S 13 | S 12 | SSW 11 | SSW 10 | S 9 | S 10 |
Wave Graph | ||||||||||||||||||||
145 | 108 | 108 | 80 | 55 | 54 | 44 | 152 | 959 | 2600 | 5798 | 6760 | 6637 | 5530 | 4369 | 2261 | 933 | 370 | 1163 | 1325 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | cross-on | cross | glassy | on | cross | on | on | glassy | cross-on | cross-on | glassy | cross-on | on | on | on | on | on |
High Tide | 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 | 4:59AM1.70m | 6:08PM1.73m | ||||||||
Low Tide | 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 | 11:35AM0.21m | 11:50PM0.72m | |||||||
— | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | |
6:43 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | |
mm | 3 | 2 | — | 2 | 1 | — | — | — | — | 1 | — | — | 2 | 8 | 8 | 12 | 22 | 21 | 27 | 76 |
Temp °C | 29 | 26 | 30 | 29 | 26 | 31 | 30 | 26 | 29 | 29 | 26 | 29 | 29 | 26 | 27 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 33 | 30 | 33 | 32 | 31 | 34 | 34 | 31 | 33 | 33 | 32 | 32 | 33 | 31 | 29 | 29 | 28 | 26 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | S 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | S 8 | SE 12 | SE 19 | SE 16 | SSE 17 | SSE 16 | SSE 15 | SSE 14 | S 13 | S 12 | SSW 11 | SE 8 | SSE 9 | S 9 |
145 | 108 | 108 | 80 | 55 | 54 | 35 | 152 | 959 | 2600 | 5798 | 6760 | 6637 | 5530 | 4369 | 2261 | 933 | 330 | 917 | 924 | |
Swell 2 Height (m) Direction Period (s) | ESE 11 | SE 11 | ESE 10 | SE 10 | ESE 10 | ESE 11 | SW 10 | SW 9 | SE 12 | SE 12 | SW 10 | E 15 | E 14 | E 13 | E 13 | SE 10 | SE 9 | SSW 10 | E 11 | E 11 |
44 | 29 | 43 | 17 | 10 | 38 | 26 | 41 | 256 | 164 | 24 | 17 | 16 | 32 | 30 | 416 | 342 | 370 | 10 | 9 | |
Swell 3 Height (m) Direction Period (s) | ESE 6 | ESE 6 | ESE 7 | E 10 | ESE 13 | ESE 6 | SE 13 | S 8 | SSW 9 | S 9 | E 12 | E 15 | — | — | — | E 13 | E 12 | E 12 | SE 16 | SE 15 |
4 | 3 | 4 | 8 | 16 | 3 | 44 | 21 | 42 | 39 | 44 | 17 | — | — | — | 29 | 11 | 11 | 10 | 9 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | SSW 2 | — | — | — | — | — | — | — | — | — | — | — | S 9 | S 10 |
— | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | 1163 | 1325 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 11 | 2 | 0 | 30 | 2 | 0 | 11 | 2 | 0 | 19 | 0 | 19 | 19 | 57 | 369 | 369 | 369 | 370 | 11 |
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.











