
Surf Forecasts:
Asakawa surf forecast from 5 Aug 2026:
- Best quality surf: Wednesday 5 Aug, 6PM (local time) - 15ft (4.5m), 16s period, SE swell with glassy winds.
- Most powerful swell: Thursday 6 Aug, 3PM (local time) - 16ft (5.0m), 14s period, SE swell with 10,852 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 6PM (local time) - 15ft (4.5m), 16s 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 Wednesday (Aug 05) at 6PM. The primary swell is predicted to be 4.5m and 16s period. 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 14s and forecast to arrive on Thursday (Aug 06) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Aug 12) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Wed 5th Aug) | 15ft (4.5m) 16s |
| Best Surf | 6PM (Wed 5th Aug) | 15ft (4.5m) 16s |
| Most Powerful | 3PM (Thu 6th Aug) | 16ft (5.0m) 14s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let’s get into it.
The long-range picture has a bit of a rough start, but there’s a proper pulse lurking a week and a half out that’s worth keeping an eye on. The first few days are a bit messy, with cross-shore and cross-onshore winds messing with the swell. It’s not a total washout, but you’ll be working for it.
The first real window is Wednesday morning, August 5th. The swell is a solid 15ft from the ESE at 16 seconds, which is proper groundswell. The wind is light cross from the ENE, so it’ll be a touch textured but not terrible. The energy is strong, reading 9886, and the water is a touch warmer than usual at 84°F, which is a bit notable for the time of year. This is a big, powerful wave, so it’s not for the faint of heart. It might be a bit much for beginners, but for the experienced crew, it’s got some punch.
The rest of that first week is a downgrade. By Thursday afternoon, the wind picks up and it gets choppy, and it stays that way through the weekend. The swell drops, the wind swings onshore, and there’s a lot of cross-chop. It’s not worth paddling out for unless you’re desperate for a fight. There are a few stormy periods with that easterly wind, so it’s going to be a messy few days.
Then we hit a bit of a lull from Monday the 10th through to the 14th. The swell drops off hard, and while there are some glassy mornings, the waves are small and weak. The 11th and 12th have some clean, glassy conditions, but the swell is only around 4ft to 5ft from the SSW. There’s a window on the morning of the 11th with zero wind and a 4ft SSW swell at 12 seconds, but it’s pretty gutless. It’s surfable but not worth getting excited about.
Here’s the standout. The swell arrives on Tuesday, August 19th. The morning is looking like the pick of the whole period. We’ve got a 13ft swell from the SE at 15 seconds, with light offshore cross-off winds from the NE. The energy is strong at 6081, and the conditions are clean. This is a proper groundswell, and at a point break like Asakawa, that long period should wrap in nicely. This is the one you’ve been waiting for. It’s big, so it’s strictly for the experienced surfers—this is well over 8ft, so the beginners need to stay on the beach. The afternoon before, on the 18th, has some promise too, with a 4ft SE swell at 18 seconds, but the morning of the 19th is the one.
The last couple of days look like a step down again, with the swell backing off and the wind turning onshore, but that one morning is the golden ticket.
So, in short: the next week is mostly a struggle, but hold out for Tuesday the 19th. That’s your day.
Rusty
Short Range ForecastHeavy rain (total 43mm), heaviest during Fri afternoon. Warm (max 31°C on Wed afternoon, min 26°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Sun night. Warm (max 29°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
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) | ESE 16 | SE 16 | SE 15 | SE 14 | SE 14 | SSE 15 | SSE 14 | SSE 14 | SSE 13 | S 13 | SSW 13 | SSW 13 | E 13 | SSW 14 | SSW 14 | SW 14 | SSW 13 | SSW 13 | S 12 | SSW 12 | SSW 11 |
Wave Graph | |||||||||||||||||||||
9886 | 10672 | 8711 | 7714 | 10852 | 9049 | 8490 | 7235 | 5595 | 2431 | 2338 | 1929 | 1538 | 1176 | 929 | 743 | 965 | 1044 | 410 | 669 | 553 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | glassy | glassy | on | cross |
High Tide | 9:59AM1.47m | 9:52PM1.64m | 11:18AM1.36m | 10:35PM1.58m | 1:18PM1.32m | 11:38PM1.53m | 3:21PM1.41m | 1:11AM1.52m | 4:29PM1.55m | 2:42AM1.58m | 5:14PM1.67m | 3:52AM1.69m | 5:51PM1.75m | ||||||||
Low Tide | 3:40PM0.78m | 4:44AM0.52m | 4:27PM0.97m | 6:00AM0.50m | 5:43PM1.14m | 7:33AM0.43m | 7:55PM1.22m | 8:57AM0.31m | 9:34PM1.16m | 10:02AM0.17m | 10:33PM1.05m | 10:55AM0.05m | 11:18PM0.92m | ||||||||
5:16 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | |
— | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | 3 | 8 | 8 | 9 | 15 | 1 | — | 4 | 1 | 3 | 7 | 1 | — | — | — | — | — |
Temp °C | 30 | 31 | 27 | 31 | 30 | 27 | 28 | 28 | 26 | 29 | 29 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 29 | 29 | 26 |
Feels °C | 32 | 33 | 30 | 33 | 31 | 31 | 31 | 30 | 28 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 30 | 32 | 32 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 16 | SE 16 | SE 15 | SE 14 | SE 14 | SSE 15 | SSE 14 | SSE 14 | SSE 13 | S 13 | SSW 13 | SSW 13 | SE 8 | SSW 14 | SSW 14 | SW 14 | SSW 13 | SSW 13 | S 12 | SSW 12 | SSW 11 |
9886 | 10672 | 8711 | 7714 | 8530 | 9049 | 8490 | 7235 | 5595 | 2431 | 2338 | 1929 | 485 | 1176 | 929 | 743 | 965 | 1044 | 373 | 669 | 553 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | E 15 | E 14 | SE 9 | SSW 14 | S 12 | E 13 | S 12 | E 12 | ESE 6 | SSW 12 | ESE 11 | ESE 12 |
— | — | — | — | — | — | — | — | — | 4 | 16 | 514 | 1468 | 396 | 272 | 273 | 110 | 82 | 410 | 198 | 140 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SE 16 | ESE 13 | E 13 | S 12 | SSE 7 | S 12 | E 12 | ESE 11 | SE 13 | SSE 13 |
— | — | — | — | — | — | — | — | — | — | — | 10 | 280 | 350 | 187 | 81 | 73 | 69 | 194 | 7 | 17 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SE 14 | — | — | E 10 | SE 10 | SE 10 | SE 9 | ESE 9 | E 13 | SE 7 | SE 7 | ESE 6 | SE 6 | — | — | — | SW 3 |
— | — | — | — | 10852 | — | — | 985 | 1652 | 1129 | 744 | 360 | 1538 | 254 | 227 | 142 | 201 | — | — | — | 5 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 22 | 510 | 0 | 22 | 459 | 57 | 475 | 459 | 459 | 475 | 475 | 57 | 459 | 459 | 503 | 369 | 1562 | 0 | 0 | 19 | 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.











