
Surf Forecasts:
Asakawa surf forecast from 4 Aug 2026:
- Best quality surf: Wednesday 5 Aug, 6PM (local time) - 16ft (5.0m), 16s period, SE swell with glassy winds.
- Most powerful swell: Thursday 6 Aug, 12PM (local time) - 18ft (5.5m), 16s period, SE swell with 14,736 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 12AM (local time) - 13ft (4.0m), 16s period with ESE 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 12AM. The primary swell is predicted to be 4.0m 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 5.5m 16s and forecast to arrive on Thursday (Aug 06) at 12PM. 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+) | 12AM (Wed 5th Aug) | 13ft (4.0m) 16s |
| Best Surf | 6PM (Wed 5th Aug) | 16ft (5.0m) 16s |
| Most Powerful | 12PM (Thu 6th Aug) | 18ft (5.5m) 16s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s suss out what’s on the menu for Asakawa over the next couple of weeks.
We’re kicking off with a big, powerful pulse of swell that’s going to be a serious handful. The water’s sitting at a warm 85° – a touch warmer than normal for this time of year, so you can leave the steamer at home. This first run is for experienced crew only, and the wind is a real issue, making it messy. Things start to settle down for a brief window of proper glass, but then it fades out. It’s a tale of two halves.
Tuesday 4th August sees the first surf of the forecast, but it’s a tricky one. We’ve got a solid 10 ft swell from the ESE with a very long period of 16 seconds. The energy is massive (6633), but the wind is a light cross-on from the SE. That long-period groundswell will be trying to bend around the point, but the onshore kick will make it lumpy. Wednesday 5th gets even bigger with 15 ft to 16 ft of ESE/SE swell (energy pushing 11470) – that’s expert territory only. Cleaner cross-shore winds on Wednesday morning give a glimmer of hope, but the sheer size keeps it intimidating. This pattern holds through to Sunday 9th; the swell hangs around the 12 ft to 18 ft range, but every session is plagued by cross or cross-onshore winds, often with thunderstorms or rain. It’s a big, powerful, but messy setup.
Monday 10th is a write-off with poor conditions.
Then we get the moment. Tuesday 11th August morning. The swell drops to a much more manageable 6 ft from the S (period 12 seconds) and the wind goes glassy, coming from the ENE at just 6 mph. The energy is still moderate (2433), but the conditions are described as excellent for experienced surfers. This is the standout. The light offshore/glass makes it clean, and the holding power of a 12-second period on a point break like Asakawa should give some proper lines. The crowd factor is “sometimes” here, so you might have a few out, but for that quality, it’s worth it.
After that, the week goes quiet. Wednesday 12th and Thursday 13th mornings are glassy again but the swell is fading fast – down to 4 ft to 4 ft, with energy under 650. Nice for a longboard or a foiler, but not a lot of push. Friday 14th stays clean but small.
There’s a gap of a few days without much to get excited about before a new, short-period swell tries to build from the ESE on Saturday 15th August. It’s 8 ft but with a period of only 7-9 seconds, and the wind is cross-on from the SE. The energy is moderate (895-2072) but the short period means it’ll be lumpy and weak. This one runs through the weekend, but it’s marginal at best. By Monday 17th, it’s fading again.
The best bet is absolutely Tuesday 11th morning. Get on it before the swell dies.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Thu afternoon. Warm (max 31°C on Wed afternoon, min 25°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 81mm), heaviest during Sat night. Warm (max 29°C on Fri morning, min 26°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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 | ESE 17 | ESE 16 | ESE 16 | SE 16 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 16 | SSE 15 | S 15 | SSW 16 | SSW 16 | SSW 16 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 |
Wave Graph | |||||||||||||||||||||
4324 | 6358 | 8000 | 9886 | 11470 | 12049 | 14709 | 14248 | 13981 | 12060 | 9283 | 6533 | 5583 | 5534 | 6872 | 8001 | 6331 | 5861 | 4606 | 3214 | 2119 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | glassy | cross | cross-on | cross-off | cross | cross | cross-off | cross | cross-on | cross-off | cross | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | cross |
High Tide | 9:03AM1.58m | 9:19PM1.69m | 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 | ||||||||
Low Tide | 3:03PM0.60m | 3:47AM0.54m | 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 | ||||||||
5:16 | — | — | 5:16 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | |
— | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | |
mm | — | — | — | — | — | — | — | 2 | 4 | 5 | 5 | 7 | 6 | 10 | 26 | 9 | 6 | 7 | 2 | 2 | — |
Temp °C | 29 | 29 | 26 | 30 | 31 | 27 | 30 | 31 | 27 | 29 | 29 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 25 |
Feels °C | 32 | 31 | 30 | 32 | 33 | 30 | 31 | 32 | 30 | 31 | 31 | 30 | 30 | 29 | 28 | 28 | 27 | 27 | 26 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | ESE 16 | ESE 17 | ESE 16 | ESE 16 | SE 16 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 16 | SSE 15 | S 15 | SSW 16 | SSW 16 | SSW 16 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 |
4324 | 6358 | 8000 | 9886 | 11470 | 12049 | 14709 | 14248 | 13981 | 12060 | 9283 | 6533 | 5583 | 5534 | 6872 | 8001 | 6331 | 5861 | 4606 | 3214 | 2119 | |
Swell 2 Height (m) Direction Period (s) | ESE 19 | — | — | — | — | — | — | — | — | — | — | — | SE 9 | — | E 16 | ESE 13 | — | E 14 | — | — | SE 8 |
1802 | — | — | — | — | — | — | — | — | — | — | — | 1105 | — | 21 | 165 | — | 257 | — | — | 201 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 15 | — | — | E 13 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 9 | — | — | 84 | |
Wind waves Height (m) Direction Period (s) | E 8 | E 9 | — | — | — | — | — | — | — | — | — | SE 10 | — | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 8 |
507 | 846 | — | — | — | — | — | — | — | — | — | 1308 | — | 1416 | 1255 | 1429 | 1588 | 1601 | 1644 | 1476 | 310 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 19 | 459 | 0 | 22 | 245 | 0 | 22 | 475 | 494 | 459 | 459 | 0 | 459 | 459 | 459 | 494 | 459 | 1037 | 1569 | 1562 | 370 |
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.











