Surf Forecasts:
Asakawa surf forecast from 7 Aug 2026:
- Best quality surf: Saturday 8 Aug, 9PM (local time) - 5ft (1.5m), 11s period, SSW swell with glassy winds.
- Most powerful swell: Saturday 8 Aug, 12AM (local time) - 7ft (2.2m), 12s period, S swell with 1,321 kJ wave energy.
- Next surfable swell (1★+): Saturday 8 Aug, 9PM (local time) - 5ft (1.5m), 11s 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 08) at 9PM. The primary swell is predicted to be 1.5m and 11s period with a secondary swell of 1.3m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 2.2m 12s and forecast to arrive on Saturday (Aug 08) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Tuesday (Aug 11) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 8th Aug) | 5ft (1.5m) 11s |
| Best Surf | 9PM (Sat 8th Aug) | 5ft (1.5m) 11s |
| Most Powerful | 12AM (Sat 8th Aug) | 7ft (2.2m) 12s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's run through the same outlook but in feet and miles.
The water at Asakawa is 84°F, which is a touch warmer than usual for this time of year.
We've got a slow start, but things kick off on the afternoon of Friday, August 7th. A solid 13ft SSE swell rolls in with a 12-second period. That's a heap of power – the combined energy is a strong 3994. The wind is cross-onshore from the ESE at 9 mph, making it choppy. This one is for the experienced crew only, as it's well over 8ft.
The real standout is the morning of Wednesday, August 19th. That's the one you want to save. The swell is 8ft from the east with a 9-second period, and the combined energy is a very strong 1431. The wind is glassy from the ESE at just 3 mph, so the surface will be clean as a whistle. It's excellent for experienced surfers, and too big for beginners. That morning is the best on offer.
The days before that are a mixed bag of small, weak swells and onshore winds, but there are a few clean windows. On Monday, August 10th, the morning sees a glassy 4ft south swell with a 10-second period, though the energy is only moderate at 584. Tuesday, August 11th morning is clean with a 4ft south swell and a cross-offshore breeze, and the 11-second period gives it some shape. Wednesday, August 12th morning is also glassy, but the swell drops to 3ft.
After the 19th, the swell drops back and conditions become marginal again, with a lot of risk of thunderstorms and poor surf.
Because Asakawa is a point break and inconsistent, it tends not to stay flat for long, but the forecasts can change. The window from the 10th to the 12th has some small, clean options, and the 19th is the big one if you're up for a powerful session.
Rusty.
Short Range ForecastModerate rain (total 19mm), heaviest on Fri night. Warm (max 29°C on Sat afternoon, min 25°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 44mm), heaviest during Wed night. Warm (max 29°C on Tue morning, min 24°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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 12 | S 11 | S 11 | SSW 11 | SSW 12 | SSW 12 | SSW 12 | S 10 | S 10 | S 10 | SSW 10 | SSW 10 | SSW 11 | SSW 10 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 1321 | 792 | 629 | 439 | 384 | 384 | 486 | 257 | 196 | 255 | 270 | 281 | 297 | 231 | 240 | 184 | 163 | 125 | 113 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | glassy | cross-on | on | glassy | glassy | on | cross-off | cross-off | cross-on | cross-off | glassy | on | cross-on | cross-on | cross-on | off |
High Tide | 11:38PM1.53m | 3:21PM1.41m | 1:11AM1.52m | 4:29PM1.55m | 2:42AM1.58m | 5:14PM1.67m | 3:52AM1.69m | 5:51PM1.75m | 4:49AM1.80m | 6:24PM1.81m | 5:39AM1.88m | 6:54PM1.83m | |||||||
Low Tide | 7:33AM0.43m | 7:55PM1.22m | 8:57AM0.31m | 9:34PM1.16m | 10:02AM0.17m | 10:33PM1.05m | 10:55AM0.05m | 11:18PM0.92m | 11:39AM-0.00m | 11:58PM0.78m | 12:20PM0.01m | 00:35AM0.66m | |||||||
 |  |  | | | |  | | |  |  | |  |  | | |  | | | |
 | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — |
 | 6:58 | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | 11 | 5 | — | 1 | 1 | — | — | — | 1 | — | — | — | — | 1 | 6 | 20 | 9 | 8 | 17 |
Temp °C | 26 | 28 | 29 | 26 | 28 | 29 | 26 | 29 | 29 | 27 | 29 | 29 | 25 | 29 | 28 | 25 | 25 | 25 | 25 |
Feels °C | 30 | 31 | 32 | 32 | 31 | 32 | 31 | 33 | 32 | 32 | 32 | 31 | 28 | 32 | 31 | 29 | 28 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 11 | S 11 | SSW 11 | SSW 12 | SSW 12 | SSW 12 | S 10 | S 10 | S 10 | SSW 10 | SSW 10 | SSW 11 | SSW 10 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | ESE 5 |
| kJ | 1321 | 792 | 629 | 439 | 384 | 384 | 486 | 257 | 196 | 255 | 270 | 281 | 297 | 231 | 240 | 184 | 163 | 125 | 31 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 9 | SE 8 | SE 8 | E 13 | E 13 | ESE 13 | E 12 | E 12 | E 12 | ESE 11 | NE 4 | E 10 | S 11 | SE 13 | E 9 | E 6 | E 10 | SSW 9 |
| kJ | 845 | 515 | 327 | 191 | 350 | 339 | 286 | 193 | 141 | 98 | 41 | 6 | 19 | 21 | 26 | 15 | 26 | 16 | 113 |
Swell 3 Height (m) Direction Period (s) | — | SSW 15 | ESE 10 | ESE 10 | SE 8 | S 11 | S 11 | SW 11 | SW 11 | SW 12 | SE 13 | E 11 | SE 13 | SE 13 | E 10 | SE 12 | E 9 | SE 12 | E 10 |
| kJ | — | 85 | 71 | 133 | 110 | 181 | 87 | 126 | 130 | 47 | 27 | 37 | 27 | 27 | 8 | 24 | 14 | 22 | 7 |
Wind waves Height (m) Direction Period (s) | ESE 9 | — | — | — | — | SE 8 | — | — | — | NNE 3 | NE 5 | NNE 4 | N 3 | — | ESE 2 | ESE 5 | E 4 | ESE 5 | — |
| kJ | 465 | — | — | — | — | 107 | — | — | — | 3 | 18 | 13 | 6 | — | 1 | 60 | 16 | 39 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 19 | 43 | 19 | 0 | 19 | 19 | 0 | 0 | 11 | 0 | 0 | 22 | 0 | 0 | 19 | 43 | 43 | 19 | 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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