Surf Forecasts:
Asakawa surf forecast from 8 Aug 2026:
- Best quality surf: Sunday 9 Aug, 9AM (local time) - 4ft (1.2m), 12s period, SSW swell with glassy winds.
- Most powerful swell: Sunday 9 Aug, 9AM (local time) - 4ft (1.2m), 12s period, SSW swell with 384 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 9AM (local time) - 4ft (1.2m), 12s 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 Sunday (Aug 09) at 9AM. The primary swell is predicted to be 1.2m and 12s period with a secondary swell of 1.0m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.2m 12s and forecast to arrive on Sunday (Aug 09) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Tuesday (Aug 11) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sun 9th Aug) | 4ft (1.2m) 12s |
| Best Surf | 9AM (Sun 9th Aug) | 4ft (1.2m) 12s |
| Most Powerful | 9AM (Sun 9th Aug) | 4ft (1.2m) 12s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let me tell you what’s on the cards for Asakawa. Right now we’ve got a small window of decent surf, but don't get too excited just yet. The best bet lands on Sunday the 9th, but the rest of the stretch looks pretty average, with a few days that are best left alone.
The standout session is Sunday morning, 9th of August. Asakawa is a point break, so it can handle a bit of direction, and we’ve got a 4ft SSW groundswell with a nice long 12-second period. That’s proper groundswell, and it’s got good energy behind it (852 combined energy). The wind is glassy out of the southeast at just 3 mph. That’s as clean as it gets. The water is sitting at 84°, which is a touch warmer than normal for this time of year. It’s a good morning for an intermediate surfer to get some long, peeling lines. Crowds are possible here, so get in early.
Sunday afternoon the wind picks up a touch, and the conditions get a bit more marginal. Still the same swell, but it’s not quite as good.
Monday the 10th drops to 4ft, period shortens to 10 seconds, and the energy drops to 513. Winds are glassy in the morning, so it’s still surfable, but nothing to write home about.
From Tuesday the 11th through the middle of the week, we’re looking at waist-high waves, around 3ft, with cross-offshore or glassy winds, but the energy keeps dropping. By Thursday the 13th, it’s small and messy, with poor conditions and onshore wind. That stretch is not worth paddling out for.
Friday the 14th and Saturday the 15th stay small, with weak 2ft swell. The odd glassy morning might give you a few grovelly waves, but it’s ordinary.
Then from Sunday the 16th right through to the end of the period, it’s mostly tiny, weak surf, often with onshore or cross-onshore winds. A couple of glassy mornings pop up, but the swell is barely there. The best of that late stretch is Saturday the 22nd morning, when a 4ft S swell rolls in with an 11-second period and glassy conditions (439 combined energy). That’s the second best day, but it’s over two weeks away, so don’t bank on it.
Honestly, if you’re not out there Sunday morning the 9th, you’re waiting a long time for anything else worth chasing.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun afternoon. Warm (max 30°C on Sun morning, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 31mm), heaviest during Thu morning. Warm (max 28°C on Fri morning, min 22°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | SSW 12 | SSW 12 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 11 | SSW 10 | SSW 11 | S 10 | S 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | SE 10 | SE 10 | S 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 384 | 378 | 289 | 242 | 190 | 260 | 212 | 212 | 133 | 180 | 161 | 70 | 57 | 88 | 81 | 60 | 57 | 57 | 89 | 96 | 90 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | glassy | glassy | glassy | off | cross-off | cross-off | off | cross-off | glassy | cross | cross | cross-on | glassy | glassy | on | glassy | glassy | cross-on | glassy |
High Tide | 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 | 6:24AM1.90m | 7:22PM1.83m | 7:07AM1.87m | 7:49PM1.81m | ||||||||
Low Tide | 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 | 12:56PM0.09m | 1:12AM0.56m | 1:30PM0.22m | 1:48AM0.49m | ||||||||
 |  |  |  | |  |  | | | | |  | | | | | |  | | | | |
 | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — |
 | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — |
mm | — | 1 | — | 1 | 2 | — | — | — | — | — | — | 5 | 7 | 8 | 8 | — | 2 | 1 | — | 1 | 2 |
Temp °C | 30 | 29 | 26 | 29 | 29 | 26 | 30 | 30 | 24 | 27 | 27 | 25 | 25 | 25 | 24 | 28 | 27 | 25 | 29 | 29 | 25 |
Feels °C | 33 | 32 | 30 | 33 | 33 | 29 | 29 | 30 | 24 | 28 | 31 | 29 | 28 | 27 | 27 | 31 | 30 | 29 | 32 | 32 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 12 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 10 | SSW 11 | S 10 | S 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | SE 10 | SE 10 | S 10 |
| kJ | 384 | 378 | 289 | 242 | 190 | 260 | 212 | 212 | 90 | 180 | 161 | 70 | 57 | 88 | 81 | 60 | 57 | 57 | 89 | 96 | 90 |
Swell 2 Height (m) Direction Period (s) | ESE 13 | E 13 | ESE 13 | E 12 | E 12 | E 12 | E 11 | E 11 | SSW 11 | E 10 | S 10 | SSW 10 | SSW 10 | SE 12 | ESE 5 | E 9 | E 9 | E 4 | S 8 | S 10 | ESE 10 |
| kJ | 372 | 339 | 286 | 193 | 144 | 99 | 38 | 37 | 133 | 18 | 18 | 68 | 38 | 22 | 17 | 39 | 14 | 10 | 51 | 70 | 85 |
Swell 3 Height (m) Direction Period (s) | SSE 7 | S 11 | SSW 11 | SSW 11 | SSW 11 | SE 14 | SE 13 | SE 13 | E 10 | SE 13 | E 10 | ESE 4 | SE 12 | E 9 | E 9 | SE 11 | SE 11 | SSE 11 | E 10 | E 10 | ESE 12 |
| kJ | 96 | 181 | 219 | 78 | 76 | 31 | 28 | 27 | 33 | 27 | 8 | 7 | 23 | 7 | 6 | 20 | 19 | 47 | 31 | 33 | 46 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NNE 3 | NE 3 | NE 5 | NE 4 | NE 5 | NNE 4 | NE 3 | E 4 | E 4 | ESE 5 | — | — | ESE 5 | — | — | — | — |
| kJ | — | — | — | — | 2 | 3 | 10 | 23 | 13 | 1 | 2 | 17 | 8 | 17 | — | — | 9 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 43 | 19 | 385 | 0 | 0 | 2 | 0 | 0 | 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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