Surf Forecasts:
Asakawa surf forecast from 16 Jul 2026:
- Best quality surf: Friday 17 Jul, 6AM (local time) - 2ft (0.6m), 7s period, SSW swell with offshore winds.
- Most powerful swell: Friday 24 Jul, 12AM (local time) - 1ft (0.3m), 18s period, SE swell with 50 kJ wave energy.
- Next surfable swell (1★+): Friday 17 Jul, 6AM (local time) - 2ft (0.6m), 7s 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 Friday (Jul 17) at 6AM. The primary swell is predicted to be 0.6m and 7s period with a secondary swell of 0.3m and 10s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 0.3m 18s and forecast to arrive on Friday (Jul 24) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 3s period and expected on Thursday (Jul 23) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Fri 17th Jul) | 2ft (0.6m) 7s |
| Best Surf | 6AM (Fri 17th Jul) | 2ft (0.6m) 7s |
| Most Powerful | 12AM (Fri 24th Jul) | 1ft (0.3m) 18s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here, and I’m not gonna sugarcoat it – the first week and a half is a real flat spell around these parts. Asakawa is a point break that rarely breaks, and for the first nine days, it’s barely showing a pulse. Tiny waves, weak energy, and mostly onshore or cross-onshore winds keep things flat and messy. A few mornings might be glassy, but the swell is just too small to ride.
The water temp is 81°, which is about 0.5° above normal – average for this time of year.
We finally see a pulse of energy building around Saturday, July 25th and Sunday, July 26th. The combined swell energy jumps from 160 (moderate) up to 1,092 (strong) by Sunday morning, with chest-to-head-high sets coming from the SE at around 5ft to 7ft. The period is a solid 15 seconds – a very long period groundswell. That’s great for a point break like Asakawa, but might be a bit straight for a beach. The wind is light cross-onshore Sunday morning, which is okay.
The real standout is Monday, July 27th through Tuesday, July 28th. On Monday morning, 7ft from the SSE with a 12-second period and energy of 1,535 – strong. The wind is light cross-onshore, but things get better Monday afternoon: 8ft, 13-second period, with a light cross-shore breeze – that’s the best combo for shape and clean conditions. Tuesday morning jumps to 10ft from the SSE, with a 14-second period and energy hitting 3,924 – very strong, and it’s gonna be a big, powerful swell. This is for experts only, way too big for beginners. The wind stays light cross-onshore.
After that, Wednesday the 29th brings 13ft from the S with onshore winds and a shorter period – it’ll be a messy, dumping mess, likely more for kite surfing than paddling. The weekend of August 1st drops off fast.
So, the best on offer is a short window: Monday the 27th afternoon and Tuesday the 28th morning at Asakawa. It’s a point break, so the long-period groundswell will wrap in nicely, but be ready for big waves and a crowd possible (it’s sometimes busy). This is a promising but less certain long-range call.
Stay patient.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Fri night. Warm (max 31°C on Fri morning, min 26°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Tue afternoon. Warm (max 31°C on Wed morning, min 26°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 10 | SW 7 | SE 10 | ESE 9 | E 9 | SE 8 | ESE 9 | ESE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | SE 10 | SE 10 | SE 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 18 | 16 | 14 | 15 | 13 | 24 | 17 | 17 | 20 | 16 | 16 | 16 | 39 | 23 | 22 | 22 | 11 | 11 | 16 | 26 | 50 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | glassy | on | on | cross-on | on | on | cross-on | cross-on | cross-on | glassy | glassy | cross-on | cross-off | glassy | on | cross-off | glassy | on | cross-off |
High Tide | 8:36PM1.76m | 8:04AM1.75m | 9:08PM1.72m | 8:52AM1.63m | 9:39PM1.67m | 9:44AM1.49m | 10:10PM1.62m | 10:46AM1.35m | 10:42PM1.56m | 12:10PM1.25m | 11:21PM1.50m | 2:11PM1.24m | 00:16AM1.45m | ||||||||
Low Tide | 1:58PM0.09m | 2:18AM0.73m | 2:36PM0.26m | 3:02AM0.69m | 3:11PM0.45m | 3:49AM0.67m | 3:45PM0.65m | 4:40AM0.66m | 4:20PM0.84m | 5:41AM0.66m | 5:01PM1.01m | 6:53AM0.64m | 6:12PM1.14m | ||||||||
 | |  |  | |  | | |  |  | | |  | | | | | | | | | |
 | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — |
 | — | 7:12 | — | — | 7:12 | — | — | 7:12 | — | — | 7:10 | — | — | 7:09 | — | — | 7:09 | — | — | 7:08 | — |
mm | — | — | 2 | 1 | 2 | 2 | — | 2 | — | — | — | — | 1 | 4 | 2 | — | 2 | — | — | 1 | 1 |
Temp °C | 31 | 31 | 27 | 30 | 29 | 27 | 29 | 29 | 27 | 30 | 29 | 27 | 29 | 30 | 27 | 31 | 31 | 28 | 31 | 31 | 28 |
Feels °C | 34 | 35 | 32 | 34 | 33 | 32 | 34 | 33 | 32 | 34 | 33 | 32 | 34 | 35 | 32 | 36 | 36 | 33 | 34 | 36 | 33 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | SW 7 | SE 10 | ESE 9 | SE 8 | SE 8 | SE 4 | ESE 9 | ESE 9 | SSE 4 | ESE 9 | ESE 9 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | SSE 7 | SE 10 | SE 10 | SE 10 |
| kJ | 18 | 11 | 14 | 15 | 11 | 24 | 9 | 17 | 16 | 6 | 16 | 16 | 39 | 23 | 22 | 22 | 11 | 5 | 16 | 26 | 16 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 9 | E 9 | SE 9 | E 9 | E 9 | SE 8 | SE 8 | SE 9 | ESE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SE 11 | SE 20 | SE 19 | SE 18 |
| kJ | 18 | 16 | 14 | 13 | 13 | 7 | 10 | 9 | 20 | 16 | 14 | 14 | 7 | 6 | 6 | 6 | 6 | 4 | 15 | 15 | 50 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SSW 8 | SSW 7 | SSW 6 | SSW 6 | SSW 6 | ESE 9 | ESE 12 | ESE 12 | SSE 9 | ESE 12 | ESE 11 | SSE 4 | SW 5 | SSW 3 | SW 4 | S 8 | ESE 11 | S 8 | S 8 | SSE 8 |
| kJ | 12 | 11 | 11 | 4 | 4 | 3 | 17 | 14 | 14 | 7 | 13 | 12 | 1 | 1 | 1 | 1 | 1 | 11 | 5 | 5 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | SE 3 | SE 3 | SE 3 | — | SE 4 | SSE 4 | — | S 4 | S 4 | — | — | SW 3 | — | — | WSW 2 | NNE 3 | — | — |
| kJ | — | — | — | 2 | 1 | 1 | — | 9 | 6 | — | 3 | 5 | — | — | 1 | — | — | 1 | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 336 | 43 | 293 | 475 | 30 | 30 | 30 | 2 | 30 | 30 | 6 | 6 | 30 | 289 | 30 | 433 | 289 | 282 | 522 | 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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