Surf Forecasts:
Asakawa surf forecast from 10 Jul 2026:
- Best quality surf: Saturday 11 Jul, 3AM (local time) - 13ft (4.0m), 17s period, S swell with glassy winds.
- Most powerful swell: Saturday 11 Jul, 6AM (local time) - 13ft (4.0m), 17s period, S swell with 8,927 kJ wave energy.
- Next surfable swell (1★+): Saturday 11 Jul, 3AM (local time) - 13ft (4.0m), 17s period with S 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 (Jul 11) at 3AM. The primary swell is predicted to be 4.0m and 17s 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 4.0m 17s and forecast to arrive on Saturday (Jul 11) at 6AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Tuesday (Jul 14) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sat 11th Jul) | 13ft (4.0m) 17s |
| Best Surf | 3AM (Sat 11th Jul) | 13ft (4.0m) 17s |
| Most Powerful | 6AM (Sat 11th Jul) | 13ft (4.0m) 17s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
Alright folks, Rusty here. Let’s talk about Asakawa.
The first few days are a write-off for paddle surfing. Friday the 10th, we get a big 12 ft S'ly swell with 15 km/h wind blowing straight onshore, making a choppy mess. The combined energy is huge at 7220, but it’s not for us. The water’s at 76°, which is about 3° colder than usual, so a bit of a shock.
Saturday the 11th is even bigger – 13 ft S'ly swell in the morning, energy at 8927, still onshore wind. Afternoon holds 13 ft from the SSW with 15 km/h wind. This is expert-only stuff way over 8 ft, and with those winds, it’s just ugly.
Sunday the 12th drops to 12 ft SSW with a light 5 km/h cross-onshore breeze, energy at 5296. Still messy. Afternoon sees 8 ft with thunderstorms – no good.
Monday the 13th is the first bright spot. Swell drops to 5 ft from the SSW with a long 12-second period, and the wind goes glassy in the morning. Energy is moderate at 778, but those clean, smooth conditions make this a great session for those who can wait. Afternoon holds 5 ft, glassy, energy 537. This is the one to hit early in the week.
From Tuesday the 14th through Friday the 17th, it’s all small and poor. Swell drops below 3 ft with onshore winds. A flat stretch of about four days.
Saturday the 18th stays flat, then Sunday the 19th sees a bump to 4 ft SSW with 13-second period, energy 753, but winds are cross-onshore. Not the best.
Now for the real gold. Thursday the 23rd of July, Asakawa gets a 6 ft ESE groundswell with a very long 13-second period, and a cross-offshore wind from the NE at 10 km/h. Clean conditions, energy at 1421. That long-period swell will wrap around the point beautifully, but beach breaks might see it peeling straight. Excellent for experts. The afternoon goes glassy with 6 ft, 12-second period, energy 1267. A full day of quality.
Friday the 24th of July brings 7 ft SE swell, 13-second period, cross-offshore winds – big and clean, energy at 1561. Afternoon is a bit smaller but still good. Saturday the 25th holds clean with 5 ft to 5 ft S'ly swell, cross-offshore winds, energy in the 800-900 range.
So, circle Monday the 13th for glassy smaller waves, or mark your calendar for Thursday the 23rd and Friday the 24th of July for the big, clean groundswell. Those are your standout days.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Sun night. Warm (max 31°C on Sun morning, min 24°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 31°C on Mon afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Fri 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | S 16 | S 17 | S 17 | SSW 17 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | ESE 8 | ESE 6 | ESE 8 | ESE 7 | E 9 | ESE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7220 | 7851 | 8927 | 8445 | 8574 | 5296 | 2870 | 1295 | 755 | 513 | 350 | 214 | 173 | 115 | 64 | 69 | 87 | 110 | 149 | 151 | 38 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | on | on | cross | cross-on | cross-on | cross-off | glassy | glassy | off | cross-off | on | on | on | on | glassy | on | on | cross-off | cross |
High Tide | 1:41AM1.60m | 4:18PM1.55m | 2:47AM1.65m | 5:16PM1.67m | 3:49AM1.73m | 6:04PM1.75m | 4:46AM1.81m | 6:47PM1.80m | 5:39AM1.86m | 7:26PM1.81m | 6:28AM1.88m | 8:02PM1.79m | 7:16AM1.84m | ||||||||
Low Tide | 8:00PM1.08m | 9:03AM0.28m | 9:23PM1.10m | 10:04AM0.12m | 10:28PM1.08m | 10:59AM-0.01m | 11:22PM1.02m | 11:49AM-0.08m | 00:08AM0.95m | 12:35PM-0.09m | 00:52AM0.87m | 1:18PM-0.04m | 1:35AM0.79m | ||||||||
 |  | | | |  |  |  | | |  | | | | | | | | | | | |
 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 |
 | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | 7:12 |
mm | — | — | — | — | — | — | 2 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 25 | 28 | 29 | 25 | 31 | 29 | 27 | 30 | 31 | 28 | 30 | 29 | 27 | 28 | 28 | 25 | 29 | 29 | 26 | 29 |
Feels °C | 31 | 29 | 31 | 32 | 29 | 34 | 33 | 32 | 34 | 37 | 33 | 34 | 33 | 32 | 31 | 32 | 30 | 31 | 31 | 29 | 32 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 17 | S 17 | SSW 17 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | ESE 6 | ESE 8 | ESE 7 | ESE 6 | ESE 7 |
| kJ | 7220 | 7851 | 8927 | 8445 | 8574 | 5296 | 2870 | 1295 | 755 | 513 | 350 | 214 | 173 | 115 | 64 | 62 | 87 | 110 | 96 | 34 | 38 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SE 12 | — | SE 11 | SE 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 12 | SE 11 | ESE 7 | SE 11 | SSW 8 | SSW 8 | SSW 8 | ESE 9 | ESE 9 |
| kJ | — | — | — | — | 23 | — | 40 | 31 | 17 | 17 | 24 | 24 | 22 | 31 | 26 | 18 | 40 | 22 | 22 | 26 | 25 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | E 9 | E 9 | SE 13 | SE 12 | SE 12 | E 9 | ESE 3 | SE 11 | — | SE 11 | — | ESE 10 | SSW 8 | SSW 8 |
| kJ | — | — | — | — | — | — | — | 15 | 6 | 7 | 6 | 23 | 7 | 1 | 29 | — | 18 | — | 10 | 13 | 12 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | NE 3 | E 4 | — | E 6 | ESE 8 | — | — | ESE 7 | E 9 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 2 | 6 | — | 39 | 69 | — | — | 149 | 151 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 11 | 2 | 11 | 19 | 2 | 19 | 14 | 0 | 0 | 0 | 0 | 0 | 245 | 14 | 11 | 369 | 0 | 4 | 11 | 0 | 22 |
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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