
Surf Forecasts:
Asakawa surf forecast from 20 Jul 2026:
- Best quality surf: Monday 27 Jul, 3AM (local time) - 3.5ft (1.0m), 11s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 27 Jul, 9AM (local time) - 4.5ft (1.3m), 12s period, S swell with 464 kJ wave energy.
- Next surfable swell (1★+): Friday 24 Jul, 12AM (local time) - 1ft (0.3m), 18s period with SE 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 24) at 12AM. The primary swell is predicted to be 0.3m and 18s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.2m and 3s is also forecast. Another secondary swell of 0.4m and 3s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.3m 12s and forecast to arrive on Monday (Jul 27) 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 0.3m 2s period and expected on Friday (Jul 24) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 24th Jul) | 1ft (0.3m) 18s |
| Best Surf | 3AM (Mon 27th Jul) | 3.5ft (1.0m) 11s |
| Most Powerful | 9AM (Mon 27th Jul) | 4.5ft (1.3m) 12s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, this is Rusty.
First off, let’s be straight with you. The next week or so is pretty flat and quiet around Asakawa. We’re looking at a long stretch of tiny, weak surf from the 20th right through the 24th. Swell heights are mostly around 0.7ft to 1ft, with energy readings in the low double digits to seventies, so there’s just nothing doing. The water temp is sitting at 83°, which is a touch warmer than normal for this time of year, but that’s small comfort when there’s no waves.
We get a slight bump on the morning of the 25th, with a 1ft SE swell showing up, period around 16 seconds, and moderate energy of 136. The wind is glassy, so it’ll be clean. But honestly, it’s still very small. The 26th morning is similar—1ft SE, period 15 seconds, 133 energy—but again, it’s nothing to get excited about.
Then things start to get real. The morning of the 27th brings a solid change. Swell jumps to 4ft from the S, period 12 seconds, and the energy is strong at 586. The wind is glassy, so it’ll be clean. This is a proper groundswell, and the longer period means better shaped waves, but with a point break setup, it should handle it well. This is the first real standout.
The 28th morning pushes up to 8ft from the S, with a very long period of 14 seconds. Energy is huge at 3622, but the wind is cross-on, so it’ll be a bit bumpy. At 8ft, this is getting into expert territory, especially with that long period, which can make beach breaks close out but a point like Asakawa should handle it. The afternoon is 12ft S, 15 seconds, energy at 5128, but wind is picking up to 12 mph cross-on, making it choppy.
The 29th morning is the biggest—15ft from the S, period 15 seconds, energy at 9173. Wind is cross-on at 6 mph, so it’s not perfect, but it’s still powerful. The afternoon goes to 16ft S, 15 seconds, energy at 11609, with wind at 12 mph cross-on, giving it moderate chop. This is huge, expert-only stuff.
The 30th morning is 21ft S, 14 seconds, energy at 14941, but wind is onshore at 12 mph, making it poor. The afternoon is 26ft from SSE, period 13 seconds, energy at a massive 37238, but the wind is fresh cross-on at 19 mph, and the swell is simply too big for the break. That’s a solid pass.
The 31st sees a drop to 10ft SE, period 11 seconds, energy 2066, with a clean cross-off wind from the north at 19 mph. That’s a strong wind, but it’s offshore, so it’ll be clean. This is still big, but a good option for experienced surfers.
From the 1st of August onward, it drops back to tiny, weak surf again, with poor conditions and no real recommendations.
So the standout here is the morning of the 27th. That 4ft S swell with glassy wind is your best bet for a fun, clean session. The 29th morning is also a standout for the big wave crew, with 15ft S and long period, though the cross-on wind is a bit of a buzzkill. If you’re an expert, the 31st morning with 10ft SE and clean offshore wind is also worth a look.
Signing off, Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Tue afternoon. Warm (max 31°C on Mon morning, min 27°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Sat afternoon. Warm (max 32°C on Thu morning, min 26°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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 9 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | ESE 11 | SE 10 | SE 10 | SE 18 | SE 18 | SE 18 | SE 16 | SE 16 | SE 16 | SE 16 | SE 15 | SE 11 | SSE 11 |
Wave Graph | |||||||||||||||||||||
31 | 12 | 12 | 11 | 23 | 22 | 22 | 11 | 11 | 25 | 25 | 50 | 49 | 49 | 42 | 91 | 90 | 86 | 78 | 76 | 194 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-off | glassy | cross-on | cross-off | glassy | cross-on | cross-off | glassy | cross-on | off | glassy | on | off | glassy | on | glassy | glassy | on | cross |
High Tide | 9:44AM1.49m | 10:10PM1.62m | 10:46AM1.35m | 10:42PM1.56m | 12:10PM1.25m | 11:21PM1.50m | 2:11PM1.24m | 00:16AM1.45m | 3:54PM1.32m | 1:31AM1.43m | 4:48PM1.42m | 2:45AM1.46m | 5:23PM1.50m | ||||||||
Low Tide | 3:45PM0.65m | 4:40AM0.66m | 4:20PM0.84m | 5:41AM0.66m | 5:01PM1.01m | 6:53AM0.64m | 6:12PM1.14m | 8:11AM0.59m | 8:12PM1.20m | 9:17AM0.51m | 9:41PM1.17m | 10:08AM0.41m | 10:33PM1.11m | ||||||||
5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:09 | — | — | |
— | 7:10 | — | — | 7:09 | — | — | 7:09 | — | — | 7:08 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | |
mm | — | 1 | — | — | 3 | — | 1 | 3 | — | — | — | 1 | — | — | — | 1 | 3 | 2 | 2 | 6 | 1 |
Temp °C | 31 | 31 | 28 | 31 | 31 | 28 | 30 | 31 | 28 | 32 | 32 | 28 | 32 | 32 | 29 | 31 | 31 | 27 | 29 | 29 | 27 |
Feels °C | 35 | 36 | 33 | 36 | 36 | 33 | 36 | 37 | 33 | 36 | 37 | 33 | 36 | 36 | 34 | 36 | 35 | 32 | 34 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | ESE 7 | ESE 7 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | ESE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SE 11 | SSE 11 |
31 | 10 | 9 | 11 | 23 | 22 | 22 | 11 | 11 | 25 | 25 | 25 | 23 | 14 | 41 | 40 | 50 | 49 | 50 | 71 | 194 | |
Swell 2 Height (m) Direction Period (s) | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSW 4 | SE 19 | SSW 3 | SE 18 | SE 18 | SE 16 | SE 16 | SE 16 | SE 16 | SE 15 | S 12 | SE 11 |
7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 1 | 15 | 1 | 49 | 49 | 42 | 91 | 90 | 86 | 78 | 75 | 55 | |
Swell 3 Height (m) Direction Period (s) | ESE 12 | ESE 11 | ESE 11 | ESE 6 | ESE 6 | SE 6 | SSW 3 | S 7 | SE 11 | SE 20 | S 8 | SE 18 | SSW 7 | ESE 11 | SSW 7 | S 8 | S 8 | S 8 | S 8 | SE 15 | SE 14 |
14 | 12 | 12 | 4 | 4 | 1 | 1 | 1 | 4 | 15 | 5 | 50 | 5 | 13 | 5 | 5 | 5 | 4 | 5 | 76 | 102 | |
Wind waves Height (m) Direction Period (s) | SW 8 | SSW 3 | SSW 3 | — | SW 2 | SW 3 | SW 3 | SSW 3 | SW 3 | — | SSW 4 | SW 3 | N 3 | — | WSW 2 | — | — | — | — | — | — |
14 | 3 | 1 | — | 1 | 1 | 2 | 1 | 3 | — | 1 | 4 | 1 | — | 1 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 511 | 30 | 30 | 352 | 30 | 30 | 357 | 293 | 6 | 433 | 0 | 0 | 11 | 0 | 0 | 19 | 0 | 0 | 11 | 2 |
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.










