Surf Forecasts:
Asakawa surf forecast from 11 Jul 2026:
- Best quality surf: Sunday 12 Jul, 12AM (local time) - 13ft (4.0m), 16s period, SSW swell with cross-offshore winds.
- Most powerful swell: Sunday 12 Jul, 12AM (local time) - 13ft (4.0m), 16s period, SSW swell with 7,564 kJ wave energy.
- Next surfable swell (1★+): Sunday 12 Jul, 12AM (local time) - 13ft (4.0m), 16s 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 (Jul 12) at 12AM. The primary swell is predicted to be 4.0m and 16s period with a secondary swell of 0.3m and 12s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 4.0m 16s and forecast to arrive on Sunday (Jul 12) 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 0.5m 4s period and expected on Tuesday (Jul 14) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 12th Jul) | 13ft (4.0m) 16s |
| Best Surf | 12AM (Sun 12th Jul) | 13ft (4.0m) 16s |
| Most Powerful | 12AM (Sun 12th Jul) | 13ft (4.0m) 16s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
Alright folks, Rusty here. Let’s talk through the coming weeks.
We’ve got a few solid days lined up at Asakawa, but don’t get too comfortable—it fades fast after that. The first highlight is this Sunday morning, the 12th. We’re looking at clean 10ft SSW groundswell with a long 16-second period and glassy, off-the-chart conditions. The water’s sitting at 25°, a bit colder than usual for July, but that’s a small price to pay. The combined energy is pumping at 4895—that’s strong. The swell direction is SSE, and the optimum for this spot is SE, so it’s a solid match. This is a point break, and it’s inconsistent, so you’ll be waiting for sets, but when they come, they’ll be proper. Crowds are possible here, so get in early.
Saturday afternoon (the 11th) is a warm-up but not the best. You’re looking at 13ft SSW swell with a very long 17-second period, but the wind is cross-on at 9 mph from the south, making it choppy. The combined energy is huge at 8545, but the quality is marginal. That one’s for the experienced crew only—over 8ft and messy.
Sunday afternoon (the 12th) stays glassy with 8ft SSW swell, still very long period at 14 seconds, but keep an eye on the risk of thunderstorms. It’s still excellent for experienced surfers, though the energy drops to 2771.
Monday morning (the 13th) sees the swell drop to 5ft from the SSW, period easing to 12 seconds, and it’s glassy. Very good conditions but the energy is down to 706. After that, it’s a long, slow decline. From Tuesday onwards, the swell fades under 3ft and the period shortens—by Wednesday the 15th it’s basically gone. There’s a gap of poor, tiny surf from the 15th through the 17th.
A bit of hope returns on Saturday the 18th morning, with a clean 5ft ESE short-period swell (8 seconds) and clean cross-off wind at 9 mph from the NE. The energy is moderate at 412. But that’s about it—nothing to get excited over. By the 19th, it gets big again (8ft SE) but onshore and rainy—marginal at best. The rest of the week into the 25th and 26th is small, weak, and mostly onshore or glassy but tiny.
The standout is clearly Sunday morning the 12th at Asakawa—that’s your best window. Saturday the 18th morning is a distant second, but only if you’re desperate.
Stay safe, don’t sleep on that Sunday session.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sun afternoon. Warm (max 33°C on Tue afternoon, min 25°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Thu night. Warm (max 31°C on Wed morning, min 26°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Sat 18 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | ESE 10 | SE 10 | SSW 8 | SSW 8 | SSW 7 | SE 9 | SE 8 | ESE 14 | ESE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7564 | 4895 | 2763 | 1256 | 683 | 512 | 286 | 209 | 166 | 86 | 64 | 61 | 39 | 38 | 35 | 33 | 29 | 31 | 72 | 425 | 1665 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | glassy | cross-off | glassy | cross-on | off | cross-off | glassy | glassy | glassy | on | cross | on | on | glassy | cross-on | on | glassy | cross | cross-on |
High Tide | 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 | 8:36PM1.76m | 8:04AM1.75m | ||||||||
Low Tide | 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 | 1:58PM0.09m | 2:18AM0.73m | 2:36PM0.26m | |||||||
 |  |  | | | | |  | |  | | | | | |  | | | | | | |
 | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — |
 | 7:15 | — | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:12 |
mm | — | — | 1 | — | — | 2 | — | — | — | — | — | — | — | — | 1 | 2 | 2 | — | — | — | 2 |
Temp °C | 25 | 31 | 30 | 27 | 31 | 30 | 28 | 32 | 33 | 29 | 31 | 31 | 27 | 30 | 30 | 27 | 28 | 29 | 26 | 29 | 28 |
Feels °C | 29 | 35 | 36 | 32 | 35 | 35 | 33 | 36 | 38 | 34 | 35 | 35 | 31 | 33 | 35 | 33 | 32 | 33 | 30 | 33 | 33 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SE 9 | SE 8 | ESE 8 | ESE 12 |
| kJ | 7564 | 4895 | 2763 | 1256 | 683 | 512 | 286 | 209 | 166 | 86 | 64 | 61 | 39 | 38 | 35 | 33 | 29 | 31 | 72 | 142 | 1665 |
Swell 2 Height (m) Direction Period (s) | SE 12 | — | SE 15 | SE 10 | SE 10 | SE 10 | SE 12 | SE 12 | SE 12 | SE 11 | SE 11 | ESE 10 | ESE 10 | SE 10 | SE 9 | ESE 10 | ESE 10 | SW 6 | ESE 4 | ESE 14 | SSW 7 |
| kJ | 23 | — | 8 | 23 | 17 | 17 | 21 | 36 | 36 | 31 | 29 | 42 | 39 | 23 | 14 | 18 | 18 | 9 | 12 | 425 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | SE 11 | SE 13 | SE 13 | E 9 | E 9 | E 9 | SE 11 | SE 11 | S 8 | SE 11 | ESE 10 | ESE 10 | SE 10 | SE 10 | ESE 9 | SSW 7 | SSW 8 | — |
| kJ | — | — | — | 20 | 7 | 7 | 6 | 6 | 6 | 20 | 18 | 1 | 18 | 19 | 19 | 15 | 15 | 16 | 10 | 6 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | NE 3 | NE 4 | — | — | — | SW 3 | — | — | — | ESE 3 | SE 4 | ESE 4 | ESE 6 | — |
| kJ | — | — | — | — | — | — | — | 1 | 5 | — | — | — | 2 | — | — | — | 1 | 14 | 27 | 170 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19 | 19 | 0 | 19 | 343 | 0 | 6 | 385 | 0 | 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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