Surf Forecasts:
Asakawa surf forecast from 29 Jul 2026:
- Best quality surf: Wednesday 5 Aug, 3PM (local time) - 20ft (6.0m), 18s period, SE swell with cross-shore winds.
- Most powerful swell: Wednesday 5 Aug, 9PM (local time) - 21ft (6.5m), 18s period, SE swell with 24,082 kJ wave energy.
- Next surfable swell (1★+): Thursday 30 Jul, 12AM (local time) - 1.5ft (0.5m), 10s 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 Thursday (Jul 30) at 12AM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.4m and 5s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 6.5m 18s and forecast to arrive on Wednesday (Aug 05) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Monday (Aug 03) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 30th Jul) | 1.5ft (0.5m) 10s |
| Best Surf | 3PM (Wed 5th Aug) | 20ft (6.0m) 18s |
| Most Powerful | 9PM (Wed 5th Aug) | 21ft (6.5m) 18s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let’s dig into this one. The first stretch is a total flat spell. Starting Wednesday July 29th, and running right through the end of the month into early August, Asakawa is offering nothing. Tiny, weak, and poor – you’re looking at about four days of absolute zero.
Things perk up on the morning of Sunday August 2nd. A little bump of swell, 2ft from the ESE, with a 15-second period and combined energy of 218 (moderate). The wind is a light offshore from the NE at 3 mph, keeping things clean. It’s surfable, but nothing to write home about. By the afternoon, the swell pushes to 3ft from the same direction, still with that long 15-second period. Energy jumps to 480. Winds stay light and cross-off, making for a decent little window.
From Monday August 3rd, the real power shows up. Monday morning brings 6ft from the ESE with a 17-second period – very long period groundswell – and energy at 1579 (strong). Winds are light and cross-shore (ENE at 6 mph). By Monday afternoon, you’re looking at 7ft, but the wind goes onshore, so the quality drops.
The main event is Wednesday August 5th. Tuesday the 4th already shows big numbers – 10ft from the ESE, 18-second period, energy around 6000 – but Wednesday morning is the one. You’ve got 16ft from the SE, 18-second period, and the combined energy is 15075 – very strong, very powerful. The wind is a gentle cross-shore from the ENE at 9 mph, keeping the surface clean. This is strictly for experts – no beginners allowed. The swell direction (SE) lines up perfectly with the optimum for this spot. Water temp is about 82°, which is normal for this time of year. Asakawa is an inconsistent break, so when it decides to fire like this, you get on it. Crowds only show up sometimes, so you might have a bit of room.
Wednesday afternoon gets even bigger – nearly 20ft from the SE – but it’s flagged as too large for this break altogether.
The swell sticks around but slowly fades through the rest of the week and into the weekend. By Monday August 10th, we’re down to 5ft from the SSW, with energy at 1141 (moderate) and light onshore wind. Tuesday morning the 11th offers a glassy window with 4ft from the SSW and a 12-second period – clean but small.
After that, it turns back into small, weak junk. The last couple of days show a short-period windswell (7 seconds) that’s not worth paddling for.
The bottom line: Wednesday August 5th is your day. Big, clean, and powerful. If you’re good enough, you’re in for a session to remember.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Wed afternoon. Warm (max 33°C on Thu morning, min 27°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon night. Warm (max 34°C on Sun afternoon, min 27°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Wed 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | ||||||||||||||
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) | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | ESE 17 | ESE 15 | ESE 15 | ESE 16 | ESE 17 | ESE 18 | ESE 17 | ESE 18 | ESE 17 | ESE 18 |
Wave Graph  | ||||||||||||||||||||
 kJ | 48 | 47 | 23 | 23 | 23 | 24 | 23 | 23 | 28 | 29 | 112 | 184 | 462 | 793 | 1534 | 2552 | 2993 | 5454 | 6863 | 10262 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | glassy | on | glassy | glassy | cross-on | glassy | glassy | cross-on | off | cross-off | cross-off | cross-off | cross | on | glassy | cross-on | cross-on | glassy |
High Tide | 6:46PM1.68m | 5:48AM1.74m | 7:11PM1.71m | 6:24AM1.77m | 7:36PM1.73m | 7:00AM1.77m | 8:00PM1.74m | 7:37AM1.73m | 8:25PM1.74m | 8:17AM1.67m | 8:51PM1.72m | 9:03AM1.58m | 9:19PM1.69m | |||||||
Low Tide | 00:13AM0.89m | 12:32PM0.15m | 00:44AM0.81m | 1:02PM0.16m | 1:15AM0.74m | 1:31PM0.21m | 1:47AM0.67m | 2:00PM0.31m | 2:22AM0.61m | 2:31PM0.44m | 3:01AM0.57m | 3:03PM0.60m | ||||||||
 |  |  |  |  | | | | | | | | | | | |  | | | | |
 | — | — | 5:11 | — | — | 5:13 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — |
 | 7:05 | — | — | 7:04 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — |
mm | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | — |
Temp °C | 32 | 29 | 33 | 33 | 29 | 33 | 32 | 28 | 33 | 33 | 29 | 33 | 34 | 30 | 31 | 31 | 27 | 29 | 30 | 27 |
Feels °C | 36 | 33 | 36 | 37 | 34 | 36 | 36 | 32 | 36 | 37 | 33 | 35 | 37 | 34 | 34 | 35 | 33 | 34 | 34 | 32 |
Swell 1 Height (m) Direction Period (s) | S 8 | SSW 5 | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | ESE 17 | ESE 15 | ESE 15 | ESE 16 | ESE 17 | ESE 18 | ESE 17 | ESE 18 | ESE 17 | ESE 18 |
| kJ | 32 | 11 | 23 | 23 | 23 | 23 | 23 | 23 | 28 | 29 | 112 | 184 | 462 | 793 | 1534 | 2552 | 2993 | 5454 | 6863 | 10262 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SSW 5 | SSW 8 | SSW 5 | SSW 5 | NE 3 | SE 11 | SSW 4 | ESE 17 | SE 11 | SE 9 | SE 10 | SE 10 | S 8 | SSE 10 | ESE 6 | — | — | — |
| kJ | 48 | 47 | 5 | 11 | 2 | 4 | 2 | 20 | 2 | 28 | 41 | 29 | 17 | 15 | 5 | 9 | 62 | — | — | — |
Swell 3 Height (m) Direction Period (s) | SE 13 | SSW 8 | SSW 8 | SE 12 | SSW 7 | SE 12 | SSW 4 | S 7 | S 7 | S 4 | SW 5 | SE 11 | S 8 | SSW 8 | E 15 | — | — | — | — | — |
| kJ | 26 | 11 | 6 | 6 | 5 | 24 | 2 | 4 | 1 | 1 | 1 | 5 | 1 | 6 | 17 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNE 3 | WSW 2 | — | ENE 3 | SW 5 | NNE 3 | NNE 4 | — | E 4 | ESE 6 | — | — | ESE 6 | — |
| kJ | — | — | — | — | — | — | 2 | 1 | — | 1 | 7 | 1 | 7 | — | 23 | 39 | — | — | 94 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1 | 0 | 30 | 30 | 43 | 2 | 581 | 6 | 581 | 433 | 0 | 0 | 0 | 0 | 22 | 43 | 0 | 24 | 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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