Surf Forecasts:
Asakawa surf forecast from 17 Jul 2026:
- Best quality surf: Tuesday 21 Jul, 3AM (local time) - 1.5ft (0.5m), 11s period, SE swell with glassy winds.
- Most powerful swell: Tuesday 21 Jul, 3AM (local time) - 1.5ft (0.5m), 11s period, SE swell with 58 kJ wave energy.
- Next surfable swell (1★+): Tuesday 21 Jul, 3AM (local time) - 1.5ft (0.5m), 11s 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 Tuesday (Jul 21) at 3AM. The primary swell is predicted to be 0.5m and 11s period with a secondary swell of 0.2m and 8s. Another secondary swell of 0.4m and 3s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 0.5m 11s and forecast to arrive on Tuesday (Jul 21) at 3AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 2s period and expected on Wednesday (Jul 22) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 21st Jul) | 1.5ft (0.5m) 11s |
| Best Surf | 3AM (Tue 21st Jul) | 1.5ft (0.5m) 11s |
| Most Powerful | 3AM (Tue 21st Jul) | 1.5ft (0.5m) 11s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, this is Rusty checking in. Let’s be straight with you: the next week and a half is a write-off for Asakawa. Tiny, weak, onshore slop with barely any energy. You’re looking at a solid 9-day gap with no surf worth paddling for. The first real chance of a wave doesn’t show up until Sunday the 26th, and even then it’s a marginal call.
Come Sunday morning the 26th, Asakawa starts to see a pulse of life with a 3 ft swell from the SE at 14 seconds. The combined energy is moderate (374), but the wind is straight onshore, so it’s messy. Not the day to get excited.
The real standout for this whole forecast is Monday the 27th morning. The swell jumps to 8 ft from the SSE with a 13-second period, and the combined energy is strong (1921). The wind is light cross-onshore, so it’s not perfect, but it’s the best size and energy we’ll see all week. The water is a warm 81°, which is about average for this time of year. This is a big, powerful point break wave, but at 8 ft on the afternoon, it’s really only for the experienced crew. Beginners will want to sit this one out.
The wave keeps building into Tuesday the 28th and Wednesday the 29th, with 12 ft to 13 ft from the S and SSE, but the wind stays cross-onshore, which will chop it up. The energy is extreme (5376 to 7062), but the quality is compromised. For a point break, this long period groundswell (15-16 seconds) will line up nicely, but with the wind, it’s going to be a battle.
By the 1st of August, the swell drops back to 7 ft from the SE, but the period (8 seconds) is short and weak, and the wind is still onshore. It’s a fade-out.
So, bottom line: don’t bother until the 27th. Monday morning the 27th is your best shot for size and power, but it’s a big, windy day for strong paddlers only. Keep an eye on the wind, but the window is narrow.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri night. Warm (max 31°C on Mon morning, min 26°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Tue afternoon. Warm (max 31°C on Wed morning, min 27°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | ||||||||||||||
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) | SW 7 | SE 10 | ESE 9 | E 9 | SE 8 | ESE 9 | ESE 10 | SE 9 | SE 9 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | ESE 11 | SE 9 | SE 10 | SE 18 |
Wave Graph  | ||||||||||||||||||||
 kJ | 16 | 14 | 15 | 13 | 24 | 17 | 18 | 20 | 38 | 12 | 47 | 46 | 46 | 22 | 22 | 11 | 11 | 14 | 25 | 50 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | on | on | cross-on | on | on | cross | cross-on | cross-on | glassy | glassy | cross-on | cross-off | glassy | on | cross-off | glassy | on | glassy |
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 | 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 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — |
 | 7:12 | — | — | 7:12 | — | — | 7:12 | — | — | 7:10 | — | — | 7:09 | — | — | 7:09 | — | — | 7:08 | — |
mm | 1 | 2 | — | 1 | — | — | — | — | — | — | — | 3 | 4 | 3 | — | 2 | 1 | — | 2 | 2 |
Temp °C | 30 | 27 | 30 | 29 | 27 | 30 | 30 | 27 | 31 | 30 | 27 | 30 | 30 | 27 | 31 | 31 | 28 | 31 | 31 | 28 |
Feels °C | 34 | 33 | 34 | 33 | 33 | 33 | 34 | 32 | 35 | 34 | 32 | 36 | 35 | 32 | 35 | 36 | 33 | 35 | 36 | 33 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SE 10 | ESE 9 | SE 8 | SE 8 | SE 5 | SE 5 | SE 4 | SE 9 | ESE 7 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | ESE 11 | SE 9 | SE 10 | SE 10 |
| kJ | 11 | 14 | 15 | 11 | 24 | 7 | 8 | 6 | 38 | 10 | 47 | 46 | 46 | 22 | 22 | 11 | 11 | 14 | 25 | 25 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | E 9 | SE 9 | E 9 | SE 3 | SE 8 | ESE 10 | ESE 9 | SE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SE 11 | SSW 8 | SE 19 | SE 18 |
| kJ | 16 | 14 | 13 | 13 | 2 | 10 | 18 | 16 | 12 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 4 | 6 | 15 | 50 |
Swell 3 Height (m) Direction Period (s) | S 8 | SSW 7 | SSW 7 | SSW 6 | E 9 | ESE 9 | SE 8 | SE 9 | ESE 12 | ESE 11 | SW 4 | S 7 | SW 8 | SSW 2 | SW 7 | S 8 | SE 8 | ESE 10 | S 7 | SSE 8 |
| kJ | 10 | 11 | 4 | 4 | 7 | 17 | 9 | 20 | 14 | 12 | 1 | 1 | 2 | 1 | 2 | 1 | 2 | 10 | 4 | 7 |
Wind waves Height (m) Direction Period (s) | — | ESE 3 | ESE 3 | SE 3 | — | — | — | — | SSE 4 | S 4 | SSW 3 | — | — | SW 3 | — | — | — | — | — | — |
| kJ | — | 1 | 1 | 3 | — | — | — | — | 3 | 2 | 2 | — | — | 3 | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 343 | 6 | 64 | 475 | 30 | 30 | 30 | 14 | 11 | 30 | 1 | 1 | 30 | 282 | 289 | 433 | 293 | 289 | 563 | 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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