Surf Forecasts:
Asakawa surf forecast from 30 Jul 2026:
- Best quality surf: Wednesday 5 Aug, 3PM (local time) - 20ft (6.0m), 18s period, SE swell with cross-onshore winds.
- Most powerful swell: Thursday 6 Aug, 6AM (local time) - 25ft (7.5m), 18s period, SE swell with 32,438 kJ wave energy.
- Next surfable swell (1★+): Saturday 1 Aug, 9PM (local time) - 1.5ft (0.4m), 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 Saturday (Aug 01) at 9PM. The primary swell is predicted to be 0.2m and 18s period with a secondary swell of 0.4m and 11s. Another secondary swell of 0.3m and 6s is also forecast. 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 7.5m 18s and forecast to arrive on Thursday (Aug 06) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Sunday (Aug 02) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 1st Aug) | 1.5ft (0.4m) 11s |
| Best Surf | 3PM (Wed 5th Aug) | 20ft (6.0m) 18s |
| Most Powerful | 6AM (Thu 6th Aug) | 25ft (7.5m) 18s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down what Asakawa's got in store for the next couple weeks.
First thing you gotta know: the water's sitting at a balmy 84°, which is a touch warmer than average for this time of year. Feels like a bath.
The next few days are a bit of a washout for paddling out. From Thursday the 30th through Saturday the 1st of August, we're looking at puny, weak dribbles. The swell is small, the period is short, and the conditions are poor. Just not worth the effort.
Now, there's a glimmer of hope on Sunday the 2nd. The morning brings a clean 2ft swell from the ESE with an 18-second period. That's a long-period groundswell, meaning proper lines. The wind is a light cross-offshore from the NNE, so it should be a bit lined up. The combined energy is moderate (323), and it gets better into the afternoon as the swell bumps up to 4ft with even more energy (626). This is the first window that looks surfable, but it's just a teaser.
The real standout, and the only time I'd get genuinely stoked, is on Wednesday the 5th of August. The morning session is the pick of the whole run. We've got an 18ft swell from the SE with a 17-second period. That's a massive, long-period groundswell. The combined energy is very strong (16633). The wind is a light cross-shore from the ENE, which is decent.
Now, here's the catch. This spot is a point break, and a point break with a swell this big and this long-period? It could handle it better than a beach break, but the data flags that it might be too big for this break. By the afternoon the swell hits 20ft and the wind gets more onshore, so it'll be a mess for the average surfer. This is a session for experts only. The crowd factor is listed as "sometimes", so you might have a few other heads out, but with swell that size, the lineup will be thinned out.
The waves are way too big for beginners from the 5th through the 7th. After that, it starts to drop, but the wind turns messy and onshore, so the quality goes with it. The runs around the 11th and 12th of August drop back down into the 4ft to 5ft range with glassy conditions on the mornings, but the energy is weak (less than 400), so you'll be waiting a long time for a set.
Overall, keep an eye on the 5th of August. That's the only real stand-out swell in this window, but it's a beast.
Rusty.
Short Range ForecastMostly dry. Warm (max 34°C on Sun morning, min 27°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Mon night. Warm (max 34°C on Sun afternoon, min 26°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Thu 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||
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 9 | SE 13 | SE 10 | SE 10 | SE 11 | SE 16 | ESE 18 | ESE 16 | ESE 15 | ESE 16 | ESE 18 | ESE 17 | ESE 18 | ESE 18 | ESE 17 | SE 18 | SE 18 | SE 18 |
Wave Graph  | ||||||||||||||||||||
 kJ | 23 | 23 | 24 | 26 | 23 | 28 | 29 | 64 | 174 | 612 | 644 | 1376 | 2552 | 3734 | 5392 | 7021 | 11546 | 16633 | 22986 | 28820 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | glassy | on | glassy | glassy | on | cross-off | cross-off | cross-off | off | cross | on | glassy | cross-on | on | glassy | cross | cross-on | cross-off |
High Tide | 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 | 9:59AM1.47m | 9:52PM1.64m | |||||||
Low Tide | 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 | 3:47AM0.54m | 3:40PM0.78m | ||||||||
 |  | | | | | | |  | | | | |  |  |  | | | | | |
 | — | — | 5:13 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — |
 | 7:04 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | — | — | — | — |
Temp °C | 32 | 29 | 33 | 32 | 28 | 33 | 32 | 29 | 34 | 34 | 30 | 31 | 31 | 27 | 30 | 31 | 27 | 31 | 31 | 27 |
Feels °C | 36 | 33 | 36 | 36 | 32 | 36 | 35 | 33 | 37 | 37 | 35 | 35 | 35 | 33 | 34 | 35 | 33 | 34 | 34 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | SE 11 | ESE 18 | ESE 16 | ESE 15 | ESE 16 | ESE 18 | ESE 17 | ESE 18 | ESE 18 | ESE 17 | SE 18 | SE 18 | SE 18 |
| kJ | 23 | 23 | 23 | 23 | 23 | 28 | 29 | 41 | 174 | 612 | 644 | 1376 | 2552 | 3734 | 5392 | 7021 | 11546 | 16633 | 22986 | 28820 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SSW 5 | SSW 5 | SSW 4 | SE 11 | SSW 4 | ESE 17 | SE 16 | ESE 14 | SSW 8 | SE 10 | S 8 | SSE 10 | ESE 5 | — | ESE 6 | — | — | — | — |
| kJ | 6 | 5 | 4 | 2 | 20 | 2 | 28 | 64 | 120 | 7 | 15 | 5 | 18 | 46 | — | 47 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SSW 4 | SSW 7 | SE 12 | SE 13 | SSW 5 | S 7 | S 4 | ESE 19 | SE 9 | SSW 8 | SSW 8 | E 14 | — | — | — | — | — | — | — | — |
| kJ | 2 | 5 | 24 | 26 | 2 | 1 | 1 | 35 | 29 | 7 | 6 | 16 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 3 | — | — | NNE 3 | — | NE 3 | NE 4 | — | — | ESE 5 | ESE 5 | ESE 6 | ESE 6 | — | — | — | — |
| kJ | — | — | — | 1 | — | — | 2 | — | 4 | 4 | — | — | 24 | 69 | 50 | 112 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 30 | 43 | 2 | 22 | 6 | 534 | 6 | 0 | 0 | 0 | 0 | 22 | 43 | 0 | 41 | 19 | 0 | 57 | 19 | 57 |
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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