Surf Forecasts:
Asakawa surf forecast from 7 Aug 2026:
- Best quality surf: Saturday 8 Aug, 9PM (local time) - 4.5ft (1.4m), 11s period, SSW swell with glassy winds.
- Most powerful swell: Friday 7 Aug, 6PM (local time) - 11ft (3.5m), 12s period, SSE swell with 3,707 kJ wave energy.
- Next surfable swell (1★+): Saturday 8 Aug, 9PM (local time) - 4.5ft (1.4m), 11s 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 Saturday (Aug 08) at 9PM. The primary swell is predicted to be 1.4m and 11s period with a secondary swell of 1.3m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 3.5m 12s and forecast to arrive on Friday (Aug 07) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Tuesday (Aug 11) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 8th Aug) | 4.5ft (1.4m) 11s |
| Best Surf | 9PM (Sat 8th Aug) | 4.5ft (1.4m) 11s |
| Most Powerful | 6PM (Fri 7th Aug) | 11ft (3.5m) 12s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s shaping up for Asakawa over the next couple of weeks.
Honestly, this outlook is a bit of a heartbreaker for anyone looking to get a proper wave. The good news is, there’s some serious swell on the way, but the bad news is, the wind just won’t play nice for most of it. The biggest pulse of energy hits early on, with a solid 13ft SE groundswell coming through on Friday morning, packing a ton of energy (9885). That’s a proper slug of swell, but with a 12-second period and a cross-onshore Easterly breeze at 12 mph, it’s going to be a choppy, bumpy mess at Asakawa. The water is sitting at 84°, which is a touch warmer than normal for this time of year, so at least you won’t be cold while you’re getting frustrated.
Friday the 7th of August sees that big swell drop slightly to 12ft in the afternoon, but the wind stays cross-onshore, so it’s still a fight. The next couple of days, Saturday the 8th and Sunday the 9th, see the swell drop fast, but the wind stays on it or cross-onshore, keeping everything messy. There’s a window of glassy conditions on Monday morning the 10th, but the swell has dropped to a tiny 4ft S swell with a modest 10-second period and very weak energy (574). It’s surfable, but you’ll be scratching for something to ride.
The standout, if you can call it that, is likely Tuesday the 11th. The morning offers a clean, cross-offshore breeze from the NNE at 6 mph on a 4ft SSW swell, and the afternoon goes completely glassy with a 3ft S swell. The energy is dropping fast (368), but those conditions will be the cleanest of the entire forecast. For a point break like Asakawa, that’s your best bet for a smooth, longboard-style session.
After that, it’s a long, slow fade. From Wednesday the 12th onwards, the swell drops below 3ft and the winds get messy again. There’s a few glassy mornings on the 15th, 17th, and 18th, but the swell is barely a ripple. The 19th and 20th offer a cleaner cross-offshore breeze again, but again, the swell is tiny and weak. Honestly, after that Tuesday, you’re looking at a solid week of marginal conditions. Kite surfers might get a look in on the bigger, windier days, but for paddle surfing, it’s a waiting game.
So, if you’re chasing the biggest swell, Friday the 7th is the day to get out there, but take a bigger board and be ready for a bumpy ride. For the best quality waves, aim for Tuesday the 11th. Everything else is a gamble.
Rusty.
Short Range ForecastHeavy rain (total 26mm), heaviest during Fri night. Warm (max 29°C on Sat afternoon, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Wed night. Warm (max 30°C on Tue morning, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | |||||||||||||||
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) | SSE 12 | SSE 12 | S 12 | S 11 | S 11 | SSW 11 | ESE 13 | E 13 | ESE 13 | S 10 | S 10 | S 11 | SSW 11 | S 11 | SW 12 | S 10 | S 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 5198 | 3806 | 1321 | 792 | 629 | 366 | 367 | 339 | 286 | 244 | 218 | 184 | 314 | 184 | 138 | 127 | 127 | 170 | 128 | 118 | 86 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | glassy | cross-on | on | glassy | glassy | glassy | cross-off | cross-off | glassy | cross-off | glassy | cross-on | glassy | cross-on | on | glassy |
High Tide | 1:18PM1.32m | 11:38PM1.53m | 3:21PM1.41m | 1:11AM1.52m | 4:29PM1.55m | 2:42AM1.58m | 5:14PM1.67m | 3:52AM1.69m | 5:51PM1.75m | 4:49AM1.80m | 6:24PM1.81m | 5:39AM1.88m | 6:54PM1.83m | ||||||||
Low Tide | 5:43PM1.14m | 7:33AM0.43m | 7:55PM1.22m | 8:57AM0.31m | 9:34PM1.16m | 10:02AM0.17m | 10:33PM1.05m | 10:55AM0.05m | 11:18PM0.92m | 11:39AM-0.00m | 11:58PM0.78m | 12:20PM0.01m | 00:35AM0.66m | ||||||||
 | |  | |  |  |  | | | | |  | | | |  | |  | | | | |
 | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — |
 | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | 7 | 7 | 10 | 2 | — | — | — | — | — | — | 3 | — | — | — | — | 1 | 2 | 7 | 5 | 2 | 2 |
Temp °C | 27 | 27 | 26 | 28 | 29 | 26 | 29 | 29 | 26 | 29 | 28 | 26 | 30 | 30 | 25 | 27 | 25 | 24 | 26 | 28 | 25 |
Feels °C | 30 | 30 | 29 | 31 | 31 | 31 | 32 | 33 | 31 | 33 | 33 | 30 | 33 | 34 | 28 | 30 | 28 | 28 | 29 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SSE 12 | SSE 12 | SE 10 | SE 9 | S 11 | SSW 11 | ESE 13 | E 13 | S 11 | S 10 | S 10 | S 11 | SSW 11 | S 11 | S 10 | S 10 | S 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 |
| kJ | 4687 | 3806 | 979 | 550 | 629 | 366 | 367 | 339 | 231 | 244 | 218 | 184 | 314 | 184 | 138 | 127 | 127 | 170 | 128 | 118 | 86 |
Swell 2 Height (m) Direction Period (s) | — | E 15 | S 12 | S 11 | SE 8 | SE 8 | SE 8 | SSW 12 | ESE 13 | E 12 | E 12 | SW 12 | E 11 | SW 12 | SW 12 | SSW 11 | SSW 11 | E 10 | ESE 4 | ESE 6 | E 12 |
| kJ | — | 4 | 1321 | 792 | 330 | 196 | 119 | 239 | 286 | 190 | 141 | 112 | 62 | 147 | 135 | 109 | 82 | 7 | 6 | 6 | 71 |
Swell 3 Height (m) Direction Period (s) | — | — | — | SSW 14 | ESE 10 | ESE 10 | SSW 12 | SE 8 | SSW 11 | SW 12 | SW 12 | E 12 | SE 13 | E 11 | E 10 | E 10 | E 10 | SE 12 | E 10 | E 10 | ESE 4 |
| kJ | — | — | — | 118 | 71 | 72 | 235 | 71 | 84 | 140 | 114 | 95 | 27 | 37 | 19 | 8 | 18 | 24 | 8 | 18 | 8 |
Wind waves Height (m) Direction Period (s) | SE 12 | — | ESE 9 | — | — | — | — | — | — | — | — | N 3 | NE 4 | NNE 4 | — | NNE 3 | — | SE 3 | E 4 | E 5 | — |
| kJ | 5198 | — | 660 | — | — | — | — | — | — | — | — | 5 | 10 | 13 | — | 4 | — | 3 | 14 | 28 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 475 | 459 | 369 | 43 | 19 | 0 | 19 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 43 | 0 | 43 | 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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