Surf Forecasts:
Asakawa surf forecast from 6 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, 6AM (local time) - 15ft (4.5m), 13s period, SE swell with 6,171 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 1.6m 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 4.5m 13s and forecast to arrive on Friday (Aug 07) at 6AM. 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 | 6AM (Fri 7th Aug) | 15ft (4.5m) 13s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s chew the fat on what Asakawa’s got cooking for the next couple of weeks.
It’s a slow start, no doubt. The first real surf hits on Friday the 7th, and it’s a beast, but it’s a messy beast. We’re talking a solid 13ft swell from the SSE with a 12-second period, carrying a massive amount of energy (4941), but the wind is blowing cross-on at 12 mph with thunderstorms in the mix. That’s a lot of power and a lot of chop. It’s a day for the experts or the kite surfers, not a relaxing paddle. The water’s a touch warmer than normal at 84°.
The swell drops back through the weekend, but the wind stays messy, keeping things choppy. By Monday morning the 10th, the energy drops way down to 610, but we get a moment of pure glass. The swell is a modest 4ft from the S at 10 seconds, but with flat calm wind, it’ll be clean. That’s the first real window for a decent session.
The standout window, and the best on offer across the whole forecast, falls on Wednesday the 12th. The morning is dead calm with a glassy 3ft swell from the SSW at 11 seconds. The energy is low (299), but the conditions will be perfect. The afternoon is the same story: glassy, 3ft, slightly less period. It’s not going to be big, but it’s going to be clean, and for a point break like Asakawa, that’s the best you can hope for.
After that, the surf drops off a cliff. From Thursday the 13th all the way through to Saturday the 22nd, it’s a long stretch of tiny, weak waves and poor conditions. You’ll see a few days with glassy mornings, like the 17th and 18th, but the swell is barely 2ft with low energy (134), so it’s strictly for the longboard or the foamie. The period stays short and weak, and the energy readings are mostly in the low 100s or even under 100, which is barely a ripple. The 22nd shows a small bump back up to 3ft, but it’s been a while and the wind is onshore, so it’s still a gamble.
Honestly, if you want a wave, lock in Wednesday the 12th. After that, you’re looking at a long flat spell. It’s the kind of run that’s normal for this area when the patterns shift, but don’t lose hope – forecasts can always change.
Rusty.
Short Range ForecastHeavy rain (total 30mm), 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 SummarySome drizzle, heaviest during Mon afternoon. Warm (max 30°C on Tue afternoon, 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 | SSW 11 | SSW 11 | ESE 13 | E 13 | E 13 | S 10 | S 11 | S 10 | SSW 11 | S 10 | SSW 12 | SSW 11 | SSW 10 | SSW 10 | S 9 | E 6 | E 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4687 | 3990 | 1444 | 930 | 657 | 439 | 367 | 339 | 272 | 302 | 220 | 249 | 370 | 164 | 174 | 254 | 236 | 170 | 87 | 95 | 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 | on | glassy | cross-off | cross | off | glassy | glassy | 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 | 14 | 1 | — | 1 | — | — | — | — | 1 | — | — | — | — | — | — | — | 6 | 4 | 18 |
Temp °C | 27 | 27 | 26 | 28 | 29 | 26 | 28 | 28 | 26 | 29 | 29 | 27 | 29 | 30 | 25 | 30 | 29 | 25 | 27 | 27 | 25 |
Feels °C | 30 | 30 | 29 | 30 | 31 | 31 | 31 | 31 | 31 | 33 | 33 | 32 | 30 | 33 | 28 | 32 | 32 | 27 | 30 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSE 12 | SSE 12 | S 12 | S 11 | SE 9 | SE 8 | SE 8 | E 13 | S 11 | S 10 | S 11 | S 10 | SSW 11 | S 10 | S 10 | SSW 11 | SSW 10 | SSW 10 | S 9 | SSW 9 | SSW 9 |
| kJ | 4687 | 3990 | 1444 | 930 | 492 | 257 | 151 | 339 | 240 | 302 | 220 | 249 | 370 | 164 | 174 | 254 | 236 | 170 | 87 | 90 | 86 |
Swell 2 Height (m) Direction Period (s) | E 16 | E 15 | E 15 | E 15 | SSW 11 | SSW 11 | ESE 13 | SE 8 | E 13 | E 12 | E 12 | E 11 | ESE 11 | SSW 11 | SSW 12 | E 10 | E 10 | E 10 | SSW 10 | ESE 6 | ESE 6 |
| kJ | 5 | 4 | 4 | 4 | 657 | 439 | 367 | 94 | 272 | 190 | 141 | 65 | 40 | 163 | 171 | 18 | 8 | 8 | 39 | 35 | 24 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | E 14 | ESE 9 | SSW 12 | SSW 12 | SE 7 | SW 12 | SW 12 | SW 12 | SE 13 | ESE 11 | E 10 | SE 13 | SE 13 | SE 12 | E 10 | SE 12 | E 9 |
| kJ | — | — | — | — | 16 | 115 | 243 | 243 | 69 | 118 | 116 | 72 | 27 | 39 | 18 | 27 | 26 | 24 | 8 | 22 | 13 |
Wind waves Height (m) Direction Period (s) | E 10 | — | SE 10 | SE 9 | — | — | — | SE 8 | — | — | — | — | NE 3 | NE 4 | NNE 4 | NE 4 | NE 3 | — | ESE 5 | E 6 | E 7 |
| kJ | 249 | — | 928 | 586 | — | — | — | 143 | — | — | — | — | 2 | 6 | 5 | 2 | 2 | — | 7 | 95 | 73 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 475 | 459 | 369 | 369 | 19 | 0 | 19 | 19 | 0 | 0 | 19 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 19 | 43 | 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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