Surf Forecasts:
Asakawa surf forecast from 9 Jul 2026:
- Best quality surf: Saturday 11 Jul, 12AM (local time) - 13ft (4.0m), 17s period, S swell with glassy winds.
- Most powerful swell: Saturday 11 Jul, 6AM (local time) - 13ft (4.0m), 18s period, S swell with 10,388 kJ wave energy.
- Next surfable swell (1★+): Thursday 9 Jul, 9PM (local time) - 10ft (3.0m), 15s period with SSE 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 09) at 9PM. The primary swell is predicted to be 3.0m and 15s period with a secondary swell of 0.5m 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 4.0m 18s and forecast to arrive on Saturday (Jul 11) at 6AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Tuesday (Jul 14) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 9th Jul) | 10ft (3.0m) 15s |
| Best Surf | 12AM (Sat 11th Jul) | 13ft (4.0m) 17s |
| Most Powerful | 6AM (Sat 11th Jul) | 13ft (4.0m) 18s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
Alright, let’s talk about Asakawa. It’s the only game in town for the next 16 days, and it’s an inconsistent spot, so timing is everything.
Right now, we’re looking at a rough start. Thursday the 9th has some 8ft to 10ft swell from the SSE, but the wind is onshore and the energy is high (3506 to 3559), but the quality is just marginal. Not worth getting wet for.
The real standout is Saturday the 11th. The morning is looking killer. We’ve got a 13ft swell from the south, with a 17-second period that’s packing a ton of power – the combined energy is a massive 9878. The wind is a light breeze from the SSE, which is offshore here, so it’s going to be clean. This is a big swell for the intermediate crowd; it’s powerful, so you’ll need to be on your game. The water temp is sitting at 76°, which is a bit colder than normal for this time of year, so you might want a thicker suit.
Sunday the 12th afternoon is also a beauty. The swell drops to 8ft from the SSW, but the wind goes glassy. That’s a perfect combination for a point break. The period is 14 seconds, so it’s a proper groundswell with good shape. The energy is a moderate 2325, but the conditions are what make it magic.
After that, there’s a big gap. From Monday the 14th right through to the 18th, the surf really drops off. We’re talking about 1ft to 3ft dribble with poor conditions. It’s a proper flat spell, so don’t expect much.
Then, just when you think it’s done, the second week offers a couple of promising days. Monday the 20th morning has a glassy 8ft swell from the SE with a 14-second period, and the energy is solid at 2214. Excellent conditions for experienced surfers. Then Tuesday the 21st morning is another big one – 12ft from the SSE, glassy, with a 13-second period and energy of 3612. That’s a heavy, powerful swell, only for the experts. The wind is glassy, so it’ll be clean, but the size is serious.
The 24th Friday morning also looks good with a 6ft swell from the SSE, glassy, and a 12-second period. It’s a nice way to round out the window.
So, to wrap it up: the best of the best is Saturday the 11th morning – that’s the one to circle. The 12th afternoon and the 20th and 21st mornings are also standouts. The rest of the time is flat or poor. Be patient, and you’ll be rewarded.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu morning, min 23°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Sun night. Warm (max 29°C on Sun morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
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 15 | SSE 15 | SSE 15 | S 17 | S 16 | S 17 | S 17 | SSW 18 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | S 11 | SSW 11 | S 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | ESE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3009 | 3513 | 3640 | 6993 | 7220 | 9483 | 9878 | 10208 | 8777 | 4548 | 2318 | 1110 | 669 | 279 | 350 | 204 | 131 | 88 | 64 | 61 | 48 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | on | on | glassy | on | cross-on | cross | cross-on | glassy | glassy | glassy | glassy | off | cross | on | glassy | on | on | glassy |
High Tide | 1:20PM1.35m | 00:36AM1.58m | 3:00PM1.43m | 1:41AM1.60m | 4:18PM1.55m | 2:47AM1.65m | 5:16PM1.67m | 3:49AM1.73m | 6:04PM1.75m | 4:46AM1.81m | 6:47PM1.80m | 5:39AM1.86m | 7:26PM1.81m | ||||||||
Low Tide | 6:30PM0.98m | 7:54AM0.44m | 8:00PM1.08m | 9:03AM0.28m | 9:23PM1.10m | 10:04AM0.12m | 10:28PM1.08m | 10:59AM-0.01m | 11:22PM1.02m | 11:49AM-0.08m | 00:08AM0.95m | 12:35PM-0.09m | 00:52AM0.87m | ||||||||
 | |  |  | | | | | | |  |  |  |  | | | | | | |  | |
 | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — |
 | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 4 | 1 | 4 | — | 1 | 3 | — | — | — | 1 |
Temp °C | 27 | 27 | 24 | 27 | 27 | 25 | 27 | 27 | 25 | 29 | 28 | 26 | 27 | 28 | 26 | 29 | 28 | 26 | 27 | 27 | 25 |
Feels °C | 29 | 30 | 28 | 30 | 30 | 29 | 30 | 30 | 30 | 33 | 33 | 31 | 33 | 33 | 31 | 33 | 33 | 31 | 31 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SSE 15 | SSE 15 | SSE 15 | S 17 | S 16 | S 17 | S 17 | SSW 18 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | S 11 | SSW 11 | S 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | ESE 9 |
| kJ | 3009 | 3513 | 3640 | 6993 | 7220 | 9483 | 9878 | 10208 | 8777 | 4548 | 2318 | 1110 | 669 | 279 | 350 | 204 | 131 | 88 | 64 | 61 | 48 |
Swell 2 Height (m) Direction Period (s) | S 19 | E 8 | S 18 | — | — | — | — | — | — | SE 15 | E 9 | S 12 | SE 11 | SSW 12 | SE 12 | E 9 | SE 12 | ESE 8 | ESE 10 | ESE 9 | S 8 |
| kJ | 475 | 46 | 1129 | — | — | — | — | — | — | 8 | 7 | 103 | 18 | 184 | 35 | 14 | 36 | 14 | 31 | 33 | 35 |
Swell 3 Height (m) Direction Period (s) | ESE 8 | — | E 8 | — | — | — | — | — | — | — | — | SE 11 | E 9 | SE 10 | E 9 | SE 10 | E 8 | SE 12 | SE 11 | SE 10 | SE 10 |
| kJ | 22 | — | 34 | — | — | — | — | — | — | — | — | 29 | 6 | 17 | 6 | 15 | 12 | 21 | 18 | 17 | 15 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | E 6 | — | — | NNE 3 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 3 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 19 | 11 | 0 | 19 | 11 | 0 | 19 | 30 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 14 | 19 | 0 | 19 | 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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