Surf Forecasts:
Asakawa surf forecast from 8 Jul 2026:
- Best quality surf: Saturday 11 Jul, 3AM (local time) - 13ft (4.0m), 18s period, S swell with glassy winds.
- Most powerful swell: Saturday 11 Jul, 12PM (local time) - 13ft (4.0m), 17s period, S swell with 9,765 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 17s and forecast to arrive on Saturday (Jul 11) at 12PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 9th Jul) | 10ft (3.0m) 15s |
| Best Surf | 3AM (Sat 11th Jul) | 13ft (4.0m) 18s |
| Most Powerful | 12PM (Sat 11th Jul) | 13ft (4.0m) 17s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
Alright, Rusty here. Let's have a look at what's coming our way.
First things first, the water at Asakawa is sitting at 76°, which is about two and a half degrees colder than what we'd normally expect this time of year. It's a bit nippy, so you might want an extra mil of rubber.
The next week and a half is a bit of a mixed bag, but we do have a couple of solid windows. The surf really starts to kick in from Thursday morning, July 9th, with a solid 8ft SSE swell pushing in, but it's onshore and a bit messy. It's not the cleanest, but the energy is ramping up (combined energy of 3506). The real standout comes on Saturday, July 11th. We're looking at a pumping 13ft swell from the S, with a long 17-second period – that's proper groundswell. The wind is light and onshore, but it's manageable. This is the best of the first week, and the wave energy is huge (9677). Keep in mind, with that size and period, it's going to be a handful for beginners, and it's likely to be a bit shifty at the points, but for the experienced crew, it's going to be a ripper. The crowds are likely here, so get in early.
Things drop off pretty quickly after that. Sunday afternoon gets choppy, and from Monday, July 13th, through to the end of the following week, it's a long, flat spell. There's a glassy 5ft morning on the 13th, but it's a shadow of the weekend. The energy drops to 714, and the conditions are just ordinary. We're looking at a solid gap of very average surf until the 20th.
Then, the second week looks promising again. Monday, July 20th, starts to build again, but it's the morning of Tuesday, July 21st, that's the real long-range standout. It's still a week and a half away, so don't book the time off yet, but the forecast is for an 12ft SE swell, clean and glassy (combined energy of 4787). That's a long-period groundswell from the east, which is going to wrap really nicely into the point. It's expert territory at that size, but the conditions are set to be excellent. That morning session is the one to circle on the calendar. The following Wednesday and Thursday mornings also hold good, glassy 12ft swell, but the 21st looks like the pick of the bunch.
So, to boil it down: this Saturday, July 11th, is the best call for the short term, with a big, powerful S swell. And for the long range, keep your eye on Tuesday, July 21st, for a clean, glassy SE groundswell that could be absolutely firing.
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 14mm), heaviest on Mon afternoon. Warm (max 31°C on Tue 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 17 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | S 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3009 | 3288 | 3640 | 6993 | 6752 | 9593 | 9677 | 9510 | 8256 | 4548 | 2541 | 850 | 680 | 403 | 356 | 218 | 173 | 118 | 86 | 62 | 55 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | cross-on | on | on | on | on | cross | cross-on | cross-on | cross-off | glassy | cross-on | glassy | glassy | glassy | glassy | glassy | cross-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 | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 1 | 5 | 3 | — | 2 | — | — | 2 | — |
Temp °C | 27 | 27 | 24 | 27 | 27 | 25 | 27 | 27 | 25 | 29 | 29 | 26 | 29 | 28 | 26 | 31 | 30 | 27 | 29 | 30 | 27 |
Feels °C | 29 | 30 | 28 | 29 | 31 | 29 | 30 | 30 | 29 | 32 | 31 | 31 | 34 | 33 | 31 | 35 | 36 | 32 | 34 | 35 | 32 |
Swell 1 Height (m) Direction Period (s) | SSE 15 | SSE 15 | SSE 15 | S 17 | S 16 | S 17 | S 17 | SSW 17 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | S 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 |
| kJ | 3009 | 3288 | 3640 | 6993 | 6752 | 9593 | 9677 | 9510 | 8256 | 4548 | 2541 | 850 | 680 | 403 | 356 | 218 | 173 | 118 | 86 | 62 | 55 |
Swell 2 Height (m) Direction Period (s) | S 19 | E 8 | S 18 | — | — | — | — | — | — | SE 15 | E 9 | S 12 | SE 10 | SSW 12 | ESE 10 | SE 10 | SE 12 | ESE 9 | ESE 10 | ESE 10 | E 9 |
| kJ | 475 | 46 | 1129 | — | — | — | — | — | — | 8 | 7 | 350 | 28 | 187 | 35 | 23 | 22 | 28 | 31 | 31 | 43 |
Swell 3 Height (m) Direction Period (s) | ESE 8 | — | E 8 | — | — | — | — | — | — | — | — | SE 11 | E 9 | SE 10 | SE 10 | SE 12 | ESE 9 | SE 12 | SE 11 | SE 10 | SE 10 |
| kJ | 22 | — | 34 | — | — | — | — | — | — | — | — | 29 | 6 | 17 | 14 | 23 | 15 | 21 | 18 | 17 | 16 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 3 | — | — | — | SW 3 | — | — | SW 3 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | — | 2 | — | — | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 19 | 11 | 0 | 19 | 11 | 11 | 19 | 19 | 2 | 19 | 30 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 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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