
Surf Forecasts:
Asakawa surf forecast from 25 Jul 2026:
- Best quality surf: Saturday 25 Jul, 3PM (local time) - 1.5ft (0.4m), 16s period, SE swell with glassy winds.
- Most powerful swell: Saturday 25 Jul, 3PM (local time) - 1.5ft (0.4m), 16s period, SE swell with 90 kJ wave energy.
- Next surfable swell (1★+): Saturday 25 Jul, 3PM (local time) - 1.5ft (0.4m), 16s 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 (Jul 25) at 3PM. The primary swell is predicted to be 0.4m and 16s period with a secondary swell of 0.4m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 0.4m 16s and forecast to arrive on Saturday (Jul 25) at 3PM. 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 Thursday (Jul 30) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Sat 25th Jul) | 1.5ft (0.4m) 16s |
| Best Surf | 3PM (Sat 25th Jul) | 1.5ft (0.4m) 16s |
| Most Powerful | 3PM (Sat 25th Jul) | 1.5ft (0.4m) 16s |
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 on offer at Asakawa over the next couple of weeks.
Right off the bat, we've got a long stretch of very small, clean waves. The surf kicks off Saturday the 25th with tiny 1ft swell from the southeast, but it's absolutely glassy. The water is sitting at 83°, which is a touch warmer than normal for this time of year. The combined energy is weak (136), so it's really just a paddle-around session. This same small, clean, glassy pattern hangs on right through Sunday, Monday, and Tuesday morning. Conditions are almost too good for the size, with the odd afternoon sea breeze. The combined energy stays under 200 most of this time, so it's very ordinary.
From late Tuesday the 28th, the swell drops even more and the wind goes a bit onshore, making for poor conditions. This quiet, poor spell stretches right through to Sunday the 2nd of August. The combined energy on the 2nd jumps up to 201 and then 324 with a 2ft to 3ft swell from the east-southeast, but the wind is onshore or cross-onshore, so it's messy. Not a good time.
Now, here's where it gets interesting. The real standout is a solid pulse of groundswell arriving on Monday the 3rd of August. We're looking at a 5ft east-southeast swell with a very long 17-second period. The combined energy skyrockets to 1319, and the wind is light and cross-offshore. That's clean, powerful surf. The break is a point, so that long-period groundswell will wrap in nicely. This is the best on offer, but it's a week away, so keep an eye on it.
The swell builds through Tuesday the 4th and Wednesday the 5th. By Wednesday morning, we're talking a 13ft east-southeast swell with an 18-second period and a combined energy of 9792. The wind is light and cross-offshore. That's big, powerful, expert-level surf. The direction is a perfect match for the break's optimum. This is a true standout, but it's only for the experienced crew.
Thursday the 6th of August looks absolutely massive. A 16ft east-southeast swell with an 18-second period and a combined energy of 17119. The wind is glassy in the afternoon. This is as good as it gets for experts, but it's pushing the limits of what's rideable.
Friday the 7th sees the swell peak at 21ft to 23ft, but the wind is cranking offshore at 12 to 19 mph. The model says the swell is just too big for this break, so it's a no-go.
After that, the swell drops quickly. Saturday the 8th is messy with a near gale. Sunday the 9th cleans up again with a glassy 5ft swell, but the period is short at 10 seconds, so the energy is moderate (761). It's a step down from the big days.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Mon afternoon. Warm (max 33°C on Sat morning, min 27°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Tue afternoon. Warm (max 32°C on Tue afternoon, min 26°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | |||||||||||||||
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) | SE 16 | SE 16 | SE 16 | SE 15 | SE 15 | SE 14 | SE 14 | SE 14 | SE 14 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 |
Wave Graph | |||||||||||||||||||||
91 | 90 | 87 | 78 | 76 | 74 | 72 | 70 | 65 | 49 | 49 | 48 | 48 | 48 | 38 | 36 | 23 | 23 | 24 | 24 | 23 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | off | glassy | glassy | cross-off | glassy | glassy | cross-off | glassy | on | off | glassy | glassy | off | glassy | on | cross-off | cross | on | glassy |
High Tide | 4:48PM1.42m | 2:45AM1.46m | 5:23PM1.50m | 3:43AM1.52m | 5:52PM1.58m | 4:30AM1.60m | 6:20PM1.64m | 5:10AM1.68m | 6:46PM1.68m | 5:48AM1.74m | 7:11PM1.71m | 6:24AM1.77m | 7:36PM1.73m | ||||||||
Low Tide | 9:17AM0.51m | 9:41PM1.17m | 10:08AM0.41m | 10:33PM1.11m | 10:50AM0.32m | 11:10PM1.04m | 11:27AM0.23m | 11:43PM0.96m | 12:00PM0.17m | 00:13AM0.89m | 12:32PM0.15m | 00:44AM0.81m | 1:02PM0.16m | 1:15AM0.74m | |||||||
5:09 | — | — | 5:09 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | |
— | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — | — | 7:04 | — | |
mm | — | — | — | — | 2 | — | — | 4 | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 33 | 33 | 29 | 32 | 31 | 28 | 32 | 30 | 28 | 31 | 32 | 28 | 32 | 31 | 28 | 31 | 31 | 28 | 33 | 32 | 28 |
Feels °C | 37 | 38 | 33 | 35 | 36 | 32 | 36 | 35 | 33 | 35 | 37 | 32 | 36 | 36 | 33 | 34 | 35 | 32 | 37 | 36 | 33 |
Swell 1 Height (m) Direction Period (s) | SE 11 | SE 10 | SE 10 | SE 10 | SE 11 | S 8 | S 8 | S 9 | S 8 | SE 10 | SE 10 | SSW 5 | SE 10 | S 8 | SSW 8 | ESE 10 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 |
40 | 36 | 48 | 50 | 55 | 50 | 50 | 54 | 51 | 49 | 49 | 15 | 48 | 33 | 19 | 36 | 23 | 23 | 23 | 21 | 23 | |
Swell 2 Height (m) Direction Period (s) | SE 16 | SE 16 | SE 16 | SE 15 | S 9 | SE 14 | SE 10 | SE 10 | SE 10 | S 8 | S 8 | SE 10 | SSW 5 | SE 10 | ESE 10 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SE 12 | SE 11 |
91 | 90 | 87 | 78 | 39 | 74 | 51 | 50 | 50 | 36 | 35 | 48 | 10 | 48 | 38 | 11 | 6 | 10 | 5 | 24 | 20 | |
Swell 3 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | S 9 | SE 15 | SE 11 | SE 14 | SE 14 | SE 14 | SE 14 | SE 13 | SSW 8 | SSW 8 | SE 13 | SE 12 | SSW 5 | SE 12 | SE 12 | SE 12 | SSW 7 | S 7 |
5 | 5 | 10 | 26 | 76 | 40 | 72 | 70 | 65 | 29 | 28 | 22 | 22 | 26 | 25 | 2 | 6 | 6 | 24 | 5 | 4 | |
Wind waves Height (m) Direction Period (s) | NNE 3 | NNE 3 | — | NNE 3 | — | SW 3 | — | — | WSW 2 | — | SSW 4 | — | NNE 2 | — | NE 2 | NE 3 | — | — | — | SW 4 | — |
3 | 2 | — | 2 | — | 1 | — | — | 1 | — | 4 | — | 1 | — | 1 | 2 | — | — | — | 1 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 | 0 | 0 | 0 | 2 | 575 | 293 | 22 | 581 | 6 |
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.










