Surf Forecasts:
Asakawa surf forecast from 1 Aug 2026:
- Best quality surf: Tuesday 4 Aug, 9PM (local time) - 15ft (4.5m), 17s period, ESE swell with glassy winds.
- Most powerful swell: Thursday 6 Aug, 9AM (local time) - 21ft (6.5m), 18s period, SE swell with 25,845 kJ wave energy.
- Next surfable swell (1★+): Saturday 1 Aug, 9PM (local time) - 1.5ft (0.4m), 11s 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 (Aug 01) at 9PM. The primary swell is predicted to be 0.2m and 18s period with a secondary swell of 0.4m and 11s. Another secondary swell of 0.4m and 5s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 6.5m 18s and forecast to arrive on Thursday (Aug 06) at 9AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Sunday (Aug 02) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 1st Aug) | 1.5ft (0.4m) 11s |
| Best Surf | 9PM (Tue 4th Aug) | 15ft (4.5m) 17s |
| Most Powerful | 9AM (Thu 6th Aug) | 21ft (6.5m) 18s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let’s talk waves for Asakawa. The next 16 days are a bit of a mixed bag, starting slow and then firing off a big one before settling back down.
Right now, the water’s at about 84°F, which is a touch warmer than normal for this time of year. Not a big deal, but you’ll notice it.
The first couple of days are pretty dead. Saturday morning is glassy with no wind, but the swell is tiny, just over a foot, and weak. Sunday shows a little bump but it’s still small and weak. Not worth the paddle.
Monday and Tuesday start to see some size. Swell builds from around 1.5m on Monday to 3.0m on Tuesday, and the energy is picking up as well. But the wind is onshore or cross-onshore, so it’s going to be messy and choppy. Not the cleanest.
The standout is Wednesday the 5th. Swell jumps to 4.5m, energy is strong, and the wind is light and cross-shore. This is your best bet for clean, powerful surf. Thursday the 6th is even bigger, with 6.5m, but that’s too much for this break. It’s going to be a beast, and unless you’re an expert, you’ll want to sit this one out. The wind is also up, making it tougher.
Friday the 7th is still big, 6.0m, but the wind picks up to 25-30 km/h, making it bumpy and messy. Saturday the 8th backs off a little to 4.5m but the wind is still up and there’s storm risk. From Sunday the 9th, the swell fades and the wind turns onshore, and we’re looking at a downward slide into the second week. The surf gets weak and sloppy, with a small, clean-ish window on the morning of the 14th with a cross-off breeze, but it’s just tiny and ordinary.
So, mark your calendar for Wednesday morning. That’s the one to get. The rest of the week is either too big or too sloppy, and the second week basically flatlines. Forecasts can change, but right now, that’s the call.
Rusty out.
Short Range ForecastLight rain (total 8mm), mostly falling on Mon morning. Warm (max 34°C on Sun morning, min 26°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 31°C on Thu morning, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | |||||||||||||||
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 10 | SE 11 | SE 16 | ESE 18 | ESE 16 | ESE 15 | ESE 16 | ESE 16 | ESE 17 | ESE 17 | ESE 18 | ESE 17 | SE 17 | SE 17 | SE 18 | SE 18 | SE 17 | SSE 16 | SSE 16 | SSE 16 | S 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 28 | 29 | 64 | 174 | 568 | 621 | 1081 | 1327 | 3967 | 4431 | 6227 | 9536 | 12298 | 14763 | 21197 | 25845 | 21485 | 17982 | 16645 | 13658 | 12870 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross-on | on | glassy | cross | cross-on | cross-off | cross | cross-on | cross-off | cross | cross | cross |
High Tide | 8:00PM1.74m | 7:37AM1.73m | 8:25PM1.74m | 8:17AM1.67m | 8:51PM1.72m | 9:03AM1.58m | 9:19PM1.69m | 9:59AM1.47m | 9:52PM1.64m | 11:18AM1.36m | 10:35PM1.58m | 1:18PM1.32m | 11:38PM1.53m | ||||||||
Low Tide | 1:31PM0.21m | 1:47AM0.67m | 2:00PM0.31m | 2:22AM0.61m | 2:31PM0.44m | 3:01AM0.57m | 3:03PM0.60m | 3:47AM0.54m | 3:40PM0.78m | 4:44AM0.52m | 4:27PM0.97m | 6:00AM0.50m | 5:43PM1.14m | ||||||||
 | |  | | |  |  | |  |  | | | | | | | | | | | | |
 | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — | 5:16 | — | — | 5:18 | — | — |
 | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — |
mm | — | — | — | — | — | — | 2 | 3 | 3 | — | — | — | — | — | — | — | — | — | 1 | 3 | 13 |
Temp °C | 33 | 32 | 29 | 34 | 34 | 30 | 29 | 29 | 27 | 27 | 28 | 26 | 30 | 30 | 27 | 31 | 31 | 27 | 30 | 29 | 27 |
Feels °C | 36 | 35 | 33 | 37 | 37 | 35 | 33 | 33 | 31 | 30 | 31 | 30 | 32 | 33 | 31 | 32 | 32 | 29 | 31 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 11 | SE 16 | ESE 18 | ESE 16 | ESE 15 | ESE 16 | ESE 16 | ESE 17 | ESE 17 | ESE 18 | ESE 17 | SE 17 | SE 17 | SE 18 | SE 18 | SE 17 | SSE 16 | SSE 16 | SSE 16 | S 16 |
| kJ | 28 | 29 | 64 | 174 | 568 | 621 | 1081 | 1327 | 3967 | 4431 | 6227 | 9536 | 12298 | 14763 | 21197 | 25845 | 21485 | 17982 | 16645 | 13658 | 12870 |
Swell 2 Height (m) Direction Period (s) | SSW 4 | ESE 17 | SE 11 | ESE 14 | S 7 | SE 10 | ESE 6 | S 8 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 4 | 28 | 18 | 120 | 4 | 15 | 29 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 7 | S 4 | ESE 19 | SE 9 | SSW 8 | SSW 8 | SSE 10 | S 8 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1 | 1 | 35 | 41 | 7 | 6 | 9 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | NE 3 | NE 4 | — | E 6 | ESE 7 | E 8 | E 8 | E 9 | — | — | — | — | — | — | — | E 9 | — | — |
| kJ | — | — | — | 6 | 7 | — | 96 | 186 | 451 | 551 | 885 | — | — | — | — | — | — | — | 1444 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 435 | 433 | 0 | 0 | 0 | 0 | 41 | 369 | 19 | 19 | 459 | 0 | 43 | 19 | 19 | 444 | 444 | 444 | 510 | 459 | 459 |
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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