
Surf Forecasts:
Asakawa surf forecast from 11 Sep 2026:
- Best quality surf: Saturday 19 Sep, 9AM (local time) - 5.5ft (1.7m), 18s period, SE swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 9AM (local time) - 5.5ft (1.7m), 18s period, SE swell with 1,860 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 9AM (local time) - 2.5ft (0.7m), 7s period with S 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 (Sep 12) at 9AM. The primary swell is predicted to be 0.7m and 7s period with a secondary swell of 0.4m and 10s. 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 1.7m 18s and forecast to arrive on Saturday (Sep 19) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Thursday (Sep 17) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sat 12th Sep) | 2.5ft (0.7m) 7s |
| Best Surf | 9AM (Sat 19th Sep) | 5.5ft (1.7m) 18s |
| Most Powerful | 9AM (Sat 19th Sep) | 5.5ft (1.7m) 18s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what Asakawa has cooking for us. This is a point break that's inconsistent and only really wakes up when the swell direction hits from the southeast. The water temperature is sitting at 82°, which is about average for this time of year, nothing too wild.
Right now, we’ve got a bit of a flat spell to start. The first surf that’s even worth mentioning is Saturday morning, the 12th, with some small 2ft south swell and a period of 7 seconds, so pretty weak short-period stuff. The wind is light and cross-off, keeping it clean, but the combined energy is only 102, which is weak. It's surfable, but honestly, very ordinary. Not worth getting too excited about, and it’s inconsistent, so you could be waiting a while.
Sunday the 13th and Monday the 14th are pretty similar – knee-high dribble with clean conditions at times, but the energy is low and the quality is poor. Tuesday the 15th and Wednesday the 16th offer the same story: small, weak swell and poor surf.
The first real standout doesn’t arrive until Friday morning, the 18th. Suddenly, the swell jumps to 7ft from the east with an 8-second period. The combined energy hits 965 (moderate), and it's glassy with no wind. That’s a damn good looking window for those who can handle a bit of size – it’s getting into expert territory. This is the first proper highlight. The break is expecting very good surf conditions for the morning.
Then, hold onto your board. Saturday the 19th morning is the absolute peak of this run. Swell is 6ft from the southeast but get this – the period is 18 seconds. That's a very long period groundswell, pumping in a massive 3171 combined energy. The wind is light cross-off and clean. This is excellent surf for experienced surfers. However, a long period swell like that can break a bit straight on a beach break, but at Asakawa’s point, it should set up nicely. The afternoon gets bigger to 10ft and 16 seconds, energy goes through the roof at 5688, but the wind turns cross and the report says marginal, so the morning is your window.
Sunday the 20th keeps the party going with a solid 12ft SE swell, 14-second period, and clean cross-off winds both morning and afternoon. The energy is massive at 4736 and 4395. This is excellent for experts, but well over the 8ft mark, so beginners stay on the beach.
Monday the 21st is still pumping with 8ft swell and clean cross-off winds. Energy is still high (2375). This run is the best on offer.
After that, things get ugly. Tuesday the 22nd sees the swell blow up to 18ft and 34ft with strong onshore winds. That’s a complete washout and dangerous. Wednesday the 23rd has a clean-up with offshore wind and 5ft swell, but the energy drops off fast. From the 24th onward, we’re back to flat, small, and poor conditions all the way to the 27th.
So, to wrap it up: there’s a big gap of flat, ordinary surf from now until the 17th. The standout is Saturday morning, the 19th – that 6ft SE groundswell with an 18-second period and clean cross-off wind is the best you’ll see. Friday the 18th morning and Sunday the 20th are also top-tier. After that, it’s over. Crowds are possible at Asakawa when it’s good, so get in early.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Mon afternoon. Warm (max 28°C on Sun morning, min 24°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 39mm), heaviest during Thu morning. Warm (max 27°C on Tue morning, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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) | S 7 | S 7 | E 14 | SE 9 | ESE 9 | SE 9 | SE 8 | SE 8 | ESE 10 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 | ESE 9 | SE 9 | ESE 7 | E 8 | ESE 9 | ESE 8 |
Wave Graph | |||||||||||||||||||||
47 | 34 | 35 | 40 | 54 | 145 | 135 | 118 | 161 | 166 | 141 | 135 | 101 | 99 | 79 | 96 | 77 | 177 | 666 | 343 | 428 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | glassy | glassy | on | glassy | glassy | cross-on | glassy | on | on | glassy | glassy | glassy | glassy | cross-off | cross | cross | glassy | cross-on | cross |
High Tide | 6:37PM1.84m | 6:54AM1.85m | 7:00PM1.83m | 7:31AM1.78m | 7:22PM1.79m | 8:09AM1.67m | 7:43PM1.73m | 8:48AM1.54m | 8:04PM1.66m | 9:32AM1.40m | 8:24PM1.57m | 10:38AM1.28m | 8:45PM1.47m | ||||||||
Low Tide | 12:27PM0.30m | 00:43AM0.33m | 12:57PM0.43m | 1:15AM0.29m | 1:24PM0.57m | 1:46AM0.29m | 1:50PM0.72m | 2:19AM0.34m | 2:13PM0.87m | 2:54AM0.42m | 2:34PM1.00m | 3:36AM0.53m | 2:53PM1.12m | ||||||||
5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — | — | |
— | 6:14 | — | — | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | |
mm | 1 | 1 | 4 | — | — | 2 | 3 | 4 | 2 | 1 | 2 | 1 | 3 | 6 | 7 | 5 | 7 | 7 | — | 1 | — |
Temp °C | 27 | 27 | 25 | 28 | 28 | 26 | 27 | 27 | 25 | 27 | 26 | 24 | 25 | 25 | 24 | 26 | 26 | 24 | 27 | 27 | 24 |
Feels °C | 30 | 32 | 30 | 32 | 31 | 31 | 32 | 30 | 29 | 29 | 29 | 28 | 29 | 30 | 29 | 29 | 29 | 28 | 29 | 30 | 26 |
Swell 1 Height (m) Direction Period (s) | S 7 | S 7 | S 7 | SE 9 | ESE 9 | SE 9 | SE 8 | SE 8 | ESE 10 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 | ESE 9 | SE 9 | E 12 | ESE 8 | ESE 9 | SE 19 |
47 | 34 | 15 | 40 | 54 | 145 | 135 | 118 | 161 | 166 | 141 | 135 | 101 | 99 | 79 | 96 | 77 | 3 | 299 | 343 | 57 | |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | ESE 10 | SE 4 | S 7 | E 13 | E 13 | E 12 | E 12 | E 12 | E 13 | E 13 | E 12 | S 7 | E 13 | E 12 | E 12 | — | — | E 17 | ESE 15 |
24 | 25 | 35 | 5 | 8 | 29 | 13 | 25 | 12 | 11 | 13 | 12 | 3 | 1 | 3 | 3 | 3 | — | — | 6 | 21 | |
Swell 3 Height (m) Direction Period (s) | E 13 | E 14 | E 14 | S 7 | E 13 | S 6 | S 7 | S 7 | S 7 | S 7 | S 6 | S 7 | E 14 | E 13 | S 7 | S 7 | S 7 | — | — | S 10 | S 10 |
31 | 32 | 35 | 8 | 31 | 3 | 3 | 3 | 1 | 1 | 1 | 1 | 4 | 4 | 1 | 1 | 1 | — | — | 2 | 2 | |
Wind waves Height (m) Direction Period (s) | NE 3 | — | ESE 4 | E 4 | SE 3 | — | — | — | — | — | — | — | — | — | NE 3 | NNE 3 | NE 3 | ESE 7 | E 8 | — | ESE 8 |
3 | — | 7 | 2 | 3 | — | — | — | — | — | — | — | — | — | 1 | 4 | 6 | 177 | 666 | — | 428 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 22 | 0 | 1 | 11 | 0 | 0 | 11 | 0 | 11 | 11 | 0 | 0 | 0 | 0 | 0 | 22 | 1 | 0 | 19 | 43 |
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.










