
Surf Forecasts:
Asakawa surf forecast from 5 Sep 2026:
- Best quality surf: Monday 7 Sep, 9PM (local time) - 4.5ft (1.4m), 9s period, SE swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 9PM (local time) - 10ft (3.0m), 9s period, ESE swell with 1,361 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 9PM (local time) - 4.5ft (1.4m), 9s 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 Monday (Sep 07) at 9PM. The primary swell is predicted to be 1.4m and 9s period with a secondary swell of 0.6m 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 3.0m 9s and forecast to arrive on Sunday (Sep 06) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Monday (Sep 07) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 7th Sep) | 4.5ft (1.4m) 9s |
| Best Surf | 9PM (Mon 7th Sep) | 4.5ft (1.4m) 9s |
| Most Powerful | 9PM (Sun 6th Sep) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Right, let’s have a look at what’s on offer for Asakawa over the next couple of weeks.
Honestly, it’s a pretty flat and quiet run for Asakawa, with only a few windows of semi-interesting surf. The standout period is the first few days, from Sunday the 6th through to Wednesday the 9th, where we get some punchy swell but it’s never quite firing on all cylinders. The water temp is about average for this time of year, nothing unusual.
The first real action kicks off Sunday morning, the 6th, with a 7ft swell from the ESE at 9 seconds. Combined energy is moderate (854). The wind is cross-off from the NNE at 9 mph, so it’s rideable but the rain is heavy and the tide might be a factor. It’s messy, but there’s some push. By Sunday afternoon, the swell bumps up to 8ft from the ESE, period 10 seconds, and energy jumps to 1348 – that’s a solid moderate push. Wind swings a bit more NE at 12 mph, still cross-off, but the waves are on the bigger side, so only for the experienced crew. Crowds are possible at Asakawa.
Monday the 7th sees the swell ease: morning 6ft from the SE at 10 seconds, energy 668, wind cross-off from the NNE at 12 mph. Still okay, but undersized compared to Sunday. Afternoon drops to 5ft. By Tuesday the 8th, it’s down to 4ft in the morning, only 8-second period, energy 323 – pretty ordinary. The afternoon sees a 3ft wave from the S at 10 seconds, but it’s light rain and cross-off wind, so maybe a session for the patient.
Wednesday the 9th offers a little bump: 6ft from the SSE at 9 seconds, energy 470, and the wind turns offshore from the N at 12 mph in the afternoon. That’s the cleanest moment of the early week, but the heavy rain will keep the crowds thin. Still, if you’re keen, that’s the pick of the first week.
From Thursday the 10th onward, the swell drops off fast. Thursday morning sees 5ft but with only 8 seconds and energy 311, the wind is cross-off and the conditions are marginal. By Friday the 11th, we’re down to 4ft, glassy wind from the ENE at 3 mph, but the waves are weak and ordinary. That glassy spell is nice for the soul, but you’ll be scratching for a ride.
After that, there’s a long gap of poor surf from Saturday the 12th right through to the end of the 16-day window. From Saturday the 12th, the swell drops below 3ft, periods get short, and the wind turns onshore or cross-on. The energy numbers fall into the weak range (below 100 most days). A few glassy mornings pop up, like the 16th and 18th, but with waves only 1ft to 3ft, it’s barely a ripple. The conditions are mostly poor, with risk of thunderstorms and cross-on breezes.
For a positive note, the period from Sunday the 6th to Wednesday the 9th is the only real window, and the best bet is Wednesday afternoon with that offshore wind and 6ft swell. But don’t expect a classic.
Rusty.
Short Range ForecastHeavy rain (total 145mm), heaviest during Sun afternoon. Warm (max 29°C on Mon afternoon, min 23°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 70mm), heaviest during Wed morning. Warm (max 27°C on Fri morning, min 23°C on Wed afternoon). Wind will be generally light. | ||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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) | ESE 8 | ESE 9 | ESE 10 | ESE 10 | SE 10 | SE 9 | SE 9 | SE 8 | S 10 | S 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 |
Wave Graph | |||||||||||||||||||
155 | 838 | 1269 | 710 | 646 | 388 | 314 | 156 | 186 | 341 | 464 | 443 | 331 | 306 | 215 | 154 | 169 | 131 | 81 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | off | glassy | cross-off | off |
High Tide | 11:00PM1.46m | 3:35PM1.46m | 1:17AM1.44m | 4:19PM1.58m | 2:54AM1.54m | 4:52PM1.68m | 3:59AM1.68m | 5:21PM1.76m | 4:49AM1.79m | 5:47PM1.81m | 5:34AM1.87m | 6:13PM1.84m | |||||||
Low Tide | 7:28AM0.46m | 8:34PM1.23m | 8:55AM0.35m | 9:45PM1.08m | 9:55AM0.25m | 10:28PM0.91m | 10:41AM0.18m | 11:04PM0.73m | 11:20AM0.16m | 11:38PM0.57m | 11:55AM0.21m | 00:11AM0.43m | |||||||
— | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | |
6:23 | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | |
mm | 19 | 46 | 48 | 20 | — | — | — | 2 | 10 | 21 | 23 | 26 | — | — | — | — | — | — | — |
Temp °C | 25 | 23 | 23 | 23 | 27 | 29 | 25 | 27 | 25 | 25 | 25 | 23 | 23 | 26 | 26 | 24 | 27 | 27 | 25 |
Feels °C | 26 | 25 | 24 | 23 | 28 | 31 | 27 | 29 | 29 | 28 | 28 | 24 | 23 | 27 | 28 | 26 | 30 | 31 | 28 |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 9 | ESE 10 | ESE 10 | SE 10 | SE 9 | SE 9 | SE 8 | SE 8 | S 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 |
155 | 838 | 1269 | 710 | 646 | 388 | 314 | 156 | 149 | 341 | 464 | 443 | 331 | 306 | 215 | 154 | 169 | 131 | 81 | |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SSW 9 | SSE 10 | SSE 9 | SW 8 | SE 11 | S 10 | S 10 | S 10 | SE 8 | E 18 | E 18 | E 16 | E 16 | E 15 | NE 4 | E 15 | E 14 | SE 10 |
41 | 16 | 75 | 431 | 18 | 31 | 104 | 125 | 186 | 147 | 6 | 6 | 5 | 5 | 4 | 5 | 17 | 15 | 24 | |
Swell 3 Height (m) Direction Period (s) | — | — | S 13 | SSW 8 | SW 10 | SSW 11 | SSW 11 | ESE 10 | ESE 10 | SE 10 | — | E 18 | — | — | E 18 | E 15 | ESE 10 | ESE 10 | E 14 |
— | — | 4 | 14 | 4 | 22 | 47 | 42 | 65 | 27 | — | 6 | — | — | 6 | 17 | 11 | 19 | 36 | |
Wind waves Height (m) Direction Period (s) | NNE 3 | NNE 4 | NNE 4 | NNE 4 | NNE 5 | NNE 5 | NE 4 | NE 4 | NE 4 | NNE 4 | NNE 4 | NNE 5 | NNE 5 | NNE 5 | NE 5 | N 4 | NE 4 | NNE 4 | NNE 4 |
8 | 14 | 21 | 33 | 50 | 20 | 18 | 26 | 12 | 9 | 28 | 44 | 56 | 33 | 11 | 16 | 4 | 9 | 9 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 22 | 22 | 43 | 43 | 43 | 0 | 43 | 0 | 0 | 0 | 0 | 1 | 14 | 0 | 0 | 0 | 0 | 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.










