Surf Forecasts:
Asakawa surf forecast from 9 Aug 2026:
- Best quality surf: Monday 10 Aug, 6AM (local time) - 3.5ft (1.1m), 11s period, S swell with offshore winds.
- Most powerful swell: Monday 10 Aug, 6AM (local time) - 3.5ft (1.1m), 11s period, S swell with 267 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 6AM (local time) - 3.5ft (1.1m), 11s 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 Monday (Aug 10) at 6AM. The primary swell is predicted to be 1.1m and 11s period with a secondary swell of 0.8m and 13s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.1m 11s and forecast to arrive on Monday (Aug 10) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Tuesday (Aug 11) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 10th Aug) | 3.5ft (1.1m) 11s |
| Best Surf | 6AM (Mon 10th Aug) | 3.5ft (1.1m) 11s |
| Most Powerful | 6AM (Mon 10th Aug) | 3.5ft (1.1m) 11s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get into it.
We've got a bit of a mixed bag coming up for Asakawa. The first few days offer the cleanest conditions, but the swell is on the smaller side. After that, things get a bit ordinary, with a run of days that are more about a paddle than a proper wave. The water temp is sitting around 84°F which is pretty standard for this time of year.
The standout for the whole period is hands down Monday the 10th and Tuesday the 11th. It’s not big, but it’s clean. Monday morning, we’re looking at a clean 4ft of swell from the south, with a 10-second period. The wind is a light NNE cross-off, keeping the surface tidy. Combined swell energy is solid (513). That morning session is the pick of the forecast. Tuesday stays similar, clean 3ft south swell with the same cross-off breeze, just a touch more wind, but still good. The energy is still moderate (307).
Wednesday the 12th starts off with glassy conditions and 2ft of south swell (191 energy), but it's very ordinary. By the afternoon, the wind swings onshore and things get choppy.
From Thursday the 13th right through to the start of the following week, it’s a slog. We get a long stretch of small, weak swell, often with onshore or cross-onshore winds. Most days are either poor or just surfable but very ordinary. The energy drops right down, often below 100. This is a dry spell for quality waves.
There's a little flicker on Thursday the 20th with a glassy afternoon and 3ft of south swell (152 energy), but the pattern is still messy.
The last real glimmer of hope is Saturday the 22nd and Sunday the 23rd. Saturday morning sees a glassy 3ft from the SSW (172 energy), and Saturday afternoon is dead calm and glassy with 3ft. Sunday also holds glassy conditions with 2ft. The swell is small, but if you get on it early, it’ll be clean and uncrowded.
In the end, the best advice is to make the most of the 10th and 11th. After that, it's a waiting game for the next pulse of proper swell.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Wed afternoon. Warm (max 31°C on Tue afternoon, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 20mm), heaviest during Thu morning. Warm (max 29°C on Fri morning, min 23°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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 10 | S 10 | S 10 | S 10 | S 10 | SSW 10 | S 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 10 | S 10 | SSW 9 | SSW 9 | S 9 | S 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 242 | 190 | 260 | 216 | 212 | 173 | 96 | 88 | 131 | 90 | 86 | 86 | 78 | 56 | 54 | 92 | 117 | 113 | 88 | 57 | 51 |
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 | off | glassy | cross-on | glassy | cross | cross-on | glassy | glassy | cross-on | cross-off | glassy | on | glassy | on | cross-on | cross-off |
High Tide | 5:14PM1.67m | 3:52AM1.69m | 5:51PM1.75m | 4:49AM1.80m | 6:24PM1.81m | 5:39AM1.88m | 6:54PM1.83m | 6:24AM1.90m | 7:22PM1.83m | 7:07AM1.87m | 7:49PM1.81m | 7:49AM1.78m | 8:14PM1.77m | ||||||||
Low Tide | 10:02AM0.17m | 10:33PM1.05m | 10:55AM0.05m | 11:18PM0.92m | 11:39AM-0.00m | 11:58PM0.78m | 12:20PM0.01m | 00:35AM0.66m | 12:56PM0.09m | 1:12AM0.56m | 1:30PM0.22m | 1:48AM0.49m | 2:00PM0.39m | 2:24AM0.47m | |||||||
 |  |  | | |  | |  |  |  | |  | | | | | | | | | | |
 | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — |
 | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:47 | — |
mm | — | — | — | — | — | — | — | 2 | 2 | 5 | 5 | 3 | — | 3 | — | — | 1 | 3 | 1 | 3 | 2 |
Temp °C | 30 | 30 | 26 | 30 | 31 | 24 | 27 | 25 | 24 | 25 | 26 | 25 | 29 | 28 | 25 | 29 | 29 | 26 | 28 | 28 | 25 |
Feels °C | 33 | 33 | 29 | 29 | 30 | 25 | 30 | 27 | 27 | 28 | 30 | 30 | 31 | 31 | 28 | 31 | 31 | 31 | 30 | 31 | 28 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 10 | S 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 10 | S 10 | SSW 9 | SSW 9 | S 9 | S 8 |
| kJ | 242 | 190 | 260 | 216 | 212 | 173 | 96 | 88 | 131 | 90 | 86 | 86 | 78 | 56 | 54 | 92 | 117 | 113 | 88 | 57 | 51 |
Swell 2 Height (m) Direction Period (s) | E 12 | E 12 | E 12 | E 11 | E 11 | E 10 | SSW 11 | SSW 10 | ESE 6 | ESE 9 | E 9 | ESE 4 | ESE 9 | E 9 | E 10 | SE 10 | E 10 | E 9 | E 8 | ESE 9 | SE 11 |
| kJ | 193 | 144 | 101 | 63 | 59 | 35 | 76 | 68 | 10 | 17 | 15 | 5 | 16 | 14 | 17 | 28 | 18 | 60 | 37 | 28 | 42 |
Swell 3 Height (m) Direction Period (s) | SSW 11 | SW 11 | SE 14 | SE 13 | SE 13 | NE 4 | E 10 | E 10 | SE 12 | SE 12 | SE 12 | E 10 | SE 11 | SE 11 | SE 11 | E 10 | SE 10 | SE 12 | SE 12 | SE 12 | E 9 |
| kJ | 78 | 56 | 31 | 28 | 7 | 4 | 19 | 8 | 24 | 23 | 22 | 17 | 20 | 19 | 19 | 17 | 17 | 23 | 35 | 34 | 14 |
Wind waves Height (m) Direction Period (s) | N 3 | NE 4 | NE 3 | NE 4 | NE 5 | N 4 | NE 3 | E 4 | — | — | E 4 | — | — | — | — | — | — | — | — | SW 3 | SW 3 |
| kJ | 4 | 2 | 5 | 16 | 51 | 10 | 2 | 7 | — | — | 5 | — | — | — | — | — | — | — | — | 2 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 473 | 0 | 43 | 369 | 0 | 0 | 11 | 0 | 0 | 11 | 0 | 4 | 2 | 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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