Surf Forecasts:
Asakawa surf forecast from 2 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 12AM (local time) - 16ft (5.0m), 12s period, SE swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 12AM (local time) - 16ft (5.0m), 12s period, SE swell with 7,713 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 12AM (local time) - 3.5ft (1.1m), 8s period with SSE 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 Thursday (Sep 03) at 12AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.4m and 11s. Another secondary swell of 0.7m and 4s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 5.0m 12s and forecast to arrive on Wednesday (Sep 09) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Friday (Sep 04) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 3rd Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 12AM (Wed 9th Sep) | 16ft (5.0m) 12s |
| Most Powerful | 12AM (Wed 9th Sep) | 16ft (5.0m) 12s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, listen up. This is a tough one. Asakawa is a point break, and it's inconsistent, so we're not going to see much action right away. The water is running a touch warmer than normal for this time of year, coming in at 84.4°F.
The first few days are a write-off. Wednesday and Thursday are a complete mess of storms and poor conditions.
Thursday afternoon, the 3rd of September, things start to look a little better. We've got a clean 3.9ft S/SE swell at 10 seconds, and with a light NNE cross-offshore breeze, it's going to be tidy. The wave energy is moderate (342). It's not a standout, but it's the first time you can paddle out without feeling like you're in a washing machine.
Friday morning, the 4th, gets a bit more interesting. The swell bumps up to 6.2ft from the SSE, period is still 10 seconds, and the wind is still a clean NNE cross-off. The energy is starting to kick (645). It's a solid, fun size for a point like this, and the conditions will be clean, so it's a window.
The real standout, though, is Wednesday, the 9th of September. The morning session is the pick of the whole 16-day run. The swell is a solid 11.5ft from the SE, period is a long 13 seconds, and the wind is variable, going glassy. That's a groundswell with serious energy (4209). The conditions are excellent, but I'd warn you, over 8ft, this is for experts only. That long period is going to grind beautifully down this point.
The afternoon of the 9th is still good, with 9.8ft from the SE at 12 seconds and a clean cross-off, but it's not quite as perfect as the morning.
After that, it drops off. There's a small window on the 13th and 14th of September with glassy conditions and clean 4.3ft to 5.6ft ESE swell, perfect for a beginner or a longboard. The energy is moderate (around 400-476).
The second week has one more big spike on the 16th of September, with an 11.5ft SE swell, but it's a bit of a messy one with onshore winds, so it's less certain. The 17th of September has a cleaner 7.5ft SE swell with a strong offshore wind, but it's still not as clean as the 9th.
So, for the best on offer, you have to wait. The absolute standout is Wednesday morning, the 9th of September. Get your big wave board, because that's a heavy, serious session. The Friday morning before that, the 4th, is your next best bet for a cleaner, slightly smaller day.
Short Range ForecastHeavy rain (total 167mm), heaviest during Fri morning. Warm (max 30°C on Wed afternoon, min 21°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 310mm), heaviest during Mon night. Warm (max 28°C on Tue morning, min 23°C on Sat night). Mainly fresh winds. | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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) | SSE 9 | SSE 8 | SSE 8 | SSE 10 | S 10 | SSE 10 | S 10 | S 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | SE 8 | SE 9 | SE 11 | SE 11 | SE 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 206 | 164 | 157 | 294 | 408 | 631 | 464 | 194 | 301 | 695 | 878 | 790 | 908 | 662 | 865 | 571 | 542 | 2866 | 3716 | 7713 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross | cross | cross-on | on | cross-off |
High Tide | 8:30PM1.72m | 9:51AM1.47m | 9:02PM1.65m | 11:18AM1.35m | 9:43PM1.56m | 1:51PM1.33m | 11:00PM1.46m | 3:35PM1.46m | 1:17AM1.44m | 4:19PM1.58m | 2:54AM1.54m | 4:52PM1.68m | ||||||||
Low Tide | 3:16AM0.36m | 3:06PM0.93m | 4:13AM0.42m | 3:51PM1.11m | 5:37AM0.48m | 5:35PM1.26m | 7:28AM0.46m | 8:34PM1.23m | 8:55AM0.35m | 9:45PM1.08m | 9:55AM0.25m | 10:28PM0.91m | ||||||||
 |  | |  |  |  | |  |  | |  | | | |  | | | | | | |
 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — |
 | 6:28 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — |
mm | 1 | 3 | 5 | 1 | 32 | 67 | 29 | 29 | — | — | 8 | 21 | 20 | 53 | 8 | 17 | 172 | 11 | 3 | 4 |
Temp °C | 30 | 27 | 26 | 26 | 24 | 23 | 23 | 22 | 27 | 27 | 24 | 23 | 23 | 26 | 26 | 26 | 27 | 28 | 29 | 27 |
Feels °C | 33 | 32 | 32 | 29 | 26 | 25 | 24 | 24 | 26 | 27 | 26 | 24 | 24 | 27 | 27 | 27 | 27 | 34 | 34 | 33 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | SSE 8 | SSE 8 | SSE 10 | S 10 | SSE 10 | S 10 | S 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | S 9 | ESE 9 | SSW 8 | SE 8 | SE 9 | — | — | SE 12 |
| kJ | 206 | 164 | 157 | 294 | 408 | 631 | 464 | 194 | 301 | 695 | 878 | 790 | 56 | 662 | 14 | 571 | 542 | — | — | 6858 |
Swell 2 Height (m) Direction Period (s) | E 11 | ESE 11 | ESE 10 | ESE 10 | SE 10 | E 9 | ESE 7 | ESE 8 | SSW 10 | SSW 10 | S 9 | S 8 | — | SSW 9 | — | E 9 | SSW 8 | — | — | — |
| kJ | 58 | 37 | 33 | 33 | 15 | 7 | 64 | 154 | 292 | 375 | 154 | 57 | — | 25 | — | 74 | 28 | — | — | — |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 10 | SE 10 | ESE 10 | E 9 | — | SW 11 | E 16 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 18 | 18 | 16 | 15 | 18 | 7 | — | 61 | 5 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | E 4 | E 4 | NNE 2 | NE 4 | NNE 4 | NE 5 | NE 4 | NNE 4 | NNE 4 | — | — | ESE 9 | — | ESE 8 | — | E 6 | SE 11 | SE 11 | SE 12 |
| kJ | — | 16 | 8 | 1 | 26 | 39 | 61 | 4 | 31 | 28 | — | — | 908 | — | 865 | — | 171 | 2866 | 3716 | 7713 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 19 | 0 | 0 | 0 | 0 | 0 | 43 | 0 | 43 | 57 | 0 | 22 | 22 | 43 | 285 | 385 | 43 | 43 | 11 | 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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