Surf Forecasts:
Asakawa surf forecast from 10 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 3AM (local time) - 4.5ft (1.3m), 9s period, SE swell with cross-offshore winds.
- Most powerful swell: Tuesday 15 Sep, 6AM (local time) - 4.5ft (1.3m), 9s period, SE swell with 272 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 12PM (local time) - 3.5ft (1.0m), 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 10) at 12PM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.1m and 16s. 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 1.3m 9s and forecast to arrive on Tuesday (Sep 15) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Thursday (Sep 10) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Thu 10th Sep) | 3.5ft (1.0m) 8s |
| Best Surf | 3AM (Tue 15th Sep) | 4.5ft (1.3m) 9s |
| Most Powerful | 6AM (Tue 15th Sep) | 4.5ft (1.3m) 9s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here, looking at the Asakawa forecast. It’s gonna be a slow burn for the next week. The first surf worth mentioning doesn’t show up until Friday, September 18th. Before that, it’s all small, short-period swell with glassy or cross-off winds, but the waves are tiny and weak. The water is around 82°F, which is about average for this time of year.
The real highlight is Saturday, September 20th. That morning, we’ve got a glassy session with a 15ft SSE groundswell running on a very long 16-second period. The combined energy is a massive 9161 (strong), and it’s clean all day with cross-off winds in the afternoon. That’s a serious swell, but it’s over 8ft, so it’s strictly for experts. The direction (SSE) is a bit off from the optimum SE, but with that size and period, it’ll be pumping.
Sunday, September 21st, gets even bigger, hitting 21ft from the S, but the wind turns cross-on and the break might be overwhelmed. The energy is colossal (22714), but it’s more of a spectacle than a session.
Monday, September 20th, is your best bet. After that, the swell gets too big and the wind goes bad. By Wednesday, September 23rd, a gale-force cross-on wind ruins it, and the rest of the month fades back to tiny, weak waves.
So, circle Saturday, September 20th. That’s the big one. The rest is a lot of waiting.
Rusty.
Short Range ForecastHeavy rain (total 27mm), heaviest during Thu afternoon. Warm (max 26°C on Sat afternoon, min 22°C on Thu afternoon). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 38mm), heaviest during Tue afternoon. Warm (max 28°C on Sun afternoon, min 22°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 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) | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | S 7 | S 7 | S 7 | SSE 7 | ESE 9 | SE 9 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 136 | 123 | 117 | 117 | 140 | 124 | 59 | 34 | 53 | 31 | 112 | 143 | 182 | 186 | 242 | 242 | 186 | 135 | 135 | 121 | 99 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | glassy | glassy | cross-off | cross-off | cross-off | cross | on | glassy | on | on | on | glassy | glassy | cross-off | glassy | glassy | cross-off | cross-off | glassy |
High Tide | 5:47PM1.81m | 5:34AM1.87m | 6:13PM1.84m | 6:15AM1.89m | 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 | ||||||||
Low Tide | 11:20AM0.16m | 11:38PM0.57m | 11:55AM0.21m | 00:11AM0.43m | 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 | |||||||
 |  |  | | |  |  |  |  | |  | | | |  | | | | | | | |
 | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — |
 | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:07 | — |
mm | 1 | 6 | 4 | 3 | 1 | 1 | 3 | 2 | 6 | 2 | — | 2 | 2 | 3 | 8 | 4 | 10 | 7 | 3 | 5 | 7 |
Temp °C | 24 | 22 | 24 | 25 | 25 | 24 | 25 | 26 | 26 | 27 | 28 | 25 | 27 | 26 | 22 | 23 | 23 | 23 | 24 | 23 | 24 |
Feels °C | 23 | 24 | 29 | 30 | 29 | 27 | 29 | 31 | 31 | 31 | 32 | 30 | 31 | 31 | 25 | 26 | 27 | 27 | 28 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | S 7 | S 7 | S 7 | SSE 7 | ESE 9 | SE 9 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
| kJ | 136 | 123 | 117 | 117 | 140 | 124 | 59 | 34 | 26 | 31 | 112 | 143 | 182 | 186 | 242 | 242 | 186 | 135 | 135 | 121 | 99 |
Swell 2 Height (m) Direction Period (s) | E 16 | E 15 | ESE 11 | E 15 | ESE 10 | ESE 10 | SE 10 | SE 10 | ESE 10 | SE 4 | E 13 | E 13 | E 13 | E 12 | E 12 | S 7 | E 13 | E 13 | E 14 | S 6 | E 13 |
| kJ | 5 | 4 | 12 | 17 | 20 | 19 | 24 | 25 | 35 | 7 | 31 | 13 | 13 | 12 | 12 | 1 | 14 | 13 | 4 | 1 | 3 |
Swell 3 Height (m) Direction Period (s) | S 8 | E 18 | E 15 | SE 11 | E 14 | E 14 | E 13 | E 14 | E 14 | S 7 | S 7 | S 7 | S 7 | S 7 | S 7 | E 15 | S 7 | S 7 | E 12 | E 13 | S 6 |
| kJ | 5 | 6 | 17 | 5 | 15 | 36 | 31 | 32 | 35 | 14 | 3 | 4 | 4 | 4 | 1 | 17 | 1 | 1 | 3 | 4 | 1 |
Wind waves Height (m) Direction Period (s) | NNE 5 | NE 4 | NNE 2 | — | NE 3 | NNE 3 | NE 4 | NE 3 | SSE 7 | — | SE 5 | — | — | — | — | — | NE 2 | NNE 3 | NNE 2 | — | NNE 3 |
| kJ | 50 | 7 | 1 | — | 3 | 8 | 4 | 2 | 53 | — | 25 | — | — | — | — | — | 2 | 1 | 1 | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 43 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 6 | 2 | 385 | 11 | 4 | 0 | 0 | 0 | 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.
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