Surf Forecasts:
Asakawa surf forecast from 2 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 3AM (local time) - 11ft (3.5m), 10s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 10s period, SSE swell with 3,251 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 9AM (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 9AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.4m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 4.0m 10s and forecast to arrive on Wednesday (Sep 09) 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 1.2m 5s period and expected on Monday (Sep 07) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Thu 3rd Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 3AM (Wed 9th Sep) | 11ft (3.5m) 10s |
| Most Powerful | 9AM (Wed 9th Sep) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s break down what’s heading to Asakawa. This is a point break with an inconsistent reputation – no guarantee it’ll be pumping. The water’s a touch warmer than normal (84°F), about 3°F above the average for the time of year, so it’s noticeably warm.
We’ve got a slow start. The first real surf comes Thursday morning, September 3 – small and glassy. A light 3 mph west wind, 1.1m (4ft) SSE swell with an 8-second period. Combined energy is moderate (206). It’s surfable, just. Thursday afternoon picks up a bit: 1.2m (4ft) SSE swell, 10-second period, glassy again, energy moderate (342). That’s the best of a quiet opening.
Friday morning, September 4, brings 1.5m (5ft) S swell at 10 seconds, energy moderate (473), but a 12 mph cross-off wind from the NNE blows it up. Not great. Afternoon is similar – 1.4m (5ft) S swell, energy moderate (408), same wind hassle.
Saturday, September 5, is flat and messy. Sunday morning, September 6, serves up 1.8m (6ft) ESE swell at 8 seconds, energy moderate (530), but the wind isn’t right. The afternoon jumps to 4.0m (13ft) E swell at 10 seconds – strong energy (3893) – but it’s cross-shore and rainy. That’s expert territory only.
Tuesday morning, September 8, is your first real standout: 1.9m (6ft) SE swell at 10 seconds, strong energy (768), and clean cross-off winds. Good surf. Tuesday afternoon gets bigger: 2.3m (8ft) SE swell, energy very strong (1055). This is the pick of the first week.
Wednesday, September 9, is for the brave: 4.0m (13ft) SSE swell in the morning, energy very strong (3257), excellent for experienced surfers. Afternoon: 3.5m (12ft) S swell, energy very strong (4198), still clean. Experts only.
The rest of the week fades into small, windy junk. Then Monday morning, September 14, glows: 2.2m (7ft) E swell at 9 seconds, strong energy (1066), glassy conditions. That’s a beauty. After that, it trickles away to nothing.
Best bets: Tuesday morning, September 8, for clean, building swell, and Monday morning, September 14, for glassy 2.2m E swell. Wednesday, September 9, is for experts only – big and clean.
Asakawa needs that SE direction to shine, and it gets it on those days.
Rusty.
Short Range ForecastHeavy rain (total 93mm), heaviest during Fri afternoon. Warm (max 29°C on Thu afternoon, min 21°C on Fri afternoon). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 95mm), heaviest during Tue afternoon. Warm (max 25°C on Tue morning, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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 10 | S 10 | S 10 | S 10 | S 9 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 10 | ESE 10 | ESE 8 | ESE 9 | SE 9 | SE 10 | SE 10 | SSE 10 | SSE 10 | S 10 | SE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 157 | 294 | 450 | 434 | 377 | 152 | 72 | 87 | 163 | 482 | 2881 | 1023 | 346 | 245 | 437 | 681 | 1055 | 2018 | 3251 | 2420 | 528 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on |
High Tide | 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 | 3:59AM1.68m | 5:21PM1.76m | ||||||||
Low Tide | 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 | 10:41AM0.18m | 11:04PM0.73m | ||||||||
 | |  |  | |  |  | |  |  | | |  | | | | | | |  | | |
 | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — |
 | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — |
mm | 3 | 3 | 1 | 23 | 49 | 13 | — | — | 1 | 2 | 4 | 14 | 8 | 8 | 5 | 2 | 25 | 27 | 5 | — | 16 |
Temp °C | 27 | 29 | 26 | 24 | 22 | 22 | 27 | 27 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 25 | 24 | 25 | 27 | 27 | 27 |
Feels °C | 32 | 34 | 30 | 25 | 23 | 22 | 27 | 26 | 24 | 26 | 27 | 27 | 25 | 25 | 25 | 27 | 27 | 29 | 31 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 10 | S 10 | S 10 | S 10 | S 9 | ESE 8 | ESE 8 | ESE 8 | SSW 9 | ESE 10 | ESE 10 | ESE 8 | ESE 9 | SE 9 | SE 10 | SE 10 | SSE 10 | E 18 | SSE 10 | SE 9 |
| kJ | 157 | 294 | 450 | 434 | 377 | 152 | 72 | 87 | 163 | 48 | 980 | 1023 | 346 | 245 | 437 | 681 | 1055 | 1602 | 6 | 1772 | 528 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 10 | SE 10 | SE 9 | ESE 9 | E 7 | S 8 | S 8 | S 8 | — | SSW 9 | SSW 9 | SSW 10 | SSW 9 | S 11 | S 10 | — | — | — | E 18 | E 16 |
| kJ | 33 | 33 | 15 | 23 | 17 | 67 | 63 | 60 | 48 | — | 32 | 27 | 52 | 33 | 59 | 75 | — | — | — | 6 | 5 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | ESE 10 | E 9 | SE 9 | SE 9 | SW 9 | E 13 | SSW 11 | — | — | — | — | S 8 | SSW 9 | SSW 11 | — | — | — | — | E 16 |
| kJ | 16 | 15 | 18 | 16 | 14 | 12 | 21 | 3 | 12 | — | — | — | — | 5 | 8 | 12 | — | — | — | — | 21 |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 4 | NE 4 | N 3 | NNE 4 | NE 4 | NE 3 | ESE 8 | E 10 | NNE 4 | NNE 4 | NNE 5 | NNE 4 | NNE 4 | NE 3 | SSE 10 | SSE 10 | S 10 | NNE 3 |
| kJ | — | — | — | 19 | 31 | 5 | 13 | 20 | 3 | 482 | 2881 | 11 | 39 | 64 | 18 | 10 | 5 | 2018 | 3251 | 2420 | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 43 | 43 | 0 | 43 | 43 | 22 | 22 | 19 | 0 | 43 | 43 | 0 | 0 | 0 | 43 | 0 | 0 | 57 |
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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