Surf Forecasts:
Osaki Point surf forecast from 20 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 6PM (local time) - 18ft (5.5m), 16s period, SE swell with onshore winds.
- Most powerful swell: Tuesday 25 Aug, 9PM (local time) - 20ft (6.0m), 15s period, SE swell with 16,414 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 6PM (local time) - 2.5ft (0.8m), 9s period with S swell.
Best Forecast Surf Conditions for Osaki Point this week:
The surf forecast for Osaki Point over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 6PM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.4m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Osaki Point in the next 16 days are 6.0m 15s and forecast to arrive on Tuesday (Aug 25) at 9PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 7s period and expected on Wednesday (Aug 26) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Thu 20th Aug) | 2.5ft (0.8m) 9s |
| Best Surf | 6PM (Tue 25th Aug) | 18ft (5.5m) 16s |
| Most Powerful | 9PM (Tue 25th Aug) | 20ft (6.0m) 15s |
Table - best surf conditions forecast for Osaki Point over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s talk about what’s coming up for Osaki Point. This is a beach and reef set-up that’s consistent, but the first few days are pretty ordinary. The water temp is sitting at 83°, which is about average for this time of year – nothing to write home about.
We kick off Thursday morning, 20 August, with tiny 1ft waves from the ESE at 10 seconds. The wind’s glassy, so it’s clean, but the energy is weak (75). It’s surfable, but you’ll be doing a lot of paddling for little reward. The afternoon stays small with a light cross-off breeze.
Friday morning, 21 August, we see a bump up to 3ft from the S, 9-second period. Glassy conditions again, and the energy jumps to moderate (207). This is the best of the early window – clean, fun little waves for an intermediate. The afternoon brings a risk of thunderstorms, but the wind stays cross-off.
Saturday, 22 August, drops back to 3ft from the SSW, still clean in the morning, but nothing special. Sunday, 23 August, is similar with 2ft to 3ft. The energy is moderate (178–198), but the waves are just ordinary.
Now, here’s where it gets interesting. Monday morning, 24 August, the swell jumps to 7ft from the SE with a very long 17-second period. That’s a proper groundswell, and the energy is strong (2802). This is a standout for the confident surfer only – 7ft is pushing beyond beginner territory. The wind is light cross-onshore, so it’s a bit bumpy, but the power is real. The afternoon holds similar, with energy at 4245. Keep in mind, with that long period, Osaki Point being a beach and reef break might see the waves breaking a bit straight – it’s best suited for a point or reef, but worth a look.
Tuesday, 25 August, is a mixed bag. The morning sees 16ft from the SE, 16 seconds, with a massive energy of 12708 – that’s strong. But the wind is onshore from the NE at 12 mph, making it messy. This is expert-only territory, and honestly, the conditions look more interesting for kite surfing than paddle surfing. The afternoon is a write-off with onshore winds and thunderstorms.
Wednesday, 26 August, is a beast. 18ft to 23ft from the SE and ESE, with energies up to 21050. The wind is strong cross-onshore, 22–25 mph. The swell is too big for this break – even for experts, it’s a no-go. Kite surfers might have a field day, but for us paddle surfers, sit this one out.
Thursday, 27 August, the swell drops to 7ft from the SE, 10 seconds, with energy at 996. The wind is cross-off from the S at 28 mph, which cleans it up, but that’s a strong breeze. It’s marginal at best. Friday, 28 August, we’re down to 5ft, still from the SE, with moderate energy (445). The wind is cross-off, but the quality is just OK.
Saturday, 29 August, brings a redeeming moment. The morning has 3ft from the S, 10 seconds, with offshore wind from the WSW at 9 mph. That’s clean and glassy. Energy is moderate (207). This is a nice little window for beginners and intermediates – small, clean, and fun.
Sunday, 30 August, we get another glassy morning, 3ft from the SE, 9 seconds, energy at 251. The wind is light, the waves are clean. Not a standout, but a solid session if you’re keen.
Then we hit a dry spell. From Monday, 31 August, through to Wednesday, 2 September, the swell stays around 3ft to 7ft, but the wind is onshore or cross-onshore, and the conditions are poor. The energy is moderate (229–556), but the quality is lacking. Friday, 4 September, sees 8ft from the E, 10 seconds, but with strong cross-onshore wind at 19 mph – messy and lumpy.
Overall, the standout is Monday, 24 August, with that long-period groundswell and strong energy. For a safer bet, Saturday, 29 August, offers clean, small waves in offshore wind. The rest of the window is mostly ordinary or poor.
Rusty.
Short Range ForecastSome drizzle, heaviest during Fri afternoon. Warm (max 29°C on Thu morning, min 25°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 53mm), heaviest during Tue night. Warm (max 29°C on Sun morning, min 25°C on Sun night). Winds increasing (calm on Sun night, strong winds from the ENE by Tue night). | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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) | ESE 10 | ESE 10 | S 9 | S 9 | S 9 | S 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 10 | SE 16 | SE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SE 14 | SE 12 | ESE 12 | SE 11 |
Wave Graph | |||||||||||||||||||||
38 | 39 | 126 | 168 | 180 | 165 | 135 | 129 | 72 | 75 | 145 | 532 | 2630 | 2354 | 5607 | 12612 | 12454 | 16247 | 8846 | 13944 | 1538 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | off | glassy | cross-off | off | glassy | cross-off | glassy | glassy | cross-off | glassy | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on |
High Tide | 11:19AM1.24m | 9:52PM1.48m | 2:11PM1.21m | 10:36PM1.40m | 4:23PM1.32m | 00:37AM1.34m | 4:44PM1.42m | 2:32AM1.39m | 5:05PM1.52m | 3:36AM1.49m | 5:26PM1.60m | 4:21AM1.60m | 5:47PM1.67m | ||||||||
Low Tide | 3:42PM1.07m | 5:43AM0.65m | 4:02PM1.20m | 7:29AM0.66m | 8:20PM1.27m | 8:58AM0.58m | 9:52PM1.18m | 9:53AM0.46m | 10:27PM1.07m | 10:32AM0.35m | 10:56PM0.96m | 11:06AM0.26m | 11:23PM0.84m | ||||||||
5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | |
— | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | 2 | 51 | 21 | 56 | 144 |
Temp °C | 29 | 29 | 26 | 28 | 28 | 27 | 29 | 29 | 27 | 29 | 29 | 26 | 28 | 29 | 26 | 29 | 28 | 26 | 26 | 27 | 27 |
Feels °C | 33 | 33 | 31 | 32 | 32 | 32 | 33 | 32 | 32 | 33 | 32 | 30 | 32 | 32 | 29 | 30 | 29 | 25 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | E 7 | S 8 | S 9 | S 9 | S 9 | S 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 10 | SE 16 | SE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SE 14 | SSW 11 | SSE 13 | SE 11 |
25 | 32 | 126 | 168 | 180 | 165 | 135 | 129 | 72 | 75 | 145 | 532 | 2630 | 2354 | 5607 | 12612 | 12454 | 16247 | 12 | 7106 | 1538 | |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 7 | ESE 10 | SE 11 | ESE 11 | SE 11 | E 10 | E 10 | E 10 | E 10 | E 10 | SSW 10 | SSW 9 | SE 18 | SSW 10 | SSW 10 | SSW 10 | — | SW 11 | — | E 17 |
38 | 16 | 41 | 30 | 45 | 29 | 28 | 31 | 31 | 49 | 30 | 151 | 98 | 1747 | 92 | 71 | 39 | — | 5 | — | 22 | |
Swell 3 Height (m) Direction Period (s) | SSW 8 | ESE 10 | ESE 7 | ESE 7 | ESE 6 | E 9 | SE 11 | ESE 10 | ESE 13 | SW 10 | ESE 11 | E 9 | E 12 | SSW 10 | E 12 | E 12 | — | — | E 20 | — | — |
12 | 39 | 16 | 9 | 8 | 14 | 33 | 10 | 35 | 54 | 23 | 27 | 74 | 144 | 44 | 25 | — | — | 7 | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ESE 6 | — | — | E 14 | SE 12 | ESE 12 | WSW 7 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 85 | — | — | 93 | 8846 | 13944 | 646 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 42 | 49 | 20 | 22 | 49 | 457 | 497 | 607 | 277 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Osaki Point Surf forecast
The above surf forecast table for Osaki Point provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Osaki Point can be found by selecting the local surf guide option on the grey menu. Our Osaki Point 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 (Osaki Point) 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 Osaki Point 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.
Osaki Point is 14 km (9 miles) from Muroto. If you plan a holiday in Shikoku, look for hotels and other accommodation in Muroto. Muroto has rooms for a wide range of budgets as well as car hire and transport links.











