
Surf Forecasts:
Shida surf forecast from 12 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 12AM (local time) - 4.5ft (1.4m), 9s period, E swell with glassy winds.
- Most powerful swell: Sunday 16 Aug, 12PM (local time) - 6ft (1.9m), 10s period, E swell with 687 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 12AM (local time) - 4.5ft (1.4m), 9s period with E swell.
Best Forecast Surf Conditions for Shida this week:
The surf forecast for Shida over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 12AM. The primary swell is predicted to be 1.4m and 9s period with a secondary swell of 0.4m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Shida in the next 16 days are 1.9m 10s and forecast to arrive on Sunday (Aug 16) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Wednesday (Aug 19) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 18th Aug) | 4.5ft (1.4m) 9s |
| Best Surf | 12AM (Tue 18th Aug) | 4.5ft (1.4m) 9s |
| Most Powerful | 12PM (Sun 16th Aug) | 6ft (1.9m) 10s |
Table - best surf conditions forecast for Shida over the next 16 days.
The Lowdown
Alright folks, Rusty here.
Let’s be straight up. The next 16 days for this spot are a bit of a slow grind. The first week is a total washout with messy, cross-onshore winds and poor quality. The good stuff, if you can call it that, doesn’t start to show up until after the first week. Water temp is about 81°F, which is pretty normal for this time of year, so no issues there.
The first week, from Wednesday the 12th through Monday the 17th, is a write-off. The wind is cross-on or cross, and the swell is from the east, but the conditions are choppy and ugly. You’ll see some moderate energy readings in the 295 to 736 range, but it’s not worth a paddle.
We finally get a clean window on Tuesday the 18th. The morning at Shida has a light cross-offshore breeze from the SSW. The swell is a modest 4ft from the east, with a 9-second period, and the energy is moderate (283). It’s not big, but it’s clean. The afternoon stays clean, too. This is your first real chance to get wet.
The standout window, the one you should mark on your calendar, is Friday the 21st. The morning brings a new swell from the SSW, around 4ft, with a 7-second period, and a light cross-offshore breeze. The energy is moderate (266). But the afternoon is the real deal. The swell jumps to 6ft from the SSW, period hits 8 seconds, and the wind stays light cross-offshore. The energy pushes to 430. It’s clean, it’s building, and this is the best the whole outlook has to offer. The break is inconsistent, so don’t expect non-stop waves, but when they come, they’ll be worth it.
The weekend of the 22nd and 23rd gets a bit messy again, but by Sunday the 23rd afternoon, we get a light offshore from the south, with a 3ft swell from the ENE. It’s small, but clean. And Monday the 24th looks decent too, with a moderate offshore wind from the south all day, and a clean 3ft to 2ft swell. The energy is low (218 to 99), but the conditions are good.
The last few days from the 25th on drop right off, with very small swell and strong cross-offshore winds. Nothing to see there.
So, keep your eyes on Friday the 21st for the best of the bunch. It’s a long way out, but it’s the most promising. The rest is a waiting game. If you’re really keen, the Tuesday morning the 18th and Monday the 24th are your best bets for a clean session.
Rusty.
Short Range ForecastHeavy rain (total 33mm), heaviest during Wed morning. Warm (max 27°C on Thu morning, min 24°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sat morning. Warm (max 27°C on Sat morning, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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) | E 9 | E 9 | E 9 | E 9 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 |
Wave Graph | |||||||||||||||||||||
210 | 201 | 318 | 383 | 426 | 440 | 443 | 434 | 505 | 430 | 459 | 479 | 673 | 683 | 573 | 480 | 408 | 340 | 235 | 189 | 119 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | on | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | cross-off | cross-off | cross-off |
High Tide | 5:03PM1.43m | 3:31AM1.51m | 5:26PM1.45m | 4:22AM1.52m | 5:48PM1.46m | 5:10AM1.49m | 6:09PM1.47m | 5:56AM1.42m | 6:30PM1.47m | 6:42AM1.33m | 6:50PM1.46m | 7:30AM1.22m | 7:11PM1.44m | ||||||||
Low Tide | 9:55AM0.01m | 10:09PM0.91m | 10:34AM0.04m | 10:48PM0.78m | 11:09AM0.11m | 11:26PM0.65m | 11:41AM0.23m | 00:04AM0.55m | 12:10PM0.38m | 00:42AM0.48m | 12:36PM0.53m | 1:22AM0.44m | 12:59PM0.68m | 2:06AM0.43m | |||||||
4:54 | — | — | 4:54 | — | — | 4:56 | — | — | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | |
— | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:23 | — | |
mm | 9 | 6 | 1 | 1 | 1 | 3 | — | 1 | 11 | 1 | — | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 24 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 24 | 26 | 26 | 24 | 25 | 25 | 23 | 26 | 27 | 25 |
Feels °C | 26 | 26 | 27 | 29 | 29 | 28 | 28 | 29 | 27 | 27 | 27 | 24 | 25 | 24 | 24 | 24 | 24 | 24 | 27 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 9 | E 10 | E 10 | E 10 | E 10 | S 10 | E 9 | S 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 |
210 | 201 | 318 | 383 | 426 | 440 | 443 | 434 | 71 | 430 | 72 | 479 | 673 | 683 | 573 | 480 | 408 | 340 | 235 | 189 | 119 | |
Swell 2 Height (m) Direction Period (s) | S 6 | S 5 | S 10 | S 10 | S 10 | SSW 9 | SSW 9 | SSE 11 | S 13 | SSE 9 | SSE 13 | S 9 | S 9 | S 9 | S 9 | S 8 | S 8 | S 8 | S 8 | SE 10 | SSE 9 |
32 | 20 | 51 | 50 | 48 | 29 | 28 | 24 | 51 | 47 | 16 | 41 | 41 | 42 | 39 | 35 | 22 | 21 | 21 | 38 | 58 | |
Swell 3 Height (m) Direction Period (s) | S 10 | S 10 | S 5 | — | SE 12 | S 12 | SE 11 | S 9 | S 9 | S 11 | SE 8 | SE 12 | SE 12 | SE 17 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | SSE 8 | SSE 7 |
53 | 53 | 8 | — | 6 | 11 | 30 | 14 | 2 | 63 | 3 | 6 | 6 | 11 | 19 | 20 | 31 | 28 | 27 | 11 | 9 | |
Wind waves Height (m) Direction Period (s) | ESE 6 | E 5 | — | — | — | — | NNE 4 | — | E 9 | — | E 9 | ENE 10 | ENE 10 | — | — | — | — | — | — | S 8 | SSW 3 |
137 | 67 | — | — | — | — | 8 | — | 505 | — | 459 | 378 | 551 | — | — | — | — | — | — | 34 | 7 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 74 | 74 | 3 | 17 | 63 | 17 | 63 | 115 | 63 | 74 | 115 | 17 | 63 | 63 | 23 | 63 | 63 | 0 | 0 | 256 | 155 |
Best forecast wave conditions in Chiba | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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Information about the Shida Surf forecast
The above surf forecast table for Shida provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Shida can be found by selecting the local surf guide option on the grey menu. Our Shida 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 (Shida) 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 Shida 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.
Shida is 9 km (6 miles) from the city of Ohara. If you plan a holiday in Chiba, look for hotels and other accommodation in Ohara. Ohara has rooms for a wide range of budgets as well as car hire and transport links.











