Surf Forecasts:
Shida surf forecast from 18 Aug 2026:
- Best quality surf: Saturday 22 Aug, 6AM (local time) - 2.5ft (0.8m), 11s period, E swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 9AM (local time) - 8ft (2.5m), 17s period, S swell with 4,173 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 9AM (local time) - 1.5ft (0.5m), 8s 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 Wednesday (Aug 19) at 9AM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.6m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Shida in the next 16 days are 2.5m 17s and forecast to arrive on Wednesday (Aug 26) 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 0.8m 4s period and expected on Saturday (Aug 22) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 19th Aug) | 1.5ft (0.5m) 8s |
| Best Surf | 6AM (Sat 22nd Aug) | 2.5ft (0.8m) 11s |
| Most Powerful | 9AM (Wed 26th Aug) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Shida over the next 16 days.
The Lowdown
Alright, surfers, let’s break down what’s coming for Shida over the next couple of weeks.
Right off the bat, it’s dead flat. Nothing happening for the first few days. The first real glimmer of life is Saturday morning, August 22nd, with a small 0.8m easterly, but the energy is still weak (204). The real action starts to build on Monday, August 24th.
The standout window is Wednesday, August 26th, through Thursday, August 27th. The swell goes huge, with sets from the south at 8 to 10 feet, and a very long period around 16 to 17 seconds. The combined energy is massive (4,397 and 4,341). That’s for experts only, folks. Over 8 feet, it’s serious. The wind is offshore or cross-off, keeping it clean, but you’ll need to be experienced. The long period means it’s a proper groundswell, which can be a little tricky at a beach break like Shida.
The afternoon of Monday, August 24th, is a nice little session: 2 feet from the SSE, 14-second period, with a gentle offshore wind. Clean and fun.
Later on, from the 29th, the swell drops but stays rideable, with some 5 to 7-foot waves. The wind gets a bit messy, with some cross-onshore and a few storms around. The best call later is the morning of Sunday, August 30th: glassy conditions, 5 feet from the south, with moderate energy (505). That’s clean and a good option for most.
Expect crowds at Shida to be often, especially when the swell shows up. The water temp is about 79°, which is normal for this time of year.
The very end of the window, the first days of September, shows another huge pulse, with 10 to 16-foot swell and extreme energy, but that’s over a week out, and the winds are forecast to be strong to fresh. It’s promising, but don’t lock it in yet.
So, for the seasoned crew, the 26th and 27th are the real targets. For everyone else, the 30th morning is your best bet for a clean, manageable wave.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Fri morning, min 25°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Warm (max 29°C on Sat morning, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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) | SE 10 | E 9 | E 9 | SE 10 | SE 11 | SE 11 | S 9 | SE 10 | E 9 | E 11 | E 10 | E 10 | E 10 | E 9 | E 9 | E 12 | SSE 14 | SSE 17 | SSE 15 | SSE 14 | SSE 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 35 | 36 | 37 | 39 | 40 | 40 | 40 | 39 | 58 | 151 | 221 | 198 | 120 | 80 | 78 | 69 | 186 | 427 | 1432 | 1598 | 2688 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | on | cross-on | cross-on | on | glassy | off | cross-off | cross-off | cross-off | cross-off |
High Tide | 7:33PM1.41m | 9:44AM1.02m | 7:57PM1.37m | 8:28PM1.31m | 9:26PM1.25m | 3:57PM1.20m | 11:30PM1.23m | 3:57PM1.26m | 1:06AM1.26m | 4:09PM1.31m | 2:09AM1.33m | ||||||||||
Low Tide | 1:18PM0.81m | 2:56AM0.45m | 1:27PM0.93m | 4:02AM0.48m | 5:32AM0.48m | 6:59AM0.43m | 7:26PM1.15m | 8:00AM0.35m | 8:31PM1.08m | 8:45AM0.27m | 9:07PM0.99m | ||||||||||
 | |  | |  |  | | | | | |  | | | | | | | | | | |
 | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — |
 | — | 6:22 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 26 | 27 | 27 | 26 | 28 | 28 | 26 | 29 | 29 | 26 | 26 | 26 | 25 | 27 | 28 | 26 | 29 | 29 | 26 |
Feels °C | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 30 | 30 | 30 | 29 | 28 | 28 | 32 | 30 | 28 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SE 6 | SE 6 | SE 6 | SE 6 | E 8 | E 8 | E 8 | E 8 | E 9 | E 11 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | SSE 14 | SSE 13 | SSE 15 | SSE 14 | SSE 15 |
| kJ | 23 | 21 | 20 | 15 | 33 | 32 | 34 | 35 | 58 | 151 | 221 | 198 | 120 | 80 | 78 | 55 | 186 | 427 | 1432 | 1598 | 2688 |
Swell 2 Height (m) Direction Period (s) | E 8 | E 9 | E 9 | E 8 | SE 11 | SE 11 | S 9 | S 8 | S 9 | SSW 9 | SSW 9 | S 5 | S 5 | SE 11 | E 12 | SE 11 | E 8 | SSE 17 | ESE 14 | ESE 13 | E 13 |
| kJ | 35 | 36 | 37 | 21 | 40 | 40 | 39 | 36 | 39 | 28 | 27 | 12 | 7 | 30 | 73 | 55 | 50 | 404 | 254 | 232 | 166 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SSW 9 | SSW 8 | SE 11 | SE 10 | SE 10 | SE 10 | SSE 11 | SSW 9 | SSW 9 | ESE 12 | SSE 10 | E 12 | SSE 12 | E 11 | SW 11 | SSW 10 | SSW 10 |
| kJ | 35 | 35 | 35 | 39 | 16 | 13 | 40 | 39 | 36 | 25 | 12 | 28 | 15 | 48 | 39 | 69 | 91 | 114 | 29 | 11 | 11 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SE 5 | SSE 5 | SSE 5 | S 3 | S 5 | S 5 | SSW 4 | — | NE 4 | ENE 4 | — | — | — | — | — | SW 11 | — |
| kJ | — | — | — | — | 10 | 5 | 4 | 3 | 16 | 24 | 24 | — | 16 | 15 | — | — | — | — | — | 115 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 3 | 3 | 17 | 3 | 0 | 0 | 91 | 91 | 565 | 91 |
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.
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