Surf Forecasts:
Shida surf forecast from 20 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 9AM (local time) - 10ft (3.0m), 15s period, SSE swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 3AM (local time) - 13ft (4.0m), 12s period, S swell with 4,125 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 12AM (local time) - 1.5ft (0.4m), 11s period with SE 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 Friday (Aug 21) at 12AM. The primary swell is predicted to be 0.4m and 11s period with a secondary swell of 0.5m and 8s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Shida in the next 16 days are 4.0m 12s and forecast to arrive on Thursday (Aug 27) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Saturday (Aug 22) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 21st Aug) | 1.5ft (0.4m) 11s |
| Best Surf | 9AM (Tue 25th Aug) | 10ft (3.0m) 15s |
| Most Powerful | 3AM (Thu 27th Aug) | 13ft (4.0m) 12s |
Table - best surf conditions forecast for Shida over the next 16 days.
The Lowdown
Alright mate, let’s chew through this one. The early part of the forecast is a dud—barely a ripple until next week. Don’t waste your time before Monday the 24th. From there, a proper pulse of energy shows up, but it’s not for everyone.
Shida is an inconsistent spot, so a flat start is pretty normal. Water temp is about 80°F, right around average for the time of year.
From Thursday afternoon the 20th through Sunday the 23rd, the swell is tiny and weak: 1ft to 3ft, combined energy low (77–288). Winds are light offshore or cross-off, keeping it clean but there’s no grunt. A few thunderstorms and rain showers around too. Not worth wetting a wetsuit.
Monday morning the 24th of August is the big standout. Glassy flat calm, 7ft SSE groundswell with a very long 18-second period. Combined energy hits 3024—strong stuff. This is for experienced surfers only. The offshore wind and long period will give clean, lined-up waves.
Monday afternoon and Tuesday the 25th keep the quality high, but Tuesday morning’s swell surges to 10ft. That’s too big for Shida, even with clean offshore wind. Energy is massive at 4087. Stick to Monday.
Wednesday the 26th morning offers another excellent session: 7ft S swell, 13-second period, light offshore wind, clean. Still big, but manageable for the experienced crew.
Thursday the 27th of August is a beast: 12ft SSE swell, fresh offshore wind at 22 mph, energy 3432. Expert-only. The paddle-out will test you.
From Friday the 28th through Monday the 31st, winds turn onshore or cross-onshore. Swell stays big (4ft to 10ft) but it’s choppy and messy. Honestly, this stretch looks more fun for a kite surfer than a paddle surfer.
Into early September, Wednesday morning the 2nd brings a cleanup: 7ft ESE swell, 12-second period, light cross-off wind, clean, energy 1421. Another good window for experienced surfers.
Thursday and Friday the 3rd–4th see the swell spike again to 10ft, but shorter period and cross-shore wind make it rough.
Your best bets are Monday the 24th of August morning—glassy, 7ft SSE groundswell, long period—and Wednesday the 26th of August morning—clean, 7ft S swell, light offshore. Bring your skills and your courage.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Sat night. Warm (max 28°C on Fri morning, min 23°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 10mm), heaviest on Wed morning. Warm (max 29°C on Tue morning, min 24°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 11 | SE 11 | S 9 | SSW 8 | E 9 | E 11 | E 11 | E 10 | E 10 | SSE 15 | SSE 14 | SSE 18 | SSE 16 | SSE 15 | SSE 15 | S 15 | S 14 | S 13 | S 12 | S 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 40 | 40 | 40 | 94 | 41 | 151 | 233 | 198 | 113 | 148 | 774 | 2864 | 2968 | 3283 | 3874 | 3665 | 2651 | 1568 | 1122 | 3191 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | cross-off | cross-off | cross-off | on | cross-on | cross | cross-on | glassy | off | cross-off | cross-off | off | cross-off | off | off | off |
High Tide | 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 | 4:25PM1.36m | 2:57AM1.40m | |||||||||
Low Tide | 4:02AM0.48m | 5:32AM0.48m | 6:59AM0.43m | 7:26PM1.15m | 8:00AM0.35m | 8:31PM1.08m | 8:45AM0.27m | 9:07PM0.99m | 9:22AM0.21m | 9:38PM0.89m | ||||||||||
 |  | |  | |  | |  |  | |  | | | | | |  | |  |  | |
 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — |
 | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — |
mm | — | — | — | — | — | 1 | 1 | 4 | 2 | — | — | 1 | 1 | — | — | — | 3 | 5 | 11 | 33 |
Temp °C | 27 | 26 | 28 | 27 | 26 | 28 | 28 | 26 | 26 | 26 | 25 | 27 | 27 | 26 | 29 | 28 | 27 | 24 | 24 | 26 |
Feels °C | 29 | 28 | 29 | 27 | 28 | 29 | 30 | 30 | 28 | 28 | 29 | 29 | 28 | 28 | 30 | 29 | 29 | 27 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | E 8 | E 9 | E 11 | E 11 | E 10 | E 10 | E 9 | SSE 14 | SSE 18 | SSE 16 | SSE 15 | SSE 15 | S 15 | S 14 | S 13 | S 12 | E 15 |
| kJ | 21 | 32 | 34 | 35 | 41 | 151 | 233 | 198 | 113 | 81 | 774 | 2864 | 2968 | 3283 | 3874 | 3665 | 2651 | 1568 | 1122 | 110 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 11 | S 9 | SE 10 | S 9 | SSW 9 | SSW 9 | S 5 | SSE 5 | SSE 15 | E 9 | ESE 12 | ESE 12 | E 14 | ESE 14 | ESE 13 | ESE 13 | E 12 | E 12 | ESE 12 |
| kJ | 40 | 40 | 39 | 39 | 38 | 28 | 27 | 11 | 7 | 148 | 80 | 142 | 199 | 206 | 195 | 184 | 176 | 112 | 104 | 46 |
Swell 3 Height (m) Direction Period (s) | SSW 9 | SSW 8 | SE 11 | ESE 5 | SE 10 | SE 10 | SE 10 | SSW 9 | SSW 9 | ESE 12 | ESE 12 | SW 8 | S 22 | E 15 | SW 11 | SW 10 | E 19 | ESE 18 | E 16 | SE 16 |
| kJ | 16 | 13 | 40 | 2 | 36 | 25 | 28 | 26 | 15 | 56 | 49 | 18 | 236 | 68 | 18 | 16 | 30 | 61 | 81 | 10 |
Wind waves Height (m) Direction Period (s) | SE 5 | SE 5 | SSW 3 | SSW 8 | S 4 | S 5 | S 5 | — | NE 3 | — | SSW 4 | — | S 8 | SW 10 | SSE 5 | — | — | — | — | S 11 |
| kJ | 10 | 6 | 2 | 94 | 17 | 29 | 24 | — | 1 | — | 11 | — | 37 | 46 | 17 | — | — | — | — | 3191 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 153 | 1 | 7 | 3 | 17 | 63 | 17 | 0 | 0 | 0 | 1 | 565 | 91 | 0 | 0 | 640 |
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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