Surf Forecasts:
Shida surf forecast from 18 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 6PM (local time) - 5ft (1.6m), 13s period, SSE swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 6PM (local time) - 5ft (1.6m), 13s period, SSE swell with 775 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 9PM (local time) - 2ft (0.6m), 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 Tuesday (Aug 18) at 9PM. The primary swell is predicted to be 0.6m 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 1.6m 13s and forecast to arrive on Tuesday (Aug 25) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Saturday (Aug 22) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 18th Aug) | 2ft (0.6m) 8s |
| Best Surf | 6PM (Tue 25th Aug) | 5ft (1.6m) 13s |
| Most Powerful | 6PM (Tue 25th Aug) | 5ft (1.6m) 13s |
Table - best surf conditions forecast for Shida over the next 16 days.
The Lowdown
Alright folks, Rusty here. Looks like we’ve got a bit of a slow burn for the next week or so at Shida. The surf is tiny and the energy is weak for the first few days, so don’t expect much. But there’s a solid pulse of proper swell building for the end of the forecast period that could make it all worthwhile.
The first real hope kicks off on Saturday the 22nd of August. We’ve got a small but clean 3ft swell from the East with a moderate 11-second period and a combined energy of 224 (moderate). The best part? The wind is light offshore or cross-off all day, keeping things tidy. This is a nice little warm-up, but the real meat is still a ways out.
Tuesday the 25th of August is when things start to get interesting. By the afternoon, the swell jumps to 5ft out of the SSE with a 13-second period, pushing energy up to 976. That’s a solid groundswell, and with light cross-off winds, the waves should be clean and have some real push. This is a standout session for the more confident intermediate surfers, as the size is starting to get a bit much for beginners.
The real heavyweight arrives on Saturday the 29th of August. Swell is 5ft from the South with a 14-second period, and the energy is strong at 1067. Saturday afternoon sees a proper offshore wind from the SSW, making for clean, powerful lines. This is the pick of the whole forecast: a good size, long period groundswell, and glassy conditions. It’s not for the faint-hearted though, as the size is pushing into expert territory.
Sunday the 30th of August keeps the quality high. Still a solid 3 to 3ft from the SSW, with a long 14-second period and light offshore winds. Energy is still high at 771. Clean, consistent, and a worthy follow-up to the Saturday session.
Monday the 31st of August offers a final hurrah with 5ft from the SE and a 10-second period, again with offshore winds. Energy is still strong at 676. It’s a little shorter period, but still a very good option.
Heads up: by Tuesday the 1st of September, the swell is predicted to be too big for this break—10ft from the East—and blowing a gale. That’s only for the hardcore chargers, if anyone. The following days look massive and messy, best left alone.
So, to sum it up: the first week is a wait, but the last few days of August are the real deal. Saturday the 29th and Sunday the 30th are the absolute standouts. Get on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Fri morning, min 25°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 19mm), heaviest on Sat afternoon. Warm (max 28°C on Fri afternoon, min 24°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 8 | E 8 | E 8 | E 9 | E 9 | SE 10 | SE 11 | SE 11 | ESE 8 | SE 10 | E 9 | E 11 | E 10 | E 10 | E 10 | E 10 | E 9 | E 12 | E 12 | ESE 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 61 | 47 | 50 | 36 | 37 | 39 | 40 | 40 | 53 | 39 | 57 | 149 | 204 | 158 | 154 | 117 | 79 | 70 | 71 | 68 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross-off | off | cross-off | off | off | off | off | cross-off | cross-off | off | cross-off | cross-on | glassy | cross-off | off | off | off |
High Tide | 7:11PM1.44m | 8:25AM1.11m | 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 | |||||||||
Low Tide | 2:06AM0.43m | 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 | ||||||||||
 |  |  | |  | | | | | |  |  | |  | | | | | | | |
 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — |
 | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 4 | 6 | 2 | 2 | 1 | — | — | — |
Temp °C | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 26 | 27 | 26 | 27 | 28 | 26 |
Feels °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 30 | 30 | 30 | 30 | 32 | 30 | 29 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | E 8 | SE 6 | SE 6 | E 9 | SE 6 | SE 6 | SE 5 | E 8 | ESE 8 | E 8 | SSE 5 | E 11 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | ESE 11 |
| kJ | 61 | 31 | 23 | 36 | 25 | 25 | 14 | 32 | 53 | 35 | 13 | 149 | 204 | 158 | 154 | 117 | 79 | 57 | 55 | 68 |
Swell 2 Height (m) Direction Period (s) | SE 10 | E 8 | E 8 | SE 10 | E 9 | E 8 | E 8 | SE 11 | S 9 | S 8 | E 9 | S 5 | S 5 | S 5 | SSW 9 | SSW 9 | E 12 | E 12 | E 12 | E 8 |
| kJ | 37 | 47 | 50 | 35 | 37 | 33 | 33 | 40 | 39 | 36 | 57 | 27 | 26 | 12 | 28 | 27 | 72 | 70 | 71 | 34 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SE 10 | SE 10 | SSW 8 | SE 10 | SE 10 | SE 11 | SE 5 | SE 11 | SE 10 | SE 10 | S 10 | SSW 9 | SSW 9 | SE 11 | SE 11 | SSW 9 | SE 10 | SSE 9 | SSE 11 |
| kJ | 6 | 36 | 35 | 6 | 35 | 39 | 40 | 10 | 40 | 39 | 50 | 48 | 28 | 29 | 29 | 29 | 26 | 24 | 34 | 45 |
Wind waves Height (m) Direction Period (s) | SE 7 | — | — | SE 6 | — | — | — | SSE 5 | — | S 3 | — | S 5 | SSW 5 | NE 3 | ENE 4 | ENE 4 | — | — | — | — |
| kJ | 21 | — | — | 21 | — | — | — | 11 | — | 2 | — | 43 | 36 | 3 | 5 | 2 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17 | 0 | 0 | 0 | 0 | 0 |
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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