Surf Forecasts:
Shida surf forecast from 17 Aug 2026:
- Best quality surf: Friday 21 Aug, 6PM (local time) - 2.5ft (0.7m), 11s period, SSW swell with offshore winds.
- Most powerful swell: Monday 24 Aug, 9AM (local time) - 7ft (2.2m), 7s period, SSW swell with 459 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 12AM (local time) - 3ft (0.9m), 8s period with ESE 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 0.9m and 8s 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 Shida in the next 16 days are 2.2m 7s and forecast to arrive on Monday (Aug 24) at 9AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Monday (Aug 24) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 18th Aug) | 3ft (0.9m) 8s |
| Best Surf | 6PM (Fri 21st Aug) | 2.5ft (0.7m) 11s |
| Most Powerful | 9AM (Mon 24th Aug) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Shida over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s size up Shida for the next couple of weeks. This spot’s exposed, suited for intermediate surfers, but it’s inconsistent—don’t count on waves every day. It needs swell from the southeast to really fire, and we’ve got a mixed bag coming.
First standout is Saturday, August 22nd. Morning brings 3ft of ESE swell with a moderate south offshore wind, making for clean, lined-up waves. The combined energy is 239 (moderate). Afternoon gets even better: 3ft from the east, 11-second period, still a moderate south offshore. Energy climbs to 307 (moderate). That’s your pick of the first week—longer period like that means better shape, but at a beach break, those sets might close out a bit. Water temp’s about 80°, pretty normal for August.
Next up, Tuesday, August 25th. Morning has 4ft of SSE swell at a nice 14-second period, with gentle cross-offshore winds. Energy is 661 (strong). This is quality, long-period groundswell—great for a point or reef, but if you’re on a beach, watch for the sets running straight. Afternoon sees 5ft, period hitting 16 seconds, and energy jumping to 1106 (strong). Conditions stay clean. This is the best quality for experienced surfers, but remember: Shida’s inconsistent, so expect spaced-out sets rather than a constant flow.
Now, things get heavy. Wednesday, August 26th morning: 8ft of SSE groundswell, 16-second period, but a cross-shore wind from the east creates a little chop. Energy is massive at 3229 (very strong). This is expert-only—way too big for beginners. Wednesday afternoon: 8ft, same long period, energy 3867, with a bit more cross-chop. Raw and powerful.
From Thursday, August 27th, it’s all downhill for paddlers. Swell hits 10ft with strong onshore cross-winds—messy, lumpy, and dangerous. The wind picks up big-time, and by Friday the 28th, we’re seeing 13ft with near-gale offshore winds. That kind of setup is more for kite surfers than paddle surfers. The only reprieve comes Sunday, August 30th afternoon: 7ft from the SE, moderate south-southwest offshore wind, energy 2301 (strong). That’s clean and manageable for experienced surfers, but still a solid wave.
The run from August 27th through to September 1st is mostly blown out or too big. The odd session on the 30th is your only real look if you’re game.
So, for the best overall: Saturday the 22nd for a fun, clean day, or Tuesday the 25th for more power and longer-period waves. The later stuff is for the brave (or the crazy). Stay safe out there.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Mon afternoon, min 24°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Sun morning. Warm (max 28°C on Fri afternoon, min 24°C on Sun morning). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 | ESE 8 | ESE 8 | E 8 | E 8 | SE 10 | E 9 | SE 10 | SE 10 | SE 11 | ESE 8 | S 9 | S 9 | SSW 11 | ESE 9 | E 11 | E 10 | E 10 | E 9 | ESE 12 |
Wave Graph | ||||||||||||||||||||
151 | 115 | 90 | 61 | 47 | 35 | 36 | 35 | 39 | 40 | 65 | 60 | 43 | 119 | 156 | 233 | 208 | 186 | 110 | 85 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | off | off | off | off | off | off | off | cross-off | off | cross-off |
High Tide | 6:50PM1.46m | 7:30AM1.22m | 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 | |||||||||
Low Tide | 1:22AM0.44m | 12:59PM0.68m | 2:06AM0.43m | 1:18PM0.81m | 2:56AM0.45m | 1:27PM0.93m | 4:02AM0.48m | 5:32AM0.48m | 6:59AM0.43m | 7:26PM1.15m | ||||||||||
— | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | |
6:25 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 7 | 2 | 17 |
Temp °C | 27 | 25 | 27 | 26 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 28 | 26 | 27 | 27 | 26 | 24 | 25 | 25 |
Feels °C | 29 | 27 | 29 | 27 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 30 | 29 | 28 | 28 | 27 | 26 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | E 9 | ESE 8 | ESE 8 | E 8 | E 8 | SE 6 | SE 6 | ESE 6 | SE 6 | E 8 | ESE 8 | S 9 | S 9 | SSW 11 | ESE 9 | E 11 | E 10 | E 10 | E 9 | E 9 |
151 | 115 | 90 | 61 | 47 | 23 | 28 | 22 | 15 | 32 | 65 | 60 | 43 | 119 | 156 | 233 | 208 | 186 | 110 | 56 | |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 10 | SE 10 | SE 7 | SE 6 | E 8 | E 9 | ENE 9 | E 8 | SE 11 | S 10 | E 8 | E 8 | E 10 | SSW 10 | S 10 | S 10 | SSW 9 | SSW 9 | ESE 12 |
30 | 39 | 37 | 21 | 24 | 35 | 36 | 25 | 34 | 40 | 49 | 33 | 34 | 88 | 78 | 70 | 46 | 28 | 28 | 85 | |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 9 | SE 11 | SE 11 | SE 10 | SE 10 | S 4 | SE 10 | SSE 10 | SSE 10 | ESE 12 | SSE 10 |
23 | 13 | 6 | 37 | 36 | 35 | 35 | 35 | 39 | 16 | 40 | 41 | 37 | 37 | 5 | 4 | 10 | 19 | 30 | 10 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | ESE 6 | SE 6 | SE 6 | S 3 | S 4 | S 4 | S 4 | S 4 | S 5 | S 4 | SSW 6 |
— | — | — | — | — | — | — | — | — | 13 | 43 | 15 | 5 | 9 | 7 | 8 | 5 | 11 | 16 | 148 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 17 | 0 | 0 | 216 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 35 | 0 | 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.











