Surf Forecasts:
Shida surf forecast from 17 Aug 2026:
- Best quality surf: Monday 24 Aug, 9PM (local time) - 10ft (3.0m), 17s period, SSE swell with offshore winds.
- Most powerful swell: Monday 24 Aug, 9PM (local time) - 10ft (3.0m), 17s period, SSE swell with 4,447 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 9AM (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 9AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.6m and 6s is also forecast. 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 3.0m 17s and forecast to arrive on Monday (Aug 24) at 9PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Tuesday (Aug 25) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Tue 18th Aug) | 3ft (0.9m) 8s |
| Best Surf | 9PM (Mon 24th Aug) | 10ft (3.0m) 17s |
| Most Powerful | 9PM (Mon 24th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Shida over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s talk about what’s happening at Shida over the next couple of weeks.
Right off the bat, it’s pretty flat and forgettable. The first proper action doesn’t show up until around Saturday the 22nd when the swell finally starts building and the wind swings offshore. Before that, it’s small, weak, and ordinary. The big standout window is from Monday the 24th into Wednesday the 26th – that’s the best quality, but you need to know what you’re doing.
Tuesday morning the 18th at Shida: 0.9m swell from the ESE, 8-second period – short and weak. Combined energy is 188 (weak). Water temp is 27°, normal for this time of year. Light cross‑off breeze keeps it clean but it’s nothing to get excited about. Tuesday afternoon and Wednesday are even smaller – 0.5-0.7m, still cross‑shore or light cross‑off.
Thursday the 20th is 0.4m from the SE with a little more period (10-11 seconds) but energy is tiny (under 90). Friday the 21st is the first day with offshore wind – light SSW morning, then gentle offshore in the arvo. Swell is 0.6m from the east, 8-second period, with moderate energy (125-128). Clean but small. Saturday the 22nd: morning 0.8m from the east, then afternoon picks up to 0.9m from the ESE, 10-second period, gentle offshore. Energy hits 216 (moderate) and it’s called good surf. Sunday the 23rd is similar – 0.9-0.8m, offshore breezes, energy around 200.
Now for the real stuff. Monday the 24th of August: morning 2.3m swell from the SSE with a long 16-second period – that’s proper groundswell. Combined energy is 2976 (strong). Light cross‑off wind, clean. Afternoon goes 2.5m from the same direction, 16 seconds, energy 3388, gentle offshore. Excellent for experienced surfers – at 2.5m it’s too big for beginners. The long period means better shape but watch out at the beach break; it’ll shine at the point or reef. Crowds are often possible here.
Tuesday the 25th: morning 3.0m from the SSE, 15 seconds, glassy with light wind. Energy 3739 (very strong). File says it’s predicted to be too big for this break – only for the brave. Afternoon drops to 2.5m, still solid. Wednesday the 26th holds at 2-2.5m from the S, 14-15 seconds, cross‑off, energy around 2600. Thursday the 27th backs to 1.7m from the S, 14 seconds, good for experienced surfers. Friday the 28th is 1.6m from the S, 13 seconds, but wind picks up and afternoon gets cross‑shore with chop.
After that it goes downhill. Saturday the 29th has fresh breeze, 2-1.7m from the S, energy dropping. Sunday the 30th is poor – strong breeze, cross‑shore, messy chop, short 7-8 second swell. Monday the 31st sees a huge 4-5.0m SE swell – way too big, energy 16067. Tuesday the 1st of September is 3.5m, then Wednesday the 2nd drops to 2-2.2m with marginal conditions.
The clear standout is Monday the 24th of August through Wednesday the 26th – big, clean, powerful, and for experienced surfers only.
Stay safe, Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Tue morning, min 24°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 21mm), heaviest during Fri night. Warm (max 28°C on Fri morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | ESE 8 | E 8 | E 8 | SE 10 | E 9 | E 9 | SE 10 | SE 11 | E 8 | E 8 | E 8 | E 9 | E 9 | ESE 10 | E 10 | E 10 | E 9 | SSE 16 | SSE 16 | SSE 16 | SSE 16 |
Wave Graph | |||||||||||||||||||||
119 | 61 | 47 | 35 | 36 | 36 | 39 | 40 | 47 | 49 | 50 | 56 | 106 | 160 | 200 | 151 | 109 | 691 | 2781 | 3113 | 3957 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | off | off | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-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 | 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 | 8:00AM0.35m | 8:31PM1.08m | ||||||||||
4:58 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | 2 | 3 | 3 | 6 | 1 | 2 | 4 | 1 | — | — |
Temp °C | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 27 | 30 | 29 | 29 | 30 | 30 | 29 | 31 | 30 | 29 | 30 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | ESE 8 | E 8 | SE 6 | SE 6 | SE 6 | SE 6 | SE 5 | E 8 | E 8 | E 8 | E 8 | E 9 | E 9 | ESE 10 | E 10 | E 10 | E 9 | SSE 16 | SSE 16 | SSE 16 | SSE 16 |
119 | 61 | 31 | 23 | 28 | 25 | 14 | 33 | 47 | 49 | 50 | 56 | 106 | 160 | 200 | 151 | 109 | 691 | 2781 | 3113 | 3957 | |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 7 | E 8 | E 8 | E 9 | E 9 | E 8 | SE 11 | SE 11 | S 9 | S 9 | S 8 | S 5 | SSW 9 | SSW 9 | S 4 | S 4 | E 9 | E 11 | ESE 12 | ESE 11 |
37 | 21 | 47 | 35 | 36 | 36 | 34 | 40 | 40 | 39 | 38 | 36 | 15 | 28 | 28 | 13 | 13 | 78 | 160 | 215 | 151 | |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 5 | SSW 8 | SE 11 | SE 10 | SE 10 | S 9 | SE 10 | SSE 10 | SSW 9 | SE 13 | SSE 12 | SW 8 | SW 10 | E 14 |
6 | 37 | 36 | 35 | 35 | 35 | 39 | 11 | 14 | 40 | 37 | 36 | 45 | 28 | 10 | 27 | 84 | 94 | 35 | 14 | 58 | |
Wind waves Height (m) Direction Period (s) | SSE 6 | — | — | — | — | — | — | — | SSE 5 | — | S 3 | S 5 | — | S 4 | S 4 | SSW 4 | SSW 4 | SW 4 | — | SSW 8 | — |
26 | — | — | — | — | — | — | — | 6 | — | 6 | 15 | — | 14 | 12 | 19 | 20 | 7 | — | 46 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
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.











