Surf Forecasts:
Shida surf forecast from 21 Aug 2026:
- Best quality surf: Monday 24 Aug, 9AM (local time) - 4.5ft (1.3m), 19s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 12AM (local time) - 7.5ft (2.3m), 15s period, SSE swell with 2,258 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9AM (local time) - 2.5ft (0.8m), 11s 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 Saturday (Aug 22) at 9AM. The primary swell is predicted to be 0.8m and 11s period with a secondary swell of 0.7m and 5s. 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 2.3m 15s and forecast to arrive on Tuesday (Aug 25) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Friday (Aug 28) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sat 22nd Aug) | 2.5ft (0.8m) 11s |
| Best Surf | 9AM (Mon 24th Aug) | 4.5ft (1.3m) 19s |
| Most Powerful | 12AM (Tue 25th Aug) | 7.5ft (2.3m) 15s |
Table - best surf conditions forecast for Shida over the next 16 days.
The Lowdown
Righto, let’s have a look at what’s comin’ down the line for the next couple of weeks. The surf’s gonna be a bit of a mixed bag here, but there’s a couple of real standouts if you time it right.
The first good surf shows up on August 21st, but it’s nothing to write home about. Shida will have some small 1ft swell from the SE, with a bit of an offshore breeze, but the energy is weak and the conditions are just ordinary. The water is sitting at 81°, which is pretty much bang on average for this time of year.
Things start to get a bit more interesting on Saturday morning, the 22nd. The swell picks up a little to 3ft out of the east, with a nice 11-second period, and the wind is cross-offshore. The combined energy is moderate (201), and the session looks clean. That afternoon, there’s a risk of thunder storms, but the swell bumps up to 3ft (E) with a period of 11 seconds, and the energy jumps to 277. It’s still clean, so it’s a decent afternoon.
Sunday the 23rd is a write-off, with poor conditions and cross-onshore winds messing everything up. 2ft to 2ft, messy, choppy. Not worth paddling out.
Now, here’s the gem. August 24th. Monday morning is going to be absolutely magic. It’s glassy, flat calm, with a 4ft swell from the SSE and a very long period of 19 seconds. The combined energy is massive (1553), and this is for experienced surfers only. That’s a proper groundswell, and at a spot like Shida (which is inconsistent and exposed), this is a real treat. The afternoon stays clean with a 7ft swell from the SSE, 16-second period, and a gentle offshore breeze. Energy is off the charts at 2369. This is the best on offer, no question.
Tuesday the 25th keeps the good times rolling. Morning sees 6ft from the SSE, 13 seconds, clean with cross-offshore winds. The energy is still strong (2055). The afternoon holds 7ft from the south, 14 seconds, with a moderate offshore wind. Energy is 2007. Still excellent, but a notch below Monday.
Wednesday the 26th is still decent, but the size drops. Morning has 4ft from the south, 12 seconds, clean but with moderate energy (848). The afternoon is cleaner, 4ft from the south, 13 seconds, with a moderate offshore breeze. Energy is 788. Good, but not the standout.
The rest of the week into the second week gets a bit more ordinary. There are some punchy swells, but the wind starts to turn onshore or cross-onshore, making things messy. August 31st and September 1st see some bigger swell, 7ft and 7ft, but it’s cross-onshore and lumpy. Not worth it for paddle surfing. That setup looks more interesting for kite surfing than a traditional surf.
September 2nd afternoon has a glimmer of hope with 5ft from the east, 10 seconds, and a light cross-offshore breeze, keeping it clean. Energy is moderate (617). But it’s a brief window.
After that, from September 3rd, it’s a long stretch of poor conditions with cross-onshore winds and messy, choppy surf. The 4th and 5th are especially poor, with small swell and onshore winds. There’s a significant gap from the 3rd through to the 5th with no real recommendations.
So, to wrap it up: the absolute standout is Monday August 24th, with that glassy, long-period groundswell. Tuesday the 25th is also excellent. After that, pick your moments carefully. The break is inconsistent, so when it fires, it’s a real treat. Don’t bother with the last few days of the forecast.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Sat night. Warm (max 28°C on Fri afternoon, min 23°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Thu morning. Warm (max 29°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
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 11 | E 11 | E 10 | E 9 | SSE 12 | SSE 12 | SSE 19 | SSE 16 | SSE 15 | SSE 13 | S 14 | S 13 | S 12 | S 13 | SSW 12 | S 9 | S 9 | S 9 |
Wave Graph | ||||||||||||||||||||
39 | 41 | 151 | 233 | 161 | 83 | 104 | 196 | 1159 | 2107 | 2258 | 1077 | 1807 | 1228 | 513 | 408 | 164 | 210 | 282 | 235 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross-off | on | cross-on | cross-on | on | glassy | off | cross-off | cross-off | off | off | cross-off | off | off | off | off | off |
High Tide | 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 | 4:43PM1.40m | |||||||||
Low Tide | 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 | 9:54AM0.18m | 10:08PM0.78m | |||||||||
— | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | |
6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | |
mm | — | 1 | — | 3 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 7 |
Temp °C | 28 | 26 | 28 | 27 | 24 | 26 | 26 | 25 | 27 | 28 | 26 | 29 | 29 | 27 | 29 | 29 | 27 | 28 | 28 | 27 |
Feels °C | 29 | 28 | 30 | 30 | 27 | 28 | 28 | 29 | 29 | 30 | 28 | 30 | 30 | 30 | 30 | 31 | 30 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 9 | E 11 | E 11 | E 10 | E 9 | E 9 | SSE 12 | SSE 19 | SSE 16 | SSE 15 | SSE 13 | S 14 | S 13 | S 12 | S 13 | SSE 9 | E 14 | E 14 | E 13 |
35 | 41 | 151 | 233 | 161 | 83 | 60 | 196 | 1159 | 2107 | 2258 | 1077 | 1807 | 1228 | 513 | 408 | 99 | 153 | 232 | 222 | |
Swell 2 Height (m) Direction Period (s) | S 8 | SSW 9 | S 5 | S 5 | S 5 | SSW 9 | SSE 12 | ENE 9 | SSE 12 | E 12 | E 11 | S 15 | ESE 13 | ESE 13 | SSE 11 | ESE 12 | SSW 12 | SSW 11 | SW 11 | SE 14 |
36 | 25 | 22 | 17 | 7 | 15 | 104 | 82 | 222 | 134 | 89 | 780 | 184 | 176 | 218 | 113 | 164 | 49 | 29 | 8 | |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | SSW 9 | SSW 9 | SSW 9 | SE 10 | ESE 12 | ESE 12 | E 12 | ESE 15 | ESE 15 | ESE 14 | SW 10 | E 19 | ESE 12 | E 16 | E 12 | ESE 10 | SE 13 | SSE 9 |
39 | 36 | 28 | 27 | 26 | 16 | 56 | 50 | 172 | 47 | 42 | 198 | 16 | 7 | 117 | 46 | 70 | 33 | 7 | 35 | |
Wind waves Height (m) Direction Period (s) | S 3 | S 4 | SSW 5 | SSW 5 | NE 3 | NE 4 | ENE 4 | — | — | SSW 10 | SSW 10 | — | — | — | — | S 10 | S 5 | S 9 | S 9 | S 9 |
6 | 24 | 31 | 24 | 3 | 10 | 10 | — | — | 81 | 63 | — | — | — | — | 221 | 30 | 210 | 282 | 235 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 153 | 0 | 0 | 3 | 30 | 63 | 3 | 0 | 0 | 7 | 0 | 0 | 0 | 91 | 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.











