Surf Forecasts:
Shida surf forecast from 13 Aug 2026:
- Best quality surf: Friday 14 Aug, 12AM (local time) - 5ft (1.6m), 10s period, E swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 12AM (local time) - 7ft (2.1m), 10s period, E swell with 951 kJ wave energy.
- Next surfable swell (1★+): Friday 14 Aug, 12AM (local time) - 5ft (1.6m), 10s 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 Friday (Aug 14) at 12AM. The primary swell is predicted to be 1.6m and 10s period with a secondary swell of 0.4m and 9s. 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 2.1m 10s and forecast to arrive on Monday (Aug 17) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Thursday (Aug 20) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 14th Aug) | 5ft (1.6m) 10s |
| Best Surf | 12AM (Fri 14th Aug) | 5ft (1.6m) 10s |
| Most Powerful | 12AM (Mon 17th Aug) | 7ft (2.1m) 10s |
Table - best surf conditions forecast for Shida over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s get into what the next fortnight has in store for us at Shida.
Alright, first thing’s first – it’s a slow start. The first week is a bit of a write-off, honestly. There’s a lot of wind that’s all kinds of wrong – cross-shore and cross-onshore – and the swell’s just not got any power behind it. The water’s sitting at a pretty warm 79°, just about average for this time of year, so that’s one thing you won’t have to worry about.
We kick off Thursday the 13th with a bit of a lumpy, messy 5ft easterly swell, energy’s moderate at best (454 to 528). With that risk of thunderstorms and onshore breeze, it’s not one to get excited about. This kind of mediocre run hangs around through to Sunday the 16th. There’s a bit more push in the water by Saturday morning with 6ft and energy climbing to 1016, but the moderate cross-shore chop just kills any quality. It’s a frustrating start.
Monday the 17th and Tuesday the 18th are where things start to get interesting. Monday’s still a bit messy with a 7ft easterly swell at 11 seconds. But then Tuesday brings our first real glimmer of hope. A shift to a light southerly offshore breeze on the 18th, with that swell dropping to a clean 4ft from the east. The energy has dropped right back to 268 – weak, but the clean conditions will make it feel better than the numbers suggest. It’s just surfable. Not a standout, but a relief.
From Wednesday the 19th into the following weekend, the swell drops right off. We’re looking at tiny, weak waves, 1ft to 3ft, with not much behind them. The wind does swing offshore a few times – mostly light – so the surface will be clean, but there’s just no grunt. The 21st has a brief 1ft pulse from the southeast at a long 10 seconds, but at that height you’re barely getting a ride. This is a definite lull.
Now, hold onto your board, because the real action kicks off Sunday the 23rd. This is the standout window. Sunday morning we get a proper groundswell arriving from the SSE, pushing 6ft but with a super long 15-second period. The energy jumps to 1243 – strong. And the wind? Gentle offshore from the south. It’s going to be clean and solid. By Sunday afternoon, it gets even better: 6ft from the SE, 14-second period, energy roaring up to 1822. And the wind goes glassy. That is about as good as it gets. The waves will be lined up, powerful, and clean.
Monday the 24th is the absolute peak. We’re looking at 8ft from the SE with a very long 15-second period. Energy is massive at 3288. The wind is glassy again in the morning. This is a serious swell – for experienced surfers only. It’s going to be powerful, with long lulls between sets. This is the one you point your car at. By Monday afternoon, it’s pushing 10ft with a 16-second period. The energy is off the charts at 4658, but at that size it might actually be too big for the break. Definitely one for experts.
Tuesday the 25th is still very large, with 13ft swells and energy over 7000. The wind is cross-offshore, so it’ll be clean, but that’s a huge, powerful ocean. Only for the brave. After that, the swell slowly eases, dropping back to a still-chunky 8ft on Wednesday the 26th, then fading out through the end of the month. The last days of the forecast, the 27th and 28th, see the swell die back to tiny, knee-high slop, with onshore winds returning.
So if you’re looking for the best of the best, it’s Sunday the 23rd and Monday the 24th. Sunday afternoon with that glassy offshore wind and 6ft of long-period groundswell is the dream. Monday morning’s 8ft glassy peak is for the crew who know what they’re doing. Get on it.
Rusty.
Short Range ForecastHeavy rain (total 28mm), heaviest during Thu night. Warm (max 28°C on Thu morning, min 24°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Tue afternoon, min 22°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | E 9 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | ESE 9 | E 10 | E 9 | E 10 | E 10 | E 11 | E 10 | E 10 | E 9 | E 9 | E 9 | ENE 9 | ENE 8 | S 9 |
Wave Graph | |||||||||||||||||||||
383 | 474 | 500 | 520 | 449 | 469 | 535 | 400 | 379 | 533 | 767 | 951 | 918 | 650 | 408 | 230 | 151 | 180 | 101 | 72 | 81 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross-on | cross | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | off | off | off | off | cross-off | cross-off | cross-off |
High Tide | 5:26PM1.45m | 4:22AM1.52m | 5:48PM1.46m | 5:10AM1.49m | 6:09PM1.47m | 5:56AM1.42m | 6:30PM1.47m | 6:42AM1.33m | 6:50PM1.46m | 7:30AM1.22m | 7:11PM1.44m | 8:25AM1.11m | 7:33PM1.41m | ||||||||
Low Tide | 10:34AM0.04m | 10:48PM0.78m | 11:09AM0.11m | 11:26PM0.65m | 11:41AM0.23m | 00:04AM0.55m | 12:10PM0.38m | 00:42AM0.48m | 12:36PM0.53m | 1:22AM0.44m | 12:59PM0.68m | 2:06AM0.43m | 1:18PM0.81m | 2:56AM0.45m | |||||||
4:54 | — | — | 4:56 | — | — | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | |
— | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:23 | — | — | 6:22 | — | |
mm | 1 | 2 | 11 | 1 | 1 | 11 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 26 | 27 | 27 | 25 | 27 | 27 | 25 | 26 | 26 | 24 | 26 | 25 | 25 | 27 | 28 | 26 | 29 | 29 | 27 |
Feels °C | 30 | 31 | 29 | 30 | 29 | 27 | 27 | 27 | 26 | 25 | 25 | 25 | 27 | 26 | 28 | 28 | 29 | 29 | 31 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 10 | E 10 | E 10 | E 10 | S 10 | ESE 9 | ESE 9 | E 10 | E 9 | E 10 | E 10 | E 11 | E 10 | E 10 | E 9 | E 9 | E 9 | ENE 9 | ENE 8 | S 9 |
383 | 474 | 500 | 520 | 449 | 70 | 400 | 400 | 379 | 533 | 767 | 951 | 918 | 650 | 408 | 230 | 151 | 180 | 101 | 72 | 81 | |
Swell 2 Height (m) Direction Period (s) | S 10 | S 10 | SSW 9 | SSW 9 | S 9 | S 12 | S 9 | S 10 | SE 9 | S 10 | S 10 | S 9 | SSW 8 | S 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ENE 8 |
71 | 48 | 28 | 28 | 41 | 11 | 41 | 53 | 85 | 48 | 30 | 25 | 24 | 22 | 28 | 27 | 26 | 26 | 35 | 35 | 53 | |
Swell 3 Height (m) Direction Period (s) | — | SE 12 | S 12 | SE 11 | SSE 11 | SSW 9 | SSW 11 | SSE 13 | S 9 | SE 12 | — | SE 11 | SE 16 | SE 16 | SSW 8 | S 8 | SSW 8 | S 8 | SSW 8 | SSW 8 | SE 10 |
— | 6 | 11 | 30 | 24 | 8 | 40 | 16 | 45 | 6 | — | 19 | 10 | 10 | 13 | 11 | 12 | 11 | 6 | 7 | 35 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | E 10 | E 10 | — | — | ENE 9 | — | — | — | — | — | — | SSW 3 | SSW 4 | S 4 | S 3 | SW 3 |
— | — | — | — | — | 469 | 535 | — | — | 443 | — | — | — | — | — | — | 2 | 4 | 8 | 8 | 5 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 63 | 0 | 17 | 63 | 63 | 115 | 74 | 23 | 63 | 63 | 3 | 17 | 115 | 0 | 0 | 0 | 0 | 0 | 1534 | 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.











