Surf Forecasts:
Onjuku surf forecast from 7 Jul 2026:
- Best quality surf: Wednesday 8 Jul, 12AM (local time) - 5ft (1.6m), 13s period, SE swell with cross-offshore winds.
- Most powerful swell: Saturday 11 Jul, 3AM (local time) - 7ft (2.2m), 17s period, S swell with 2,798 kJ wave energy.
- Next surfable swell (1★+): Wednesday 8 Jul, 12AM (local time) - 5ft (1.6m), 13s period with SE swell.
Best Forecast Surf Conditions for Onjuku this week:
The surf forecast for Onjuku over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 08) at 12AM. The primary swell is predicted to be 1.6m and 13s period with a secondary swell of 1.1m and 17s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Onjuku in the next 16 days are 2.2m 17s and forecast to arrive on Saturday (Jul 11) at 3AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 8th Jul) | 5ft (1.6m) 13s |
| Best Surf | 12AM (Wed 8th Jul) | 5ft (1.6m) 13s |
| Most Powerful | 3AM (Sat 11th Jul) | 7ft (2.2m) 17s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, let's look at Onjuku in feet and miles. Tuesday July 7 sees a 5ft SE groundswell (15s) with a 12 mph NE cross-off – clean but just marginal. The standout is Wednesday July 8 morning: 7ft of SSE groundswell at 16 seconds, light ENE cross-off (6 mph), energy 2477 – that's proper heavy, only for the experienced crew. Water temp is 72°F, about 3°F colder than normal, so wear a 4/3.
Then it all goes south: from Thursday July 10 afternoon through to Saturday July 18 morning, mostly onshore winds and messy surf – a solid week-plus of nothing. Saturday July 18 morning offers a small glassy window: 4ft easterly swell (11s) under calm conditions – tiny but fun. The next real gem is Wednesday July 22 morning: 5ft S groundswell (13s) with glassy north winds (3 mph), energy 1796 – excellent for experienced surfers. That's the long-range promise, though it's still a couple weeks off.
Keep your eyes on July 8 morning – that's the one. Rusty.
Short Range ForecastSome drizzle, heaviest during Tue morning. Warm (max 25°C on Thu morning, min 22°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Sun morning, min 24°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | |||||||||||||||
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) | SE 15 | SE 14 | SE 13 | SE 16 | SSE 15 | SSE 15 | SSE 14 | SSE 13 | S 15 | S 15 | S 16 | S 17 | S 16 | S 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 12 | SSW 12 | SSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 856 | 1048 | 892 | 2320 | 2140 | 1559 | 1179 | 828 | 1881 | 1847 | 2310 | 2701 | 2373 | 2323 | 1643 | 1163 | 867 | 437 | 133 | 186 | 98 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross-on | on | on | on | on | on | on | cross-on | on | on | cross-on | cross-on | on | on | cross-on | on | cross-on |
High Tide | 9:27PM1.32m | 10:09AM1.02m | 10:03PM1.33m | 12:13PM1.01m | 10:46PM1.33m | 2:21PM1.09m | 11:39PM1.34m | 3:42PM1.20m | 00:41AM1.37m | 4:34PM1.30m | 1:44AM1.42m | 5:16PM1.35m | 2:44AM1.47m | ||||||||
Low Tide | 2:42PM0.57m | 4:16AM0.61m | 3:24PM0.73m | 5:27AM0.49m | 4:20PM0.89m | 6:39AM0.36m | 5:47PM1.02m | 7:44AM0.22m | 7:27PM1.09m | 8:43AM0.08m | 8:45PM1.11m | 9:36AM-0.02m | 9:42PM1.09m | ||||||||
 |  |  |  | |  | | | | | | | | |  | | | | | | | |
 | 4:30 | — | — | 4:30 | — | — | 4:31 | — | — | 4:31 | — | — | 4:31 | — | — | 4:33 | — | — | 4:33 | — | — |
 | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 24 | 22 | 24 | 24 | 23 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 24 | 22 | 24 | 25 | 25 | 26 | 26 | 25 | 27 | 26 | 25 | 26 | 25 | 25 | 27 | 27 | 27 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | SE 15 | SE 14 | SE 13 | SE 16 | SSE 15 | SSE 15 | SSE 14 | SSE 13 | S 15 | S 15 | S 16 | S 17 | S 16 | S 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 12 | SSW 12 | SSW 11 |
| kJ | 856 | 1048 | 892 | 2320 | 2140 | 1559 | 1179 | 828 | 1881 | 1847 | 2310 | 2701 | 2373 | 2323 | 1643 | 1163 | 867 | 437 | 133 | 186 | 98 |
Swell 2 Height (m) Direction Period (s) | ESE 6 | SSE 20 | SSE 17 | E 8 | E 8 | E 8 | ESE 8 | S 15 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | S 9 | ESE 9 | ESE 9 |
| kJ | 42 | 154 | 675 | 153 | 142 | 127 | 107 | 770 | 85 | 92 | 89 | 86 | 59 | 41 | 40 | 39 | 39 | 39 | 39 | 45 | 26 |
Swell 3 Height (m) Direction Period (s) | NE 7 | ENE 6 | — | — | — | E 8 | S 18 | ESE 8 | — | — | ESE 10 | ESE 9 | — | SSE 9 | SE 15 | SSE 10 | SE 10 | SE 10 | E 9 | SE 10 | SE 12 |
| kJ | 23 | 8 | — | — | — | 157 | 308 | 101 | — | — | 157 | 115 | — | 59 | 8 | 41 | 26 | 24 | 40 | 15 | 24 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 4 | S 4 | S 4 | S 4 | S 4 | S 5 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | 14 | 16 | 18 | 16 | 36 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 51 | 51 | 0 | 0 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 88 | 17 | 9 | 57 | 143 | 9 |
Best forecast wave conditions in Chiba | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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Information about the Onjuku Surf forecast
The above surf forecast table for Onjuku provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Onjuku can be found by selecting the local surf guide option on the grey menu. Our Onjuku 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 (Onjuku) 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 Onjuku 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.
Onjuku is 3 km (2 miles) from 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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