
Surf Forecasts:
Onjuku surf forecast from 13 Jul 2026:
- Best quality surf: Saturday 18 Jul, 9AM (local time) - 3ft (0.9m), 10s period, SE swell with cross-offshore winds.
- Most powerful swell: Tuesday 21 Jul, 3AM (local time) - 4.5ft (1.3m), 11s period, E swell with 388 kJ wave energy.
- Next surfable swell (1★+): Tuesday 14 Jul, 3AM (local time) - 2.5ft (0.8m), 11s period with SSW 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 Tuesday (Jul 14) at 3AM. The primary swell is predicted to be 0.8m and 11s period with a secondary swell of 0.3m and 9s. Another secondary swell of 0.2m and 6s is also forecast. 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 1.3m 11s and forecast to arrive on Tuesday (Jul 21) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 14th Jul) | 2.5ft (0.8m) 11s |
| Best Surf | 9AM (Sat 18th Jul) | 3ft (0.9m) 10s |
| Most Powerful | 3AM (Tue 21st Jul) | 4.5ft (1.3m) 11s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking at the next couple of weeks here. Honestly, it’s a pretty quiet stretch for the most part. We’ve got a small window of half-decent waves, but you’ll have to be patient.
The first few days are a write-off. Tuesday the 14th through to Friday the 17th are all poor surf with onshore winds and weak, messy little waves. Nothing worth paddling out for.
Things finally start looking up on Saturday the 18th. The wind swings around to a cross-offshore breeze from the ENE, and the ocean cleans right up. The swell is a modest 3 ft from the SE, with a period of 10 seconds, and the combined swell energy is a moderate 261. It’s not huge, but it’s clean and surfable.
The best of the lot looks like the morning of Sunday the 19th. We’ve got that same clean cross-offshore wind, light breeze at 10 km/h, with a 3 ft swell from the east (8 seconds). The combined energy is a solid 219. It’s the only time in the whole run where the conditions line up properly for a decent session. If you’ve got a shortboard, that’s your window.
After that, it’s back to onshore slop and average conditions. The wind turns onshore again from the 20th onwards, and the surf quality drops right off. There’s a bit of a clean-up on the 24th and 25th with glassy mornings, but the swell is tiny – 2 ft to 1 ft – so it’s really only for the longboard or a foiler.
The last few days (27th to 29th) see a bit more energy, with a clean cross-offshore wind, but the swell is small and the periods are long, which means it’ll be a bit tricky to find a proper wave. The combined energy on the 27th afternoon hits 394, which is decent, but it’s a longer period groundswell, so it might be better suited to a point or reef than this beach break. It’s a maybe, not a guarantee.
Overall, the standout is the Sunday 19th morning session. That’s your best bet. Everything else is a bit of a gamble or just not worth the hassle.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue morning, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Thu night. Warm (max 27°C on Fri morning, min 24°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Mon 20 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | SSW 11 | S 11 | S 10 | S 10 | E 9 | SSW 9 | E 8 | E 8 | ESE 8 | ESE 8 | E 9 | E 8 | E 8 | SE 10 | SE 9 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 |
Wave Graph | |||||||||||||||||||||
213 | 116 | 80 | 71 | 40 | 88 | 71 | 64 | 92 | 94 | 119 | 90 | 86 | 154 | 113 | 146 | 135 | 140 | 165 | 137 | 137 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | on | cross-on | cross-on | on | on | on | on | on | on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | glassy | on |
High Tide | 2:44AM1.47m | 5:52PM1.37m | 3:40AM1.51m | 6:24PM1.37m | 4:33AM1.52m | 6:54PM1.36m | 5:24AM1.49m | 7:20PM1.34m | 6:15AM1.41m | 7:45PM1.33m | 7:06AM1.30m | 8:08PM1.33m | 8:01AM1.17m | ||||||||
Low Tide | 9:42PM1.09m | 10:24AM-0.09m | 10:29PM1.03m | 11:09AM-0.09m | 11:12PM0.96m | 11:51AM-0.03m | 11:55PM0.87m | 12:29PM0.08m | 00:40AM0.77m | 1:04PM0.23m | 1:26AM0.69m | 1:34PM0.40m | 2:16AM0.63m | 2:01PM0.57m | |||||||
— | 4:33 | — | — | 4:33 | — | — | 4:35 | — | — | 4:35 | — | — | 4:35 | — | — | 4:37 | — | — | 4:37 | — | |
6:53 | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:51 | |
mm | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 28 | 28 | 26 | 28 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 26 | 26 | 24 | 26 | 27 | 25 | 27 | 27 |
Feels °C | 31 | 31 | 31 | 29 | 30 | 28 | 27 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 27 | 29 | 30 | 29 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | S 11 | S 10 | S 10 | E 9 | E 9 | E 8 | E 8 | ESE 8 | ESE 8 | E 9 | E 8 | E 8 | SE 10 | E 8 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 |
213 | 116 | 80 | 71 | 40 | 38 | 71 | 64 | 92 | 94 | 119 | 90 | 86 | 154 | 113 | 146 | 135 | 140 | 165 | 137 | 137 | |
Swell 2 Height (m) Direction Period (s) | ESE 9 | ESE 9 | SE 10 | ESE 10 | SSW 10 | SSE 11 | SSE 9 | SE 9 | SW 8 | SE 10 | SE 10 | SE 9 | SE 9 | E 9 | SE 9 | SE 8 | SE 8 | SSE 8 | SSE 9 | SSE 9 | SSE 8 |
16 | 16 | 35 | 31 | 31 | 12 | 8 | 14 | 18 | 14 | 24 | 23 | 54 | 106 | 99 | 72 | 72 | 51 | 31 | 27 | 28 | |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SE 12 | E 10 | SE 10 | SE 10 | SE 9 | SE 11 | SSW 8 | SSE 10 | SSW 8 | SSW 8 | SSW 8 | SSE 4 | S 4 | SW 7 | S 9 | S 8 | SE 11 | SE 11 | S 8 | S 7 |
9 | 22 | 8 | 26 | 24 | 13 | 5 | 7 | 9 | 6 | 6 | 6 | 5 | 1 | 2 | 6 | 12 | 19 | 18 | 5 | 4 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SSW 3 | SSW 9 | S 4 | S 5 | SSW 4 | S 4 | SSE 4 | SSE 4 | ESE 3 | — | — | — | — | SE 2 | — | — | — |
— | — | — | — | 1 | 88 | 30 | 40 | 34 | 18 | 14 | 11 | 1 | — | — | — | — | 1 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 9 | 9 | 17 | 9 | 143 | 9 | 9 | 9 | 9 | 9 | 9 | 0 | 0 | 0 | 0 | 9 | 9 | 0 | 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.











