
Surf Forecasts:
Onjuku surf forecast from 5 Jul 2026:
- Best quality surf: Wednesday 8 Jul, 6AM (local time) - 7.5ft (2.3m), 17s period, SE swell with cross-offshore winds.
- Most powerful swell: Saturday 11 Jul, 12AM (local time) - 7.5ft (2.3m), 17s period, S swell with 3,194 kJ wave energy.
- Next surfable swell (1★+): Tuesday 7 Jul, 6AM (local time) - 3ft (0.9m), 14s period with SSE 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 07) at 6AM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 1.0m and 6s. 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 2.3m 17s and forecast to arrive on Saturday (Jul 11) at 12AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 6s period and expected on Tuesday (Jul 07) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 7th Jul) | 3ft (0.9m) 14s |
| Best Surf | 6AM (Wed 8th Jul) | 7.5ft (2.3m) 17s |
| Most Powerful | 12AM (Sat 11th Jul) | 7.5ft (2.3m) 17s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, Rusty here again, this time in feet and miles, looking at the Onjuku stretch.
We're starting off quiet with no real surf until Monday the 6th of July. That first little bump is weak, and the wind is a cross-onshore mess, so it's nothing to rush out for.
The main event is clear: Wednesday morning, July the 8th. The swell jumps up to about 8ft from the SE with a real long 16-second period. The combined energy is pumping at (3067). The wind is light and cross-offshore from the ENE, so it’s going to be clean, powerful, and lined up. This is expert territory only—way too big for beginners. The water is sitting at 72°, which is more than 4 degrees colder than average, so you want extra rubber. That's your one standout session.
After that, the wind goes bad. From Wednesday afternoon straight through to the following weekend, it’s mostly onshore or cross-onshore from the south or southwest. The swell holds up through Thursday and Friday the 10th at around 6-7ft, but with that onshore wind, it’s going to be messy and lumpy. It's still rideable if you're hungry, but it won't be pretty.
Then comes a real dry spell. From Saturday the 11th all the way through to the next Saturday, the swell drops to 2-3ft or less. The wind keeps blowing onshore, and the wave energy falls to weak numbers, mostly under 500. That’s almost a full week of small, choppy junk.
The only other thing on the horizon is around Monday the 20th and Tuesday the 21st. The swell builds back to about 7ft from the east, with moderate energy in the 1000-1200 range. But the wind is still cross-onshore from the southwest, so it will be fairly choppy again. It's a long way out, so don't bet the farm on it.
Onjuku is an inconsistent spot anyway, so a run like this is pretty normal. Wednesday the 8th morning is the only true standout. Everything else is a battle with the breeze.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon night. Warm (max 24°C on Tue morning, min 22°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Thu afternoon, min 23°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | |||||||||||||||
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 7 | SE 16 | SE 14 | SE 15 | SE 14 | SE 13 | SE 16 | SE 16 | SSE 16 | SSE 14 | S 16 | S 15 | S 16 | S 16 | S 17 | S 17 | S 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 |
Wave Graph | |||||||||||||||||||||
140 | 362 | 466 | 784 | 1238 | 1067 | 2831 | 2322 | 2961 | 1637 | 2417 | 2040 | 2136 | 2109 | 3194 | 2900 | 2141 | 1664 | 1055 | 678 | 425 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross | glassy | cross | cross-on | on | on | on | on | on | on | on | on | on | on |
High Tide | 8:56PM1.32m | 8:39AM1.09m | 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 | ||||||||
Low Tide | 2:06PM0.43m | 3:11AM0.70m | 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 | ||||||||
4:28 | — | — | 4:30 | — | — | 4:30 | — | — | 4:31 | — | — | 4:31 | — | — | 4:31 | — | — | 4:33 | — | — | |
— | 6:55 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 22 | 24 | 24 | 22 | 24 | 24 | 23 | 24 | 25 | 23 | 25 | 24 | 23 | 24 | 24 | 23 | 25 | 25 | 24 |
Feels °C | 22 | 22 | 22 | 23 | 24 | 23 | 24 | 25 | 25 | 26 | 26 | 24 | 26 | 24 | 24 | 24 | 23 | 23 | 25 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 13 | SE 7 | SE 14 | SE 15 | SE 14 | SE 13 | SE 16 | SE 16 | SSE 16 | SSE 14 | S 16 | S 15 | S 16 | S 16 | S 17 | S 17 | S 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 |
140 | 135 | 466 | 784 | 1238 | 1067 | 2831 | 2322 | 2961 | 1637 | 2417 | 2040 | 2136 | 2109 | 3194 | 2900 | 2141 | 1664 | 1055 | 678 | 425 | |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 16 | SE 7 | ESE 7 | SSE 20 | SSE 16 | S 22 | S 19 | S 16 | S 18 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 |
19 | 362 | 106 | 77 | 154 | 667 | 236 | 744 | 1440 | 621 | 77 | 103 | 96 | 67 | 59 | 59 | 56 | 39 | 55 | 56 | 40 | |
Swell 3 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 7 | WSW 6 | NE 8 | SSE 13 | — | S 19 | S 20 | ESE 8 | ESE 8 | ESE 9 | E 10 | ESE 10 | E 9 | — | SSE 11 | SE 15 | SE 10 | SE 10 | SE 10 |
21 | 20 | 10 | 4 | 2 | 444 | — | 854 | 274 | 113 | 96 | 123 | 30 | 125 | 85 | — | 45 | 8 | 27 | 16 | 28 | |
Wind waves Height (m) Direction Period (s) | SE 7 | — | SE 7 | ESE 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 3 | SSE 5 |
124 | — | 89 | 82 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 28 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 103 | 68 | 51 | 51 | 68 | 0 | 0 | 9 | 0 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 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.










