Surf Forecasts:
Onjuku surf forecast from 26 Jul 2026:
- Best quality surf: Monday 27 Jul, 12AM (local time) - 1.5ft (0.4m), 14s period, SE swell with cross-offshore winds.
- Most powerful swell: Sunday 2 Aug, 9PM (local time) - 4.5ft (1.3m), 16s period, SE swell with 864 kJ wave energy.
- Next surfable swell (1★+): Sunday 26 Jul, 9PM (local time) - 1.5ft (0.4m), 14s 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 Sunday (Jul 26) at 9PM. The primary swell is predicted to be 0.4m and 14s period with a secondary swell of 0.8m and 6s. Another secondary swell of 0.5m and 10s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Onjuku in the next 16 days are 1.3m 16s and forecast to arrive on Sunday (Aug 02) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Monday (Jul 27) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 26th Jul) | 1.5ft (0.4m) 14s |
| Best Surf | 12AM (Mon 27th Jul) | 1.5ft (0.4m) 14s |
| Most Powerful | 9PM (Sun 2nd Aug) | 4.5ft (1.3m) 16s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down what's on the horizon.
It's gonna be a slow start for the next few days. We're looking at a flat spell with mostly poor conditions and not much to get the heart pumping. The water is sitting around 80.4°, which is pretty standard for this time of year, so you'll be fine in a shorty or even boardies if you're tough.
We've got a bit of a wait, but the real story is the big pulse of energy that's showing up in the long-range. Around the 2nd of August, things start to stir. On Sunday the 2nd, we see a clean little SE groundswell starting to push in, with the wave energy jumping to 414 (moderate). The wind is light and cross-off, keeping things tidy.
But the standout window is from Monday the 3rd through to the weekend of the 9th. A massive, long-period SE groundswell marches in. The combined swell energy climbs from 1388 on Monday the 3rd all the way up to 61587 by Saturday the 8th. That's very strong energy. Now, this is a beach break setup, and with those 15-17 second intervals, the swell will be very powerful and lined up but prone to closing out on a beach. The wind looks good, with offshore and cross-off conditions through the peak of it, which will make it look perfect.
Keep in mind, once we get past Tuesday the 4th, the swell is forecast to be over 8 feet. By Wednesday the 5th, we're talking about 10-foot sets, and it just keeps building. This is expert-only territory. For the average surfer, this will be way too big and relentless. The early part of that swell, say Monday and Tuesday, with chest to head-high waves, would be the best bet for the confident intermediate surfer.
The second week is hammered by a giant, relentless swell that will be too much for the vast majority. It's a real shame the timing is such because the quality is there, but the size will shut it down for everyone but the brave. It's a promising but less certain long-range call.
Short Range ForecastHeavy rain (total 39mm), heaviest during Tue afternoon. Warm (max 28°C on Sun afternoon, min 23°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Sat morning, min 24°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | ||||||||||||||
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 7 | SE 14 | SE 10 | SE 10 | ENE 8 | E 8 | E 8 | E 7 | SSW 7 | SSW 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSE 9 | ESE 10 | ESE 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 74 | 72 | 51 | 61 | 163 | 121 | 100 | 52 | 63 | 52 | 102 | 223 | 140 | 83 | 63 | 45 | 33 | 44 | 34 | 63 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-off | cross-off | cross-off | off | cross | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross-off | glassy | cross-on | on | cross-on | cross-on | on | cross-off |
High Tide | 4:42PM1.19m | 1:35AM1.28m | 5:00PM1.23m | 2:32AM1.33m | 5:21PM1.27m | 3:19AM1.38m | 5:42PM1.30m | 4:01AM1.42m | 6:03PM1.32m | 4:41AM1.43m | 6:23PM1.34m | 5:20AM1.41m | 6:44PM1.36m | |||||||
Low Tide | 8:40PM1.07m | 9:26AM0.23m | 9:28PM1.02m | 10:04AM0.17m | 10:04PM0.97m | 10:37AM0.13m | 10:38PM0.90m | 11:08AM0.12m | 11:11PM0.83m | 11:38AM0.14m | 11:45PM0.75m | 12:06PM0.20m | 00:21AM0.68m | |||||||
 |  |  |  |  | |  | | |  |  | | | | | | | | | | |
 | — | — | 4:43 | — | — | 4:43 | — | — | 4:43 | — | — | 4:45 | — | — | 4:46 | — | — | 4:46 | — | — |
 | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — |
mm | 5 | 14 | 1 | — | 1 | 4 | 9 | 5 | — | — | — | — | — | — | — | — | — | — | 1 | 1 |
Temp °C | 28 | 26 | 26 | 26 | 24 | 27 | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 28 | 28 | 27 | 30 | 29 | 27 |
Feels °C | 32 | 30 | 25 | 26 | 25 | 30 | 30 | 30 | 28 | 30 | 27 | 27 | 28 | 29 | 30 | 30 | 31 | 34 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | E 7 | E 6 | SE 10 | SE 10 | ENE 8 | E 8 | E 8 | E 7 | SSW 7 | SSW 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSE 9 | SE 8 | ESE 10 |
| kJ | 74 | 49 | 51 | 61 | 163 | 121 | 100 | 52 | 63 | 52 | 102 | 144 | 140 | 83 | 63 | 45 | 33 | 44 | 21 | 63 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | NE 10 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | E 6 | ENE 7 | SSW 7 | SSW 7 | SSW 7 | S 7 | S 7 | SE 9 | SE 9 | ENE 8 | ENE 8 | SE 12 |
| kJ | 64 | 52 | 28 | 22 | 63 | 49 | 35 | 35 | 21 | 29 | 30 | 18 | 18 | 26 | 16 | 31 | 29 | 22 | 23 | 53 |
Swell 3 Height (m) Direction Period (s) | SE 15 | SE 14 | SSW 8 | SE 14 | SSW 8 | SSW 8 | SSW 8 | SSW 4 | SE 10 | SE 10 | SE 9 | SE 10 | SE 10 | SE 10 | SE 9 | SSE 5 | E 11 | ESE 10 | ESE 10 | ENE 8 |
| kJ | 54 | 72 | 24 | 47 | 22 | 24 | 24 | 5 | 33 | 32 | 22 | 32 | 23 | 14 | 31 | 2 | 9 | 20 | 34 | 12 |
Wind waves Height (m) Direction Period (s) | SW 4 | ENE 6 | NE 6 | NE 6 | — | — | SSE 3 | — | — | NNE 3 | — | ENE 8 | — | — | — | S 3 | SSW 4 | SSW 4 | S 8 | S 6 |
| kJ | 1 | 70 | 46 | 80 | — | — | 2 | — | — | 2 | — | 223 | — | — | — | 7 | 4 | 6 | 33 | 17 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 9 | 0 | 56 | 56 | 0 | 56 | 9 | 0 | 0 | 51 | 15 | 206 | 0 | 0 | 17 | 9 | 9 | 9 | 9 | 0 |
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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