Surf Forecasts:
Onjuku surf forecast from 14 Jul 2026:
- Best quality surf: Friday 17 Jul, 3AM (local time) - 2.5ft (0.8m), 9s period, E swell with cross-offshore winds.
- Most powerful swell: Friday 17 Jul, 12PM (local time) - 3ft (0.9m), 9s period, ESE swell with 134 kJ wave energy.
- Next surfable swell (1★+): Friday 17 Jul, 3AM (local time) - 2.5ft (0.8m), 9s period with E 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 Friday (Jul 17) at 3AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.6m and 4s. 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 0.9m 9s and forecast to arrive on Friday (Jul 17) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Monday (Jul 20) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 17th Jul) | 2.5ft (0.8m) 9s |
| Best Surf | 3AM (Fri 17th Jul) | 2.5ft (0.8m) 9s |
| Most Powerful | 12PM (Fri 17th Jul) | 3ft (0.9m) 9s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what's on the cards for the local stretch.
Straight up, the next week and a half is looking pretty flat and ordinary. We’ve got small, weak surf and onshore winds making a mess of things for the most part. It’s a long wait for the real action.
The first real sniff of anything comes on the morning of Friday, July 17th. Onjuku will have a small 3ft swell from the east at 9 seconds, but the wind is off-shore, so it’ll be clean. The water’s sitting at about 77°, which is pretty much average for the time of year. The real story is the wait. We have a long, drawn-out period of nothing until we get to the following week.
The standout window is the last few days of the month. On Monday, July 27th, you’ll see a solid 5ft swell from the southeast, with a very long 15-second period. This is real groundswell energy building, with the combined energy hitting 1335 (strong). The wind is light, so it’s not going to be blown out. It’s getting big, so this is for the confident crew.
Then hold onto your boards. Wednesday, July 29th is the pick of the entire forecast. We’re talking a proper 10ft to 12ft southeast swell, with that 18-second period – that’s very long period energy, and the combined energy is massive (6509). The wind is off-shore, which is a dream for a spot that usually gets onshore. This is expert territory only. It’s going to be a big, powerful, clean set-up, but if you’re not on your game, it will chew you up. This is the one to circle.
So, a long slow start, but a real finish on the horizon. It’s a waiting game, but it should be worth it.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Tue morning, min 25°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Fri morning. Warm (max 29°C on Fri afternoon, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||
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) | SSW 11 | S 10 | S 10 | E 9 | E 8 | E 8 | SSW 6 | ESE 8 | E 9 | E 9 | ESE 8 | E 8 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 | E 8 | ENE 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 123 | 80 | 50 | 39 | 32 | 92 | 97 | 94 | 101 | 127 | 120 | 90 | 88 | 74 | 74 | 95 | 102 | 97 | 68 | 90 | 88 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross-on | cross-on | on | on | cross-on | on | cross-on | cross-off | on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on |
High Tide | 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 | 8:32PM1.33m | ||||||||
Low Tide | 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 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:51 | — |
mm | — | — | — | — | — | — | — | — | — | 2 | 2 | 4 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 29 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 29 | 26 | 27 | 27 | 25 | 27 | 27 | 26 | 28 | 28 | 26 |
Feels °C | 32 | 30 | 29 | 30 | 30 | 28 | 31 | 30 | 29 | 33 | 32 | 29 | 29 | 29 | 28 | 30 | 30 | 30 | 32 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | S 10 | S 10 | E 9 | E 8 | E 8 | SSW 5 | ESE 8 | E 9 | E 9 | ESE 8 | E 8 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 | E 8 | SSE 8 | E 8 |
| kJ | 123 | 80 | 50 | 39 | 32 | 92 | 51 | 94 | 101 | 127 | 120 | 90 | 88 | 74 | 74 | 95 | 102 | 97 | 68 | 39 | 88 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | SE 12 | ESE 9 | SSW 10 | SSW 9 | SSW 9 | ESE 8 | SE 11 | S 4 | S 4 | SE 9 | SE 9 | SSE 5 | SE 9 | SSE 8 | SSE 8 | SE 9 | SSE 8 | SSE 7 | SE 11 | SSE 8 |
| kJ | 16 | 35 | 28 | 31 | 28 | 16 | 94 | 18 | 14 | 9 | 23 | 41 | 31 | 59 | 45 | 50 | 42 | 64 | 21 | 19 | 24 |
Swell 3 Height (m) Direction Period (s) | SE 12 | ESE 9 | SE 10 | SE 10 | ESE 9 | SSE 9 | SSW 9 | S 12 | SE 10 | SE 10 | SSW 8 | SSW 8 | SE 9 | SE 13 | S 8 | SE 10 | S 8 | SE 12 | SSE 9 | — | SSE 11 |
| kJ | 22 | 17 | 26 | 24 | 8 | 8 | 7 | 3 | 25 | 24 | 6 | 6 | 61 | 7 | 6 | 48 | 10 | 21 | 16 | — | 13 |
Wind waves Height (m) Direction Period (s) | — | — | SSW 2 | SSW 3 | S 3 | S 4 | SSW 6 | SSW 5 | SSW 5 | — | S 4 | SE 4 | — | SSE 5 | SSE 5 | SSE 5 | SSE 8 | — | NE 3 | ENE 8 | — |
| kJ | — | — | 1 | 2 | 5 | 15 | 97 | 46 | 28 | — | 3 | 15 | — | 19 | 31 | 17 | 44 | — | 4 | 90 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 9 | 9 | 9 | 9 | 9 | 17 | 9 | 9 | 0 | 9 | 103 | 103 | 598 | 9 | 9 | 9 | 9 | 9 | 17 | 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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