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Kuminatu surfForecast / Chiba / Japan
12 Day Weather and Surf, issued 2 am Sunday 12 Oct 2025 JST
Best Forecast Surf Conditions for Kuminatu this week:
The surf forecast for Kuminatu over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Oct 12) at 9PM. The primary swell is predicted to be 1.5m and 7s period with a secondary swell of 1.2m and 7s. Another secondary swell of 0.4m and 7s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Kuminatu in the next 12 days are 2.5m 11s and forecast to arrive on Friday (Oct 17) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Monday (Oct 13) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 12th Oct) | 5ft (1.5m) 7s |
| Best Surf | 12AM (Sat 18th Oct) | 6ft (1.9m) 11s |
| Most Powerful | 6PM (Fri 17th Oct) | 8ft (2.5m) 11s |
Table - best surf conditions forecast for Kuminatu over the next 12 days.
Short Range Forecast Light rain (total 9mm), mostly falling on Tue night. Warm (max 23°C on Sun morning, min 18°C on Tue night). Winds decreasing (fresh winds from the NNE on Mon morning, calm by Tue night). | Days 3-6 Weather Summary Light rain (total 4mm), mostly falling on Thu night. Warm (max 24°C on Wed afternoon, min 18°C on Wed morning). Winds decreasing (strong winds from the NNE on Thu night, calm by Fri night). | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 8 | 8 | 10 | 12 | 11 | 9 | 8 | 8 | 9 | 9 | 9 | 10 | 10 | 10 | 6 | 10 | 11 | 11 | 10 | 10 | 11 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 300 | 258 | 273 | 569 | 1616 | 446 | 300 | 270 | 260 | 508 | 554 | 511 | 348 | 290 | 170 | 1028 | 1016 | 823 | 382 | 316 | 214 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | glass | cross- on | cross- on |
High Tide / height (m) | 6:36PM 1.54 | 10:19AM 1.20 | 7:07PM 1.45 | 1:03PM 1.20 | 7:49PM 1.32 | 1:56PM 1.25 | 10:38PM 1.19 | 2:18PM 1.31 | 1:02AM 1.23 | 2:40PM 1.37 | 2:13AM 1.32 | 3:00PM 1.43 | |||||||||
Low Tide / height (m) | 12:56PM 1.07 | 2:23AM 0.23 | 1:20PM 1.14 | 3:35AM 0.36 | 1:59PM 1.20 | 5:08AM 0.46 | 7:06PM 1.15 | 6:39AM 0.50 | 8:08PM 0.99 | 7:44AM 0.51 | 8:41PM 0.81 | 8:31AM 0.52 | 9:10PM 0.65 | ||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
| Sunrise | 5:41 | - | - | 5:41 | - | - | 5:43 | - | - | 5:43 | - | - | 5:45 | - | - | 5:45 | - | - | 5:46 | - | - |
| Sunset | - | 5:08 | - | - | 5:07 | - | - | 5:06 | - | - | 5:05 | - | - | 5:04 | - | - | 5:01 | - | - | 5:00 | - |
 | |  |  |  |  | | |  | |  |  | | |  | | | | | | | |
Rain (mm) | - | - | 2 | 1 | - | - | - | - | 6 | 1 | - | - | - | - | 3 | - | - | - | - | - | - |
| Temp. °C | 23 | 23 | 23 | 22 | 22 | 20 | 22 | 22 | 22 | 21 | 24 | 21 | 23 | 24 | 23 | 21 | 20 | 20 | 22 | 23 | 23 |
| Feels °C (?) | 24 | 25 | 26 | 19 | 19 | 17 | 21 | 22 | 25 | 20 | 22 | 19 | 24 | 25 | 21 | 15 | 14 | 18 | 21 | 22 | 21 |
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Live Wave Height (m)
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Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Chiba
The wind is still offshore at Kuminatu (moderate winds from the NNW at Katsuura 7 km from Kuminatu). 1.5m 7s swell from the SSE with a 0.8m 9s swell from the E and a 0.6m 8s swell from the NE. 3 swells combining to make bigger set waves.
Actual: 49 min ago
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Kuminatu surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Kuminatu Surf forecast
The above surf forecast table for Kuminatu provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Kuminatu can be found by selecting the local surf guide option on the grey menu. Our Kuminatu 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 (Kuminatu) 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 Kuminatu 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.
Kuminatu is 6 km (4 miles) from Katsuura. If you plan a holiday in Chiba, look for hotels and other accommodation in Katsuura. Katsuura has rooms for a wide range of budgets as well as car hire and transport links.
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