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Surf Forecasts:
Kuminatu surfForecast / Chiba / Japan
16 Day Weather and Surf, issued 8 pm Wednesday 15 Apr 2026 JSTForecast update in hr min s Forecast update imminent
Kuminatu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Kuminatu sea temperature is
15.9° C
(Which is 2.3°C colder than average for this time of year)Best Forecast Surf Conditions for Kuminatu this week:
The surf forecast for Kuminatu over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Apr 16) at 9PM. The primary swell is predicted to be 3.5m and 9s period with a secondary swell of 1.7m and 15s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Kuminatu in the next 16 days are 2.5m 15s and forecast to arrive on Sunday (Apr 19) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Thursday (Apr 16) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 16th Apr) | 11ft (3.5m) 9s |
| Best Surf | 9PM (Thu 16th Apr) | 11ft (3.5m) 9s |
| Most Powerful | 6PM (Sun 19th Apr) | 8ft (2.5m) 15s |
Table - best surf conditions forecast for Kuminatu over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Heavy rain (total 32mm), heaviest during Wed night. Very mild (max 17°C on Wed night, min 10°C on Thu night). Winds decreasing (strong winds from the NE on Thu afternoon, calm by Fri night). | Days 3-6 Weather Summary Mostly dry. Very mild (max 19°C on Tue afternoon, min 15°C on Sat night). Winds increasing (calm on Sat night, fresh winds from the SW by Tue afternoon). | |||||||||||||||||||||
Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wed 22 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 14 | 16 | 16 | 15 | 15 | 14 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 13 | 13 | 12 | 12 | 11 | 11 | 11 | 10 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 1319 | 1750 | 813 | 1358 | 1396 | 1340 | 2198 | 2368 | 2102 | 1666 | 2525 | 2742 | 2895 | 1657 | 1413 | 1217 | 993 | 686 | 460 | 308 | 231 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- off | cross- off | cross- off | cross- off | cross | cross- on | on | on | glass | cross- off | cross | glass | cross | cross- on | on | cross- on | cross | glass | cross- off | cross | |
High Tide / height (m) | 3:28AM 1.33 | 3:59PM 1.37 | 3:54AM 1.38 | 4:48PM 1.42 | 4:21AM 1.42 | 5:37PM 1.42 | 4:50AM 1.44 | 6:29PM 1.38 | 5:20AM 1.45 | 7:23PM 1.30 | 5:51AM 1.43 | 8:23PM 1.21 | 6:25AM 1.38 | |||||||||
Low Tide / height (m) | 9:22PM 0.32 | 9:43AM 0.19 | 10:00PM 0.38 | 10:19AM 0.01 | 10:37PM 0.47 | 10:56AM -0.12 | 11:14PM 0.58 | 11:37AM -0.20 | 11:50PM 0.69 | 12:20PM -0.20 | 12:24AM 0.80 | 1:06PM -0.14 | 12:58AM 0.88 | 1:58PM -0.03 | ||||||||
Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wed 22 | ||||||||||||||||
| Sunrise | - | 5:05 | - | - | 5:05 | - | - | 5:03 | - | - | 5:03 | - | - | 5:01 | - | - | 5:00 | - | - | 4:58 | - | |
| Sunset | - | - | 6:10 | - | - | 6:12 | - | - | 6:13 | - | - | 6:14 | - | - | 6:14 | - | - | 6:15 | - | - | 6:15 | |
 |  |  |  |  |  |  | | | | | |  | | | | | | | | | ||
Rain (mm) | 31 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Temp. °C | 17 | 16 | 14 | 12 | 13 | 13 | 14 | 17 | 17 | 16 | 18 | 18 | 17 | 17 | 17 | 16 | 18 | 19 | 16 | 17 | 18 | |
| Feels °C (?) | 16 | 8 | 5 | 3 | 8 | 9 | 12 | 15 | 15 | 15 | 15 | 15 | 17 | 14 | 14 | 14 | 13 | 14 | 14 | 15 | 18 | |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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 16 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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