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Surf Forecasts:

Kuminatu surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 2 am Monday 25 Aug 2025 JST
Forecast 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
27.0° C
 (Which is normal for this time of year)

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 Thursday (Aug 28) at 6AM. The primary swell is predicted to be 0.5m and 9s period with a secondary swell of 0.2m and 8s. Another secondary swell of 0.8m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Kuminatu in the next 12 days are 1.0m 8s and forecast to arrive on Sunday (Aug 31) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 5s period and expected on Thursday (Aug 28) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Thu 28th Aug)1.5ft (0.5m) 9s
Best Surf 6AM (Thu 28th Aug)1.5ft (0.5m) 9s
Most Powerful 3AM (Sun 31st Aug)3.5ft (1.0m) 8s

Table - best surf conditions forecast for Kuminatu over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Mostly dry. Warm (max 30°C on Mon morning, min 26°C on Mon night). Winds decreasing (fresh winds from the SW on Wed morning, calm by Wed night).

Days 3-6 Weather Summary Some drizzle, heaviest during Thu afternoon. Warm (max 30°C on Sat morning, min 25°C on Thu night). Wind will be generally light.

Monday
25
Tuesday
26
Wednesday
27
Thursday
28
Friday
29
Saturday
30
Sunday
31
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.4
SE
0.4
ESE
0.3
ESE
0.4
ESE
0.7
SSW
0.4
ESE
1
SW
1.1
SW
1.1
SW
0.5
ESE
0.4
SE
0.5
SE
0.6
SE
0.4
SE
0.5
SE
0.5
ESE
0.5
ESE
0.5
SE
0.9
SSW
0.9
S
1.1
SSW
Period(s) (?)9888410555910911111110910776
Wave
Graph
(?)Metric surfscale
Energy (?)5340353935768110410199596612193147130108150170151136
Wind
(km/h)
5
ESE
10
S
10
SW
15
SSW
25
SSW
30
SW
30
SW
30
SW
25
SW
20
NE
20
NE
10
N
10
SSW
20
SSW
25
SW
20
WSW
25
SW
20
SW
20
SW
25
SW
25
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		crosscross-
on		cross-
on		cross-
on		cross-
on		cross-
on		crosscross-
off		cross-
off		offcross-
on		cross-
on		crosscrosscross-
on		crosscrosscross-
on		cross-
on
High Tide
/ height (m)
6:10PM
1.50
5:58AM
1.51
6:28PM
1.50
6:34AM
1.44
6:45PM
1.49
7:11AM
1.35
7:02PM
1.47
7:52AM
1.25
7:21PM
1.44
8:43AM
1.13
7:39PM
1.39
10:19AM
1.03
7:59PM
1.34
Low Tide
/ height (m)
11:48AM
0.30
12:00AM
0.59
12:14PM
0.40
12:29AM
0.53
12:38PM
0.52
12:59AM
0.48
1:01PM
0.64
1:33AM
0.47
1:21PM
0.76
2:12AM
0.48
1:36PM
0.88
3:04AM
0.52
1:32PM
0.99
Monday
25
Tuesday
26
Wednesday
27
Thursday
28
Friday
29
Saturday
30
Sunday
31
Sunrise5:05--5:05--5:07--5:07--5:07--5:09--5:09--
Sunset-6:15--6:15--6:13--6:12--6:10--6:08--6:07-
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
thunderstorm
part cloud
clear
part cloud
clear
part cloud
clear
clear
clear
clear
clear
Rain (mm)
----------1----------
Temp. °C302927302927292927282725282926303026303027
Feels °C (?)343331312928292927292927293027313127313129
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Chiba

  1. weather stationWind Update Continuing clean conditions at Kuminatu (calm at Katsuura 7 km from Kuminatu). 0.5m 8s swell from the ESE with a 0.3m 3s local chop from the SW and a 0.2m 4s local chop from the SSW. 3 swells combining to make bigger set waves.

    1 hour 7 minutes ago Kuminatu
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<
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1 h 7 min ago

2 km/h
S
Clean
Please reload the page to see if there are any updates.

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.

View detailed surf forecast for Kuminatu at:
surf-forecast.com

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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