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Surf Forecasts:

Kuminatu surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 8 pm Monday 12 Jan 2026 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
17.6° 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 Wednesday (Jan 14) at 3AM. The primary swell is predicted to be 3.0m and 9s period with a secondary swell of 0.2m and 13s. Another secondary swell of 0.2m and 11s 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 3.0m 9s and forecast to arrive on Wednesday (Jan 14) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 10s period and expected on Wednesday (Jan 14) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Wed 14th Jan)10ft (3.0m) 9s
Best Surf 3AM (Wed 14th Jan)10ft (3.0m) 9s
Most Powerful 3AM (Wed 14th Jan)10ft (3.0m) 9s

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. Very mild (max 14°C on Tue afternoon, min 6°C on Wed night). Winds decreasing (near gales from the WSW on Tue afternoon, calm by Wed afternoon).

Days 3-6 Weather Summary Some drizzle, heaviest during Sun afternoon. Very mild (max 14°C on Thu night, min 8°C on Fri night). Winds decreasing (strong winds from the WSW on Thu night, calm by Sat night).

Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Mon
19
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
3
2
2
1
0
0
2
0
1
0
1
1
0
0
1
1
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
2.2
SW
2.3
SW
2.5
SW
3
SW
1.8
SW
1.2
SW
1.1
SW
0.6
SW
1.4
SW
2.4
SW
1.6
SW
1.1
SW
0.6
SW
0.4
SW
1.3
SW
1.1
SW
0.2
ESE
0.4
SW
0.9
ENE
0.8
ENE
1
E
Period(s) (?)87791099867888777105556
Wave
Graph
(?)Metric surfscale
Energy kJ (?)65048575714746142351835413554730816546121671021010463669
Wind
(km/h)
30
WSW
45
SW
50
WSW
45
WSW
15
N
5
E
10
NNE
10
NW
25
WSW
45
WSW
10
NW
10
ENE
15
NNE
15
N
10
ENE
10
N
20
N
15
NE
5
ESE
15
WNW
30
WSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscrosscrosscrossoffglasscross-
off		offcrosscrosscross-
off		crosscross-
off		cross-
off		crossoffcross-
off		cross-
off		glasscross-
off		cross
High Tide
/ height (m)
2:18AM
0.95
11:08AM
1.21
3:48AM
1.05
12:21PM
1.19
4:28AM
1.14
1:32PM
1.21
4:58AM
1.21
2:27PM
1.25
5:23AM
1.26
3:12PM
1.30
5:47AM
1.29
3:52PM
1.36
6:10AM
1.33
4:30PM
1.40
Low Tide
/ height (m)
4:44AM
0.93
7:37PM
0.39
6:47AM
1.01
8:34PM
0.28
8:36AM
1.01
9:19PM
0.17
9:37AM
0.98
9:57PM
0.08
10:15AM
0.93
10:32PM
0.01
10:46AM
0.87
11:04PM
-0.03
11:16AM
0.82
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Mon
19
Sunrise-6:47--6:47--6:47--6:46--6:46--6:46--6:45-
Sunset--4:46--4:47--4:49--4:50--4:51--4:52--4:52
part cloud
clear
clear
clear
clear
clear
part cloud
cloud
cloud
clear
clear
clear
part cloud
part cloud
cloud
part cloud
cloud
rain showers
rain showers
clear
clear
Rain (mm)
-----------------14--
Temp. °C10131411998911141314101111111112121416
Feels °C (?)023-155455510104781078989
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

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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