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Surf Forecasts

Kuminatu surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 8 pm Friday 09 May 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
17.0° C
 (Which is 3.0°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 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (May 11) at 12PM. The primary swell is predicted to be 2.1m and 8s period with a secondary swell of 0.9m and 9s. Another secondary swell of 0.1m and 11s is also forecast. The wind is predicted to be cross-shore as the swell arrives.

The most powerful waves expected at Kuminatu in the next 12 days are 3.5m 9s and forecast to arrive on Saturday (May 10) 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 1.3m 7s period and expected on Monday (May 12) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12PM (Sun 11th May)7ft (2.1m) 8s
Best Surf12PM (Sun 11th May)7ft (2.1m) 8s
Most Powerful12PM (Sat 10th May)11ft (3.5m) 9s

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

Hourly12 Days
Chiba Surf
Print Surf Table
Updates in  hr  min  s Forecast update imminent 
Saturday
10
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wed
21
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
3
3
2
2
1
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.6
SSE
3.5
S
3
SSW
3
SW
2.1
SW
1.8
SW
1.6
SW
0.9
ESE
0.9
ESE
0.6
E
0.5
E
0.5
E
0.4
E
1
ESE
1
ESE
1
SE
1.1
SE
1.1
SE
1.1
ESE
1.1
ESE
1
ESE
0.9
ESE
0.9
E
0.9
E
0.9
E
1.2
E
1.2
E
1.5
E
1.6
E
1.6
E
1.7
E
1.9
E
1.4
ENE
1.3
ENE
1
ENE
1
E
Period(s) (?)689988712121111101055578999999887889101091099
Wave
Graph
(?)Metric surfscale
Energy (?)16715081461127055342722822819686565131545257119136180176147137125125113187146272354398557654314289189180
Wind
(km/h)
25
S
45
S
35
SW
40
SW
25
WSW
25
SW
30
SW
15
WSW
5
ENE
10
E
10
ESE
10
SSW
10
SW
5
ESE
15
SE
15
S
15
SSE
20
S
20
SSW
20
SSW
20
S
15
S
15
SSW
5
SE
10
ESE
25
E
20
ENE
15
ENE
10
SSW
15
E
15
N
15
NNE
10
NE
5
NNW
5
SSE
15
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
ononcrosscrosscrosscrosscrosscrossglasscross-
on		cross-
on		cross-
on		crosscross-
on		oncross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		oncross-
on		cross-
on		crosscrosscross-
on		cross-
on		cross-
off		cross-
off		cross-
off		glassglasscross-
on
High Tide
/ height (m)
2:46AM
1.29
3:53PM
1.23
3:09AM
1.31
4:33PM
1.26
3:32AM
1.33
5:11PM
1.27
3:56AM
1.34
5:49PM
1.27
4:21AM
1.34
6:28PM
1.25
4:50AM
1.34
7:11PM
1.23
5:20AM
1.32
7:57PM
1.20
5:53AM
1.29
8:49PM
1.18
6:30AM
1.24
9:45PM
1.17
7:18AM
1.19
10:43PM
1.17
8:27AM
1.12
11:36PM
1.19
10:09AM
1.07
Low Tide
/ height (m)
9:23AM
0.27
9:25PM
0.62
9:51AM
0.15
9:58PM
0.66
10:20AM
0.06
10:30PM
0.71
10:50AM
0.00
11:02PM
0.76
11:22AM
-0.02
11:34PM
0.80
11:57AM
-0.01
12:08AM
0.84
12:34PM
0.02
12:45AM
0.88
1:16PM
0.07
1:29AM
0.92
2:03PM
0.14
2:26AM
0.95
2:58PM
0.23
3:46AM
0.93
4:02PM
0.32
5:18AM
0.85
5:12PM
0.41
Saturday
10
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wed
21
Sunrise-4:39--4:39--4:37--4:37--4:35--4:35--4:35--4:33--4:33--4:33--4:31--4:31-
Sunset--6:30--6:31--6:31--6:32--6:34--6:35--6:36--6:36--6:37--6:37--6:38--6:38
mod rainheavy rainlight rainpart cloudpart cloudcloudlight rainpart cloudpart cloudcloudcloudcloudpart cloudclearclearclearpart cloudcloudcloudcloudcloudcloudlight rainlight rainmod rainlight rainlight rainheavy rainlight rainlight raincloudpart cloudpart cloudcloudpart cloudclear
Rain (mm)
8154---2---------------426331222------
Temp. °C182121202021171918182020182020182019182020191817181919191819182120192021
Feels °C (?)141718131617111918181920171919171817161818181717161717191819172221202221

Short Range Forecast: Heavy rain (total 29mm), heaviest during Sat morning. Warm (max 21°C on Sat morning, min 16°C on Sun night). Winds decreasing (strong winds from the SW on Sat night, calm by Mon afternoon).

Days 3-6 Weather Summary Mostly dry. Warm (max 20°C on Tue morning, min 17°C on Mon night). Wind will be generally light.

Days 6-9 Weather Summary Moderate rain (total 18mm), heaviest on Sat morning. Warm (max 20°C on Fri morning, min 16°C on Sat morning). Wind will be generally light.

Long Range Forecast: Moderate rain (total 16mm), heaviest on Sun night. Warm (max 21°C on Tue morning, min 16°C on Wed night). Winds increasing (calm on Tue night, fresh winds from the NE by Wed night).

  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
<span class="translation_missing" title="translation missing: en.leaflet.map_placeholder_alt">Map Placeholder Alt</span>
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View detailed surf forecast for Kuminatu at:
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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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