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Surf Forecasts:

Katagai surfForecast / Chiba / Japan

information circle16 Day Weather and Surf, issued 8 am Saturday 11 Apr 2026 JST
Forecast update in hr  min  s Forecast update imminent
Katagai surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Katagai sea temperature is
14.7° C
 (Which is 2.9°C colder than average for this time of year)

Best Forecast Surf Conditions for Katagai this week:

The surf forecast for Katagai over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Apr 12) at 12AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.4m and 9s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Katagai in the next 16 days are 2.1m 16s and forecast to arrive on Saturday (Apr 18) at 12AM. 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 Sunday (Apr 12) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Sun 12th Apr)3ft (0.9m) 9s
Best Surf 6AM (Wed 15th Apr)3.5ft (1.1m) 15s
Most Powerful12AM (Sat 18th Apr)7ft (2.1m) 16s

Table - best surf conditions forecast for Katagai over the next 16 days.

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
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Short Range Forecast Mostly dry. Warm (max 21°C on Sat morning, min 14°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Wed night. Very mild (max 18°C on Tue afternoon, min 10°C on Thu night). Winds increasing (calm on Tue night, strong winds from the NE by Thu afternoon).

Saturday
11
Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
17
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
4
0
1
1
0
0
0
0
0
0
0
1
2
1
1
2
0
1
2
2
2
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
2.5
SSW
1.1
SSE
0.9
SSE
0.5
SE
0.6
SE
0.5
SE
0.5
SE
0.6
ESE
0.6
SE
0.6
SE
0.8
SE
0.9
SE
1.1
SE
1.2
SE
1.4
SE
1.6
SE
1.4
SSE
1.5
SSE
1.7
SSE
1.7
SSE
2.1
SE
Period(s) (?)989111010101010101010151716151517171616
Wave
Graph
(?)Metric surfscale
Energy kJ (?)107615912955685353738580120167595874101810488071367165715432241
Wind
(km/h)
10
NW
25
E
15
NNE
0
ENE
25
S
15
SSW
15
S
20
SSE
5
SSW
10
E
15
ESE
10
SSE
10
SSE
15
SE
20
NE
25
NNE
40
NE
30
NE
15
ENE
15
ESE
10
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
on		cross-
off		glasscross-
on		cross-
on		cross-
on		cross-
on		crosscross-
on		cross-
on		cross-
on		cross-
on		oncrosscross-
off		cross-
off		crosscrosscross-
on		cross-
on
High Tide
/ height (m)
2:15AM
1.17
Low Tide
/ height (m)
5:33PM
0.49
7:40AM
1.03
Saturday
11
Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Sunrise5:11--5:09--5:09--5:07--5:05--5:05--5:03--
Sunset-6:07--6:07--6:07--6:08--6:09--6:10--6:12-
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
cloud
part cloud
part cloud
part cloud
part cloud
light rain
light rain
part cloud
part cloud
part cloud
cloud
cloud
Rain (mm)
--------------11-----
Temp. °C211817161616181817171818181816121211131415
Feels °C (?)20141611111515151616161617161484491114
  • Map Icons:
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  • 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 Katagai 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 Katagai at:
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Information about the Katagai Surf forecast

The above surf forecast table for Katagai provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Katagai can be found by selecting the local surf guide option on the grey menu. Our Katagai 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 (Katagai) 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 Katagai 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.

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