Katagai Surf Forecast

/ Chiba (19 surf breaks) /

Japan (129 surf breaks) / Lat Long: (35.53° N 140.46° E)

Surf Forecasts:

Katagai surfForecast / Chiba / Japan

12 Day Weather and Surf, issued 2 am Monday 25 Aug 2025 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 27.2° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Katagai this week:

The surf forecast for Katagai over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 28) at 3AM. The primary swell is predicted to be 1.0m and 5s period with a secondary swell of 0.6m and 5s. Another secondary swell of 0.5m and 9s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Katagai in the next 12 days are 1.0m 8s and forecast to arrive on Sunday (Aug 31) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Thursday (Aug 28) at 12PM.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	3AM (Thu 28th Aug)	3.5ft (1.0m) 5s
Best Surf	3AM (Thu 28th Aug)	3.5ft (1.0m) 5s
Most Powerful	6AM (Sun 31st Aug)	3.5ft (1.0m) 8s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Some drizzle, heaviest during Wed night. Warm (max 32°C on Wed morning, min 25°C on Wed night). Winds decreasing (fresh winds from the SSW on Tue afternoon, calm by Wed night).									Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Thu morning. Warm (max 33°C on Sat afternoon, 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
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	ESE	ESE	ESE	ESE	SE	ESE	ESE	S	ESE	ESE	SE	SE	SE	SE	SE	ESE	ESE	SE	S	S	S
Period(s) (?)	8	8	8	8	10	10	9	5	9	9	10	9	11	11	10	10	9	9	6	5	6
Wave Graph (?)
Energy (?)	25	30	29	33	46	63	63	85	66	41	52	46	90	86	82	98	88	89	130	87	74
Wind (km/h)	ENE	ESE	SSW	S	SSW	SSW	SSW	SSW	SW	NE	NE	N	S	SSW	SW	SW	SSW	SW	SSW	SSW	SSW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross	cross- on	glass	cross- on	cross- on	cross	cross	cross	cross	cross	cross	cross- off	glass	cross- on	cross	cross	cross- on	cross	cross- on	cross	cross
High Tide / height (m)		5:36PM 1.34		5:22AM 1.39	5:52PM 1.36		6:01AM 1.32		6:09PM 1.37	6:41AM 1.24		6:26PM 1.37	7:24AM 1.14		6:43PM 1.37	8:17AM 1.04		7:02PM 1.34	9:56AM 0.96		7:22PM 1.31
Low Tide / height (m)	11:16AM 0.28		11:26PM 0.54	11:41AM 0.39		11:59PM 0.47		12:03PM 0.51	12:33AM 0.43		12:23PM 0.63	1:09AM 0.42		12:39PM 0.75	1:49AM 0.44		12:49PM 0.85	2:41AM 0.47		12:30PM 0.94

	Monday 25			Tuesday 26			Wednesday 27			Thursday 28			Friday 29			Saturday 30			Sunday 31
Sunrise	5:03	-	-	5:03	-	-	5:05	-	-	5:05	-	-	5:07	-	-	5:07	-	-	5:07	-	-
Sunset	-	6:15	-	-	6:14	-	-	6:13	-	-	6:12	-	-	6:09	-	-	6:08	-	-	6:07	-

Rain (mm)	-	-	-	-	-	-	-	-	1	2	-	-	-	-	-	-	-	-	-	-	-
Temp. °C	28	28	27	31	31	27	32	31	28	27	27	25	28	31	27	31	33	28	33	34	28
Feels °C (?)	32	31	32	31	30	28	31	30	31	28	27	26	30	31	29	33	34	30	35	34	31

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Chiba

Wind Update Continuing clean conditions at Katagai (light winds from the NNW.(Wind varies from 300 to 010 degs) at New Tokyo International Airport 27 km from Katagai). 0.4m 8s swell from the ESE with a 0.3m 4s local chop from the S. 2 swells combining to make bigger set waves.
1 hour 39 minutes ago Katagai

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27 km away, 1 h 39 min ago

7 km/h

NNW

0.0

27.2

Air / Water (°C)

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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.

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 12 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.