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Surf Forecasts:
Katagai surfForecast / Chiba / Japan
12 Day Weather and Surf, issued 8 am Monday 09 Mar 2026 JSTForecast 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
13.5° C
(Which is 2.7°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 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Mar 11) at 3AM. The primary swell is predicted to be 1.6m and 8s period with a secondary swell of 1.3m and 8s. Another secondary swell of 0.1m and 9s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Katagai in the next 12 days are 5.0m 12s and forecast to arrive on Sunday (Mar 15) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Wednesday (Mar 11) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Wed 11th Mar) | 5ft (1.6m) 8s |
| Best Surf | 9AM (Thu 12th Mar) | 4.5ft (1.3m) 14s |
| Most Powerful | 6AM (Sun 15th Mar) | 16ft (5.0m) 12s |
Table - best surf conditions forecast for Katagai over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Light rain (total 7mm), mostly falling on Mon night. Mild temperatures (max 9°C on Mon morning, min 3°C on Tue morning). Winds decreasing (fresh winds from the NNE on Tue night, light winds from the E by Wed morning). | Days 3-6 Weather Summary Some drizzle, heaviest during Thu night. Mild temperatures (max 9°C on Fri night, min 6°C on Thu night). Winds increasing (light winds from the NNE on Thu morning, strong winds from the NNE by Sat morning). | ||||||||||||||||||||
Monday 09 | Tuesday 10 | Wednesday 11 | Thursday 12 | Friday 13 | Saturday 14 | Sunday 15 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 12 | 11 | 11 | 11 | 6 | 8 | 10 | 11 | 14 | 14 | 14 | 14 | 15 | 17 | 17 | 17 | 17 | 11 | 15 | 15 | 15 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 172 | 125 | 87 | 86 | 97 | 251 | 186 | 287 | 447 | 665 | 843 | 931 | 1005 | 1729 | 1837 | 1610 | 1449 | 3491 | 6238 | 6144 | 5313 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross | cross | cross- off | cross- off | cross- off | cross- off | cross- on | cross | cross- off | cross | cross | cross- off | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 8:01PM 1.09 | 6:40AM 1.37 | 9:12PM 0.99 | 6:58AM 1.33 | 7:16AM 1.27 | 7:23AM 1.20 | 3:53AM 11:12AM 1.18 1.13 | 3:38AM 1.22 | 1:12PM 1.18 | ||||||||||||
Low Tide / height (m) | 1:27PM 0.36 | 12:37AM 0.86 | 2:11PM 0.42 | 12:29AM 0.94 | 3:13PM 0.48 | 4:53PM 0.52 | 6:45PM 0.47 | 8:32AM 1.11 | 7:51PM 0.38 | 8:39AM 1.01 | 8:35PM 0.31 | ||||||||||
Monday 09 | Tuesday 10 | Wednesday 11 | Thursday 12 | Friday 13 | Saturday 14 | Sunday 15 | |||||||||||||||
| Sunrise | 5:58 | - | - | 5:56 | - | - | 5:54 | - | - | 5:54 | - | - | 5:52 | - | - | 5:50 | - | - | 5:50 | - | - |
| Sunset | - | 5:38 | - | - | 5:39 | - | - | 5:40 | - | - | 5:42 | - | - | 5:43 | - | - | 5:43 | - | - | 5:44 | - |
 |  |  |  |  |  | | |  | | | | | | | |  | | | | | |
Rain (mm) | - | - | 3 | 3 | 1 | - | - | - | - | - | - | 1 | - | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 8 | 8 | 4 | 8 | 7 | 8 | 8 | 8 | 7 | 8 | 7 | 8 | 8 | 9 | 9 | 9 | 8 | 10 | 11 | 10 |
| Feels °C (?) | 5 | 2 | 3 | -3 | 1 | -2 | 4 | 3 | 3 | 2 | 3 | 1 | 0 | 0 | 0 | -1 | -1 | -2 | 1 | 3 | 4 |
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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 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.
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