Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
70-foot plus waves predicted for Portuguese big wave tow surfing competition.
Surf Forecasts:
Shida surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 am Thursday 11 Dec 2025 JSTForecast update in hr min s Forecast update imminent
Shida surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Shida sea temperature is
18.5° C
(Which is 1.1°C colder than average for this time of year)How big are the waves at Shida today?
The current surf forecast for Shida at 1PM is: 0.7m 9s primary swell from a East-southeast direction and 0.4m 4s secondary swell from a East-southeast direction (forecast issued at 08:00am December 11). An open ocean swell of 0.5m 5s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 2.5ft (0.8m) | 10s |
| Afternoon (11 Dec) | 2ft (0.6m) | 9s |
| Evening (11 Dec) | 6ft (1.9m) | 6s |
Table - waves today at Shida. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 11 | Friday 12 | Saturday 13 | Sun 14 | |||||||||||||||||||||
| 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 9 | 9 | 11 | 6 | 7 | 7 | 8 | 10 | 8 | 5 | 13 | 12 | 9 | 9 | 10 | 14 | 12 | 12 | 12 | 12 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 63 | 103 | 78 | 59 | 49 | 269 | 357 | 199 | 76 | 62 | 53 | 117 | 93 | 113 | 122 | 101 | 113 | 68 | 104 | 109 | 109 | 98 | 119 | 96 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- off | cross- off | cross- off | cross- off | cross- off | on | on | on | on | on | on | on | on | on | on | on | on | cross- on | cross | cross | cross- off | cross- on |
High Tide / height (m) | 9:33AM 1.29 | 8:01PM 1.14 | 10:13AM 1.29 | 9:42PM 1.03 | 10:52AM 1.30 | 11:49PM 1.00 | ||||||||||||||||||
Low Tide / height (m) | 3:14PM 0.92 | 2:57AM 0.51 | 4:41PM 0.82 | 3:48AM 0.67 | 5:55PM 0.68 | |||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | Sun 14 | |||||||||||||||||||||
| Sunrise | - | 6:35 | - | - | - | - | - | - | - | 6:35 | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - |
| Sunset | - | - | - | 4:25 | - | - | - | - | - | - | - | 4:25 | - | - | - | - | - | - | - | 4:25 | - | - | - | - |
 |  | |  |  | | | | |  | | | | | | | | | | | |  |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 6 | 6 |
| Temp. °C | 10 | 10 | 14 | 15 | 15 | 16 | 16 | 10 | 9 | 7 | 7 | 7 | 6 | 5 | 4 | 5 | 5 | 5 | 6 | 6 | 8 | 10 | 10 | 7 |
| Feels °C (?) | 6 | 7 | 10 | 7 | 6 | 6 | 7 | 2 | 2 | -3 | -4 | -3 | -2 | -2 | -2 | 0 | 0 | 0 | 2 | 1 | 3 | 6 | 8 | 1 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
Buy Less, Surf More This Black Friday
Surf-forecast is providing a free, all-access pass to our premium features and 12-day forecasts all weekend.
Quiksilver Teams Up With PrimaLoft® For World’s First Thermal Layering System for a Wetsuit.
Previously used in our snow jackets for mountain conditions, PrimaLoft® technology is making its debut in the surf industry. The aim is to bring mountain-grade warmth to the waves.
Vancouver Island’s Day Of Days With Reed Platenius
Surf-Forecast recently helped the 21-year-old Canadian pro surfer and adventurer score some cold water perfection at home.
Read more
Discover more articles and updates in the Greenroom.
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 Shida 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.
Nearest