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 pm Saturday 13 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
17.7° C
(Which is 1.7°C colder than average for this time of year)How big are the waves at Shida today?
The current surf forecast for Shida at 12AM is: 0.5m 11s primary swell from a East direction and 0.4m 11s secondary swell from a Northeast direction (forecast issued at 08:00pm December 13). An open ocean swell of 1.2m 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 (14 Dec) | - | - |
| Afternoon (14 Dec) | - | - |
| Evening (14 Dec) | 2ft (0.6m) | 11s |
Table - waves today at Shida. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sat 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| 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 | 6 AM | 9 AM | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 11 | 6 | 7 | 7 | 10 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 12 | 12 | 12 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 115 | 102 | 64 | 268 | 227 | 289 | 1540 | 2719 | 3110 | 2291 | 1184 | 466 | 292 | 181 | 128 | 108 | 84 | 65 | 64 | 49 | 98 | 57 | 93 | 109 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross | cross- off | cross- on | cross- on | on | cross- on | cross | cross | cross- on | cross | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | on | on | on | on | cross- on |
High Tide / height (m) | 11:49PM 1.00 | 11:30AM 1.31 | 1:34AM 1.06 | 12:07PM 1.33 | 2:44AM 1.15 | 12:44PM 1.34 | ||||||||||||||||||
Low Tide / height (m) | 5:55PM 0.68 | 4:48AM 0.80 | 6:51PM 0.54 | 5:59AM 0.90 | 7:35PM 0.42 | 7:07AM 0.97 | ||||||||||||||||||
Sat 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:39 | - | - | - | - | - | - | - | 6:39 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:25 | - | - | - | - | - | - | - | 4:25 | - | - | - | - | - | - | - | 4:27 |
 |  | | | |  | |  |  | |  | | |  | | | | | | | |  | | | |
Rain (mm) | - | 1 | 4 | 4 | 2 | 6 | 6 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 11 | 12 | 9 | 7 | 8 | 9 | 10 | 12 | 10 | 11 | 9 | 9 | 10 | 11 | 12 | 10 | 9 | 9 | 9 | 8 | 9 | 10 | 11 |
| Feels °C (?) | 5 | 8 | 9 | 5 | 3 | 5 | 4 | 7 | 8 | 8 | 7 | 4 | 2 | 2 | 4 | 5 | 3 | 3 | 4 | 4 | 3 | 4 | 5 | 8 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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