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 2 pm Friday 12 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
18.8° C
(Which is slightly cooler than normal)How big are the waves at Shida today?
The current surf forecast for Shida at 4PM is: 0.4m 10s primary swell from a East-southeast direction and 0.3m 7s secondary swell from a Southwest direction (forecast issued at 02:00pm December 12). An open ocean swell of 1.2m 9s is not directed at the surf break. The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Dec) | - | - |
| Afternoon (12 Dec) | 1.5ft (0.4m) | 10s |
| Evening (12 Dec) | 3ft (0.9m) | 9s |
Table - waves today at Shida. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | |||||||||||||||||||||
| 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 | 6 AM | 9 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 10 | 13 | 9 | 9 | 9 | 9 | 9 | 11 | 12 | 12 | 11 | 11 | 6 | 6 | 7 | 9 | 10 | 10 | 11 | 11 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 91 | 42 | 129 | 132 | 163 | 135 | 95 | 88 | 100 | 109 | 107 | 102 | 64 | 102 | 95 | 131 | 1015 | 1539 | 1734 | 2310 | 2032 | 1124 | 392 | 292 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | on | on | on | on | on | on | cross- on | cross- on | cross | cross- off | cross | cross- on | cross- on | on | cross- on | cross- on | cross | cross | cross- off | cross | cross- on | cross- on |
High Tide / height (m) | 9:42PM 1.03 | 10:52AM 1.30 | 11:49PM 1.00 | 11:30AM 1.31 | 1:34AM 1.06 | |||||||||||||||||||
Low Tide / height (m) | 4:41PM 0.82 | 3:48AM 0.67 | 5:55PM 0.68 | 4:48AM 0.80 | 6:51PM 0.54 | 5:59AM 0.90 | ||||||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:39 |
| Sunset | - | 4:25 | - | - | - | - | - | - | - | 4:25 | - | - | - | - | - | - | - | 4:25 | - | - | - | - | - | - |
 | |  |  | | | | | | | |  | | | |  |  | |  | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | 1 | 3 | 1 | 1 | 9 | 1 | 1 | - | - | - | - | - | - |
| Temp. °C | 9 | 9 | 8 | 5 | 4 | 4 | 5 | 5 | 6 | 7 | 9 | 10 | 10 | 6 | 6 | 7 | 8 | 8 | 10 | 9 | 10 | 10 | 9 | 10 |
| Feels °C (?) | 0 | 1 | 1 | -2 | -2 | -2 | -1 | 0 | 2 | 3 | 4 | 7 | 7 | 0 | 2 | 3 | 4 | 4 | 6 | 5 | 4 | 4 | 2 | 2 |
- 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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