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 Tuesday 16 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
17.4° C
(Which is 1.8°C colder than average for this time of year)How big are the waves at Shida today?
The current surf forecast for Shida at 3AM is: 0.4m 12s primary swell from a East-northeast direction and 0.6m 7s secondary swell from a Southwest direction (forecast issued at 08:00pm December 16). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 1.5ft (0.5m) | 12s |
| Afternoon (17 Dec) | 1.5ft (0.4m) | 11s |
| Evening (17 Dec) | 1ft (0.3m) | 11s |
Table - waves today at Shida. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | |||||||||||||||||||||
| 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) (?) | 12 | 12 | 7 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 6 | 18 | 17 | 6 | 6 | 8 | 8 | 14 | 14 | 14 | 13 | 13 | 13 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 85 | 51 | 144 | 48 | 81 | 70 | 41 | 40 | 40 | 20 | 209 | 55 | 86 | 87 | 123 | 198 | 133 | 107 | 150 | 138 | 128 | 123 | 119 | 112 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- off | on | cross- on | cross- on | cross- on | glass | cross- off | cross- off | cross- off | cross- on | on | on | cross- on | cross- on | cross- on | cross- on | cross | cross | glass | on | glass | glass | glass |
High Tide / height (m) | 3:32AM 1.23 | 1:22PM 1.37 | 4:12AM 1.30 | 2:00PM 1.39 | 4:48AM 1.34 | 2:37PM 1.42 | ||||||||||||||||||
Low Tide / height (m) | 8:14PM 0.30 | 8:04AM 1.01 | 8:51PM 0.21 | 8:51AM 1.02 | 9:27PM 0.14 | 9:31AM 1.03 | ||||||||||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 6:39 | - | - | - | - | - | - | - | 6:41 | - | - | - | - | - | - | - | 6:41 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:27 | - | - | - | - | - | - | - | 4:27 | - | - | - | - | - | - | - | 4:28 |
 | | | |  |  |  | | | |  | | | | |  | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 12 | 12 | 11 | 9 | 9 | 10 | 12 | 13 | 12 | 13 | 11 | 9 | 9 | 10 | 11 | 11 | 11 | 11 | 11 | 12 | 11 | 11 | 13 | 14 |
| Feels °C (?) | 9 | 10 | 8 | 5 | 5 | 6 | 10 | 10 | 7 | 7 | 6 | 4 | 2 | 4 | 6 | 6 | 6 | 7 | 8 | 10 | 8 | 9 | 12 | 12 |
- 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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