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 Monday 15 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
17.8° C
(Which is 1.6°C colder than average for this time of year)How big are the waves at Shida today?
The current surf forecast for Shida at 8PM is: 0.7m 9s primary swell from a South-southeast direction and 0.3m 9s secondary swell from a Southwest direction, 0.4m 4s secondary swell from a North direction (forecast issued at 02:00pm December 15). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Dec) | - | - |
| Afternoon (15 Dec) | 2.5ft (0.7m) | 9s |
| Evening (15 Dec) | 2.5ft (0.7m) | 8s |
Table - waves today at Shida. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | |||||||||||||||||||||
| 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) (?) | 10 | 9 | 9 | 8 | 8 | 8 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 18 | 18 | 17 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 98 | 84 | 67 | 64 | 48 | 47 | 69 | 88 | 52 | 55 | 50 | 51 | 49 | 48 | 72 | 70 | 41 | 61 | 39 | 38 | 55 | 55 | 86 | 87 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | on | on | on | on | on | on | on | on | on | cross- on | glass | on | cross- on | cross- on | on | glass | glass | glass | cross- on | on | on | cross- on | cross- on |
High Tide / height (m) | 2:44AM 1.15 | 12:44PM 1.34 | 3:32AM 1.23 | 1:22PM 1.37 | 4:12AM 1.30 | |||||||||||||||||||
Low Tide / height (m) | 7:35PM 0.42 | 7:07AM 0.97 | 8:14PM 0.30 | 8:04AM 1.01 | 8:51PM 0.21 | 8:51AM 1.02 | ||||||||||||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | - | 6:39 | - | - | - | - | - | - | - | 6:39 | - | - | - | - | - | - | - | 6:41 |
| Sunset | - | 4:25 | - | - | - | - | - | - | - | 4:27 | - | - | - | - | - | - | - | 4:27 | - | - | - | - | - | - |
 | |  | |  |  | |  | | | | | | | | | | | | | | |  |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 |
| Temp. °C | 12 | 12 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 11 | 12 | 11 | 11 | 11 | 11 | 11 | 10 |
| Feels °C (?) | 4 | 5 | 4 | 5 | 5 | 4 | 4 | 4 | 5 | 7 | 7 | 8 | 7 | 5 | 6 | 6 | 9 | 10 | 9 | 8 | 7 | 7 | 6 | 4 |
- 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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