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:
Uchiboso surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 am Wednesday 17 Dec 2025 JSTForecast update in hr min s Forecast update imminent
Uchiboso surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Uchiboso sea temperature is
19.2° C
(Which is normal for this time of year)How big are the waves at Uchiboso today?
The current surf forecast for Uchiboso at 10AM is: 0.6m 6s primary swell from a Southwest direction and 0.1m 8s secondary swell from a Southeast direction (forecast issued at 08:00am December 17). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 2ft (0.6m) | 6s |
| Afternoon (17 Dec) | 4ft (1.2m) | 6s |
| Evening (17 Dec) | 5ft (1.5m) | 6s |
Table - waves today at Uchiboso. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 17 | Thursday 18 | Friday 19 | Sat 20 | |||||||||||||||||||||
| 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) (?) | 7 | 6 | 6 | 6 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 10 | 11 | 11 | 5 | 4 | 4 | 5 | 5 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 158 | 34 | 60 | 103 | 76 | 138 | 105 | 52 | 37 | 32 | 26 | 19 | 10 | 11 | 7 | 4 | 4 | 4 | 5 | 5 | 5 | 13 | 25 | 43 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- off | cross- on | cross- on | on | on | cross | cross- off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | glass | glass | on | cross- on | cross- on |
High Tide / height (m) | 3:32AM 1.39 | 2:02PM 1.48 | 4:21AM 1.47 | 2:40PM 1.52 | 5:05AM 1.52 | 3:18PM 1.56 | ||||||||||||||||||
Low Tide / height (m) | 8:37AM 0.98 | 9:13PM 0.18 | 9:25AM 1.01 | 9:53PM 0.08 | 10:08AM 1.03 | 10:33PM 0.01 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Sat 20 | |||||||||||||||||||||
| Sunrise | - | 6:41 | - | - | - | - | - | - | - | 6:41 | - | - | - | - | - | - | - | 6:43 | - | - | - | - | - | - |
| Sunset | - | - | - | 4:30 | - | - | - | - | - | - | - | 4:30 | - | - | - | - | - | - | - | 4:30 | - | - | - | - |
 |  |  | |  | | | | | | | | | | |  | | |  | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - |
| Temp. °C | 10 | 10 | 11 | 13 | 14 | 15 | 14 | 11 | 9 | 9 | 11 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Feels °C (?) | 5 | 6 | 8 | 8 | 6 | 8 | 9 | 3 | 2 | 3 | 6 | 7 | 8 | 9 | 10 | 10 | 8 | 8 | 10 | 12 | 14 | 13 | 11 | 10 |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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