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:
Arniston surfForecast / Overberg / South Africa
48hr Weather and Surf, issued 1 am Thursday 11 Dec 2025 SASTForecast update in hr min s Forecast update imminent
Arniston surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Arniston sea temperature is
20.8° C
(Which is 1.4°C warmer than normal for this time of year)How big are the waves at Arniston today?
The current surf forecast for Arniston at 7AM is: 1.6m 7s primary swell from a East direction and 0.7m 11s secondary swell from a South-southwest direction (forecast issued at 01:00am December 11). The wind direction is predicted to be cross-onshore.
| Time (SAST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 5ft (1.5m) | 7s |
| Afternoon (11 Dec) | 4.5ft (1.3m) | 7s |
| Evening (11 Dec) | 2.5ft (0.8m) | 9s |
Table - waves today at Arniston. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 9 | 9 | 8 | 19 | 18 | 17 | 17 | 10 | 10 | 10 | 15 | 14 | 14 | 14 | 13 | 13 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 219 | 278 | 295 | 264 | 214 | 186 | 160 | 135 | 112 | 118 | 145 | 214 | 309 | 2374 | 535 | 886 | 910 | 2483 | 5571 | 3338 | 2441 | 2113 | 1749 | 1532 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- off | cross- off | cross- off | off | cross- off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 8:09AM 1.49 | 8:37PM 1.24 | 9:19AM 1.44 | 10:02PM 1.19 | 10:31AM 1.42 | |||||||||||||||||||
Low Tide / height (m) | 1:36AM 0.54 | 2:45PM 0.64 | 2:40AM 0.64 | 4:06PM 0.66 | 3:57AM 0.70 | 5:20PM 0.63 | ||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| Sunrise | - | - | - | 5:18 | - | - | - | - | - | - | - | 5:18 | - | - | - | - | - | - | - | 5:18 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 7:45 | - | - | - | - | - | - | - | 7:45 | - | - | - | - | - | - | - | 7:45 | - |
 |  | |  | | | |  | | | | | |  |  | |  |  | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | - | - | - | - | - | - |
| Temp. °C | 18 | 18 | 18 | 19 | 22 | 23 | 23 | 20 | 20 | 20 | 19 | 22 | 26 | 21 | 18 | 19 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 |
| Feels °C (?) | 12 | 12 | 14 | 16 | 21 | 21 | 22 | 17 | 18 | 18 | 15 | 17 | 17 | 12 | 11 | 11 | 10 | 9 | 10 | 10 | 10 | 11 | 11 | 13 |
- 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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