Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Sao Joao surfForecast / Lisboa / Portugal
48hr Weather and Surf, issued 5 pm Saturday 20 Dec 2025 WETForecast update in hr min s Forecast update imminent
Sao Joao surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Sao Joao sea temperature is
15.2° C
(Which is 1.3°C colder than average for this time of year)How big are the waves at Sao Joao today?
The current surf forecast for Sao Joao at 9PM is: 4.0m 14s primary swell from a West-northwest direction (forecast issued at 05:00pm December 20). The wind direction is predicted to be onshore.
| Time (WET) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Dec) | - | - |
| Afternoon (20 Dec) | 10ft (3.0m) | 14s |
| Evening (20 Dec) | 13ft (4.0m) | 14s |
Table - waves today at Sao Joao. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||||||||
| 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 | 12 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 4054 | 4156 | 5493 | 7998 | 9009 | 10284 | 11251 | 10675 | 9939 | 9584 | 8898 | 8885 | 8793 | 8811 | 9858 | 8783 | 8018 | 6777 | 5907 | 5031 | 4391 | 4446 | 3947 | 2938 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on |
High Tide / height (m) | 2:44PM 2.44 | 2:59AM 2.66 | 3:19PM 2.44 | 3:34AM 2.67 | 3:55PM 2.41 | 4:10AM 2.66 | ||||||||||||||||||
Low Tide / height (m) | 8:42PM 0.45 | 9:11AM 0.39 | 9:16PM 0.44 | 9:47AM 0.40 | 9:51PM 0.45 | 10:24AM 0.42 | ||||||||||||||||||
Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 7:50 | - | - | - | - | - | - | - | 7:50 | - | - | - | - | - | - | - | 7:52 | - |
| Sunset | 5:17 | - | - | - | - | - | - | - | 5:17 | - | - | - | - | - | - | - | 5:19 | - | - | - | - | - | - | - |
 |  |  | |  | |  | |  | | | | |  | |  |  |  | | | | | |  | |
Rain (mm) | 2 | - | 1 | 2 | 6 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 2 | 1 | 1 | - | - | - | 1 | 1 | - | - | 1 | 8 |
| Temp. °C | 15 | 13 | 14 | 13 | 11 | 11 | 11 | 12 | 12 | 11 | 10 | 10 | 10 | 10 | 11 | 13 | 14 | 13 | 13 | 14 | 14 | 13 | 13 | 12 |
| Feels °C (?) | 11 | 9 | 9 | 6 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 7 |
- 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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