December weather forecast
São Paulo, Brazil

As the year concludes, December ushers in the peak of the Brazilian summer in São Paulo. The city experiences highs of 26.3°C (79.3°F) and an increase in daylight hours to 13.6, the longest throughout the year. Rainfall continues its upward trend, with the month recording an average total of 201mm (7.91") over 14 days, marking a return to early-year weather patterns. Despite the heavy showers, São Paulo remains alive with holiday cheer, ending the year on a humid, but festive note.

Temperature

São Paulo's December reports an average high-temperature of a still warm 26.3°C (79.3°F), exhibiting a minor difference from November. During December, São Paulo observes a consistent average nighttime temperature of 17.7°C (63.9°F).

Humidity

The months with the highest humidity are January, March, April and December, with an average relative humidity of 80%.

Rainfall

In São Paulo, in December, during 14 rainfall days, 201mm (7.91") of precipitation is typically accumulated. In São Paulo, Brazil, during the entire year, the rain falls for 107 days and collects up to 1441mm (56.73") of precipitation.

Daylight

With an average of 13h and 36min of daylight, December has the longest days of the year in São Paulo.
On the first day of December in São Paulo, sunrise is at 05:11 and sunset at 18:40. On the last day of the month, sunrise is at 05:22 and sunset at 18:56 -03.

Sunshine

December has the least sunshine of the year, with an average of 4.9h of sunshine.

UV index

January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index in São Paulo, Brazil. A UV Index reading of 11, and higher, represents an extreme threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 12 translates into the following recommendations:
Adopt every vital precaution, unprotected skin and eyes may burn rapidly. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.