September weather forecast
São Paulo, Brazil

September introduces São Paulo to the onset of Spring, with rising temperatures and increased precipitation. Rainfall increases substantially from August’s low, averaging 71mm (2.8") over seven days, signaling the gradual shift back towards wetter weather. With temperature highs of 23.9°C (75°F), days start to feel warmer, and daylight hours increase to 12. As the city awakes from the winter, its foliage bursts into bloom.

Temperature

São Paulo's weather in September indicates an average high-temperature of a still moderately hot 23.9°C (75°F), nearly consistent with the 23.3°C (73.9°F) of August. Throughout September, the temperature in São Paulo tends to fall to a consistent average low of 13.9°C (57°F).

Humidity

In São Paulo, the average relative humidity in September is 77%.

Rainfall

In São Paulo, Brazil, during September, the rain falls for 7 days and regularly aggregates up to 71mm (2.8") of precipitation. Throughout the year, in São Paulo, Brazil, there are 107 rainfall days, and 1441mm (56.73") of precipitation is accumulated.

Daylight

In São Paulo, the average length of the day in September is 11h and 58min.
On the first day of September, sunrise is at 06:16 and sunset at 17:56. On the last day of the month, sunrise is at 05:47 and sunset at 18:05 -03.

Sunshine

The average sunshine in September in São Paulo, Brazil, is 5.1h.

UV index

The average daily maximum UV index in September in São Paulo is 9. A UV Index of 8 to 10 symbolizes a very high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high UV index of 9 in September translates into the following recommendations:
Prioritize your safety. Without precautions, skin and eyes might get hurt quickly. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.