Weather in Sao Paulo in September 2025
Average weather
Average temperature in Sao Paulo in September
Going from a maximum of +36°C during the day to a minimum of +12°C during the night, the temperature in September averages around +29°C.
The average maximum temperature goes up 8% by the end of the month, compared with the beginning of the month, from +26°C to +28°C.
Is Sao Paulo warm or cold in September?
Sao Paulo is typically warm in September.
Maximum temperatures go up compared to the previous month from +23°C to +24°C. The minimum temperature also goes up from +13°C to +15°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Sao Paulo:
Climate in Sao Paulo in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +23°C | +24°C | +25°C | ||||
| Min. temperature | ||||||
| +3°C | +6°C | +9°C | ||||
| Max. temperature | ||||||
| +34°C | +36°C | +37°C | ||||
| Rainfall | ||||||
| 50 mm | 102 mm | 134 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 72% | 75% | 77% | ||||
| Air pressure | ||||||
| 1019 HPa | 1018 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 9 | 6 | 2 | ||||
| Cloudy days | ||||||
| 10 | 7 | 6 | ||||
| Rainy days | ||||||
| 11 | 15 | 20 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting warmer as September arrives. The average maximum temperature goes up from +23°C to +24°C during the day. Prepare for more rain. Average rainfall goes from 50 mm to 102 mm. Humidity rises from 72% to 75%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 9 sunny days in August to 6 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Sao Paulo is gradually increasing during September, going from 2 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Sao Paulo?
Climate Change over Years
The climate in Sao Paulo in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+23°C) and the highest in 2001 (+27°C). The driest year was 2007 with only 1215 mm of rainfall, and the wettest year was 2022 with 2680 mm.
FAQ
Is September a good time to visit Sao Paulo?
Can you sunbathe in Sao Paulo in September?
Is Sao Paulo rainy in September?
Is it sunny in Sao Paulo in September?
Other cities in Brazil
Monthly weather in Sao Paulo
Source of the data
For this page, we’ve looked at the typical weather in Sao Paulo, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.