São Paulo weather in September
In September, São Paulo has an average high of 26 °C79 °F and an average low of 13 °C55 °F, with about 68 mm2.7 in of precipitation. It is the 8th warmest month of the year and ranks 8th for precipitation.
How September compares with other months
Compared with August, September is 1.9 °C3.5 °F warmer on average and wetter by 32 mm1.2 in. Compared with October, September is 1.6 °C2.8 °F cooler on average and drier by 37 mm1.4 in. Daylight lasts about 12.0 hours around the middle of the month. Average relative humidity is 73% and the average cloud amount 59%.
Is September a good time to visit São Paulo?
Yes — September is one of the most comfortable months to visit São Paulo by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in September
For São Paulo in September, pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| São Paulo | 2679 | 1355 | 682.7 |
| Guarulhos | 2577 | 1355 | 672.7 |
| Jundiaí | 2883 | 1356 | 592.3 |
| Atibaia | 2781 | 1355 | 622.4 |
| Santos | 2576 | 1966 | 763.0 |
| Praia Grande | 2576 | 1966 | 763.0 |
| Bragança Paulista | 2781 | 1355 | 622.4 |
| Itanhaém | 2781 | 1864 | 813.2 |
| Jacareí | 2680 | 1457 | 672.7 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Jundiaí, Santos, Praia Grande and Itanhaém.
Other months in São Paulo
- January27 °C80 °F / 18 °C65 °F
- February27 °C81 °F / 18 °C65 °F
- March26 °C79 °F / 17 °C63 °F
- April25 °C77 °F / 16 °C60 °F
- May22 °C72 °F / 12 °C54 °F
- June22 °C71 °F / 11 °C52 °F
- July22 °C71 °F / 10 °C51 °F
- August24 °C75 °F / 11 °C52 °F
- September26 °C79 °F / 13 °C55 °F
- October27 °C81 °F / 15 °C58 °F
- November27 °C80 °F / 16 °C60 °F
- December27 °C81 °F / 17 °C63 °F
Frequently asked questions
How warm is São Paulo in September?
In September the average high in São Paulo is 26 °C (79 °F) and the average low is 13 °C (55 °F).
Does it rain a lot in São Paulo in September?
On average about 68 mm (2.7 in) of precipitation falls in September; it ranks 8th of the 12 months.
Is September the warmest month in São Paulo?
No. The warmest month in São Paulo is December, with an average high of 27 °C (81 °F). The coldest month is July, with an average low of 10 °C (51 °F).
How long is the day in São Paulo in September?
In the middle of September the day in São Paulo lasts about 12.0 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is São Paulo in September?
The average relative humidity in September is about 73%. Combined with warm days, it can feel muggy.
How cloudy is São Paulo in September?
On average about 59% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.