Weather in Brasilia in September 2025
- September is usually the hottest month of the year in Brasilia;
Average weather
Average temperature in Brasilia in September
The temperature in September is +31°C on average, with a range between a maximum of +35°C during the day and a minimum of +16°C at night.
The average maximum temperature goes up 11% by the end of the month, compared with the beginning of the month, from +29°C to +31°C.
Is Brasilia warm or cold in September?
Brasilia is typically warm in September.
Maximum temperatures go up compared to the previous month from +28°C to +30°C. The minimum temperature also goes up from +15°C to +18°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is the hottest month in Brasilia, here is the comparison with other months:
Climate in Brasilia in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +28°C | +30°C | +29°C | ||||
| Min. temperature | ||||||
| +8°C | +9°C | +14°C | ||||
| Max. temperature | ||||||
| +34°C | +36°C | +37°C | ||||
| Rainfall | ||||||
| 9 mm | 36 mm | 123 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 52% | 54% | 66% | ||||
| Air pressure | ||||||
| 1016 HPa | 1014 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 20 | 13 | 5 | ||||
| Cloudy days | ||||||
| 8 | 7 | 5 | ||||
| Rainy days | ||||||
| 3 | 8 | 15 | ||||
| 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 +28°C to +30°C during the day. Prepare for more rain. Average rainfall goes from 9 mm to 36 mm. Humidity rises from 52% to 54%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 20 sunny days in August to 13 in September.
October brings much the same weather, it remains good.
Wind
The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Brasilia is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Brasilia?
Climate Change over Years
The climate in Brasilia in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+26°C) and the highest in 1998 (+29°C). The driest year was 2019 with only 963 mm of rainfall, and the wettest year was 1992 with 1971 mm.
FAQ
Is September a good time to visit Brasilia?
Can you sunbathe in Brasilia in September?
Is Brasilia rainy in September?
Is it sunny in Brasilia in September?
Other cities in Brazil
Monthly weather in Brasilia
Source of the data
For this page, we’ve looked at the typical weather in Brasilia, 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.