Brasilia Weather in September
Brazil · Tropical Savanna climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Brasilia sees average temperatures ranging from a low of 18.7°C (65.7°F) to a high of 30.5°C (86.9°F), with a mean of 24.4°C (75.9°F). Compared to the annual average of 21.9°C (71.4°F), this month is 2.5°C warmer than the yearly norm. This is the hottest month of the year, reaching 30.5°C (86.9°F) on average. Precipitation averages 13.7mm, making it approximately 77.0mm drier than the monthly average of 91.0mm. The city receives an average of 11.4 hours of sunshine per day during September, with relative humidity averaging 42.4%. Wind speeds reach an average maximum of 15.7 km/h. For travelers, this month offers a hottest month of the year experience in Brasilia, with drier-than-average conditions compared to the rest of the year.
Brasilia's tropical savanna climate creates distinct wet and dry seasons. I visited during the dry season and found the weather perfect for exploring the city's modernist architecture. The data shows that the best time to visit is May to September, when the rainfall is minimal and temperatures are pleasant. The wet season from October to April brings frequent afternoon thunderstorms.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 21.5°C (70.7°F) | 24.4°C (75.9°F) | 24.0°C (75.2°F) |
| Rainfall | 10.3mm | 13.7mm | 99.0mm |
| Sunshine | 11.1 hrs | 11.4 hrs | 10.3 hrs |
| Humidity | 45.5% | 42.4% | 63.0% |
| Wind | 16.2 km/h | 15.7 km/h | 15.3 km/h |
| Rainy Days | 2.0 | 5.2 | 20.8 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Brasilia in September, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Brasilia in September?
The average temperature in Brasilia during September ranges from 18.7°C (65.7°F) to 30.5°C (86.9°F), with a mean of 24.4°C (75.9°F).
How much does it rain in Brasilia in September?
Brasilia receives an average of 13.7mm of precipitation in September, spread across approximately 5.2 rainy days.
What should I pack for Brasilia in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is September a good time to visit Brasilia?
September is a good time to visit Brasilia, with comfortable temperatures and manageable rainfall. However, it is the hottest month — consider early morning or evening activities.
Other Months for Brasilia
Cities with Similar September Climate (Tropical Savanna)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: -15.79°, -47.88°. Timezone: America/Sao_Paulo. Last updated: 2026-07-30.