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Brasília sits at high altitude in or near the tropics, giving it a remarkably stable, spring-like climate regardless of season. While cities at sea level in the same latitude region experience intense heat and humidity, the elevation creates a natural thermal buffer: daytime temperatures typically range from 18–24°C year-round, nights cool to 10–16°C, and relative humidity is moderate at 55–75%. This makes Brasília one of the most straightforward cities in the world for natural ventilation — there is no high-summer emergency to manage and no need to seal windows against oppressive heat.
The main ventilation rhythm follows the daily temperature cycle: open mid-morning as outdoor air warms to comfortable levels, reduce in the afternoon if cooling rain arrives (common in equatorial highland climates), and ventilate again in the evening before night cooling begins. Air quality is the primary variable to monitor: many high-altitude cities sit in valleys or basins where thermal inversions trap vehicle and industrial emissions on cold, calm mornings. Seasonal agricultural burning can create significant smoke events. OpenWindow.live provides real-time AQI data to guide ventilation on days when pollution — not temperature — is the deciding factor in Brasília.
À Brasília, les meilleurs moments pour aérer sont généralement tôt le matin (5–8h) et le soir tard, quand la température extérieure passe sous celle de l'intérieur.
Oui, dans la plupart des cas. Ouvrir les fenêtres peut faire baisser la température intérieure de 2–5°C en 30 minutes si l'air extérieur est plus frais.
Au-dessus de 80%, ouvrir les fenêtres rend l'air collant. Mieux vaut attendre des heures plus sèches.