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Heatwaves in Adelaide, very hot days and nights that often fall

Adelaide days can be extreme. Dry air often lets the night recover. Shade hard by day, then flush only when outdoor air is cooler than the room.

Adelaide’s reputation is the daytime extreme: long, hot, dry summer days on the plains. On the Bureau of Meteorology’s long-term city table, the November minimum is about 14.0 °C and the January minimum about 17.1 °C. The night often recovers, because the air is dry and the sky is clear. That recovery is the ventilation opportunity. It is not guaranteed on the worst heatwave nights, when the minimum stays in the 20s and the house is still unloading the afternoon.

The plains and the dense inner suburbs hold more of the day than the hills. A cool change from the south can end a hot spell quickly. Until it does, a west-facing room can be far hotter than the airport number. That difference is an urban heat island plus a simple matter of which way the glass faces.

Dry heat rewards a real gap

  • Shade through the long afternoon. Dry heat does not mean the sun is gentle. See protect your windows
  • When shaded outdoor air drops below indoor air, a wider night flush works better here than in a humid city at the same temperature. Dry air carries heat out without loading the room with water
  • Brick and a hot roof release heat slowly. Give the flush time. See top-floor heat
  • If the minimum stays as warm as the room, close and aim a fan at people. See where to place a fan
  • Pollen maps in Ventilate cover Europe (CAMS). An empty pollen row in Adelaide does not close the windows
  • Compare indoor and outdoor air before you turn on the air conditioning

Practical Adelaide night

  • Do not open during the peak just because the evening looks calmer. Wait until outdoor air is cooler than indoors
  • A November minimum near 14 °C is still a cooling night for a hot house
  • On a multi-day heatwave, the second night is harder because the building never unloaded
  • Prefer the cooler or more open side as intake if you have two façades

Tonight follows your indoor thermometer, not the day’s maximum.

Trees, shade, and less bare paving set how long the plains stay hot after sunset: heatwaves and public choices.

Updated

Sources and further reading

Official guidance supporting the practical advice on this page.

Links checked 29 August 2026.

More in this guide

Heatwaves in Paris, and the night the street stays warm

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Madrid days run very hot and dry. The heat island still matters at night, when asphalt gives the sun back. Shade hard by day, then flush only when the street has actually cooled.

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São Paulo summers are humid, high-rises hold heat, and tropical nights often refuse to dry out. Traffic pollution and storms change when a night flush is actually worth it.

Heatwaves in Buenos Aires, humid summers on the river

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Sydney's heat season is December to February. The coast can breathe while western suburbs hold the day. Open when the air at your window is actually cooler.

Heatwaves in Rotterdam, wind, towers, and hot dockside air

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Heatwaves in Melbourne, and the night of the cool change

Melbourne heat often arrives on a northerly and breaks with a cool change. Many nights still drop. Open when outdoor air is cooler than the room.

Heatwaves in Brisbane, humid nights that linger

Brisbane summers are humid, and January nights often stay near 21 °C. Storms interrupt the flush. Open when outdoor air is cooler, and watch the dew point.

Heatwaves in Perth, dry days and the afternoon sea breeze

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Heatwaves in cities, and why nights stay hot · All guides

These guides are informational and are not medical advice. If heat is making you unwell, follow your local health agency’s guidance.