Santiago Climate Trends
Chile · South America · 50 years of climate trend data
This page tracks how Santiago's climate has shifted over 50 years of daily measurements, warmer summers, milder winters, and changes in rainfall, rather than current conditions. The two clearest signs of change: extremely hot days have grown by 7.8 a year and frost days have grown by 6 a year, from 23 to 29 days below 0°C. Measurement period: the last 50 years (1976-2025).
Data through September 12, 2026.
Frequently asked questions about Santiago's climate
How much warmer have summers in Santiago become?
The average daytime high across June, July and August fell by 0°C between 1976-1980 and 2021-2025. That is a five-year average at each end rather than two isolated summers, so a single exceptional heatwave or cool summer does not drive the number.
Have winters in Santiago become milder?
The average daytime high across December, January and February rose by 0.5°C between 1976-1980 and 2021-2025. In many capitals in this dataset winter is changing faster than summer, which shows up most clearly in the frost-day count below.
How many days above 30°C does Santiago get a year?
Santiago averaged 13 days a year above 30°C in 2021-2025, up from 5 in 1976-1980. These are the days that set peak cooling demand and the days hospitals see heat complaints rise.
How many frost days does Santiago still get?
Santiago averaged 29 frost days a year in 2021-2025, up from 23 in 1976-1980. The frost count actually grew here, which is rare in this dataset.
Is spring arriving earlier in Santiago?
Spring now starts about 0.1 weeks earlier than in 1976-1980. The start point is the first day the trailing seven-day average high crosses 12°C, a fixed in-house measure used only to compare Santiago against itself rather than against other cities.
Has the growing season in Santiago grown longer?
The growing season is about 5 days longer between 1976-1980 and 2021-2025. That is the stretch between the start of spring and the first autumn night below freezing, which is exactly the window gardens, farming and pollen seasons run inside.
Is rainfall in Santiago getting heavier?
Santiago averaged 6.2 days a year with more than 20mm of rain in 2021-2025, down from 9.4 in 1976-1980. This capital gets fewer heavy rain days now, which brings its own problems in a drying climate.
