nomadseason

September Weather in Santiago, Colombia

Last updated: August 23, 2025

In September, the average temperature in Santiago, Colombia hovers around 21°C (70°F). Expect a comfortable climate, with minimum temperatures dipping to 14°C (58°F) and reaching a maximum of 31°C (87°F). Be prepared for some rain, as there's an average precipitation of 57 mm (2.3 in) spread over 10 days, and enjoy the lush atmosphere with an average humidity of 78%.

September Temperature in Santiago

In September in Santiago, the average temperature is 21°C (70°F), with maximums reaching 31°C (87°F) and minimums dropping as low as 14°C (58°F). This pleasant climate makes Santiago an ideal destination for travelers seeking comfortable weather conditions.

September Weather in Santiago: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santiago, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santiago, September typically has an average temperature of 21°C (70°F), with highs reaching up to 31°C (87°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec666666686969707070686767
Data source: Temperature data for Santiago generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Santiago

In Santiago in September, the precipitation amount is 57 mm (2.3 in) over the course of 10 days.

September Precipitation Trends in Santiago

The chart displays monthly precipitation patterns in Santiago, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Santiago, September typically receives around 57 mm (2.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec43741121171006223295711810129
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Santiago

In Santiago in September, humidity is 78%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can leave travelers feeling sticky and slightly fatigued, making it important to stay hydrated and take frequent breaks from outdoor activities.

September Average Humidity in Santiago

This chart illustrates the average monthly humidity levels in Santiago, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Santiago is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec52%47%45%54%81%88%88%82%78%83%84%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santiago

In Santiago in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Santiago.

Maximum UV Index Levels in Santiago for September

The chart shows the monthly maximum UV Index (UVI) for Santiago in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Santiago typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141516171615141515151312
Data source: Santiago September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Santiago Compares to Other Months

Weather in Santiago varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Santiago, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Santiago, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather19°C (67°F)43 mm (1.7 inches)52%extreme
February Weather19°C (67°F)74 mm (2.9 inches)47%extreme
March Weather19°C (67°F)112 mm (4.4 inches)45%extreme
April Weather20°C (68°F)117 mm (4.6 inches)54%extreme
May Weather20°C (69°F)100 mm (3.9 inches)81%extreme
June Weather20°C (69°F)62 mm (2.5 inches)88%extreme
July Weather21°C (70°F)23 mm (0.9 inches)88%extreme
August Weather21°C (70°F)28 mm (1.1 inches)82%extreme
September Weather21°C (70°F)57 mm (2.3 inches)78%extreme
October Weather20°C (69°F)118 mm (4.6 inches)83%extreme
November Weather20°C (68°F)101 mm (4.0 inches)83%extreme
December Weather20°C (68°F)29 mm (1.1 inches)70%extreme

Compare Santiago's Climate with Cities Worldwide