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September Weather in Rancagua, Chile

Last updated: August 22, 2025

In Rancagua, Chile, the average temperature in September hovers around 11°C (52°F). Expect a minimum of -4°C (25°F) and a maximum of 28°C (83°F), showcasing the region’s temperature variability. Rainfall amounts to 65 mm (2.5 in) spread over 9 days, contributing to an average humidity of 62%. Pack accordingly for this diverse climate!

September Temperature in Rancagua

In September in Rancagua, the average temperature is 11°C (52°F). The maximum can reach 28°C (83°F), while the minimum can dip as low as -4°C (25°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates September temperature patterns in Rancagua, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rancagua, September typically has an average temperature of 11°C (52°F), with highs reaching up to 28°C (83°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec696864585145444751556267
Data source: Temperature data for Rancagua generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Rancagua

In Rancagua in September, the precipitation amount is 65 mm (2.5 in) over the course of 9 days.

September Precipitation Trends in Rancagua

The chart displays monthly precipitation patterns in Rancagua, 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 Rancagua, September typically receives around 65 mm (2.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1869206015083886569197
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rancagua

In Rancagua in September, humidity is 62%. With an average temperature of 11°C (52°F), this humidity feels like a cool, damp embrace that might make walking around a bit uncomfortable, but the crisp air can still be refreshing for exploring the sights if you dress warmly.

September Average Humidity in Rancagua

This chart illustrates the average monthly humidity levels in Rancagua, 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 Rancagua is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec40%41%46%54%70%78%82%79%62%64%53%39%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rancagua

In Rancagua in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Rancagua.

Maximum UV Index Levels in Rancagua for September

The chart shows the monthly maximum UV Index (UVI) for Rancagua 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 Rancagua typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141311854468111314
Data source: Rancagua 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 Rancagua Compares to Other Months

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

This table compares monthly weather conditions in Rancagua, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (69°F)18 mm (0.7 inches)40%extreme
February Weather20°C (68°F)6 mm (0.2 inches)41%extreme
March Weather18°C (64°F)9 mm (0.3 inches)46%extreme
April Weather14°C (58°F)20 mm (0.8 inches)54%very high
May Weather11°C (51°F)60 mm (2.3 inches)70%moderate
June Weather7°C (45°F)150 mm (5.9 inches)78%moderate
July Weather7°C (45°F)83 mm (3.3 inches)82%moderate
August Weather8°C (47°F)88 mm (3.5 inches)79%high
September Weather11°C (52°F)65 mm (2.5 inches)62%very high
October Weather13°C (55°F)69 mm (2.7 inches)64%extreme
November Weather17°C (62°F)19 mm (0.7 inches)53%extreme
December Weather19°C (67°F)7 mm (0.3 inches)39%extreme

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