September Weather in Santiago, Paraguay

Last updated: August 31, 2025

In Santiago, Paraguay, the average temperature in September is a comfortable 21°C (69°F). Expect a minimum of 8°C (47°F) and occasional highs of up to 37°C (99°F). During this month, there's typically 91 mm (3.6 in) of precipitation across 9 days, contributing to an average humidity of 54%. Enjoy the diverse weather while exploring this vibrant destination!

September Temperature in Santiago

In September in Santiago, the average temperature is 21°C (69°F). Maximums can reach 37°C (99°F), and minimums can drop as low as 8°C (47°F). It's advisable to pack layers and stay hydrated while exploring the diverse weather conditions during your travels.

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 (69°F), with highs reaching up to 37°C (99°F) and lows dropping to around 8°C (47°F).

Data source: Temperature data for Santiago generated using information from the Copernicus Climate Change Service.

September Precipitation in Santiago

In Santiago in September, the precipitation amount is 91 mm (3.6 in) spread over 9 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 91 mm (3.6 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Santiago

In Santiago in September humidity is 54%. With average temperature 21°C (69°F), this humidity feels like a refreshing embrace, making outdoor adventures enjoyable but occasionally prompting a need for a light breeze or shade while exploring.

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 54%, offering insight into how humid the weather typically is during this month.

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 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	28°C (82°F)	153 mm (6.0 inches)	77%	extreme
February Weather	27°C (80°F)	89 mm (3.5 inches)	71%	extreme
March Weather	25°C (78°F)	120 mm (4.7 inches)	74%	extreme
April Weather	22°C (73°F)	137 mm (5.4 inches)	82%	very high
May Weather	19°C (66°F)	208 mm (8.2 inches)	82%	high
June Weather	17°C (63°F)	98 mm (3.9 inches)	73%	moderate
July Weather	16°C (61°F)	74 mm (2.9 inches)	67%	high
August Weather	18°C (65°F)	68 mm (2.7 inches)	49%	high
September Weather	21°C (69°F)	91 mm (3.6 inches)	54%	very high
October Weather	23°C (74°F)	165 mm (6.5 inches)	58%	extreme
November Weather	25°C (77°F)	145 mm (5.7 inches)	69%	extreme
December Weather	27°C (80°F)	86 mm (3.4 inches)	84%	extreme