September Weather in Santa Catalina de Siena, Mexico

Last updated: August 27, 2025

In September, the average temperature in Santa Catalina de Siena, Mexico is a pleasant 19°C (66°F). Expect a comfortable range, with a minimum of 9°C (49°F) and a maximum of 29°C (84°F). However, be prepared for some rain, as the region experiences about 189 mm (7.4 in) of precipitation over 20 days. With an average humidity of 82%, it's a perfect time to embrace the gentle climate!

September Temperature in Santa Catalina de Siena

In September in Santa Catalina de Siena, the average temperature is 19°C (66°F). The maximum can reach 29°C (84°F) and the minimum can be as low as 9°C (49°F). This pleasant climate makes Santa Catalina de Siena an ideal destination for travelers seeking enjoyable weather during their visit.

September Weather in Santa Catalina de Siena: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santa Catalina de Siena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Catalina de Siena, September typically has an average temperature of 19°C (66°F), with highs reaching up to 29°C (84°F) and lows dropping to around 9°C (49°F).

Data source: Temperature data for Santa Catalina de Siena generated using information from the Copernicus Climate Change Service.

September Precipitation in Santa Catalina de Siena

In Santa Catalina de Siena in September, the precipitation amount is 189 mm (7.4 in) over the course of 20 days.

September Precipitation Trends in Santa Catalina de Siena

The chart displays monthly precipitation patterns in Santa Catalina de Siena, 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 Santa Catalina de Siena, September typically receives around 189 mm (7.4 inches) of precipitation spread over approximately 20 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Santa Catalina de Siena

In Santa Catalina de Siena in September humidity is 82%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket wrapping around you, making it slightly uncomfortable for traveling as you might find yourself constantly seeking shade or a cool breeze.

September Average Humidity in Santa Catalina de Siena

This chart illustrates the average monthly humidity levels in Santa Catalina de Siena, 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 Santa Catalina de Siena is approximately 82%, 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 Santa Catalina de Siena

In Santa Catalina de Siena in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Santa Catalina de Siena.

Maximum UV Index Levels in Santa Catalina de Siena for September

The chart shows the monthly maximum UV Index (UVI) for Santa Catalina de Siena 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 Santa Catalina de Siena typically reaches 13, which falls under the extreme exposure category.

Data source: Santa Catalina de Siena 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 Santa Catalina de Siena Compares to Other Months

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

This table compares monthly weather conditions in Santa Catalina de Siena, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (53°F)	10 mm (0.4 inches)	70%	very high
February Weather	14°C (58°F)	11 mm (0.4 inches)	62%	extreme
March Weather	17°C (64°F)	11 mm (0.4 inches)	53%	extreme
April Weather	20°C (68°F)	5 mm (0.2 inches)	48%	extreme
May Weather	23°C (73°F)	14 mm (0.5 inches)	52%	extreme
June Weather	23°C (74°F)	65 mm (2.5 inches)	64%	extreme
July Weather	21°C (70°F)	198 mm (7.8 inches)	73%	extreme
August Weather	21°C (70°F)	112 mm (4.4 inches)	71%	extreme
September Weather	19°C (66°F)	189 mm (7.4 inches)	82%	extreme
October Weather	18°C (64°F)	61 mm (2.4 inches)	83%	extreme
November Weather	15°C (59°F)	10 mm (0.4 inches)	82%	very high
December Weather	12°C (54°F)	13 mm (0.5 inches)	84%	high