September Weather in Santillan, Mexico

Last updated: August 27, 2025

In September, the average temperature in Santillan, Mexico hovers around 19°C (66°F), with lows of 9°C (48°F) and highs reaching 30°C (86°F). Rainfall is fairly common, with 132 mm (5.2 in) spread over 16 days of the month. Additionally, you can expect an average humidity level of 81%, creating a pleasantly warm and slightly humid atmosphere.

September Temperature in Santillan

In September in Santillan, the average temperature is 19°C (66°F). Maximums can reach 30°C (86°F) and minimums can drop to as low as 9°C (48°F). This makes it a great time for travelers to enjoy pleasant weather while exploring the area.

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

The chart illustrates September temperature patterns in Santillan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santillan, September typically has an average temperature of 19°C (66°F), with highs reaching up to 30°C (86°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Santillan

In Santillan in September, the precipitation amount is 132 mm (5.2 in) over the course of 16 days.

September Precipitation Trends in Santillan

The chart displays monthly precipitation patterns in Santillan, 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 Santillan, September typically receives around 132 mm (5.2 inches) of precipitation spread over approximately 16 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 Santillan

In Santillan in September, humidity is 81%. With an average temperature of 19°C (66°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel both muggy and slightly stifling, often leading to a need for frequent breaks in the shade.

September Average Humidity in Santillan

This chart illustrates the average monthly humidity levels in Santillan, 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 Santillan is approximately 81%, 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 Santillan

In Santillan in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Santillan, you can check here.

Maximum UV Index Levels in Santillan for September

The chart shows the monthly maximum UV Index (UVI) for Santillan 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 Santillan typically reaches 14, which falls under the extreme exposure category.

Data source: Santillan 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 Santillan Compares to Other Months

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

This table compares monthly weather conditions in Santillan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (58°F)	6 mm (0.3 inches)	74%	very high
February Weather	17°C (62°F)	7 mm (0.3 inches)	65%	extreme
March Weather	19°C (66°F)	12 mm (0.5 inches)	58%	extreme
April Weather	21°C (70°F)	14 mm (0.6 inches)	58%	extreme
May Weather	22°C (72°F)	36 mm (1.4 inches)	67%	extreme
June Weather	20°C (69°F)	126 mm (5.0 inches)	76%	extreme
July Weather	20°C (67°F)	91 mm (3.6 inches)	67%	extreme
August Weather	20°C (68°F)	90 mm (3.5 inches)	68%	extreme
September Weather	19°C (66°F)	132 mm (5.2 inches)	81%	extreme
October Weather	18°C (64°F)	63 mm (2.5 inches)	83%	extreme
November Weather	16°C (61°F)	20 mm (0.8 inches)	84%	very high
December Weather	14°C (58°F)	4 mm (0.2 inches)	81%	very high