September Weather in Los Santiagos, Mexico

Last updated: August 27, 2025

In September, the average temperature in Los Santiagos, Mexico hovers around 18°C (66°F), with a minimum dip to 10°C (50°F) and a maximum rise to 28°C (82°F). Expect around 198 mm (7.8 in) of precipitation spread over 20 days, contributing to an average humidity level of 84%. Prepare for a blend of warmth and moisture as you experience the vibrant climate of this location!

September Temperature in Los Santiagos

In September in Los Santiagos, the average temperature is 18°C (66°F). Maximum temperatures can reach 28°C (82°F), while minimums can drop as low as 10°C (50°F). Be sure to pack layers to accommodate both warm and cool weather during your travels!

September Weather in Los Santiagos: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Los Santiagos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Los Santiagos, September typically has an average temperature of 18°C (66°F), with highs reaching up to 28°C (82°F) and lows dropping to around 10°C (50°F).

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

September Precipitation in Los Santiagos

In Los Santiagos in September, the precipitation amount is 198 mm (7.8 in) during 20 days, indicating a significant level of rainfall for the region throughout that period.

September Precipitation Trends in Los Santiagos

The chart displays monthly precipitation patterns in Los Santiagos, 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 Los Santiagos, September typically receives around 198 mm (7.8 inches) of precipitation spread over approximately 20 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 Los Santiagos

In Los Santiagos in September humidity is 84%. With an average temperature of 18°C (66°F), this humidity feels like a warm wrap around your skin, making even short excursions feel heavy and sticky, requiring frequent breaks for hydration and relief from the muggy atmosphere.

September Average Humidity in Los Santiagos

This chart illustrates the average monthly humidity levels in Los Santiagos, 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 Los Santiagos is approximately 84%, 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 Los Santiagos

In Los Santiagos 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 Los Santiagos, you can check here.

Maximum UV Index Levels in Los Santiagos for September

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

Data source: Los Santiagos 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 Los Santiagos Compares to Other Months

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

This table compares monthly weather conditions in Los Santiagos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	16 mm (0.6 inches)	64%	very high
February Weather	15°C (59°F)	17 mm (0.7 inches)	57%	extreme
March Weather	18°C (65°F)	7 mm (0.3 inches)	46%	extreme
April Weather	20°C (68°F)	2 mm (0.1 inches)	42%	extreme
May Weather	21°C (71°F)	29 mm (1.2 inches)	51%	extreme
June Weather	21°C (71°F)	165 mm (6.5 inches)	74%	extreme
July Weather	19°C (66°F)	273 mm (10.7 inches)	79%	extreme
August Weather	19°C (67°F)	172 mm (6.8 inches)	81%	extreme
September Weather	18°C (66°F)	198 mm (7.8 inches)	84%	extreme
October Weather	18°C (64°F)	75 mm (3.0 inches)	75%	extreme
November Weather	15°C (60°F)	21 mm (0.8 inches)	71%	very high
December Weather	13°C (56°F)	15 mm (0.6 inches)	74%	very high