September Weather in El Rosario, Mexico

Last updated: August 27, 2025

In El Rosario, Mexico, the average temperature in September hovers around 19°C (67°F). This month experiences a minimum of 10°C (51°F) and can soar to a maximum of 29°C (85°F). Expect 184 mm (7.2 in) of precipitation over approximately 20 days, paired with a notable average humidity of 84%.

September Temperature in El Rosario

In September in El Rosario, the average temperature is 19°C (67°F). Maximums can reach 29°C (85°F), while minimums can be as low as 10°C (51°F). Overall, it's a pleasant time for traveling, ideal for outdoor activities and exploration.

September Weather in El Rosario: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in El Rosario, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In El Rosario, September typically has an average temperature of 19°C (67°F), with highs reaching up to 29°C (85°F) and lows dropping to around 10°C (51°F).

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

September Precipitation in El Rosario

In El Rosario in September, the total precipitation amount is 184 mm (7.2 in) during a span of 20 days.

September Precipitation Trends in El Rosario

The chart displays monthly precipitation patterns in El Rosario, 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 El Rosario, September typically receives around 184 mm (7.2 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 El Rosario

In El Rosario in September humidity is 84%. With an average temperature of 19°C (67°F), this humidity feels like a warm, sticky embrace that can make traveling somewhat uncomfortable, as the air becomes thick and heavy, often leaving you feeling fatigued and in need of constant hydration.

September Average Humidity in El Rosario

This chart illustrates the average monthly humidity levels in El Rosario, 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 El Rosario 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 El Rosario

In El Rosario 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 El Rosario.

Maximum UV Index Levels in El Rosario for September

The chart shows the monthly maximum UV Index (UVI) for El Rosario 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 El Rosario typically reaches 13, which falls under the extreme exposure category.

Data source: El Rosario 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 El Rosario Compares to Other Months

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

This table compares monthly weather conditions in El Rosario, 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)	11 mm (0.4 inches)	64%	very high
February Weather	16°C (62°F)	11 mm (0.4 inches)	57%	extreme
March Weather	19°C (67°F)	5 mm (0.2 inches)	46%	extreme
April Weather	21°C (70°F)	1 mm (0.0 inches)	42%	extreme
May Weather	23°C (73°F)	26 mm (1.0 inches)	51%	extreme
June Weather	22°C (72°F)	163 mm (6.4 inches)	74%	extreme
July Weather	20°C (68°F)	264 mm (10.4 inches)	79%	extreme
August Weather	20°C (68°F)	192 mm (7.6 inches)	81%	extreme
September Weather	19°C (67°F)	184 mm (7.2 inches)	84%	extreme
October Weather	19°C (66°F)	78 mm (3.1 inches)	75%	extreme
November Weather	17°C (62°F)	17 mm (0.7 inches)	71%	very high
December Weather	14°C (58°F)	8 mm (0.3 inches)	74%	very high