September Weather in Hermosillo, Mexico

Last updated: August 27, 2025

The average temperature in Hermosillo, Mexico during September reaches a warm 30°C (87°F). Temperatures can vary significantly, with a minimum of 16°C (60°F) and soaring to a maximum of 44°C (111°F). Expect about 47 mm (1.9 in) of precipitation over 6 days, and prepare for high humidity levels averaging 80%.

September Temperature in Hermosillo

In September in Hermosillo, the average temperature is 30°C (87°F). The maximum can reach 44°C (111°F), and the minimum can be as low as 16°C (60°F). Be prepared for warm days and cool evenings when traveling to Hermosillo during this time.

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

The chart illustrates September temperature patterns in Hermosillo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hermosillo, September typically has an average temperature of 30°C (87°F), with highs reaching up to 44°C (111°F) and lows dropping to around 16°C (60°F).

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

September Precipitation in Hermosillo

In Hermosillo in September, the precipitation amount is 47 mm (1.9 in) over the course of 6 days.

September Precipitation Trends in Hermosillo

The chart displays monthly precipitation patterns in Hermosillo, 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 Hermosillo, September typically receives around 47 mm (1.9 inches) of precipitation spread over approximately 6 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 Hermosillo

In Hermosillo in September humidity is 80%. With an average temperature of 30°C (87°F), this humidity feels like you're walking through a warm, damp blanket that clings to your skin, making it difficult to enjoy outdoor activities without frequent breaks for hydration and shade.

September Average Humidity in Hermosillo

This chart illustrates the average monthly humidity levels in Hermosillo, 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 Hermosillo is approximately 80%, 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 Hermosillo

In Hermosillo in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Hermosillo.

Maximum UV Index Levels in Hermosillo for September

The chart shows the monthly maximum UV Index (UVI) for Hermosillo 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 Hermosillo typically reaches 11, which falls under the extreme exposure category.

Data source: Hermosillo 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 Hermosillo Compares to Other Months

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

This table compares monthly weather conditions in Hermosillo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	16°C (62°F)	17 mm (0.7 inches)	76%	moderate
February Weather	18°C (64°F)	14 mm (0.6 inches)	68%	very high
March Weather	20°C (69°F)	13 mm (0.5 inches)	56%	very high
April Weather	25°C (77°F)	0 mm (0.0 inches)	42%	extreme
May Weather	27°C (81°F)	0 mm (0.0 inches)	36%	extreme
June Weather	32°C (90°F)	5 mm (0.2 inches)	33%	extreme
July Weather	33°C (91°F)	51 mm (2.0 inches)	47%	extreme
August Weather	33°C (91°F)	42 mm (1.7 inches)	71%	extreme
September Weather	30°C (87°F)	47 mm (1.9 inches)	80%	extreme
October Weather	27°C (81°F)	17 mm (0.7 inches)	73%	very high
November Weather	22°C (72°F)	15 mm (0.6 inches)	75%	high
December Weather	17°C (62°F)	12 mm (0.5 inches)	81%	moderate