September Weather in Sonora, United States

Last updated: June 24, 2025

In Sonora, United States, the average temperature in September hovers around 25°C (78°F), offering a pleasant climate for outdoor activities. However, be prepared for temperature fluctuations, as it can dip to a minimum of 7°C (45°F) and reach a sizzling maximum of 38°C (100°F). With an average precipitation of 67 mm (2.6 in) spread over 5 days, and a humidity level of 67%, it's wise to pack accordingly for a comfortable visit!

September Temperature in Sonora

In September in Sonora, the average temperature is 25°C (78°F). Maximum temperatures can reach 38°C (100°F), while minimum temperatures can drop to as low as 7°C (45°F). This makes it an ideal time for travelers seeking pleasant weather with opportunities for both warm and cooler experiences.

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

The chart illustrates September temperature patterns in Sonora, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sonora, September typically has an average temperature of 25°C (78°F), with highs reaching up to 38°C (100°F) and lows dropping to around 7°C (45°F).

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

September Precipitation in Sonora

In Sonora in September, the precipitation amount is 67 mm (2.6 in) over a span of 5 days.

September Precipitation Trends in Sonora

The chart displays monthly precipitation patterns in Sonora, 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 Sonora, September typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 5 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 Sonora

In Sonora in September humidity is 67%. With an average temperature of 25°C (78°F), this humidity feels like traveling through a warm, heavy blanket that wraps around you, making outdoor activities feel a bit more strenuous, but also enveloping you in a tropical embrace that can be refreshing if you take breaks in the shade.

September Average Humidity in Sonora

This chart illustrates the average monthly humidity levels in Sonora, 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 Sonora is approximately 67%, 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 Sonora

In Sonora 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 Sonora.

Maximum UV Index Levels in Sonora for September

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

Data source: Sonora 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 Sonora Compares to Other Months

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

This table compares monthly weather conditions in Sonora, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	25 mm (1.0 inches)	74%	moderate
February Weather	11°C (52°F)	31 mm (1.2 inches)	74%	very high
March Weather	16°C (62°F)	54 mm (2.1 inches)	68%	very high
April Weather	20°C (68°F)	48 mm (1.9 inches)	70%	extreme
May Weather	24°C (75°F)	103 mm (4.1 inches)	77%	extreme
June Weather	27°C (81°F)	47 mm (1.8 inches)	76%	extreme
July Weather	29°C (84°F)	19 mm (0.7 inches)	66%	extreme
August Weather	29°C (84°F)	35 mm (1.4 inches)	60%	extreme
September Weather	25°C (78°F)	67 mm (2.6 inches)	67%	extreme
October Weather	20°C (68°F)	76 mm (3.0 inches)	72%	very high
November Weather	14°C (58°F)	15 mm (0.6 inches)	83%	high
December Weather	11°C (52°F)	27 mm (1.1 inches)	85%	moderate