September Weather in Colorado, Brazil

Last updated: August 22, 2025

In September, the average temperature in Colorado, Brazil is a warm 25°C (78°F). Expect a range between a cool 12°C (53°F) and a sizzling 39°C (102°F). While you enjoy the sunshine, be prepared for some rain, with 47 mm (1.8 in) of precipitation spread over 6 days. The average humidity sits comfortably at 47%, making it a great time to explore!

September Temperature in Colorado

In September in Colorado, the average temperature is 25°C (78°F). Maximum can reach 39°C (102°F) and minimum can be as low as 12°C (53°F). Be prepared for warm days and cooler nights, making it an ideal time for outdoor adventures and sightseeing.

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

The chart illustrates September temperature patterns in Colorado, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colorado, September typically has an average temperature of 25°C (78°F), with highs reaching up to 39°C (102°F) and lows dropping to around 12°C (53°F).

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

September Precipitation in Colorado

In Colorado in September, the total precipitation amount is 47 mm (1.8 in) spread over the course of 6 days.

September Precipitation Trends in Colorado

The chart displays monthly precipitation patterns in Colorado, 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 Colorado, September typically receives around 47 mm (1.8 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 Colorado

In Colorado in September, humidity is 47%. With an average temperature of 25°C (78°F), this humidity feels like a comfortable embrace, making it ideal for leisurely strolls and outdoor adventures while still allowing you to enjoy the scenery without feeling too sticky or overheated.

September Average Humidity in Colorado

This chart illustrates the average monthly humidity levels in Colorado, 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 Colorado is approximately 47%, 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 Colorado

In Colorado 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 Colorado.

Maximum UV Index Levels in Colorado for September

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

Data source: Colorado 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 Colorado Compares to Other Months

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

This table compares monthly weather conditions in Colorado, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (80°F)	154 mm (6.1 inches)	84%	extreme
February Weather	26°C (80°F)	116 mm (4.6 inches)	81%	extreme
March Weather	26°C (80°F)	83 mm (3.3 inches)	81%	extreme
April Weather	24°C (76°F)	44 mm (1.7 inches)	75%	extreme
May Weather	21°C (71°F)	70 mm (2.8 inches)	68%	very high
June Weather	20°C (69°F)	67 mm (2.6 inches)	64%	high
July Weather	20°C (68°F)	17 mm (0.7 inches)	58%	high
August Weather	21°C (70°F)	66 mm (2.6 inches)	49%	very high
September Weather	25°C (78°F)	47 mm (1.8 inches)	47%	extreme
October Weather	25°C (78°F)	117 mm (4.6 inches)	44%	extreme
November Weather	26°C (79°F)	95 mm (3.7 inches)	68%	extreme
December Weather	27°C (80°F)	119 mm (4.7 inches)	82%	extreme