September Weather in Four Corners, United States

Last updated: June 24, 2025

In September, the average temperature in Four Corners, United States is a pleasant 27°C (81°F). Expect a comfortable minimum of 18°C (65°F) and a warm maximum of 34°C (94°F). However, be prepared for 194 mm (7.6 in) of precipitation spread across 20 days, contributing to a notable average humidity of 83%.

September Temperature in Four Corners

In September in Four Corners, the average temperature is 27°C (81°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 18°C (65°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

September Weather in Four Corners: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Four Corners, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Four Corners, September typically has an average temperature of 27°C (81°F), with highs reaching up to 34°C (94°F) and lows dropping to around 18°C (65°F).

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

September Precipitation in Four Corners

In Four Corners in September, the precipitation amount is 194 mm (7.6 in) over the course of 20 days.

September Precipitation Trends in Four Corners

The chart displays monthly precipitation patterns in Four Corners, 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 Four Corners, September typically receives around 194 mm (7.6 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 Four Corners

In Four Corners in September humidity is 83%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket enveloping you, making sightseeing and outdoor activities feel more exhausting and requiring frequent breaks to relax in the shade or cool off.

September Average Humidity in Four Corners

This chart illustrates the average monthly humidity levels in Four Corners, 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 Four Corners is approximately 83%, 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 Four Corners

In Four Corners 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 Four Corners.

Maximum UV Index Levels in Four Corners for September

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

Data source: Four Corners 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 Four Corners Compares to Other Months

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

This table compares monthly weather conditions in Four Corners, 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 (61°F)	41 mm (1.6 inches)	83%	moderate
February Weather	19°C (67°F)	54 mm (2.1 inches)	80%	very high
March Weather	20°C (69°F)	17 mm (0.7 inches)	75%	very high
April Weather	23°C (74°F)	72 mm (2.8 inches)	70%	extreme
May Weather	26°C (78°F)	124 mm (4.9 inches)	68%	extreme
June Weather	27°C (81°F)	228 mm (9.0 inches)	75%	extreme
July Weather	27°C (81°F)	250 mm (9.8 inches)	79%	extreme
August Weather	28°C (82°F)	249 mm (9.8 inches)	81%	extreme
September Weather	27°C (81°F)	194 mm (7.6 inches)	83%	extreme
October Weather	25°C (78°F)	91 mm (3.6 inches)	81%	very high
November Weather	20°C (69°F)	44 mm (1.7 inches)	82%	high
December Weather	18°C (64°F)	59 mm (2.3 inches)	84%	moderate