September Weather in Four Corners, United States

Last updated: June 24, 2025

In Four Corners, United States, the average temperature in September hovers around 27°C (80°F), offering a pleasant atmosphere for outdoor adventures. However, be prepared for temperature swings, with minimums dipping to 12°C (54°F) and soaring maximums reaching up to 38°C (100°F). Precipitation is moderate, totaling 157 mm (6.2 in) over 15 days, so it's wise to carry an umbrella. The average humidity level is around 73%, adding a touch of warmth to the air.

September Temperature in Four Corners

In September in Four Corners, the average temperature is 27°C (80°F), with maximums reaching up to 38°C (100°F) and minimums dropping as low as 12°C (54°F). This range offers a diverse climate, making it an ideal destination for travelers seeking both warm sunny days and cooler evenings.

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 (80°F), with highs reaching up to 38°C (100°F) and lows dropping to around 12°C (54°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 157 mm (6.2 in) over a period of 15 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 157 mm (6.2 inches) of precipitation spread over approximately 15 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 73%. With an average temperature of 27°C (80°F), this humidity feels like a warm, enveloping blanket that can make traveling feel sticky and slightly uncomfortable, prompting frequent breaks in the shade and plenty of hydration.

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 73%, 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 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, 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 10, which falls under the very high 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	12°C (55°F)	81 mm (3.2 inches)	78%	moderate
February Weather	14°C (58°F)	92 mm (3.6 inches)	81%	very high
March Weather	19°C (66°F)	72 mm (2.8 inches)	76%	very high
April Weather	21°C (70°F)	80 mm (3.1 inches)	79%	extreme
May Weather	25°C (78°F)	165 mm (6.5 inches)	79%	extreme
June Weather	28°C (83°F)	156 mm (6.1 inches)	74%	extreme
July Weather	29°C (84°F)	125 mm (4.9 inches)	71%	extreme
August Weather	29°C (85°F)	167 mm (6.6 inches)	68%	extreme
September Weather	27°C (80°F)	157 mm (6.2 inches)	73%	very high
October Weather	22°C (72°F)	92 mm (3.6 inches)	75%	very high
November Weather	17°C (63°F)	75 mm (3.0 inches)	78%	high
December Weather	14°C (58°F)	106 mm (4.2 inches)	84%	moderate