September Weather in Farmington, United States

Last updated: June 24, 2025

In Farmington, United States, the average temperature in September is a pleasant 21°C (69°F). However, be prepared for a range of temperatures, as it can drop to a chilly 2°C (36°F) at night or soar up to a sweltering 36°C (97°F) during the day. Expect 25 mm (1.0 in) of precipitation over approximately 4 days, with an average humidity of 59% contributing to the overall climate experience.

September Temperature in Farmington

In September in Farmington, the average temperature is 21°C (69°F). Maximum temperatures can reach 36°C (97°F), while minimums can drop as low as 2°C (36°F). Be sure to pack for a wide range of temperatures during your travels.

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

The chart illustrates September temperature patterns in Farmington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Farmington, September typically has an average temperature of 21°C (69°F), with highs reaching up to 36°C (97°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Farmington

In Farmington in September, the precipitation amount is 25 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Farmington

The chart displays monthly precipitation patterns in Farmington, 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 Farmington, September typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 4 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 Farmington

In Farmington in September, humidity is 59%. With an average temperature of 21°C (69°F), this humidity feels like a comfortable embrace, making it ideal for exploring local attractions without the discomfort of excessive heat or stickiness.

September Average Humidity in Farmington

This chart illustrates the average monthly humidity levels in Farmington, 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 Farmington is approximately 59%, 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 Farmington

In Farmington 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 Farmington.

Maximum UV Index Levels in Farmington for September

The chart shows the monthly maximum UV Index (UVI) for Farmington 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 Farmington typically reaches 10, which falls under the very high exposure category.

Data source: Farmington 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 Farmington Compares to Other Months

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

This table compares monthly weather conditions in Farmington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	27 mm (1.1 inches)	85%	moderate
February Weather	2°C (36°F)	29 mm (1.1 inches)	86%	high
March Weather	7°C (45°F)	37 mm (1.5 inches)	76%	very high
April Weather	13°C (55°F)	12 mm (0.5 inches)	69%	extreme
May Weather	17°C (64°F)	21 mm (0.8 inches)	53%	extreme
June Weather	24°C (76°F)	7 mm (0.3 inches)	40%	extreme
July Weather	26°C (80°F)	21 mm (0.8 inches)	36%	extreme
August Weather	25°C (78°F)	7 mm (0.3 inches)	44%	extreme
September Weather	21°C (69°F)	25 mm (1.0 inches)	59%	very high
October Weather	12°C (54°F)	20 mm (0.8 inches)	74%	very high
November Weather	6°C (43°F)	15 mm (0.6 inches)	83%	moderate
December Weather	0°C (32°F)	25 mm (1.0 inches)	85%	moderate