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September Weather in Farmington, United States

Last updated: June 24, 2025

In Farmington, United States, the average temperature in September is a pleasant 18°C (65°F). Visitors can expect a minimum of 2°C (35°F) on cooler days, while temperatures can soar to a maximum of 33°C (91°F). With an average precipitation of 120 mm (4.7 in) over 9 days, the humidity hovers around a steamy 81%, creating a tropical atmosphere.

September Temperature in Farmington

In September in Farmington, the average temperature is 18°C (65°F). The maximum can reach 33°C (91°F), while the minimum can be as low as 2°C (35°F). Pack accordingly for a varied climate to fully enjoy your trip to Farmington.

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 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec171733435971757164483424
Data source: Temperature data for Farmington generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Farmington

In Farmington in September, the precipitation amount is 120 mm (4.7 in) over the course of 9 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 120 mm (4.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec3036608413797107135120923649
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Farmington

In Farmington in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%90%85%84%78%80%81%81%81%84%88%84%
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 is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
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.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (17°F)30 mm (1.2 inches)87%low
February Weather-8°C (17°F)36 mm (1.4 inches)90%moderate
March Weather1°C (34°F)60 mm (2.4 inches)85%moderate
April Weather6°C (44°F)84 mm (3.3 inches)84%high
May Weather15°C (59°F)137 mm (5.4 inches)78%very high
June Weather22°C (72°F)97 mm (3.8 inches)80%very high
July Weather24°C (75°F)106 mm (4.2 inches)81%very high
August Weather22°C (71°F)134 mm (5.3 inches)81%very high
September Weather18°C (65°F)120 mm (4.7 inches)81%high
October Weather9°C (49°F)92 mm (3.6 inches)84%moderate
November Weather1°C (34°F)36 mm (1.4 inches)88%moderate
December Weather-5°C (24°F)49 mm (1.9 inches)84%low

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