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September Weather in Farmington, United States

Last updated: June 24, 2025

In September, the average temperature in Farmington, United States hovers around 18°C (65°F). Expect a range from a brisk 3°C (38°F) to a warm 31°C (88°F). During this time, precipitation totals about 112 mm (4.4 in) spread over 10 days, contributing to an average humidity of 68%. Stay prepared for a touch of rain and enjoy the varying temperatures!

September Temperature in Farmington

In September in Farmington, the average temperature is 18°C (65°F). The maximum can reach 31°C (88°F) and the minimum can be as low as 3°C (38°F). Be sure to pack both light clothing for warm days and warmer layers for cool evenings while traveling.

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 31°C (88°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec303540506067727065554135
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 total precipitation amount is 112 mm (4.4 in) over the course of 10 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 112 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec971441231411521511069111311993133
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 68%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel somewhat sticky and requiring occasional breaks for refreshing hydration.

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 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
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-1°C (30°F)97 mm (3.8 inches)86%moderate
February Weather1°C (35°F)144 mm (5.7 inches)86%moderate
March Weather4°C (40°F)123 mm (4.8 inches)86%high
April Weather10°C (50°F)141 mm (5.6 inches)84%very high
May Weather16°C (60°F)152 mm (6.0 inches)78%very high
June Weather20°C (68°F)151 mm (5.9 inches)79%very high
July Weather22°C (72°F)106 mm (4.2 inches)70%very high
August Weather21°C (71°F)91 mm (3.6 inches)59%very high
September Weather18°C (65°F)112 mm (4.4 inches)68%very high
October Weather13°C (56°F)119 mm (4.7 inches)80%high
November Weather5°C (41°F)93 mm (3.7 inches)86%moderate
December Weather2°C (35°F)133 mm (5.2 inches)85%moderate

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