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September Weather in Miles City, United States

Last updated: June 24, 2025

In September, the average temperature in Miles City, United States hovers around 17°C (63°F). Expect a range from a chilly 0°C (32°F) to a scorching 37°C (99°F), making it a month of contrasts. During this time, precipitation typically measures 51 mm (2.0 in) over the course of about 5 days, contributing to an average humidity of 67%. Stay prepared for variable weather!

September Temperature in Miles City

In September in Miles City, the average temperature is 17°C (63°F). Maximums can reach 37°C (99°F), while minimums can drop as low as 0°C (32°F). Be sure to pack accordingly as the weather can vary greatly, making it ideal to prepare for both warm days and cool nights.

September Weather in Miles City: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Miles City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Miles City, September typically has an average temperature of 17°C (63°F), with highs reaching up to 37°C (99°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec221734435669777362453527
Data source: Temperature data for Miles City 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 Miles City

In Miles City in September, the precipitation amount is 51 mm (2.0 in) over a period of 5 days.

September Precipitation Trends in Miles City

The chart displays monthly precipitation patterns in Miles City, 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 Miles City, September typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec122620404945292451351819
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Miles City

In Miles City in September, humidity is 67%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket wrapping around you, making travel refreshing yet slightly muggy, as you navigate the sights with a pleasant, if slightly sticky, embrace.

September Average Humidity in Miles City

This chart illustrates the average monthly humidity levels in Miles City, 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 Miles City is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%83%76%70%76%78%78%73%67%68%77%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Miles City

In Miles City 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 Miles City.

Maximum UV Index Levels in Miles City for September

The chart shows the monthly maximum UV Index (UVI) for Miles City 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 Miles City typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24599101098532
Data source: Miles City 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 Miles City Compares to Other Months

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

This table compares monthly weather conditions in Miles City, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)11 mm (0.5 inches)80%low
February Weather-8°C (18°F)26 mm (1.0 inches)83%moderate
March Weather1°C (34°F)20 mm (0.8 inches)75%moderate
April Weather6°C (44°F)40 mm (1.6 inches)70%very high
May Weather13°C (57°F)48 mm (1.9 inches)76%very high
June Weather21°C (69°F)45 mm (1.8 inches)78%very high
July Weather25°C (77°F)29 mm (1.1 inches)78%very high
August Weather23°C (73°F)24 mm (0.9 inches)73%very high
September Weather17°C (63°F)51 mm (2.0 inches)67%very high
October Weather7°C (46°F)35 mm (1.4 inches)68%moderate
November Weather2°C (35°F)18 mm (0.7 inches)77%moderate
December Weather-3°C (27°F)19 mm (0.7 inches)84%low

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