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September Weather in Billings, United States

Last updated: June 24, 2025

In September, the average temperature in Billings, United States hovers around 24°C (76°F). However, temperatures can vary significantly, with a minimum of 6°C (44°F) and a scorching maximum of 38°C (101°F). Additionally, expect about 78 mm (3.1 in) of precipitation spread over 7 days, accompanied by an average humidity level of 67%.

September Temperature in Billings

In September in Billings, the average temperature is 24°C (76°F). Maximum can reach 38°C (101°F) and minimum can be as low as 6°C (44°F). Pack accordingly to enjoy a range of temperatures during your travels.

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

The chart illustrates September temperature patterns in Billings, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Billings, September typically has an average temperature of 24°C (76°F), with highs reaching up to 38°C (101°F) and lows dropping to around 6°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec373852586979838075614842
Data source: Temperature data for Billings 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 Billings

In Billings in September, the total precipitation amount is 78 mm (3.1 in) over a duration of 7 days.

September Precipitation Trends in Billings

The chart displays monthly precipitation patterns in Billings, 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 Billings, September typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec453589911581165887781112829
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Billings

In Billings in September humidity is 67%. With an average temperature of 24°C (76°F), this humidity feels like a warm, steamy embrace, making travel slightly more challenging as you navigate through the thick air.

September Average Humidity in Billings

This chart illustrates the average monthly humidity levels in Billings, 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 Billings is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%67%70%82%82%81%76%67%72%80%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Billings

In Billings in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Billings.

Maximum UV Index Levels in Billings for September

The chart shows the monthly maximum UV Index (UVI) for Billings 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 Billings typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710101111109753
Data source: Billings 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 Billings Compares to Other Months

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

This table compares monthly weather conditions in Billings, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)45 mm (1.8 inches)75%moderate
February Weather4°C (39°F)35 mm (1.4 inches)76%high
March Weather11°C (52°F)89 mm (3.5 inches)67%high
April Weather15°C (59°F)91 mm (3.6 inches)70%very high
May Weather20°C (69°F)158 mm (6.2 inches)82%very high
June Weather26°C (80°F)116 mm (4.5 inches)82%extreme
July Weather28°C (83°F)57 mm (2.3 inches)81%extreme
August Weather27°C (81°F)87 mm (3.4 inches)76%very high
September Weather24°C (76°F)78 mm (3.1 inches)67%very high
October Weather16°C (61°F)111 mm (4.4 inches)72%high
November Weather9°C (49°F)28 mm (1.1 inches)80%moderate
December Weather5°C (42°F)29 mm (1.1 inches)83%moderate

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