September Weather in Columbia Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Columbia Falls, United States hovers around 16°C (61°F), with a minimum dropping to 3°C (38°F) and a maximum peaking at 27°C (81°F). Expect moderate precipitation of about 93 mm (3.7 in) over 8 days, coupled with an average humidity of 77%, providing a refreshing yet humid atmosphere.

September Temperature in Columbia Falls

In September in Columbia Falls, the average temperature is 16°C (61°F), with maximums reaching 27°C (81°F) and minimums dropping as low as 3°C (38°F). It's a great time to visit for those who enjoy mild weather and outdoor activities!

September Weather in Columbia Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Columbia Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Columbia Falls, September typically has an average temperature of 16°C (61°F), with highs reaching up to 27°C (81°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec242531425160666760513929
Data source: Temperature data for Columbia Falls generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Columbia Falls

In Columbia Falls in September, the total precipitation amount is 93 mm (3.7 in) over the course of 8 days.

September Precipitation Trends in Columbia Falls

The chart displays monthly precipitation patterns in Columbia Falls, 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 Columbia Falls, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec105968013811098888093119138141
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Columbia Falls

In Columbia Falls in September humidity is 77%. With an average temperature of 16°C (61°F), this humidity feels like a slight heaviness in the air, making every step feel a touch more effortful while traveling. The dampness clings to your skin, adding a layer of discomfort, yet the mild temperature invites you to explore the surroundings, blending the challenge of the humidity with an opportunity for a refreshing adventure.

September Average Humidity in Columbia Falls

This chart illustrates the average monthly humidity levels in Columbia Falls, 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 Columbia Falls is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%85%81%76%74%74%74%77%82%85%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Columbia Falls

In Columbia Falls 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 Columbia Falls.

Maximum UV Index Levels in Columbia Falls for September

The chart shows the monthly maximum UV Index (UVI) for Columbia Falls 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 Columbia Falls typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910887532
Data source: Columbia Falls 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 Columbia Falls Compares to Other Months

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

This table compares monthly weather conditions in Columbia Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)105 mm (4.1 inches)88%low
February Weather-4°C (26°F)96 mm (3.8 inches)88%moderate
March Weather0°C (32°F)80 mm (3.1 inches)85%moderate
April Weather6°C (42°F)138 mm (5.4 inches)81%high
May Weather11°C (52°F)110 mm (4.3 inches)76%very high
June Weather16°C (61°F)98 mm (3.9 inches)74%very high
July Weather19°C (66°F)88 mm (3.5 inches)74%very high
August Weather19°C (67°F)80 mm (3.2 inches)74%very high
September Weather16°C (61°F)93 mm (3.7 inches)77%high
October Weather10°C (51°F)119 mm (4.7 inches)82%moderate
November Weather4°C (39°F)138 mm (5.4 inches)85%moderate
December Weather-2°C (29°F)141 mm (5.5 inches)84%low

Compare Columbia Falls's Climate with Cities Worldwide