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September Weather in Columbia Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Columbia Falls, United States hovers around 13°C (56°F), with fluctuations ranging from a chilly -2°C (28°F) to a balmy 31°C (88°F). Expect about 50 mm (2.0 in) of precipitation over 8 days, and enjoy an average humidity of 69%. This blend of climate factors makes for a unique atmospheric experience!

September Temperature in Columbia Falls

In September in Columbia Falls, the average temperature is 13°C (56°F). The maximum can reach 31°C (88°F), while the minimum can be as low as -2°C (28°F). This variety in temperatures makes it essential for travelers to pack layers to stay comfortable in both warm and cool conditions.

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 13°C (56°F), with highs reaching up to 31°C (88°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec241932395058666555413328
Data source: Temperature data for Columbia Falls 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 Columbia Falls

In Columbia Falls in September, the total precipitation amount is 50 mm (2.0 in) spread over 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 50 mm (2.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec608761887167232750768281
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Columbia Falls

In Columbia Falls in September humidity is 69%. With an average temperature of 13°C (56°F), this humidity feels like a cool and damp embrace, which might make traveling somewhat uncomfortable as the air weighs down on you, adding to the chill and making your clothes cling.

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 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%91%88%84%78%77%79%69%69%78%87%94%
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.
JanFebMarAprMayJunJulAugSepOctNovDec246799997532
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 (24°F)60 mm (2.4 inches)93%low
February Weather-7°C (20°F)87 mm (3.4 inches)91%moderate
March Weather0°C (32°F)61 mm (2.4 inches)88%high
April Weather4°C (39°F)87 mm (3.4 inches)84%high
May Weather10°C (50°F)71 mm (2.8 inches)78%very high
June Weather15°C (59°F)67 mm (2.7 inches)77%very high
July Weather19°C (67°F)23 mm (0.9 inches)79%very high
August Weather18°C (66°F)27 mm (1.0 inches)69%very high
September Weather13°C (56°F)50 mm (2.0 inches)69%high
October Weather5°C (42°F)76 mm (3.0 inches)78%moderate
November Weather1°C (34°F)82 mm (3.2 inches)87%moderate
December Weather-2°C (28°F)81 mm (3.2 inches)94%low

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