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September Weather in Columbia, United States

Last updated: June 24, 2025

The average temperature in Columbia, United States during September is a pleasant 14°C (57°F). Expect a wide range with minimum temperatures dropping to -5°C (24°F) and peaks reaching 29°C (84°F). You'll encounter around 75 mm (2.9 in) of precipitation spread over approximately 10 days, contributing to an average humidity of 77%.

September Temperature in Columbia

In September in Columbia, the average temperature is 14°C (57°F), with maximums reaching 29°C (84°F) and minimums dropping as low as -5°C (24°F). Be sure to pack layers and prepare for varying weather conditions during your travels.

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

The chart illustrates September temperature patterns in Columbia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Columbia, September typically has an average temperature of 14°C (57°F), with highs reaching up to 29°C (84°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec151825385261666457453020
Data source: Temperature data for Columbia 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

In Columbia in September, the precipitation amount is 75 mm (2.9 in) spread over a period of 10 days.

September Precipitation Trends in Columbia

The chart displays monthly precipitation patterns in Columbia, 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, September typically receives around 75 mm (2.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8986781191041051181027513911195
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Columbia

In Columbia in September, humidity is 77%. With an average temperature of 14°C (57°F), this humidity feels like a heavy blanket wrapping around you, making outdoor exploration feel muggy and leaving you craving the shade while you travel.

September Average Humidity in Columbia

This chart illustrates the average monthly humidity levels in Columbia, 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 is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Columbia

In Columbia 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.

Maximum UV Index Levels in Columbia for September

The chart shows the monthly maximum UV Index (UVI) for Columbia 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 typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Columbia 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 Compares to Other Months

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

This table compares monthly weather conditions in Columbia, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)89 mm (3.5 inches)91%low
February Weather-8°C (18°F)86 mm (3.4 inches)89%moderate
March Weather-4°C (26°F)78 mm (3.1 inches)85%moderate
April Weather4°C (39°F)119 mm (4.7 inches)84%very high
May Weather11°C (52°F)104 mm (4.1 inches)78%very high
June Weather16°C (61°F)105 mm (4.1 inches)72%very high
July Weather19°C (66°F)118 mm (4.6 inches)75%very high
August Weather18°C (64°F)102 mm (4.0 inches)74%very high
September Weather14°C (57°F)75 mm (2.9 inches)77%high
October Weather7°C (46°F)139 mm (5.5 inches)85%moderate
November Weather-1°C (31°F)111 mm (4.4 inches)86%moderate
December Weather-6°C (21°F)95 mm (3.7 inches)85%low

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