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September Weather in Columbia, United States

Last updated: June 24, 2025

In September, the average temperature in Columbia, United States is a warm 26°C (80°F). Expect a broad range, with minimums dipping to 12°C (54°F) and maximums soaring up to 40°C (104°F). Be prepared for some rain, as the area receives an average precipitation of 96 mm (3.8 in) over 8 days, accompanied by a high humidity level of 79%.

September Temperature in Columbia

In September in Columbia, the average temperature is 26°C (80°F). Maximums can reach 40°C (104°F), and minimums can be as low as 12°C (54°F). Travelers should be prepared for warm days and cooler nights, so packing versatile clothing is essential.

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 26°C (80°F), with highs reaching up to 40°C (104°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec495362667580828279695653
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 96 mm (3.8 in) over the course of 8 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 96 mm (3.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1131691141401441311131209612080124
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 79%. With an average temperature of 26°C (80°F), this humidity feels like an enveloping warm blanket, making travel feel slightly sluggish and prompting frequent hydration breaks to stay comfortable while exploring the sights.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%83%80%81%81%78%79%79%79%77%85%88%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111112121110864
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 Weather10°C (49°F)112 mm (4.4 inches)83%moderate
February Weather12°C (54°F)169 mm (6.6 inches)83%high
March Weather17°C (62°F)114 mm (4.5 inches)80%very high
April Weather19°C (66°F)140 mm (5.5 inches)81%extreme
May Weather24°C (75°F)144 mm (5.7 inches)81%extreme
June Weather27°C (80°F)131 mm (5.1 inches)78%extreme
July Weather28°C (83°F)113 mm (4.4 inches)79%extreme
August Weather28°C (83°F)120 mm (4.7 inches)79%extreme
September Weather26°C (80°F)96 mm (3.8 inches)79%very high
October Weather21°C (70°F)120 mm (4.7 inches)77%very high
November Weather13°C (56°F)80 mm (3.2 inches)85%high
December Weather12°C (53°F)124 mm (4.9 inches)88%moderate

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