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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), with temperatures ranging from a cool 13°C (56°F) to a scorching 38°C (100°F). Expect 115 mm (4.5 in) of precipitation spread over 11 days, contributing to an average humidity level of 79%. Whether you're soaking up the sun or dodging the rain, it's a month of dynamic weather!

September Temperature in Columbia

In September, in Columbia, the average temperature is 26°C (80°F). Maximums can reach 38°C (100°F), and minimums can be as low as 13°C (56°F). This makes Columbia an ideal destination for travelers seeking warm weather with a comfortable range of temperatures.

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 38°C (100°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec525862677580828279725955
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 total precipitation amount is 115 mm (4.5 in) spread over 11 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 115 mm (4.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9011278112981111111281158947127
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%82%79%77%74%70%78%78%79%74%83%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121110864
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 Weather11°C (52°F)90 mm (3.6 inches)83%moderate
February Weather15°C (58°F)112 mm (4.4 inches)82%very high
March Weather17°C (62°F)78 mm (3.1 inches)79%very high
April Weather19°C (67°F)112 mm (4.4 inches)77%extreme
May Weather24°C (75°F)98 mm (3.9 inches)74%extreme
June Weather26°C (80°F)111 mm (4.4 inches)70%extreme
July Weather28°C (82°F)111 mm (4.4 inches)78%extreme
August Weather28°C (82°F)128 mm (5.1 inches)78%extreme
September Weather26°C (80°F)115 mm (4.5 inches)79%very high
October Weather22°C (73°F)89 mm (3.5 inches)74%very high
November Weather15°C (59°F)47 mm (1.9 inches)83%high
December Weather13°C (55°F)127 mm (5.0 inches)86%moderate

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