September Weather in Columbia, United States

Last updated: June 24, 2025

In September, the average temperature in Columbia, United States hovers around 23°C (74°F), making for a pleasant climate. Expect a range from a cool minimum of 9°C (48°F) to a sizzling maximum of 36°C (97°F). You might want to carry an umbrella, as precipitation averages 110 mm (4.3 in) over 9 days. Additionally, with an average humidity of 64%, the air can feel quite refreshing!

September Temperature in Columbia

In September in Columbia, the average temperature is 23°C (74°F). Maximums can reach 36°C (97°F) while minimums can drop to as low as 9°C (48°F). This varied climate makes Columbia an ideal destination for travelers seeking both warmth and cooler moments throughout the day.

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 23°C (74°F), with highs reaching up to 36°C (97°F) and lows dropping to around 9°C (48°F).

Data source: Temperature data for Columbia generated using information from the Copernicus Climate Change Service.

September Precipitation in Columbia

In Columbia in September, the precipitation amount is 110 mm (4.3 in) over the course of 9 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 110 mm (4.3 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Columbia

In Columbia in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

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 64%, offering insight into how humid the weather typically is during this month.

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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	112 mm (4.4 inches)	87%	moderate
February Weather	8°C (46°F)	179 mm (7.0 inches)	87%	high
March Weather	12°C (54°F)	172 mm (6.8 inches)	85%	high
April Weather	15°C (60°F)	154 mm (6.1 inches)	82%	very high
May Weather	21°C (70°F)	111 mm (4.4 inches)	83%	very high
June Weather	25°C (77°F)	126 mm (5.0 inches)	82%	extreme
July Weather	26°C (80°F)	128 mm (5.0 inches)	78%	extreme
August Weather	26°C (78°F)	119 mm (4.7 inches)	67%	very high
September Weather	23°C (74°F)	110 mm (4.3 inches)	64%	very high
October Weather	17°C (64°F)	118 mm (4.6 inches)	74%	high
November Weather	9°C (49°F)	77 mm (3.0 inches)	87%	moderate
December Weather	8°C (46°F)	149 mm (5.9 inches)	88%	moderate