September Weather in Cornelius, United States

Last updated: June 24, 2025

In September, the average temperature in Cornelius, United States hovers around 23°C (74°F), with a minimum dipping to 7°C (45°F) and a maximum reaching up to 35°C (96°F). Expect about 134 mm (5.3 in) of precipitation spread over 9 days, coupled with an average humidity level of 75%. Whether you're looking to explore or relax, be prepared for a variety of weather conditions!

September Temperature in Cornelius

In September in Cornelius, the average temperature is 23°C (74°F). Maximum temperatures can reach up to 35°C (96°F), while minimums can drop as low as 7°C (45°F). This makes it an ideal time to explore Cornelius, with warm days perfect for sightseeing and cooler evenings perfect for a cozy retreat.

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

The chart illustrates September temperature patterns in Cornelius, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cornelius, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (45°F).

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

September Precipitation in Cornelius

In Cornelius in September, the precipitation amount is 134 mm (5.3 in) over the course of 9 days.

September Precipitation Trends in Cornelius

The chart displays monthly precipitation patterns in Cornelius, 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 Cornelius, September typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Cornelius

In Cornelius in September, humidity is 75%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket wrapping around you, making it feel more sweltering than it actually is, which can be quite uncomfortable for traveling.

September Average Humidity in Cornelius

This chart illustrates the average monthly humidity levels in Cornelius, 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 Cornelius is approximately 75%, 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 Cornelius

In Cornelius 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 Cornelius.

Maximum UV Index Levels in Cornelius for September

The chart shows the monthly maximum UV Index (UVI) for Cornelius 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 Cornelius typically reaches 9, which falls under the very high exposure category.

Data source: Cornelius 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 Cornelius Compares to Other Months

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

This table compares monthly weather conditions in Cornelius, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	91 mm (3.6 inches)	86%	moderate
February Weather	9°C (48°F)	118 mm (4.6 inches)	85%	high
March Weather	12°C (53°F)	86 mm (3.4 inches)	84%	very high
April Weather	16°C (62°F)	104 mm (4.1 inches)	82%	very high
May Weather	21°C (71°F)	118 mm (4.6 inches)	83%	very high
June Weather	25°C (77°F)	81 mm (3.2 inches)	82%	extreme
July Weather	27°C (81°F)	91 mm (3.6 inches)	80%	very high
August Weather	26°C (79°F)	96 mm (3.8 inches)	74%	very high
September Weather	23°C (74°F)	134 mm (5.3 inches)	75%	very high
October Weather	18°C (65°F)	102 mm (4.0 inches)	79%	very high
November Weather	10°C (51°F)	89 mm (3.5 inches)	87%	moderate
December Weather	8°C (46°F)	119 mm (4.7 inches)	87%	moderate