September Weather in Cary, United States

Last updated: June 24, 2025

In September, the average temperature in Cary, United States reaches a pleasant 23°C (75°F). Expect variability, as temperatures can dip to a minimum of 9°C (48°F) and soar to a maximum of 35°C (96°F). Be prepared for some rain, as 140 mm (5.5 in) of precipitation can be expected over 10 days. With an average humidity of 79%, it’s a month that balances warmth and moisture beautifully.

September Temperature in Cary

In September in Cary, the average temperature is 23°C (75°F). Maximum temperatures can reach 35°C (96°F), while minimums can drop to as low as 9°C (48°F). This makes it an ideal time for travelers to enjoy a pleasant mix of warm days and cooler evenings in Cary.

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

The chart illustrates September temperature patterns in Cary, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cary, September typically has an average temperature of 23°C (75°F), with highs reaching up to 35°C (96°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Cary

In Cary in September, the total precipitation amount is 140 mm (5.5 in) spread over a period of 10 days.

September Precipitation Trends in Cary

The chart displays monthly precipitation patterns in Cary, 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 Cary, September typically receives around 140 mm (5.5 inches) of precipitation spread over approximately 10 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 Cary

In Cary in September humidity is 79%. With an average temperature of 23°C (75°F), this humidity feels like a warm, enveloping blanket that can make traveling a bit uncomfortable. The air is thick and heavy, often leading to a sticky sensation on your skin, which can sap your energy and enthusiasm for exploration. Staying hydrated and taking breaks in the shade becomes essential to enjoy your visit.

September Average Humidity in Cary

This chart illustrates the average monthly humidity levels in Cary, 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 Cary is approximately 79%, 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 Cary

In Cary 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 Cary.

Maximum UV Index Levels in Cary for September

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

Data source: Cary 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 Cary Compares to Other Months

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

This table compares monthly weather conditions in Cary, 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)	93 mm (3.6 inches)	85%	moderate
February Weather	9°C (49°F)	107 mm (4.2 inches)	82%	high
March Weather	12°C (53°F)	80 mm (3.2 inches)	81%	very high
April Weather	17°C (62°F)	114 mm (4.5 inches)	80%	very high
May Weather	22°C (71°F)	114 mm (4.5 inches)	81%	extreme
June Weather	25°C (76°F)	131 mm (5.2 inches)	81%	extreme
July Weather	27°C (81°F)	117 mm (4.6 inches)	81%	extreme
August Weather	26°C (79°F)	141 mm (5.6 inches)	80%	very high
September Weather	23°C (75°F)	140 mm (5.5 inches)	79%	very high
October Weather	18°C (66°F)	85 mm (3.4 inches)	80%	very high
November Weather	11°C (51°F)	83 mm (3.3 inches)	85%	moderate
December Weather	8°C (47°F)	107 mm (4.2 inches)	86%	moderate