September Weather in Dallas, United States

Last updated: June 24, 2025

In September, the average temperature in Dallas, United States is a pleasant 23°C (74°F), with fluctuations ranging from a cool 10°C (50°F) to a warm 35°C (95°F). Expect around 112 mm (4.4 in) of precipitation over 9 days, contributing to an average humidity level of a crisp 82%.

September Temperature in Dallas

In September in Dallas, the average temperature is 23°C (74°F). Maximums can reach 35°C (95°F), while minimums can drop to as low as 10°C (50°F). Be prepared for warm days and cooler nights while enjoying all that Dallas has to offer!

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

The chart illustrates September temperature patterns in Dallas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dallas, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 10°C (50°F).

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

September Precipitation in Dallas

In Dallas in September, the total precipitation amount is 112 mm (4.4 in), occurring over a span of 9 days.

September Precipitation Trends in Dallas

The chart displays monthly precipitation patterns in Dallas, 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 Dallas, September typically receives around 112 mm (4.4 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 Dallas

In Dallas in September, humidity is 82%. With an average temperature of 23°C (74°F), this humidity feels like you are walking through a warm, damp blanket, making travel a bit uncomfortable and sticky as you navigate the air thick with moisture.

September Average Humidity in Dallas

This chart illustrates the average monthly humidity levels in Dallas, 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 Dallas is approximately 82%, 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 Dallas

In Dallas 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 Dallas.

Maximum UV Index Levels in Dallas for September

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

Data source: Dallas 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 Dallas Compares to Other Months

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

This table compares monthly weather conditions in Dallas, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	111 mm (4.4 inches)	86%	moderate
February Weather	10°C (51°F)	159 mm (6.3 inches)	84%	high
March Weather	13°C (56°F)	138 mm (5.4 inches)	83%	very high
April Weather	16°C (62°F)	134 mm (5.3 inches)	81%	very high
May Weather	21°C (71°F)	106 mm (4.2 inches)	81%	extreme
June Weather	24°C (76°F)	133 mm (5.3 inches)	81%	extreme
July Weather	26°C (79°F)	123 mm (4.9 inches)	83%	extreme
August Weather	25°C (78°F)	144 mm (5.7 inches)	81%	very high
September Weather	23°C (74°F)	112 mm (4.4 inches)	82%	very high
October Weather	18°C (65°F)	131 mm (5.1 inches)	78%	very high
November Weather	11°C (52°F)	86 mm (3.4 inches)	86%	high
December Weather	9°C (48°F)	137 mm (5.4 inches)	89%	moderate