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September Weather in Dallas, United States

Last updated: June 24, 2025

In Dallas, United States, the average temperature in September hovers around 23°C (74°F), perfect for enjoying outdoor activities. However, be prepared for fluctuations, as temperatures can dip to a cool 8°C (46°F) or soar up to a warm 35°C (95°F). During this month, expect around 130 mm (5.1 in) of precipitation across 9 days, and with an average humidity level of 75%, it's wise to plan accordingly. Enjoy your stay!

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 as low as 8°C (46°F). This makes Dallas an ideal destination for travelers seeking a pleasant and varied climate.

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 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec434853627076807874645046
Data source: Temperature data for Dallas 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 Dallas

In Dallas in September, the precipitation amount is 130 mm (5.1 in) over the course 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 130 mm (5.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9412594117120929811913010896126
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Dallas

In Dallas 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 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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109853
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.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)94 mm (3.7 inches)86%moderate
February Weather9°C (49°F)124 mm (4.9 inches)85%high
March Weather12°C (54°F)94 mm (3.7 inches)84%very high
April Weather16°C (62°F)117 mm (4.6 inches)82%very high
May Weather21°C (71°F)120 mm (4.7 inches)83%very high
June Weather25°C (77°F)92 mm (3.6 inches)82%extreme
July Weather27°C (80°F)98 mm (3.9 inches)80%extreme
August Weather26°C (78°F)119 mm (4.7 inches)74%very high
September Weather23°C (74°F)130 mm (5.1 inches)75%very high
October Weather18°C (65°F)107 mm (4.2 inches)79%very high
November Weather10°C (51°F)96 mm (3.8 inches)87%moderate
December Weather8°C (47°F)126 mm (5.0 inches)87%moderate

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