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September Weather in Dallas, United States

Last updated: June 24, 2025

In September, the average temperature in Dallas, United States hovers around 17°C (63°F), with a range that can dip as low as 4°C (40°F) and soar up to 36°C (97°F). Expect about 60 mm (2.3 in) of precipitation spread over 7 days, accompanied by an average humidity of 71%. Stay prepared for these diverse conditions!

September Temperature in Dallas

In September in Dallas, the average temperature is 17°C (63°F). Maximum temperatures can reach 36°C (97°F), while the minimum can drop as low as 4°C (40°F). This range makes it essential for travelers to pack both light clothing for the warm days and warmer layers for the cooler nights.

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 17°C (63°F), with highs reaching up to 36°C (97°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec414145505763686963534641
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 total precipitation amount is 60 mm (2.3 in) spread over a duration of 7 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 60 mm (2.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec1651661331135444466089147186
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 71%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet a bit sticky, so travelers should stay hydrated and take breaks in the shade.

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 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23579101097532
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 Weather5°C (42°F)165 mm (6.5 inches)85%low
February Weather5°C (41°F)166 mm (6.5 inches)84%moderate
March Weather7°C (45°F)133 mm (5.2 inches)85%moderate
April Weather10°C (51°F)112 mm (4.4 inches)83%high
May Weather14°C (57°F)54 mm (2.1 inches)83%very high
June Weather17°C (63°F)44 mm (1.7 inches)83%very high
July Weather20°C (68°F)4 mm (0.2 inches)82%very high
August Weather21°C (69°F)5 mm (0.2 inches)74%very high
September Weather17°C (63°F)60 mm (2.3 inches)71%high
October Weather11°C (53°F)89 mm (3.5 inches)81%moderate
November Weather8°C (46°F)147 mm (5.8 inches)87%moderate
December Weather5°C (41°F)186 mm (7.3 inches)87%low

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