Dallas Weather in September

Hot weather continues into September at Dallas, Texas. This month is also slightly rainier and less sunny than previous ones.

This page gives detailed information on the typical September temperature, precipitation, sun, humidity, wind and storms for Dallas. The temperature, precipitation and wind speed numbers here are historical averages based on climate data gathered at the Dallas Love Field Airport, located a few miles from downtown Dallas. The rest of the measurements are averages from the nearby Dallas - Fort Worth International Airport.

Temperature Weather iconTemperature

90 °F September average high 32 °C
70 °F September average low 21 °C
17 days 90 °F max. or more (32 °C)
14 days 70 °F min. or less (21 °C)

Nearly every day in September warms to over 80 degrees Fahrenheit (27 degrees Celsius) in Dallas. The city averages one or two days this month when the thermometer reaches into the 100s °F (over 38 °C).

The thermometer dips to 60 °F (16 °C) or below on an average of 4 nights. Most years, September does not cool down to 50 °F (10 °C).

Rainy Weather iconRain

3.1 in total precipitation 79 mm
6 days of rain

Half the time, Dallas receives 1.2 to 3.7 inches (29 to 94 mm) of rainfall in September. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

67 % sunshine
13 days clear skies

The sun's rays reach the ground in Dallas during 67 percent of daylight hours on average in September, for a total of 249 hours in the month. Typically on 13 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in September at Dallas lasts for 12 hours and 21 minutes a day on average. The longest day of the month is the 1st with 12 hours and 50 minutes of daylight. By the end of the month, the days have shortened to 11:52 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

67 % September average humidity

The relative humidity in Dallas during September usually peaks at 85 percent in the morning then drops to 48 percent by mid afternoon.

Local Time12 am3 am6 am9 am12 pm3 pm6 pm9 pm
Humidity % 74 80 85 72 55 48 52 66

Windy Weather iconWind

8.0 mph September wind speed average 12.9 kph

September is the least windy month for Dallas.

Stormy Weather iconStorms

2 days rainfall of 0.5 inches (13 mm) or more
4 days with thunderstorms in September
4 % chance a named storm approaches

There's a 4 percent probability that a named tropical storm will approach within 100 miles (165 km) of Dallas during September, and a 2 percent chance of a category 1 or 2 hurricane. Major hurricanes are unlikely here.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals. The named storm probabilities come from the Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division.

Dallas Weather
Back to Top