The best time to visit Dallas – Fort Worth is between September and November, when the temperatures aren't overwhelmingly hot, the tourist traffic has died down and the Texas State Fair is in full swing. Keep in mind: The Cowboys football season can drive hotel prices up, especially in the Metroplex areas.
The weather in Dallas in September is hot. The average temperatures are between 22°C and 31°C. You can expect about 3 to 8 days of rain in Dallas during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
In Dallas, it does not rain all day in September. You can expect around 9 rainy days, with on average 2 inches / 51 mm of rain during the month. Another way of looking at the rain is the number of sunny days. For Dallas Texas, there are, on average 16 sunny days and 11 partly sunny days in September. That clearly shows that it is not raining all the time.
Over the course of September in Dallas, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 58 minutes, implying an average daily decrease of 1 minute, 59 seconds, and weekly decrease of 13 minutes, 54 seconds .