Weather in Dallas in September 2025
Average weather
Average temperature in Dallas in September
Going from a maximum of +43°C during the day to a minimum of +21°C during the night, the temperature in September averages around +35°C.
The average maximum temperature goes down 9% by the end of the month, compared with the beginning of the month, from +36°C to +34°C.
Is Dallas warm or cold in September?
Dallas is typically hot in September.
Maximum temperatures go down compared to the previous month from +36°C to +32°C. The minimum temperature also goes down from +25°C to +21°C.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
Take a look at how September is compared to other months in Dallas:
Climate in Dallas in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +36°C | +32°C | +26°C | ||||
| Min. temperature | ||||||
| +14°C | +6°C | -2°C | ||||
| Max. temperature | ||||||
| +43°C | +43°C | +36°C | ||||
| Rainfall | ||||||
| 54 mm | 63 mm | 98 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 57% | 61% | 63% | ||||
| Air pressure | ||||||
| 1014 HPa | 1014 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 10 | 11 | 11 | ||||
| Cloudy days | ||||||
| 10 | 8 | 9 | ||||
| Rainy days | ||||||
| 7 | 8 | 8 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September often has better weather than August. It’s getting colder in September. From +36°C in the day, the average maximum temperature lowers to +32°C. Prepare for more rain. Average rainfall goes from 54 mm to 63 mm. Humidity rises from 57% to 61%. The average wind speed doesn’t change much during September, staying around 3 m/s. The good news is there are likely to be more sunny days in September, from 10 to 11.
October brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Dallas is gradually increasing during September, going from 4 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Dallas?
Climate Change over Years
The climate in Dallas in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+23°C) and the highest in 2012 (+27°C). The driest year was 2005 with only 460 mm of rainfall, and the wettest year was 2020 with 1551 mm.
FAQ
Is September a good time to visit Dallas?
Can you sunbathe in Dallas in September?
Is Dallas rainy in September?
Is it sunny in Dallas in September?
Other cities in USA
Monthly weather in Dallas
Source of the data
For this page, we’ve looked at the typical weather in Dallas, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.