Dallas Weather in September
United States · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Dallas sees average temperatures ranging from a low of 21.5°C (70.7°F) to a high of 31.7°C (89.1°F), with a mean of 26.3°C (79.3°F). Compared to the annual average of 19.8°C (67.6°F), this month is 6.5°C warmer than the yearly norm. Precipitation averages 72.8mm, making it approximately 45.0mm drier than the monthly average of 117.0mm. This is the driest month of the year, with just 72.8mm of precipitation. The city receives an average of 10.6 hours of sunshine per day during September, with relative humidity averaging 60.2%. Wind speeds reach an average maximum of 18.0 km/h. For travelers, this month offers a temperature experience in Dallas, with drier-than-average conditions compared to the rest of the year.
Dallas's climate is characterized by hot summers and mild winters, with occasional severe weather. I tracked the data and found that the city experiences some of the most dramatic temperature swings in Texas. The best time for visiting is October to April, when temperatures are pleasant and the risk of severe weather is lower. Spring and autumn are particularly comfortable.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 30.7°C (87.3°F) | 26.3°C (79.3°F) | 21.1°C (70.0°F) |
| Rainfall | 87.1mm | 72.8mm | 126.9mm |
| Sunshine | 12.1 hrs | 10.6 hrs | 9.6 hrs |
| Humidity | 55.5% | 60.2% | 57.3% |
| Wind | 19.5 km/h | 18.0 km/h | 21.7 km/h |
| Rainy Days | 11.4 | 12.2 | 8.0 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Dallas in September, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Dallas in September?
The average temperature in Dallas during September ranges from 21.5°C (70.7°F) to 31.7°C (89.1°F), with a mean of 26.3°C (79.3°F).
How much does it rain in Dallas in September?
Dallas receives an average of 72.8mm of precipitation in September, spread across approximately 12.2 rainy days. This is the driest month of the year.
What should I pack for Dallas in September?
Based on September weather data, pack lightweight, breathable clothing, sunscreen, and a hat.
Is September a good time to visit Dallas?
September is a good time to visit Dallas, with comfortable temperatures and manageable rainfall.
Other Months for Dallas
Cities with Similar September Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 32.78°, -96.81°. Timezone: America/Chicago. Last updated: 2026-07-30.