Dallas weather in September
September in Dallas: sweltering, a little rain — a great time to visit.
#6 of 12 months in Dallas · #364 of 604 destinations to visit in September · comfort 76/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Dallas climate normals — September
| Daytime high | 33°C / 91°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 23°C / 73°F | |
| Feels like (high) | 35°C / 95°F | |
| Rainfall | 39 mm / 1.6 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 55% | 🍃 comfortable |
| Dew point | 17°C / 63°F | |
| Sunshine | 10.4 h/day | |
| Daylight | 12.4 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Dallas in September — FAQ
- Is September a good time to visit Dallas?
- September in Dallas: sweltering, a little rain — a great time to visit. It ranks #6 of 12 months for Dallas on SeasonMap's comfort score (76/100).
- What is the weather like in Dallas in September?
- In September, Dallas averages a daily high of 32.5°C and a low of 22.8°C, with about 39.4 mm of rain over roughly 5.8 rainy days.
- What is the air quality in Dallas in September?
- Dallas has a mean US Air Quality Index of about 51 in September.