Dallas, Texas weather in September

Averages from 2021–2025 (150 days of record).

Average high: 90°F
Average low: 71°F
Rainy days: ~7 per month
Total precipitation: 2.7 in
Warmest recorded: 106°F
Coldest recorded: 58°F

Expect September days in Dallas, Texas to top out around 90°F and cool to about 71°F overnight, with roughly 7 days of measurable rain across the month. In recent years September has ranged from 58°F to 106°F.

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Current Dallas, Texas forecast → · Historical data by Open-Meteo (ERA5).