Houston, Texas weather in September

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

Average high: 89°F
Average low: 73°F
Rainy days: ~11 per month
Total precipitation: 4.8 in
Warmest recorded: 103°F
Coldest recorded: 58°F

Expect September days in Houston, Texas to top out around 89°F and cool to about 73°F overnight, with roughly 11 days of measurable rain across the month. In recent years September has ranged from 58°F to 103°F.

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