Houston weather in September
September in Houston: sweltering, soaked — a good time to visit.
#9 of 12 months in Houston · #480 of 604 destinations to visit in September · comfort 64/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Houston climate normals — September
| Daytime high | 32°C / 89°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 23°C / 74°F | |
| Feels like (high) | 36°C / 97°F | |
| Rainfall | 150 mm / 5.9 in | ⛈ soaked |
| Rainy days | 12 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 12.3 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 54 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Houston in September — FAQ
- Is September a good time to visit Houston?
- September in Houston: sweltering, soaked — a good time to visit. It ranks #9 of 12 months for Houston on SeasonMap's comfort score (64/100).
- What is the weather like in Houston in September?
- In September, Houston averages a daily high of 31.6°C and a low of 23.1°C, with about 150.2 mm of rain over roughly 12 rainy days.
- What is the air quality in Houston in September?
- Houston has a mean US Air Quality Index of about 54 in September.