Weather in Houston in September
September in Houston is warm with average temperatures around 26.8°C (80.2°F). Expect significant rainfall with 118mm across approximately 13 days.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
32.0°C
89.6°F
Low
21.5°C
70.7°F
Precipitation
118 mm
4.6 inches
~13 rainy days
Conditions
Humidity
75%
Comparison to Adjacent Months
September is 2.8°C cooler than August.
September is 4.9°C warmer than October.