Houston weather in September
In September, Houston has an average high of 32 °C89 °F and an average low of 21 °C70 °F, with about 118 mm4.6 in of precipitation. It is the 4th warmest month of the year and ranks 5th for precipitation.
How September compares with other months
Compared with August, September is 2.8 °C5.1 °F cooler on average and drier by 7 mm0.3 in. Compared with October, September is 4.8 °C8.7 °F warmer on average and drier by 10 mm0.4 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 75% and the average cloud amount 44%.
Is September a good time to visit Houston?
September is not among the most comfortable months by our comfort score: it is hot (average high 32 °C89 °F), it is fairly wet (118 mm4.6 in) and it is humid (75%). The most comfortable months in Houston are February–April and November.
What to wear in September
For Houston in September, pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Houston | 3289 | 2170 | 1184.6 |
| Pasadena | 3086 | 2475 | 1736.8 |
| Beaumont | 3188 | 2271 | 1606.3 |
| College Station | 3290 | 2169 | 903.5 |
| Austin | 3290 | 2169 | 873.4 |
| Waco | 3290 | 2069 | 783.1 |
| Killeen | 3289 | 2068 | 813.2 |
| Tyler | 3289 | 1967 | 853.4 |
| Corpus Christi | 3289 | 2374 | 1275.0 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Corpus Christi.
Other months in Houston
- January16 °C61 °F / 5 °C41 °F
- February19 °C65 °F / 7 °C45 °F
- March23 °C73 °F / 11 °C52 °F
- April26 °C80 °F / 15 °C59 °F
- May31 °C87 °F / 19 °C67 °F
- June34 °C92 °F / 23 °C73 °F
- July34 °C93 °F / 24 °C75 °F
- August35 °C94 °F / 24 °C75 °F
- September32 °C89 °F / 21 °C70 °F
- October28 °C82 °F / 16 °C60 °F
- November22 °C72 °F / 10 °C51 °F
- December18 °C64 °F / 6 °C43 °F
Frequently asked questions
How warm is Houston in September?
In September the average high in Houston is 32 °C (89 °F) and the average low is 21 °C (70 °F).
Does it rain a lot in Houston in September?
On average about 118 mm (4.6 in) of precipitation falls in September; it ranks 5th of the 12 months.
Is September the warmest month in Houston?
No. The warmest month in Houston is August, with an average high of 35 °C (94 °F). The coldest month is January, with an average low of 5 °C (41 °F).
How long is the day in Houston in September?
In the middle of September the day in Houston lasts about 12.3 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Houston in September?
The average relative humidity in September is about 75%. Combined with warm days, it can feel muggy.
How cloudy is Houston in September?
On average about 44% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.