Houston weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: October – April
What is the weather like in Houston in September?
In September, Houston is hot: daytime highs average 31 °C, and even at night it stays warm at around 22 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 124 mm in total. On about 20 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Houston.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 34 | 51 | 82 |
| Day | 33° | 31° | 27° |
| Night | 25° | 22° | 18° |
| Sun | 8 h | 6 h | 6 h |
| Rain days | 14 | 12 | 8 |
More details for September
- Daylight
- 12 h 23 min07:05 – 19:28
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 24 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 45 %on averageAll months
- Hot days
- 20 days30 °C or moreAll months
- Time zone
- UTC−5America/Chicago
How the score comes together
- Temperatureweight 50 %51 %
- Sunshineweight 20 %57 %
- Few rainy daysweight 30 %46 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Houston in September: quick answers
Is Houston hot in September?
Yes. In September, Houston is hot: daytime highs average 31 °C and nights stay around 22 °C. On about 20 days the thermometer climbs to 30 °C or more.
Does it rain much in Houston in September?
Rain is frequent, with about 12 rainy days and 124 mm in total.
Houston month by month
The whole year in HoustonAll destinations: USAWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences