Weather in Houston in September 2025
Average weather
Average temperature in Houston in September
The temperature in September is +35°C on average, with a range between a maximum of +40°C during the day and a minimum of +22°C at night.
The average maximum temperature goes down 17% by the end of the month, compared with the beginning of the month, from +37°C to +34°C.
Is Houston warm or cold in September?
Houston is typically hot in September.
Maximum temperatures go down compared to the previous month from +34°C to +32°C. The minimum temperature also goes down from +24°C to +22°C.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
September is one of the warmest months in Houston, here is the comparison with other months:
Climate in Houston in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +34°C | +32°C | +28°C | ||||
| Min. temperature | ||||||
| +16°C | +10°C | 0°C | ||||
| Max. temperature | ||||||
| +42°C | +42°C | +35°C | ||||
| Rainfall | ||||||
| 102 mm | 116 mm | 112 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Humidity | ||||||
| 73% | 73% | 71% | ||||
| Air pressure | ||||||
| 1014 HPa | 1014 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 4 | 7 | 11 | ||||
| Cloudy days | ||||||
| 5 | 5 | 7 | ||||
| Rainy days | ||||||
| 13 | 12 | 10 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September often has better weather than August. It’s getting colder in September. From +34°C in the day, the average maximum temperature lowers to +32°C. Prepare for more rain. Average rainfall goes from 102 mm to 116 mm. Humidity levels don’t change as the month goes on, averaging around 73%. The average wind speed doesn’t change much during September, staying around 2 m/s. The good news is there are likely to be more sunny days in September, from 4 to 7.
October brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Houston is gradually increasing during September, going from 2 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Houston?
Climate Change over Years
The climate in Houston in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+24°C) and the highest in 2012 (+28°C). The driest year was 2011 with only 709 mm of rainfall, and the wettest year was 2021 with 2058 mm.
FAQ
Is September a good time to visit Houston?
Can you sunbathe in Houston in September?
Is Houston rainy in September?
Is it sunny in Houston in September?
Other cities in USA
Monthly weather in Houston
Source of the data
For this page, we’ve looked at the typical weather in Houston, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.