Weather in Austin in September 2025
Average weather
Average temperature in Austin in September
The temperature in September is +97°F on average, with a range between a maximum of +106°F during the day and a minimum of +68°F at night.
The average maximum temperature goes down 14% by the end of the month, compared with the beginning of the month, from +100°F to +95°F.
Is Austin warm or cold in September?
Austin is typically hot in September.
Maximum temperatures go down compared to the previous month from +97°F to +90°F. The minimum temperature also goes down from +75°F to +72°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
Take a look at how September is compared to other months in Austin:
Climate in Austin in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +97°F | +90°F | +82°F | ||||
| Min. temperature | ||||||
| +61°F | +46°F | +30°F | ||||
| Max. temperature | ||||||
| +109°F | +109°F | +97°F | ||||
| Rainfall | ||||||
| 54 mm | 82 mm | 98 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 63% | 67% | 69% | ||||
| Air pressure | ||||||
| 1013 HPa | 1014 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 11 | 10 | 12 | ||||
| Cloudy days | ||||||
| 6 | 5 | 7 | ||||
| Rainy days | ||||||
| 12 | 12 | 11 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September often has better weather than August. It’s getting colder in September. From +97°F in the day, the average maximum temperature lowers to +90°F. Prepare for more rain. Average rainfall goes from 54 mm to 82 mm. Humidity rises from 63% to 67%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 11 sunny days in August to 10 in September.
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 Austin is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Austin?
Climate Change Over the Years
The climate in Austin in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1979 (+76°F) and the highest in 2023 (+84°F). The driest year was 2011 with only 478 mm of rainfall, and the wettest year was 2019 with 2921 mm.
FAQ
Is September a good time to visit Austin?
Can you sunbathe in Austin in September?
Is Austin rainy in September?
Is it sunny in Austin in September?
Other cities in USA
Monthly weather in Austin
Source of the data
For this page, we’ve looked at the typical weather in Austin, 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.