September weather forecast and climate
Austin, TX

The beautiful Lady Bird Lake passing through the city skyscrapers of Austin city in Texas, USA, in a beautiful sunrise panorama
The beautiful Lady Bird Lake passing through the city skyscrapers of Austin city in Texas, USA, in a beautiful sunrise panorama
September is an extension of the hot summer in Austin, with daily high temperatures mostly above 90°F (32.2°C). The average temperatures are in the range of 69°F (20.6°C) to 91°F (32.8°C) and gradually decrease by mid-September, signaling the start of the autumn season. A few nights drop to 60°F (15.6°C), but the low temperatures seldom touch 50°F (10°C).
The days are mostly bright and sunny, and the sunlight lasts for more than 12 hours. The few clouds bring rain to the tune of 3" (76.2mm). Expect mostly warm days in September with a few rain showers.

What is the average temperature in September in Austin?

The average high-temperature, in September, in Austin, is 90.5°F (32.5°C), while the average low-temperature is 69.4°F (20.8°C).
Average temperature in September - Austin, TX
  • Average high temperature in September: 32.5°C

The warmest month (with the highest average high temperature) is August (36.1°C).
The month with the lowest average high temperature is January (16.4°C).

  • Average low temperature in September: 20.8°C

The month with the highest average low temperature is August (23.7°C).
The coldest month (with the lowest average low temperature) is January (5.3°C).

Average humidity in September - Austin, TX
  • Average humidity in September: 68.4%

The month with the highest relative humidity is May (71.4%).
The month with the lowest relative humidity is August (63.8%).

Average rainfall in September - Austin, TX
  • Average rainfall in September: 75.9mm

The wettest month (with the highest rainfall) is May (112.8mm).
The driest month (with the lowest rainfall) is July (47.8mm).

Average rainfall days in September - Austin, TX
  • Average rainfall days in September: 6.7 days

The month with the highest number of rainy days is March (9.2 days).
The month with the lowest number of rainy days is August (4.9 days).

Average snowfall in September - Austin, TX
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (10.2mm).
Months with the lowest snowfall are March, April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in September - Austin, TX
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.3 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in September / Average sunshine in September - Austin, TX
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.1h).
The month with shortest days is December (Average daylight: 10.2h).

  • Average sunshine in September: 7.8h

The month with most sunshine is July (Average sunshine: 10.2h).
The month with least sunshine is December (Average sunshine: 5h).

Average UV index in September - Austin, TX
  • Average UV index in September: 9

Months with the highest UV index are June and July (UV index 11).
Months with the lowest UV index are January and December (UV index 4).

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