Weather extremes in Austin: Records for hottest, coldest and wettest September

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AUSTIN (KXAN) — At KXAN, we track extreme weather in Austin.

In this story, we’ll take a look at the hottest, coldest, and wettest September days in recorded history.

For more weather fluctuations, Click here to see heat and cold records for Austinor Click here to see rain and snow records for Austin.

What is the warmest/coldest September on record in Austin?

To determine the hottest or coldest September on record, we use the “average temperature” for each month, combining the highs and lows recorded for each day. The average temperature in a typical September is 80.8 degrees.

September 2019 was the hottest September on record, with an average temperature of 88.0°C. On the other hand, September 1974 was the coldest on record, with an average temperature of 72.3 degrees Celsius.

What is the hottest September temperature ever in Austin?

The average high temperature on any given day in September is 91.4 degrees Celsius, but several days have been much hotter than that.

The 10 hottest days in September all come from just three years: 2000, 2005 and 2023. September 5, 2000 is the hottest September day on record in Austin, with a high temperature of 112 degrees.

What is the coldest September temperature ever recorded in Austin?

The average low temperature on any given day in September is 70.1°C, but several days have been much colder than that.

September 27, 1942 holds the record as the coldest September day ever in Austin, with a low of 41 degrees. September 30, 1924 is the only other day in September that the temperature reaches below 45 degrees.

What is the wettest September ever in Austin?

A typical September in Austin sees 3.45 inches in the rain gauge at Camp Mabry.

September 1921 ranked as the wettest on record, with precipitation totaling 20.78 inches, more than 6 times the overall average. It also ranks as the wettest month on record in Austin. September 2010 is the only September to receive more than 10 inches of rain.

What is the wettest September day ever in Austin?

September 9, 1921 holds the record as the wettest September day in Austin’s history, with 15 inches of rain falling in one day. It also ranks as the wettest day on record in Austin. September 7, 2010, is the only other day in September that receives more than 5 inches of rain.

Click here to see Austin weather records for other months.