Austria: September one of the 20 warmest on record

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More precipitation—up four percent—and less sunshine—down six percent—yet this year’s September was one of the 20 warmest in recorded history, Geosphere Austria reported on Wednesday. Incidentally, there were significant regional differences. Especially around September 20 and 21, temperatures exceeded 30 degrees Celsius in some regions. The highest temperature was recorded by the Innsbruck University weather station on September 20, at 32.4 degrees Celsius.

It was not until the end of the month that temperatures were roughly in line with the average for September in the recent past (climate period 1991-2020) or slightly below.

Around 90 percent of all Septembers cooler than 2025

“Viewed over the entire month, September 2025 was significantly too warm, with temperatures in the lowlands of Austria 1.4 degrees and in the mountains 1.8 degrees above the average for the climate period 1991 to 2020,” said climatologist Alexander Orlik. This puts it in 18th place in the series of warmest Septembers in 259 years of measurement history and in 19th place in the 175-year mountain measurement series. Around 90 percent of all Septembers were more remarkable than September 2025.

The number of summer days (at least 25 degrees Celsius) in the previous month was well above average and well below the records: There were twelve summer days on the Hohe Warte last month, compared to an average of six in September (1991-2020). The record here is 21 summer days in 2023.

Variable precipitation distribution

In the Austria-wide evaluation, precipitation in September 2025 was four percent above the long-term average. There were significant regional variations: for example, it was significantly too wet in parts of the Waldviertel and Weinviertel regions, with 50 to 100 percent above average. It was significantly too dry around Kufstein and Kitzbühel, across most of Upper Austria and into the western Mostviertel region, with a decrease of 35 to 55 percent.

The amount of sunshine was mainly in line with the long-term average (minus six percent). In most parts of the country, deviations from the climate average of minus eight to plus eight percent were recorded. Only in Vorarlberg, the Tyrolean Oberland, and in parts of East Tyrol, Upper Carinthia, Eastern Styria, and the southern half of Burgenland were there larger deficits with deviations of up to almost a third.

  • source: APA/picture: pixabay.com
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