The temperatures in Semmering in September are quite cold with temperatures between 9°C and 17°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Semmering. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Semmering in September 2026.
If you’re planning to visit Semmering in the near future, we highly recommend that you review the 14 day weather forecast for Semmering before you arrive.
Temperatures
17° / 9°
Rainy Days
10
Snowy Days
0
Dry Days
20
Rainfall
118
mm
Sun Hours
5.8
Hrs
