You probably have to get in contact with an FAE.
Hello Keyao Sun,
You have the STM32F042F6P7 which can reach 105°C.
There are devices in other families (F4, L0, L4) designed to operate under 125°C as maximum ambient temperature.
So it depends on the features required in your application to select the ones more suitable for you.
I recommend you to use the selector from this page and fix the criteria you need (like max temp = 125°C).
If for example it is a requirement for you to use a TSSOP 20 package, you will have as choice STM32L011F4 and STM32L31F4.
The usage of STM32Cube will help you to easily migrate from one family to another as the APIs are almost the same.
PS: It is interesting to add a filter on temperature range in the MCU Fider tool, I will raise this request internally.