What happens if htc weather is uninstalled? Will it affect the stability of the mobile phone?

This will not happen, because the weather is just an application software, just like a program installed on a computer. You can delete it if you don't want to use it. That's all, it has no effect on the stability of the system. What affects the stability of mobile phones are those system programs, such as SMS programs, desktop programs and other basic programs. After deleting these programs, some functions of the mobile phone can't be used normally. I hope it helps you!