You can put the question like that, certainly, Tuongvan, or you can leave out the
at, and say
Is it raining your end? The remark would be most usual if you are on opposite ends of something; if you were on the telephone, for instance.
I'm not so happy about the position of
sadly in the first sentence.
To rain sadly is quite poetic language and I'm not sure it's what you mean. If you mean that you are sad that it's raining, say
Currently it is raining where I live, sadly. The two adverbs ending
-ly are clumsy in the same sentence, and need separating. I'd prefer
Sadly it's raining now where I live - that suggests mildly that you aren't there at the time, which makes the
at your end a bit strange, so I'd say
sadly it's raining here now, if that is what you mean.