How should I reply when foreigners say the weather is fine?

Glad to answer your question,

Your question is.

Foreigners say the weather is fine,

How should you reply?

This is actually a topic for foreigners to chat with.

Just like people in China meet and say, Have you eaten?

So you can say

Ah, indeed, it's a beautiful day today.

Of course, you can easily say,

At this time,

What should the weather be like in your country?

The temperature or something,

So that both sides can have something to say.