No matter what the weather is like tomorrow, we will go skating. () What do you choose? why

This is a complex sentence, the first half of which is a true conditional sentence, which is a hypothesis about the future situation. It is called a real conditional sentence because there are many possibilities for tomorrow's weather, and this structure is fixed, as follows:

When making assumptions about the future, the main clause uses the simple present tense (is like) and the subordinate clause uses the simple future tense (will go skating).

Specific grammar can query real conditional sentences.

I hope this helps.