It is really sunny today. What punctuation should be added?

You should add an exclamation point "!" ,

For example, when expressing strong feelings, I am really happy! No matter whether it is joy, anger, sadness or joy, as long as there are strong feelings, exclamation marks will be used at the end of the sentence.

For example, when expressing commands and prayers, please! Don't leave this house!

Then there are sighs, such as: alas! Ah! Ah! Finally, there are honorifics, such as: Congratulations! Congratulations! "Congratulations" is an honorific, so it is followed by an exclamation point.

Therefore, according to analysis, this sentence has a strong emotional color. This sentence is an exclamatory sentence, so you should add an exclamation point.