Oops, it doesn't look like 'weather service can predict with any kind of accuracy what will happen in a day' is a national day..

Other days

Bubble Bath Day

One Day

Tell Ur Crush You Like Them Day

Polyamory Day

Emoji Day

Appreciate Yaself A Lil Extra Day

Book Day

Raise Awerness Of Zeus Day

Prescription Drug Take Back Day

Pick Me Day